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onsemi HCPL2631SD
- Part No.:
- HCPL2631SD
- Manufacturer:
- onsemi
- Category:
- Logic Output Optoisolators
- Package:
- 8-SMD, Gull Wing
- Datasheet:
-
HCPL2631SD.pdf
- Description:
- OPTOISO 2.5KV 2CH OPEN COLL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,248
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Product details
Overview
HCPL2631SD from ON Semiconductor (formerly Fairchild) is a dual-channel, high-speed logic gate optocoupler with 10 MBit/s data rate, 5 kV/µs common-mode transient immunity (CMTI), and open-collector strobable outputs. It isolates digital signals between 5 V LSTTL/TTL/CMOS domains in switching power supplies and industrial I/O interfaces.
For engineers reviewing the HCPL2631SD datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed dual-channel timing matching, enable-controlled output strobing, CMTI performance at 400 V common-mode step, and compatibility with 5 V supply rails across –40°C to +85°C.
Technical Context
The HCPL2631SD integrates two independent AlGaAs LED–photodetector–logic-gate channels in one 8-pin DIP package. Each channel features a strobable open-collector output with internal pull-up on the enable input, supporting wired-OR configuration and precise timing control.
Its architecture delivers matched propagation delays (TPLH/TPHL ≤ 75 ns each), pulse width distortion < 35 ns, and fan-out of 8 into standard TTL loads - all specified over full industrial temperature range without derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | 10 MBit/s - supports RS-422/485 line receiver and isolated SPI clock/data paths |
| CMTI (High/Low) | 5 kV/µs - ensures reliable operation during fast transients in motor drives and SMPS feedback loops |
| Propagation Delay | ≤ 75 ns (TPLH/TPHL) - enables sub-100 ns digital isolation for real-time control systems |
| Fan-out | 8 TTL loads - drives multiple downstream gates without external buffering |
| Supply Voltage | 4.5–5.5 V - compatible with standard 5 V logic rails and low-dropout regulators |
| Isolation Voltage | 2500 VRMS - meets reinforced insulation requirements for industrial equipment safety standards |
| Operating Temp | –40°C to +85°C - qualified for use in uncontrolled ambient environments including factory floors |
Pinout & Package
HCPL2631SD uses an 8-pin plastic DIP (dual in-line package) with gull-wing surface-mount leads (SD suffix). Pin 1 is marked with dot; pins 1–4 form the input side (Channel 1 & 2 anodes/cathodes), pins 5–8 the output side (VCC, VO1, VO2, GND).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VF1 Anode | LED anode for Channel 1 - requires current-limiting resistor (e.g., 330 Ω @ 5 V) |
| 2 | VF2 Anode | LED anode for Channel 2 - independently controllable from Channel 1 |
| 3 | VCC | Positive supply for detector logic - must be bypassed with ≥0.1 µF capacitor to Pin 5 (GND) |
| 4 | VO1 | Open-collector output for Channel 1 - sinks up to 13 mA; requires external pull-up |
| 5 | GND | Detector ground reference - separate from input-side ground for galvanic isolation |
| 6 | VO2 | Open-collector output for Channel 2 - electrically isolated from VO1 and matched in timing |
| 7 | VE | Enable input - active-high; internally pulled up; disables both outputs when low |
| 8 | VF1/VF2 Cathode | Common cathode for both LEDs - connects to input-side ground or signal return |
Key Features
| Feature | Design Value |
|---|---|
| Strobable dual outputs | Single VE pin controls both VO1 and VO2 simultaneously - simplifies synchronization in multi-signal isolation |
| Matched channel timing | Inter-channel TPLH/TPHL skew < 15 ns - critical for differential signaling and encoder quadrature decoding |
| Wired-OR capability | Open-collector outputs allow direct connection to shared bus lines without contention risk |
| No external pull-up required on VE | Internal pull-up eliminates need for discrete resistor - reduces BOM count and board space |
| UL recognition (E90700) | Validated for end-equipment safety compliance - accelerates regulatory certification for industrial systems |
Applications
| Motor Drive Feedback Isolation | Industrial Digital I/O Module |
|---|---|
|
Use Scenario: Isolating PWM gate drive signals and current-sense comparator outputs in 3-phase inverter stages. IC Role / Device Role / Timing Role: Dual-channel optocoupler providing simultaneous, time-aligned isolation of upper/lower switch control and fault reporting signals. Use Value: Enables safe, noise-immune transmission of fast-switching signals across 500 V potential differences while maintaining <15 ns inter-channel skew. |
Use Scenario: Providing isolated digital inputs/outputs in programmable logic controller (PLC) backplane modules. IC Role / Device Role / Timing Role: Logic gate optocoupler converting field-side 24 V DC signals to 5 V microcontroller-compatible levels with CMTI >5 kV/µs. Use Value: Eliminates ground loops and prevents EMI-induced false triggering in noisy factory environments. |
| Switching Power Supply Feedback | Isolated Data Multiplexing |
|
Use Scenario: Transmitting error amplifier output across isolation barrier in flyback or forward converters. IC Role / Device Role / Timing Role: High-speed optocoupler delivering stable, low-delay feedback path for voltage regulation loop. Use Value: Supports >100 kHz switching frequencies with propagation delay <75 ns and minimal phase shift. |
Use Scenario: Sharing a single microcontroller UART line across multiple isolated subsystems via time-division multiplexing. IC Role / Device Role / Timing Role: Dual-channel gate optocoupler enabling bidirectional, strobe-synchronized data routing between isolated domains. Use Value: Reduces component count versus discrete single-channel solutions while preserving timing integrity across channels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed logic gate optocoupler applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| HCPL2630 | Same pinout and package; identical electrical specs except CMR = 10 kV/µs (vs. 5 kV/µs for HCPL2631) | Preferred where higher CMTI is required, e.g., in high-noise motor control or medical equipment | Select HCPL2630 if system-level EMC testing requires >5 kV/µs immunity; otherwise HCPL2631SD suffices for standard industrial use. |
| 6N137SD | Single-channel, same speed and timing specs; shares 8-pin DIP-SD footprint but lacks second channel and VE pin | Suitable only for point-to-point isolation; cannot replace dual-channel functionality without redesign | Use 6N137SD only when isolating one signal path; HCPL2631SD provides integrated dual-channel solution with shared enable. |
Compared with HCPL2630 and 6N137SD, the HCPL2631SD offers balanced cost-performance for dual-signal isolation: it provides verified 5 kV/µs CMTI and matched timing at lower unit cost than HCPL2630, while eliminating PCB area and layout complexity versus two 6N137SDs.
