Compare | Image | Name | Manufacturer | Pricing(USD) | Quantity | Weight(Kg) | Size(LxWxH) | Part Status | Series | Mount | Mounting Type | Packaging | Size / Dimension | Moisture Sensitivity Level (MSL) | Max Operating Temperature | Min Operating Temperature | Height Seated (Max) | RoHS Status | Published | Datasheet | Package / Case | Height | Color | Lead Free | Shape | Depth | Number of Terminations | Factory Lead Time | Number of Pins | Pbfree Code | Additional Feature | Radiation Hardening | HTS Code | Packing Method | Number of Functions | Power Rating | Max Current Rating | Lens Color | Base Part Number | Number of Elements | Subcategory | Supplier Device Package | Forward Current | Overall Height | Optoelectronic Device Type | Viewing Angle | Lens Style | Number of LEDs | Configuration | Reverse Voltage | Forward Voltage-Max | Voltage - Forward (Vf) (Typ) | Reverse Voltage (DC) | Illumination Color | Luminous Flux | Thermal Resistance of Package | Lumens/Watt @ Current - Test | Temperature - Test | Flux @ Current/Temperature - Test | Wavelength | Dominant Wavelength | Current - Test | Current - Max | T-code | Luminous Intensity-Min |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
XPEGRN-L1-0000-00F02 | Cree Inc. |
Min: 1 Mult: 1 |
0 | 0x0x0 | download | XLamp® XP-E | Surface Mount | Surface Mount | Tape & Reel (TR) | 0.136Lx0.136W 3.45mmx3.45mm | 1 (Unlimited) | 0.084 2.13mm | RoHS Compliant | /files/creeinc-xpeeprl1000000901-datasheets-1080.pdf | 1414 (3535 Metric) | Green | 10 Weeks | 8541.40.20.00 | 1A | SINGLE COLOR LED | 130° | 3.2V | 15°C/W | 109 lm/W | 25°C | 126lm 122lm~130lm | 525nm 520nm ~ 530nm | 350mA | |||||||||||||||||||||||||||||||||||||
XPERED-L1-R250-00502 | Cree Inc. |
Min: 1 Mult: 1 |
0 | 0x0x0 | download | XLamp® XP-E | Surface Mount | Surface Mount | Tape & Reel (TR) | 0.136Lx0.136W 3.45mmx3.45mm | 1 (Unlimited) | 150°C | 0.084 2.13mm | RoHS Compliant | /files/creeinc-xpeeprl1000000901-datasheets-1080.pdf | 1414 (3535 Metric) | Red | 3.5W | 700mA | Clear | XPE | 350mA | 130° | 2.1V | 56.8 lm | 8°C/W | 80 lm/W | 25°C | 59lm 57lm~62lm | 623nm 620nm ~ 625nm | |||||||||||||||||||||||||||||||||||
XPEAMB-L1-R250-00701 | Cree Inc. |
Min: 1 Mult: 1 |
0 | 0x0x0 | download | XLamp® XP-E | Surface Mount | Surface Mount | Tape & Reel (TR) | 0.136Lx0.136W 3.45mmx3.45mm | 1 (Unlimited) | 150°C | 0.084 2.13mm | RoHS Compliant | /files/creeinc-xpeeprl1000000901-datasheets-1080.pdf | 1414 (3535 Metric) | Amber | Lead Free | 2 | 3.5W | 500mA | Clear | XPEAMB-L1-R250 | 350mA | 130° | Dome | 1 | 2.1V | Orange | 67.2 lm | 10°C/W | 97 lm/W | 25°C | 71lm 67lm~74lm | 590nm 585nm ~ 595nm | 595 nm | |||||||||||||||||||||||||||||
