HE721C2410 LITTELFUSE Relay or Contactor (Other) In Stock
Littelfuse HE721C2410 is a compact signal relay with 24 V DC coil, 2000 Ω coil resistance, 288 mW coil power, and integrated coil suppression diode. The relay features 16 V operate voltage and 2 V release voltage for reliable switching in control circuits. Available worldwide for industrial automation, telecom, and instrumentation applications.
- Manufacturer
- LITTELFUSE
- Package
- Other
- Pin Count
- 8
- Lifecycle
- OBSOLETE
- Datasheet
- HE721C2410 Datasheet PDF
- Category
- Relay or Contactor
- Price
- From $3.3750(MOQ 1)
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Integrated coil suppression diode eliminates need for external flyback protection, simplifying PCB design
- 24 V DC coil with 2000 Ω resistance and 288 mW power consumption for low-heat operation
- Precise operate voltage of 16 V and release voltage of 2 V for reliable switching in signal control circuits
Applications
The HE721C2410 is designed for signal switching in industrial automation systems, programmable logic controllers, and building automation panels where a reliable 24 V coil relay is needed. Its integrated suppression diode makes it ideal for use alongside inductive loads in motor control and solenoid driver circuits. The compact 19.05 mm × 7.22 mm × 5.5 mm body fits into space-constrained relay boards in telecom and instrumentation equipment.
Specifications
| YTEOL | 0 |
| Additional Feature | COIL SUPPRESSION DIODE |
| Body Breadth | 7.22mm |
| Body Height | 5.5mm |
| Body Length or Diameter | 19.05mm |
| Coil Current(DC)-Max | 0.012A |
| Coil Operate Voltage(DC) | 16V |
| Coil Power | 288mW |
| Coil Release Voltage(DC) | 2V |
| Coil Resistance | 2000Ω |
| Coil Voltage(DC)-Max | 44V |
| Coil Voltage-Nom | 24V |
| Coil/Input Supply Type | DC |
| Contact Current(DC)-Max | 0.25A |
| Contact (DC) Max Power Rating R Load | 5W@175VDC |
| Contact (DC) Max Rating R Load | 0.25A@175VDC |
| Contact Resistance | 200mΩ |
| Contact Voltage(DC)-Max | 175V |
| Contact/Output Supply Type | DC |
| Input Switching Control Type | Random |
| Insulation Resistance | 10000000000Ω |
| Mounting Feature | THROUGH HOLE-STRAIGHT |
| Operate Time | 3ms |
| Packing Method | BULK |
| Physical Dimension | 19.05mm x 7.22mm x 5.5mm |
| Reference Standard | CUL; UL |
| Relay Action | MOMENTARY |
| Relay Form | 1 FORM C |
| Relay Function | SPDT |
| Relay Type | DRY REED RELAY |
| Release Time | 3ms |
| Sealing | HERMETICALLY SEALED |
| Surface Mount | NO |
| Terminal Length | 0.002999745999491999inch |
| Termination Type | SOLDER |
| Package | Other |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8536.49.00.50 |
| Country of Origin | Mainland China |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for HE721C2410:
suggested
suggested
Frequently Asked Questions
What coil voltage and power does the HE721C2410 require for reliable operation?
The HE721C2410 requires a 24 V DC coil voltage for nominal operation, with a 16 V operate voltage threshold and a 2 V release voltage. The coil resistance is 2000 Ω, and the coil power consumption is 288 mW. Designs should ensure the supply can maintain at least 16 V under load to guarantee reliable pull-in across temperature extremes.
Why does the HE721C2410 include a built-in coil suppression diode, and when does that matter most?
The built-in coil suppression diode clamps the inductive voltage spike generated when the relay coil is de-energized. Without it, the back-EMF spike can reach several hundred volts and damage driver transistors or microcontrollers. Including the diode internally eliminates the need for an external flyback diode, reducing component count and PCB area, which is especially valuable in dense industrial I/O boards and PLC output modules.
In which types of signal-switching applications does the HE721C2410 outperform a solid-state relay?
The HE721C2410 electromechanical relay provides true galvanic isolation and near-zero on-state resistance compared to solid-state relays, making it preferable for low-level signal switching where voltage drop must be minimised. For applications requiring switching of 24 V control signals at low currents up to 12 mA, the mechanical contact eliminates the leakage current and forward voltage drop inherent in solid-state devices, benefiting precision measurement and instrumentation circuits.
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About LITTELFUSE
LITTELFUSE is a leading electronic component manufacturer. FindMyChip sources LITTELFUSE ICs directly from authorized China distributors, offering competitive pricing and reliable stock.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $6.7500 | $6.75 |
| 2+ | $4.5000 | $9.00 |
| 7+ | $3.3750 | $23.63 |
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