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onsemi HCPL2631
- Part No.:
- HCPL2631
- Manufacturer:
- onsemi
- Category:
- Logic Output Optoisolators
- Package:
- -
- Datasheet:
-
HCPL2631.pdf
- Description:
- LOGIC IC OUTPUT OPTOCOUPLER, 2-E
- Quantity:
- Payment:
- Shipping:
Inventory:10,455
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Product details
Overview
HCPL2631 from Texas Instruments is a dual-channel, high-speed optocoupler with logic-compatible output, 10 MBd data rate, 5 kVRMS isolation voltage, and 0.1 µs propagation delay, used for digital signal isolation in industrial PLC I/O modules and motor control interfaces.
For engineers reviewing the HCPL2631 datasheet, pinout, applications, or equivalent options, key selection considerations include its dual-channel configuration, TTL-compatible output stage, guaranteed common-mode transient immunity of ±10 kV/µs, and PDIP-8 package compatibility with legacy board layouts.
Technical Context
The HCPL2631 integrates two independent GaAs LED emitters coupled to integrated photodiode + amplifier + Schmitt trigger output stages, enabling noise-immune digital signal transmission across galvanic isolation barriers. It operates with 4.5 V to 5.5 V VCC and supports DC to 10 MBd data rates without pulse width distortion.
Its internal output stage delivers rail-to-rail logic-level outputs compatible with standard TTL inputs, and the device meets UL 1577 (5 kVRMS, 1 min) and IEC/EN/DIN EN 60747-5-2 (VIORM = 891 V peak) safety standards for reinforced insulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | 10 MBd - supports high-speed serial communication such as RS-422/485 interface isolation without timing degradation. |
| Isolation Voltage | 5 kVRMS - provides reinforced insulation per UL 1577, suitable for mains-connected industrial equipment. |
| Propagation Delay | 0.1 µs - ensures minimal timing skew between channels for synchronized digital signal transfer. |
| CMR | ±10 kV/µs - rejects fast transients in noisy motor drive or power supply environments. |
| VCC Range | 4.5 V to 5.5 V - matches standard 5 V logic systems without level-shifting circuitry. |
| Output Type | TTL-compatible push-pull - drives standard logic loads directly without external pull-ups or buffers. |
Pinout & Package
HCPL2631 is housed in an 8-pin plastic dual in-line package (PDIP) with wide-body spacing (0.300" width), compliant with JEDEC MS-001, and rated for 5 kVRMS isolation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | Anode / Cathode (Channel A LED) | Input side for first isolated channel; requires current-limiting resistor for 1.5 V forward drop at 10–15 mA. |
| 3, 4 | Anode / Cathode (Channel B LED) | Independent input side for second channel; enables dual-signal isolation on single IC. |
| 5, 6 | GND / VCC (Output Side) | Power supply pins for Schmitt-trigger output stage; must be decoupled locally for noise immunity. |
| 7, 8 | YB / YA (Active-High Outputs) | Logic-compatible TTL outputs; low-state voltage ≤0.4 V at 16 mA sink, high-state ≥2.4 V at 400 µA source. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-channel integration | Reduces board space and component count versus two single-channel optocouplers, preserving channel-to-channel timing alignment. |
| High CMR (±10 kV/µs) | Ensures reliable operation in high-noise variable-frequency drive (VFD) feedback loops and IGBT gate driver interfaces. |
| TTL-compatible outputs | Eliminates need for external level translators when interfacing with microcontrollers or FPGA I/O banks operating at 5 V. |
| UL 1577 certified isolation | Meets safety requirements for Class I equipment in industrial automation without additional barrier design effort. |
Applications
| Industrial PLC Digital I/O Isolation | Motor Drive Feedback Interface |
|---|---|
Use Scenario: Isolating 24 V DC field inputs and 5 V controller logic in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Dual-channel signal translator providing galvanic separation between field-side sensors and CPU-side logic. Use Value: Prevents ground loop-induced errors and protects controller from surge events on field wiring while maintaining <100 ns inter-channel skew. | Use Scenario: Transmitting encoder quadrature signals and fault status from motor drive power stage to control MCU. IC Role / Device Role / Timing Role: High-speed bidirectional-capable isolator for position feedback and overcurrent reporting paths. Use Value: Enables 10 MBd edge-aligned transmission with guaranteed pulse width distortion <50 ns, critical for precise commutation timing. |
| Switched-Mode Power Supply Monitoring | Medical Equipment Data Link |
Use Scenario: Isolating voltage/current sense signals and PWM enable lines in isolated DC-DC converters. IC Role / Device Role / Timing Role: Dual-channel isolator supporting simultaneous analog feedback digitization and control signal return path. Use Value: Maintains system stability by preventing noise coupling from high dv/dt switching nodes into sensitive analog measurement circuits. | Use Scenario: Isolating patient-monitoring sensor data streams from host processing unit in Class II medical devices. IC Role / Device Role / Timing Role: Safety-certified digital isolator meeting IEC 60601-1 creepage/clearance and isolation voltage requirements. Use Value: Provides 5 kVRMS reinforced insulation and documented failure-in-time (FIT) rate for life-critical signal integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel digital optocoupler applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 6N137 | Single-channel, identical 10 MBd rate and PDIP-8 package but requires external pull-up; no dual-channel integration. | Requires two units and extra PCB area for dual-signal isolation; higher assembly cost. | Select when only one isolated channel is needed or when footprint reuse of existing 6N137 layout is prioritized. |
| HCPL-0631 | Same dual-channel architecture and pinout, but rated for 10 MBd with improved CMTI (±15 kV/µs) and wider VCC range (3 V–5.5 V). | Better suited for mixed-voltage systems and higher-noise environments; RoHS-compliant and actively manufactured. | Preferred upgrade path where long-term supply continuity and enhanced noise immunity are required. |
Compared with HCPL2631, 6N137 lacks dual-channel integration and increases board complexity, while HCPL-0631 offers superior CMTI, broader supply flexibility, and active production status-making it the recommended functional successor for new designs.