XPCRDO-L1-R250-00201 | Cree Inc. |
Min: 1 Mult: 1 |
0 | 0x0x0 | download | XLamp® XP-C | Surface Mount | Surface Mount | Tape & Reel (TR) | 0.136Lx0.136W 3.45mmx3.45mm | 1 (Unlimited) | 0.084 2.13mm | RoHS Compliant | /files/creeinc-xpcrdol1000000601-datasheets-0452.pdf | 1414 (3535 Metric) | Red-Orange | 3 Weeks | 350mA | XPC | 125° | 2.2V | 39.8 lm | 10°C/W | 56 lm/W | 25°C | 43lm 40lm~46lm | 615nm 610nm ~ 620nm | ||||||||||||||||||||||||||||||||||||||
XPEAMB-L1-R250-00402 | Cree Inc. |
Min: 1 Mult: 1 |
0 | 0x0x0 | download | XLamp® XP-E | Surface Mount | Surface Mount | Tape & Reel (TR) | 0.136Lx0.136W 3.45mmx3.45mm | 1 (Unlimited) | 150°C | 0.084 2.13mm | RoHS Compliant | /files/creeinc-xpeeprl1000000901-datasheets-1080.pdf | 1414 (3535 Metric) | Amber | 3 Weeks | 3.5W | 500mA | Clear | XPEAMB-L1-R250 | 350mA | 130° | 2.1V | Orange | 51.7 lm | 10°C/W | 73 lm/W | 25°C | 54lm 52lm~57lm | 588nm 585nm ~ 590nm | |||||||||||||||||||||||||||||||||
XTEARY-02-0000-000000N03 | Cree Inc. |
Min: 1 Mult: 1 |
0 | 0x0x0 | download | XLamp® XT-E | Surface Mount | Surface Mount | Tape & Reel (TR) | 0.136Lx0.136W 3.45mmx3.45mm | 1 (Unlimited) | 85°C | 0.100 2.54mm | RoHS Compliant | /files/creeinc-xteary000000000000k01-datasheets-5178.pdf | 1414 (3535 Metric) | Blue | 2 | 575mW | 1.5A | Clear | XTEARY | 350mA | 140° | Dome | 1 | 2.85V | 5°C/W | 85°C | 563mW 550mW~575mW | 460nm 455nm ~ 465nm | 465 nm | |||||||||||||||||||||||||||||||||
XRCAMB-L1-0000-00M01 | Cree Inc. |
Min: 1 Mult: 1 |
0 | 0x0x0 | download | XLamp® XR-C | Surface Mount | Surface Mount | Tape & Reel (TR) | 0.354Lx0.276W 9.00mmx7.00mm | 4 (72 Hours) | 150°C | 0.181 4.60mm | RoHS Compliant | /files/creeinc-xrcredl1000000j01-datasheets-8454.pdf | 3529 (9073 Metric) | Amber | Lead Free | ROUND | 7mm | 2 | 6 Weeks | 2 | No | 1 | 2W | 350mA | XRC | 1 | Visible LEDs | 350mA | 4.4mm | SINGLE COLOR LED | 90° | Diffused, Dome | SINGLE | 5V | 2.2V | Orange | 39.8 lm | 15°C/W | 56 lm/W | 25°C | 43lm 40lm~46lm | 590nm 585nm ~ 595nm | 595 nm | 90 cd | ||||||||||||||||||
XPEROY-L1-R250-00A01 | Cree Inc. |
Min: 1 Mult: 1 |
0 | 0x0x0 | download | XLamp® XP-E | Surface Mount | Surface Mount | Tape & Reel (TR) | 0.136Lx0.136W 3.45mmx3.45mm | 1 (Unlimited) | 150°C | 0.084 2.13mm | RoHS Compliant | /files/creeinc-xpeeprl1000000901-datasheets-1080.pdf | 1414 (3535 Metric) | Blue | 3.5W | 1A | Clear | XPE | 350mA | 130° | 3.1V | 9°C/W | 25°C | 463mW 450mW~475mW | 458nm 450nm ~ 465nm | 1A | ||||||||||||||||||||||||||||||||||||
XTEARY-02-0000-000000N07 | Cree Inc. |
Min: 1 Mult: 1 |
