T81N5D312-05 TE Connectivity Relay or Contactor (Other) In Stock
TE Connectivity T81N5D312-05 is a general-purpose SPDT relay with a 5 VDC coil, 55 Ω coil resistance, 450 mW coil power, and a 15.4 mm × 10.9 mm × 11.2 mm body for through-hole PCB mounting. REACH-compliant. From $2.50 in stock, worldwide shipping.
- Manufacturer
- TE Connectivity
- Package
- Other
- Pin Count
- 5
- Lifecycle
- OBSOLETE
- Datasheet
- T81N5D312-05 Datasheet PDF
- Category
- Relay or Contactor
- Price
- From $1.1700(MOQ 800)
- Temp Range
- -30.0°C to 60.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- SPDT configuration with 5 VDC operate coil and 3.5 V operate voltage enables direct drive from 5 V microcontroller or logic-level transistors
- 55 Ω coil resistance limiting coil current to 90 mA at rated 5 V minimizes power draw in battery-operated switching applications
- Compact 15.4 mm × 10.9 mm × 11.2 mm body provides high contact switching capability in a through-hole footprint suitable for PCB relay control circuits
Applications
The T81N5D312-05 is used in industrial control panels, home automation systems, and HVAC equipment where a 5 VDC logic signal must switch higher-voltage or higher-current AC and DC loads through isolated SPDT contacts. Its 450 mW coil power and 3.5 V operate voltage allow direct drive by a 5 V microcontroller GPIO through a small NPN transistor, making it popular in Arduino-based and embedded relay driver boards. The relay is also applied in test and measurement equipment, alarm systems, and programmable logic controllers as a cost-effective general-purpose switching element.
Specifications
| Reach Compliance Code | Compliant |
| YTEOL | 0 |
| Body Breadth | 10.9mm |
| Body Height | 11.2mm |
| Body Length or Diameter | 15.4mm |
| Coil Current(DC)-Max | 0.09A |
| Coil Operate Voltage(DC) | 3.5V |
| Coil Power | 450mW |
| Coil Release Voltage(DC) | 0.25V |
| Coil Resistance | 55Ω |
| Coil Voltage(DC)-Max | 5V |
| Coil Voltage-Nom | 5V |
| Coil/Input Supply Type | AC/DC |
| Contact (AC) Max Power Rating R Load | 120VA@125VAC |
| Contact (AC) Max Rating R Load | 1A@120VAC |
| Contact Current(AC)-Max | 2A |
| Contact Current(DC)-Max | 2A |
| Contact (DC) Max Power Rating R Load | 30W@60VDC |
| Contact (DC) Max Rating R Load | 1A@24VDC |
| Contact Resistance | 50mΩ |
| Contact Voltage(AC)-Max | 120V |
| Contact Voltage(DC)-Max | 24V |
| Contact/Output Supply Type | AC/DC |
| Electrical Life | 100000 Cycle(s) |
| End Contact Material | NICKEL PALLADIUM ALLOY |
| End Contact Plating | GOLD |
| Input Switching Control Type | Random |
| Insulation Resistance | 1000000000000Ω |
| Mounting Feature | PANEL MOUNT |
| Operate Time | 5ms |
| Packing Method | BOX; TUBE |
| Physical Dimension | 15.9mm x 10.9mm x 11.7mm |
| Reference Standard | CSA; UL |
| Relay Action | MOMENTARY |
| Relay Form | 1 FORM C |
| Relay Function | SPDT |
| Relay Type | POWER/SIGNAL RELAY |
| Release Time | 2ms |
| Surface Mount | NO |
| Terminal Length | 0.003098806197612395inch |
| Termination Type | SOLDER/QUICK CONNECT |
| Package | Other |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8536.41.00.20 |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What coil voltage and current does T81N5D312-05 need to reliably operate from a 5 V microcontroller output?
T81N5D312-05 has a coil operate voltage of 3.5 V and a rated coil supply of 5 VDC with a 55 Ω resistance, drawing approximately 90 mA at 5 V. A standard GPIO pin typically sources only 20 mA to 40 mA, so a small NPN transistor such as 2N2222 or BC547 is required to switch the 90 mA coil current. The coil release voltage is 0.25 V, meaning the relay opens reliably as soon as the transistor is turned off and the coil voltage drops below 0.25 V, giving precise on-off control from 3.3 V or 5 V logic.
In which industrial automation scenarios does the T81N5D312-05 SPDT relay outperform a solid-state relay at similar cost?
T81N5D312-05 is preferred over a solid-state relay in applications requiring complete galvanic isolation between the control circuit and the switched load, switching both AC and DC loads with a single SPDT contact, and zero off-state leakage current. Solid-state relays typically have a small leakage current of 1 mA to 10 mA in the off state, which can hold residual voltage on capacitive loads. The electromechanical T81N5D312-05 relay opens its contacts fully, making it the right choice for safety circuits, valve solenoid control, and alarm outputs in HVAC and industrial control panels where zero off-state leakage is critical.
How does the 450 mW coil power consumption of T81N5D312-05 affect relay selection in battery-powered remote sensor applications?
At 450 mW coil power, T81N5D312-05 draws 90 mA from a 5 V supply continuously while energized. For a battery-powered application running on 4 AA cells providing approximately 2000 mAh, continuous relay energization would deplete the battery in roughly 22 hours. Designers should use the relay only for brief switching events and de-energize it after the contact change is complete, relying on a latching relay or a bistable driver if the controlled load must stay switched on for extended periods. Alternatively, the SPDT contact can be used in its normally-closed position so the coil stays de-energized for the most common operating state, conserving battery life.
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About TE Connectivity
TE Connectivity is a leading electronic component manufacturer. FindMyChip sources TE Connectivity ICs directly from authorized China distributors, offering competitive pricing and reliable stock.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 800+ | $1.6600 | $1328.00 |
| 2000+ | $1.6300 | $3260.00 |
| 2500+ | $1.2800 | $3200.00 |
| 5000+ | $1.1900 | $5950.00 |
| 7500+ | $1.1700 | $8775.00 |
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