Availability
HCPL2631SD is available at Aetrix Electronics and suitable for switching power supplies, industrial I/O modules, and motor drive feedback circuits requiring stable component supply and long-term lifecycle support.
Supply support for HCPL2631SD 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
ON Semiconductor (formerly Fairchild Semiconductor) is a global leader in intelligent power and sensing technologies, serving automotive, industrial, cloud, and consumer markets with energy-efficient semiconductor solutions.
The HCPL2631SD belongs to ON Semiconductor's legacy high-speed optocoupler product line, designed specifically for robust digital signal isolation in harsh electromagnetic environments typical of factory automation and power conversion.
FAQ
What is the maximum recommended input current for HCPL2631SD?
The absolute maximum DC forward input current per channel is 30 mA, but the recommended operating condition is ≤5 mA to ensure ≥20% CTR margin over lifetime. At 5 mA, HCPL2631SD guarantees minimum sink current of 13 mA per output, supporting fan-out of 8 TTL loads across –40°C to +85°C.
Does HCPL2631SD require an external pull-up resistor on the VE pin?
No. HCPL2631SD includes an internal pull-up resistor on the VE (enable) pin, eliminating the need for an external component. This simplifies design and reduces bill-of-materials count while ensuring predictable high-state default behavior during power-up or floating conditions.
Can HCPL2631SD operate with a 3.3 V supply on the output side?
No. HCPL2631SD's detector logic requires VCC between 4.5 V and 5.5 V for guaranteed operation; 3.3 V is outside the recommended operating range and will result in undefined output states and degraded timing performance. Use a level-shifter or 5 V regulator if interfacing with 3.3 V controllers.
What is the isolation capacitance specification for HCPL2631SD?
The input-to-output capacitance (CI-O) of HCPL2631SD is 0.6 pF at 1 MHz, measured per isolation barrier. This ultra-low value minimizes capacitive coupling of high-frequency noise across the barrier, contributing to its 5 kV/µs common-mode transient immunity rating.
Is HCPL2631SD compliant with UL safety standards?
Yes. HCPL2631SD is UL recognized under file #E90700, confirming compliance with UL 1577 for component-level optocoupler safety. This certification covers dielectric withstand (2500 VRMS), creepage/clearance, and construction requirements for use in end equipment seeking UL listing.
HCPL2631SD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-SMD, Gull Wing
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Number of Channels:
- 2
- Inputs - Side 1/Side 2:
- 2/0
- Voltage - Isolation:
- 2500Vrms
- Common Mode Transient Immunity (Min):
- 5kV/µs
- Input Type:
- DC
- Output Type:
- Open Collector
- Current - Output / Channel:
- 50 mA
- Data Rate:
- 10Mbps
- Propagation Delay tpLH / tpHL (Max):
- 75ns, 75ns
- Rise / Fall Time (Typ):
- 50ns, 12ns
- Voltage - Forward (Vf) (Typ):
- 1.4V
- Current - DC Forward (If) (Max):
- 30mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SMD
HCPL2631SD FAQ
1.How can I place an order for HCPL2631SD through Aetrix?
Please submit a Request for Quotation (RFQ) for HCPL2631SD 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 HCPL2631SD reliable?
The price and inventory of HCPL2631SD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HCPL2631SD is usually 5 days.
3.What payment methods are accepted for HCPL2631SD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HCPL2631SD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HCPL2631SD?
HCPL2631SD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HCPL2631SD 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 HCPL2631SD?
For technical support, including HCPL2631SD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HCPL2631SD requirements.
6.How does Aetrix verify that HCPL2631SD is sourced from the original manufacturer or authorized distributors?
All HCPL2631SD 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 HCPL2631SD meets industry standards.
7.What is the process for return or replacement of HCPL2631SD?
All HCPL2631SD units undergo pre-shipment inspection (PSI). If there is an issue with HCPL2631SD, 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 HCPL2631SD part is unused and in its original packaging.
Return procedure for HCPL2631SD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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