0 | 0x0x0 | download | XLamp® XT-E | Surface Mount | Surface Mount | Tape & Reel (TR) | 0.136Lx0.136W 3.45mmx3.45mm | 1 (Unlimited) | 85°C | 0.100 2.54mm | RoHS Compliant | /files/creeinc-xteary000000000000k01-datasheets-5178.pdf | 1414 (3535 Metric) | Blue | 2 | 575mW | 1.5A | Clear | XTEARY | 350mA | 140° | Dome | 1 | 2.85V | 5°C/W | 85°C | 563mW 550mW~575mW | 455nm 453nm ~ 458nm | 457.5 nm | |||||||||||||||||||||||||||||||||
XPERDO-L1-R250-00801 | Cree Inc. |
Min: 1 Mult: 1 |
0 | 0x0x0 | download | XLamp® XP-E | Surface Mount | Surface Mount | Tape & Reel (TR) | 0.136Lx0.136W 3.45mmx3.45mm | 1 (Unlimited) | 150°C | 0.084 2.13mm | RoHS Compliant | /files/creeinc-xpeeprl1000000901-datasheets-1080.pdf | 1414 (3535 Metric) | Red-Orange | 3.5W | 700mA | Clear | XPE | 350mA | 130° | 2.1V | Orange, Red | 73.9 lm | 8°C/W | 105 lm/W | 25°C | 77lm 74lm~81lm | 615nm 610nm ~ 620nm | ||||||||||||||||||||||||||||||||||
XPEFAR-L1-R250-00601 | Cree Inc. |
Min: 1 Mult: 1 |
0 | 0x0x0 | download | XLamp® XP-E | Surface Mount | Surface Mount | Tape & Reel (TR) | 0.136Lx0.136W 3.45mmx3.45mm | 1 (Unlimited) | 0.084 2.13mm | RoHS Compliant | /files/creeinc-xpeeprl1000000901-datasheets-1080.pdf | 1414 (3535 Metric) | Red | Lead Free | 1A | 130° | 1.9V | 8°C/W | 25°C | 230mW 210mW~250mW | 730nm 720nm ~ 740nm | 350mA | ||||||||||||||||||||||||||||||||||||||||
XPEBLU-L1-R250-00Z05 | Cree Inc. |
Min: 1 Mult: 1 |
0 | 0x0x0 | download | XLamp® XP-E | Surface Mount | Surface Mount | Tape & Reel (TR) | 0.136Lx0.136W 3.45mmx3.45mm | 1 (Unlimited) | 150°C | 0.084 2.13mm | RoHS Compliant | /files/cree-xpeblul1r25000z05-datasheets-3412.pdf | 1414 (3535 Metric) | Blue | 3.5W | 1A | Clear | XPEBLU | 350mA | 130° | 3.1V | 35.2 lm | 9°C/W | 35 lm/W | 25°C | 38lm 35lm~40lm | 475nm 470nm ~ 480nm | |||||||||||||||||||||||||||||||||||
XTEARY-02-0000-000000N05 | Cree Inc. |
Min: 1 Mult: 1 |
0 | 0x0x0 | download | XLamp® XT-E | Surface Mount | Surface Mount | Tape & Reel (TR) | 0.136Lx0.136W 3.45mmx3.45mm | 1 (Unlimited) | 85°C | 0.100 2.54mm | RoHS Compliant | /files/creeinc-xteary000000000000k01-datasheets-5178.pdf | 1414 (3535 Metric) | Blue | 1.5A | XTEARY | 350mA | SINGLE COLOR LED | 140° | 2.85V | 5°C/W | 563mW 550mW~575mW | 458nm 455nm ~ 460nm | 1.5A | ||||||||||||||||||||||||||||||||||||||
XPEGRN-L1-0000-00E03 | Cree Inc. |
Min: 1 Mult: 1 |
0 | 0x0x0 | download | XLamp® XP-E | Surface Mount | Surface Mount | Tape & Reel (TR) | 0.136Lx0.136W 3.45mmx3.45mm | 1 (Unlimited) | 150°C | 0.084 2.13mm | RoHS Compliant | /files/creeinc-xpeeprl1000000901-datasheets-1080.pdf | 1414 (3535 Metric) | Green | 10 Weeks | 8541.40.20.00 | 3.5W | 1A | Clear | XPEGRN | 350mA | SINGLE COLOR LED | 130° | 3.3V | 114 lm | 15°C/W | 102 lm/W | 25°C | 118lm 114lm~122lm | 530nm 525nm ~ 535nm | ||||||||||||||||||||||||||||||||
