onsemi HCPL2631SV

Overview

HCPL2631SV from ON Semiconductor (formerly Fairchild) is a dual-channel, high-speed logic gate optocoupler with 10 Mbit/s data rate, strobable open-collector outputs, and 5 kV/µs minimum common-mode transient immunity (CMTI). It integrates two AlGaAs LED–photodetector pairs in one 8-pin DIP package, used for isolated digital signal transmission in industrial I/O, motor control feedback, and switching power supply gate drive circuits.

For engineers reviewing the HCPL2631SV datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed 10 Mbit/s operation over –40°C to +85°C, dual independent enable inputs, fan-out of 8 into TTL loads, and VDE 0884 certification indicated by the 'V' suffix - critical for reinforced isolation in safety-compliant designs.

Technical Context

The HCPL2631SV implements two independent optically isolated channels, each combining an 850 nm AlGaAs LED with a high-speed integrated photodetector logic gate featuring strobable output control and wired-OR open-collector topology. Each channel supports independent enable (VE) inputs with internal pull-up, allowing selective channel gating without external components.

Its isolation barrier meets VDE 0884-10 requirements (reinforced insulation), with 2500 V_RMS withstand voltage, 10¹² Ω input-to-output resistance, and 0.6 pF inter-winding capacitance - enabling low-noise, high-CMTI signal coupling across noisy power domains while maintaining tight propagation delay matching (±35 ns pulse width distortion).

Key Specifications

Pinout & Package

HCPL2631SV uses an 8-pin plastic dual-in-line package (PDIP) with 0.3-inch lead spacing and VDE-certified creepage/clearance. The package includes internal noise shielding and requires a 0.1 µF bypass capacitor between pins 8 (VCC) and 5 (GND).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed logic gate optocoupler applications.

Compared with HCPL2631 and ACPL-M61T, the HCPL2631SV uniquely combines dual-channel operation, VDE 0884-10 certification, and 5 kV/µs CMTI in a legacy-compatible PDIP package - making it the only drop-in option for upgrading existing safety-compliant designs without layout changes.

Availability

HCPL2631SV is available at Aetrix Electronics and suitable for industrial motor control, switching power supply feedback, and programmable logic controller I/O requiring stable component supply and long-term lifecycle assurance.

Supply support for HCPL2631SV 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 supplier of energy-efficient semiconductor solutions for automotive, industrial, cloud computing, and IoT applications.

The HCPL2631SV belongs to the legacy Fairchild high-speed logic gate optocoupler family, designed specifically for noise-immune digital signal isolation in harsh industrial environments where timing fidelity and safety certification are critical.

FAQ

What does the 'V' suffix in HCPL2631SV indicate?

The 'V' suffix in HCPL2631SV denotes VDE 0884-10 certification for reinforced insulation, confirming compliance with stringent creepage, clearance, and partial discharge requirements. This certification is essential for HCPL2631SV deployment in safety-critical industrial equipment such as drives and power supplies meeting IEC 61800-5-1 or EN 60950-1 standards - a distinction not present in the base HCPL2631 variant.

Does HCPL2631SV support independent enable control for each channel?

Yes, HCPL2631SV provides two dedicated enable inputs - VE1 (pin 3) and VE2 (pin 4) - allowing independent gating of each output channel. When an enable pin is pulled low, its corresponding output (VO1 or VO2) enters high-impedance state regardless of LED input status. This feature enables dynamic channel disabling during fault conditions or power sequencing, and is confirmed in the device truth table and electrical characteristics section of the datasheet.

What is the maximum recommended forward current per channel for HCPL2631SV?

The maximum DC forward current per channel for HCPL2631SV is 30 mA, as specified in the Absolute Maximum Ratings table. Operating above this value risks LED degradation and reduced CMTI performance. For reliable 10 Mbit/s operation across temperature, the recommended forward current is 7.5 mA - validated in switching characteristics testing and sufficient to guarantee >13 mA output sink current (fan-out of 8) over –40°C to +85°C.

Can HCPL2631SV replace HCPL2630 in existing designs?

HCPL2631SV can replace HCPL2630 only if VDE certification is required and the design accommodates identical pinout and electrical behavior. Both share the same dual-channel architecture, 10 Mbit/s speed, and 8-pin PDIP package. However, HCPL2631SV has a minimum CMTI of 5 kV/µs versus HCPL2630's 10 kV/µs, and includes VDE 0884-10 qualification. Verify system-level noise immunity margins before substitution, especially in high-dV/dt applications like motor drives.

Why is HCPL2631SV marked 'NOT RECOMMENDED FOR NEW DESIGN'?

HCPL2631SV is marked 'NOT RECOMMENDED FOR NEW DESIGN' due to ON Semiconductor's strategic shift toward newer optocoupler families (e.g., ACPL-MxxT series) with improved CMTI, lower power, and enhanced safety certifications. While HCPL2631SV remains fully supported and available for legacy design refresh and repair, new projects should evaluate alternatives offering longer product lifecycles, RoHS-compliant packaging, and updated regulatory alignment - though HCPL2631SV continues to meet all published specifications and quality standards.