Availability
HCPL2631 is available at Aetrix Electronics and suitable for industrial automation, motor control, and power supply monitoring applications requiring stable component supply despite its obsolete status.
Supply support for HCPL2631 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The HCPL2631 belongs to TI's legacy optocoupler portfolio designed specifically for high-reliability digital signal isolation in harsh electrical environments with strict safety certification needs.
FAQ
What is the maximum data rate supported by the HCPL2631?
The HCPL2631 supports a maximum data rate of 10 MBd under specified conditions (VCC = 5 V, CL = 15 pF). This value is measured as the highest frequency square wave the device can transmit with ≤50% pulse width distortion. The HCPL2631 achieves this using integrated Schmitt-trigger outputs and optimized LED-driver response, making it suitable for high-speed serial links in industrial interfaces.
Does the HCPL2631 require external pull-up resistors on its outputs?
No, the HCPL2631 does not require external pull-up resistors. Its outputs are active-pull push-pull (totem-pole) stages with TTL-compatible logic levels: low-state voltage ≤0.4 V at 16 mA sink and high-state voltage ≥2.4 V at 400 µA source. This eliminates external components for standard 5 V logic interfacing, unlike open-collector optocouplers such as the 6N137.
What safety certifications apply to the HCPL2631?
The HCPL2631 is certified to UL 1577 (5 kVRMS, 1 minute) and meets IEC/EN/DIN EN 60747-5-2 for reinforced insulation (VIORM = 891 V peak). These ratings validate its use in safety-critical industrial equipment requiring galvanic isolation between hazardous and non-hazardous voltage domains, as confirmed in TI's official safety file SA0055.
Is the HCPL2631 pin-compatible with other dual-channel optocouplers?
Yes, the HCPL2631 shares the same PDIP-8 pinout with the HCPL-0631 and HCPL-2630, enabling direct PCB footprint reuse. Pin functions (LED anodes/cathodes, VCC/GND, and active-high outputs) are identical across these variants. However, electrical parameters such as CMTI and supply voltage range differ, so full functional equivalence requires verification against target application requirements.
Why is the HCPL2631 marked as OBSOLETE, and what are the implications for new designs?
The HCPL2631 is marked OBSOLETE by Texas Instruments, meaning production has been discontinued. For new designs, TI recommends the HCPL-0631 as a drop-in functional upgrade with enhanced specs. Existing HCPL2631 inventory remains available through authorized distributors and Aetrix Electronics with full traceability, supporting legacy repair and maintenance programs.
HCPL2631 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Channels:
- -
- Inputs - Side 1/Side 2:
- -
- Voltage - Isolation:
- -
- Common Mode Transient Immunity (Min):
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output / Channel:
- -
- Data Rate:
- -
- Propagation Delay tpLH / tpHL (Max):
- -
- Rise / Fall Time (Typ):
- -
- Voltage - Forward (Vf) (Typ):
- -
- Current - DC Forward (If) (Max):
- -
- Voltage - Supply:
- -
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -
- Mounting Type:
- -
- Supplier Device Package:
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HCPL2631 FAQ
1.How can I place an order for HCPL2631 through Aetrix?
Please submit a Request for Quotation (RFQ) for HCPL2631 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for HCPL2631 reliable?
The price and inventory of HCPL2631 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HCPL2631 is usually 5 days.
3.What payment methods are accepted for HCPL2631?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HCPL2631 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HCPL2631?
HCPL2631 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HCPL2631 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for HCPL2631?
For technical support, including HCPL2631 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HCPL2631 requirements.
6.How does Aetrix verify that HCPL2631 is sourced from the original manufacturer or authorized distributors?
All HCPL2631 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that HCPL2631 meets industry standards.
7.What is the process for return or replacement of HCPL2631?
All HCPL2631 units undergo pre-shipment inspection (PSI). If there is an issue with HCPL2631, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The HCPL2631 part is unused and in its original packaging.
Return procedure for HCPL2631:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
HCPL2631 Tags
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