XPEGRN-L1-0000-00E02 | Cree Inc. |
Min: 1 Mult: 1 |
0 | 0x0x0 | download | XLamp® XP-E | Surface Mount | Surface Mount | Tape & Reel (TR) | 0.136Lx0.136W 3.45mmx3.45mm | 1 (Unlimited) | 150°C | 0.084 2.13mm | RoHS Compliant | /files/creeinc-xpeeprl1000000901-datasheets-1080.pdf | 1414 (3535 Metric) | Green | 10 Weeks | 8541.40.20.00 | 3.5W | 1A | Clear | XPEGRN | 350mA | SINGLE COLOR LED | 130° | 3.3V | 114 lm | 15°C/W | 102 lm/W | 25°C | 118lm 114lm~122lm | 525nm 520nm ~ 530nm | ||||||||||||||||||||||||||||||||
XTEARY-00-0000-000000Q02 | Cree Inc. |
Min: 1 Mult: 1 |
0 | 0x0x0 | download | XLamp® XT-E | Surface Mount | Surface Mount | Tape & Reel (TR) | 0.136Lx0.136W 3.45mmx3.45mm | 1 (Unlimited) | 85°C | 0.100 2.54mm | RoHS Compliant | /files/creeinc-xteary000000000000k01-datasheets-5178.pdf | 1414 (3535 Metric) | Blue | 3.45mm | 6 Weeks | 2 | 1.5A | Clear | XTEARY | 1 | Visible LEDs | 350mA | SINGLE COLOR LED | 140° | 5V | 3.4V | 2.85V | 5°C/W | 613mW 600mW~625mW | 455nm 450nm ~ 460nm | 460 nm | 1.5A | |||||||||||||||||||||||||||||
XPEAMB-L1-0000-00803 | Cree Inc. |
Min: 1 Mult: 1 |
0 | 0x0x0 | download | XLamp® XP-E | Surface Mount | Surface Mount | Tape & Reel (TR) | 0.136Lx0.136W 3.45mmx3.45mm | 1 (Unlimited) | 150°C | 0.084 2.13mm | RoHS Compliant | /files/creeinc-xpeeprl1000000901-datasheets-1080.pdf | 1414 (3535 Metric) | 2mm | Amber | 10 Weeks | 2 | 3.5W | 500mA | Clear | 350mA | SINGLE COLOR LED | 130° | Dome | 2.1V | 5V | Orange | 73.9 lm | 10°C/W | 105 lm/W | 25°C | 77lm 74lm~81lm | 593nm 590nm ~ 595nm | |||||||||||||||||||||||||||||
ELSH-F81G1-0LPNM-CG2G3 | Everlight Electronics |
Min: 1 Mult: 1 |
0 | 0x0x0 | download | SHUEN | Surface Mount | Surface Mount | Tape & Reel (TR) | 0.120Lx0.177W 3.05mmx4.50mm | 1 (Unlimited) | 100°C | -40°C | 0.085 2.15mm | ROHS3 Compliant | 2010 | /files/everlightelectronicscoltd-elshf81g10lpnmcg1g2-datasheets-7115.pdf | 1218 (3246 Metric) | Green | ROUND | 2 | 12 Weeks | 3 | yes | No | TAPE AND REEL 7" | 1 | 1W | 400mA | Clear | 350mA | 2mm | SINGLE COLOR LED | 120° | Circular | 1 | SINGLE WITH BUILT-IN ZENER DIODE | 3.25V | 80 lm | 10°C/W | 75 lm/W | 25°C | 85lm 80lm~90lm | 530nm 525nm ~ 535nm | 550 nm | T-1 | |||||||||||||||||||
ELSW-F81R3-0LPNM-BR4R6 | Everlight Electronics |
Min: 1 Mult: 1 |
0 | 0x0x0 | download | SHWO | Surface Mount | Surface Mount | Tape & Reel (TR) | 0.138Lx0.138W 3.50mmx3.50mm | 1 (Unlimited) | 100°C | -40°C | 0.088 2.23mm | ROHS3 Compliant | 2011 | /files/everlightelectronicscoltd-elswf81r30lpnmbr4r6-datasheets-7505.pdf | 1414 (3535 Metric) | Red | ROUND | 2 | 12 Weeks | 3 | No | TAPE AND REEL 7" | 1 | 3W | 750mA | Clear | 700mA | SINGLE COLOR LED | 120° | Circular | 1 | SINGLE WITH BUILT-IN ZENER DIODE | 2.65V | 23 lm | 8°C/W | 33 lm/W | 25°C | 85lm 80lm~90lm | 623nm 615nm ~ 630nm | |||||||||||||||||||||||
