Broadcom Limited ASSR-322R-002E

Overview

ASSR-322R-002E from Broadcom (formerly Avago) is a dual-channel, normally-off, solid-state SPST relay in a 300-mil DIP-8 package, featuring 250V output withstand voltage, 0.2A current rating, 8.5Ω typical on-resistance, 0.25ms typical turn-on time, and 30pA typical off-state leakage - designed for high-throughput automatic test equipment signal switching.

For engineers reviewing the ASSR-322R-002E datasheet, pinout, applications, or equivalent options, key selection criteria include input LED drive compatibility (3mA min), output isolation integrity (3750 Vrms), low C×R (340 pF·Ω), fast transient immunity (>1 kV/μs), and RoHS-compliant lead-free packaging.

Technical Context

The ASSR-322R-002E integrates two independent optically isolated channels, each combining an AlGaAs LED input stage with a photovoltaic diode array driver controlling two high-voltage MOSFETs. It operates as a bi-directional, single-pole-single-throw (SPST), Form A solid-state switch with no moving parts.

Switching is controlled solely by input LED current: conduction initiates at ≥3 mA forward current and terminates when input voltage drops to ≤0.8 V. Its internal architecture delivers galvanic isolation, low thermal drift of R(ON), and stable output leakage (<1 nA) across –40°C to +85°C ambient operation.

Key Specifications

Pinout & Package

ASSR-322R-002E uses an industry-standard 300-mil 8-pin DIP (dual in-line package) with gull-wing-compatible lead form, RoHS-compliant matte-tin plating, and 2.54 mm pitch. The package provides >7.1 mm clearance and >7.4 mm creepage between input and output sides per IEC/EN 60747-5-2.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar solid-state relay applications.

Compared with TLP3558A and VO1263AB, the ASSR-322R-002E uniquely balances dual-channel density, 0.25 ms switching, 30 pA leakage, and DIP-8 through-hole manufacturability - making it optimal for ATE and precision multiplexing where channel count, speed, and leakage are co-constrained.

Availability

ASSR-322R-002E is available at Aetrix Electronics and suitable for automatic test equipment, data acquisition systems, and measuring instrument designs requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant through-hole assembly.

Supply support for ASSR-322R-002E 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

Broadcom Inc. (formerly Avago Technologies) is a global semiconductor leader specializing in optical, wireless, and wired connectivity solutions, with deep heritage in optoelectronics and isolation technology.

The ASSR-322R product line was engineered specifically for high-speed, low-leakage signal switching in automated test and precision measurement systems - prioritizing C×R optimization, thermal stability, and safety-certified isolation.

FAQ

What is the minimum input current required to reliably turn on the ASSR-322R-002E?

The ASSR-322R-002E requires a minimum input current of 3 mA through its LED input to guarantee turn-on across the full –40°C to +85°C operating temperature range. While conduction may initiate at lower currents (~0.5 mA), 3 mA is the specified threshold for qualified performance. Designers should size the series current-limiting resistor accordingly, accounting for forward voltage (1.1–1.65 V) and drive voltage. This ensures robust activation of the ASSR-322R-002E in all environmental conditions.

Does the ASSR-322R-002E support bidirectional signal switching?

Yes, the ASSR-322R-002E supports true bidirectional signal routing - its MOSFET-based output stage has no inherent polarity, enabling AC or DC signals up to ±250 V to pass symmetrically between pins 5/6 and 7/8. This eliminates the need for external diodes or polarity-aware layout. The bidirectional capability is intrinsic to the ASSR-322R-002E's architecture and is validated across its full operating temperature range.

What safety certifications apply to the ASSR-322R-002E?

The ASSR-322R-002E is UL Recognized per UL 1577 (3750 Vrms for 1 minute) and CSA Component Accepted (Notice #5). These certifications cover input-to-output dielectric strength and construction compliance. It also meets IEC/EN 60747-5-2 insulation requirements for reinforced isolation. The ASSR-322R-002E's 7.1 mm clearance and 7.4 mm creepage distances are measured per regulatory standards and documented in its official datasheet.

Can the ASSR-322R-002E replace electromechanical relays directly on existing PCBs?

Yes - the ASSR-322R-002E in the -002E variant uses a standard 300-mil DIP-8 footprint identical to many EMRs and reed relays, enabling direct socket or solder replacement without layout changes. Its pinout (dual-channel, isolated I/O) maps cleanly to common dual-Form-A layouts. However, designers must verify that drive circuitry supplies ≥3 mA LED current and that thermal dissipation (max 680 mW) aligns with board copper area - both critical for reliable ASSR-322R-002E operation.

What is the typical output off-capacitance of the ASSR-322R-002E and why does it matter?

The ASSR-322R-002E has a typical output off-capacitance (C(OFF)) of 45–60 pF at 1 MHz and 0 V bias. This parameter directly impacts high-frequency signal integrity: low C(OFF) minimizes capacitive coupling between open channels, reducing crosstalk in dense multiplexer arrays. Combined with its 340 pF·Ω C×R value, this ensures fast settling and minimal phase distortion - a key reason the ASSR-322R-002E is specified for >10 MHz analog switching in test equipment.