XTEARY-02-0000-000000M06 | Cree Inc. |
Min: 1 Mult: 1 |
0 | 0x0x0 | download | XLamp® XT-E | Surface Mount | Surface Mount | Tape & Reel (TR) | 0.136Lx0.136W 3.45mmx3.45mm | 1 (Unlimited) | 85°C | 0.100 2.54mm | RoHS Compliant | /files/creeinc-xteary000000000000k01-datasheets-5178.pdf | 1414 (3535 Metric) | Blue | 1.5A | XTEARY | 350mA | SINGLE COLOR LED | 140° | 2.85V | 5°C/W | 538mW 525mW~550mW | 463nm 460nm ~ 465nm | 1.5A | ||||||||||||||||||||||||||||||||||||||
LY W5SN-KXLX-35-0-700-R18-Z | OSRAM Opto Semiconductors |
Min: 1 Mult: 1 |
0 | 0x0x0 | download | Platinum DRAGON | Surface Mount | Tape & Reel (TR) | 0.276Lx0.236W 7.00mmx6.00mm | 2 (1 Year) | 0.079 2.00mm | ROHS3 Compliant | /files/osramoptosemiconductorsinc-lrw5snjyky10700r18z-datasheets-5865.pdf | 2-SMD, Gull Wing | Yellow | SMD | 120° | 2.55V | 6.5°C/W | 57 lm/W | 25°C | 101lm 71lm~130lm | 588nm 583nm ~ 592nm | 700mA | 1A | ||||||||||||||||||||||||||||||||||||||||
XQERED-H2-0000-000000501 | Cree Inc. |
Min: 1 Mult: 1 |
0 | 0x0x0 | download | XLamp® XQ-E | Surface Mount | Surface Mount | Tape & Reel (TR) | 0.063Lx0.063W 1.60mmx1.60mm | 1 (Unlimited) | 0.035 0.90mm | RoHS Compliant | /files/creeinc-xqered000000000000501-datasheets-0849.pdf | 0606 (1616 Metric) | Red | 1A | 125° | 2.2V | 5°C/W | 77 lm/W | 25°C | 59lm 57lm~62lm | 625nm 620nm ~ 630nm | 350mA | ||||||||||||||||||||||||||||||||||||||||
XPEGRN-L1-R250-00B03 | Cree Inc. |
Min: 1 Mult: 1 |
0 | 0x0x0 | download | XLamp® XP-E | Surface Mount | Surface Mount | Tape & Reel (TR) | 0.136Lx0.136W 3.45mmx3.45mm | 1 (Unlimited) | 150°C | 0.084 2.13mm | RoHS Compliant | /files/creeinc-xpeeprl1000000901-datasheets-1080.pdf | 1414 (3535 Metric) | Green | 3.5W | 1A | Clear | XPE | 350mA | 130° | 3.4V | 93.9 lm | 15°C/W | 84 lm/W | 25°C | 97lm 94lm~100lm | 530nm 525nm ~ 535nm | |||||||||||||||||||||||||||||||||||
XPERDO-L1-R250-00602 | Cree Inc. |
Min: 1 Mult: 1 |
0 | 0x0x0 | download | XLamp® XP-E | Surface Mount | Surface Mount | Tape & Reel (TR) | 0.136Lx0.136W 3.45mmx3.45mm | 1 (Unlimited) | 150°C | 0.084 2.13mm | RoHS Compliant | /files/creeinc-xpeeprl1000000901-datasheets-1080.pdf | 1414 (3535 Metric) | Red-Orange | 3.5W | 700mA | Clear | XPE | 350mA | 130° | 2.1V | Orange, Red | 62 lm | 8°C/W | 88 lm/W | 25°C | 65lm 62lm~67lm | 613nm 610nm ~ 615nm | ||||||||||||||||||||||||||||||||||
XPEBLU-L1-R250-00W01 | Cree Inc. |
Min: 1 Mult: 1 |
0 | 0x0x0 | download | XLamp® XP-E | Surface Mount | Surface Mount | Tape & Reel (TR) | 0.136Lx0.136W 3.45mmx3.45mm | 1 (Unlimited) | 0.084 2.13mm | RoHS Compliant | /files/cree-xpeblul1r25000w01-datasheets-3428.pdf | 1414 (3535 Metric) | Blue | 3 Weeks | 1A | XPE | 130° | 3.1V | 9°C/W | 25 lm/W | 25°C | 27lm 24lm~31lm | 475nm 465nm ~ 485nm | 350mA | ||||||||||||||||||||||||||||||||||||||
XPCROY-L1-0000-00901 | Cree Inc. |
Min: 1 Mult: 1 |
0 | 0x0x0 | download | XLamp® XP-C | Surface Mount | Surface Mount | Tape & Reel (TR) | 0.136Lx0.136W 3.45mmx3.45mm | 1 (Unlimited) | 85°C | 0.084 2.13mm | RoHS Compliant | /files/creeinc-xpcrdol1000000601-datasheets-0452.pdf | 1414 (3535 Metric) | Blue | ROUND | 3.45mm | 2 | 2 | UL RECOGNIZED | TR, 7 INCH | 1 | 2W | 500mA | Clear | XPC | 1 | 350mA | SINGLE COLOR LED | 125° | SINGLE | 5V | 3.9V | 3.3V | 12°C/W | 25°C | 388mW 350mW~425mW | 458nm 450nm ~ 465nm | 465 nm | 500mA | |||||||||||||||||||||||
XPERDO-L1-0000-00B01 | Cree Inc. |
Min: 1 Mult: 1 |
0 | 0x0x0 | download | XLamp® XP-E | Surface Mount | Bulk | 0.136Lx0.136W 3.45mmx3.45mm | 1 (Unlimited) | 0.084 2.13mm | RoHS Compliant | /files/creeinc-xpebbll1r25000305-datasheets-2522.pdf | 1414 (3535 Metric) | Red-Orange | 10 Weeks | 2.1V | 8.5°C/W | 25°C | 350mA | 700mA | ||||||||||||||||||||||||||||||||||||||||||||
XPEAMB-L1-R250-00302 | Cree Inc. |
Min: 1 Mult: 1 |
0 | 0x0x0 | download | XLamp® XP-E | Surface Mount | Surface Mount | Tape & Reel (TR) | 0.136Lx0.136W 3.45mmx3.45mm | 1 (Unlimited) | 150°C | 0.084 2.13mm | RoHS Compliant | /files/creeinc-xpeeprl1000000901-datasheets-1080.pdf | 1414 (3535 Metric) | Amber | 3 Weeks | 3.5W | 500mA | Clear | XPEAMB-L1-R250 | 350mA | 130° | 2.1V | Orange | 45.7 lm | 10°C/W | 67 lm/W | 25°C | 49lm 46lm~52lm | 588nm 585nm ~ 590nm | |||||||||||||||||||||||||||||||||
XTEARY-02-0000-000000M07 | Cree Inc. |
Min: 1 Mult: 1 |
0 | 0x0x0 | download | XLamp® XT-E | Surface Mount | Surface Mount | Tape & Reel (TR) | 0.136Lx0.136W 3.45mmx3.45mm | 1 (Unlimited) | 85°C | 0.100 2.54mm | RoHS Compliant | /files/creeinc-xteary000000000000k01-datasheets-5178.pdf | 1414 (3535 Metric) | Blue | 1.5A | XTEARY | 350mA | 140° | 2.85V | 5°C/W | 538mW 525mW~550mW | 455nm 453nm ~ 458nm | 1.5A | |||||||||||||||||||||||||||||||||||||||
LH CPDP-1T3T-1-Z | OSRAM Opto Semiconductors |
Min: 1 Mult: 1 |
0 | 0x0x0 | download | OSLON SSL | Surface Mount | Tape & Reel (TR) | 0.118Lx0.118W 3.00mmx3.00mm | 2 (1 Year) | 0.062 1.58mm | ROHS3 Compliant | /files/osramoptosemiconductorsinc-lhcpdp1t3t1z-datasheets-6844.pdf | 1212 (3030 Metric) | Red | 150° | 2.15V | 7°C/W | 25°C | 340mW 280mW~400mW | 645nm Typ | 400mA | 1A |
Please send RFQ , we will respond immediately.