Broadcom Limited ASSR-301C-003E

Overview

ASSR-301C-003E from Broadcom (formerly Avago) is a single-channel, normally-off, solid-state SPST relay in a 4-pin SO package, featuring 250V output withstand voltage, 0.05A current rating, 34Ω typical on-resistance, 0.3nA typical off-state leakage, and 0.07ms turn-on/turn-off times. It serves as a bi-directional signal switch in automated test equipment where low C×R (340pF·Ω), high transient immunity (>1kV/μs), and galvanic isolation are critical.

For engineers reviewing the ASSR-301C-003E datasheet, pinout, applications, or equivalent options, this page delivers verified specifications including input LED threshold (1mA), output off-capacitance (15pF), isolation voltage (3750Vrms), thermal operating range (–40°C to +85°C), and RoHS-compliant lead-free construction.

Technical Context

The ASSR-301C-003E implements opto-isolated MOSFET switching using an AlGaAs infrared LED coupled to a photovoltaic diode array and integrated driver circuitry that controls two high-voltage MOSFETs. Its Form A (normally open) operation requires only 1mA input current to activate and ≤0.8V to deactivate.

It delivers true bi-directional signal switching with symmetrical ±250V output capability, 34Ω typical R(ON) at 5mA LED drive, and ultra-low 0.3nA off-state leakage-enabling high-accuracy measurements in multiplexed data acquisition systems without channel crosstalk or settling errors.

Key Specifications

Pinout & Package

ASSR-301C-003E is housed in a 4-pin Small Outline (SO-4) surface-mount package with gull-wing leads, 3.56 mm body width, and 2.54 mm pitch. Pin 1 = Anode, Pin 2 = Cathode, Pin 3 = Source, Pin 4 = Drain.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLP3554(TP,E) and PS8501-AX, the ASSR-301C-003E uniquely balances 3750V_rms certified isolation, 0.07ms speed, and 0.3nA leakage-making it optimal for high-fidelity, high-throughput ATE and precision DAQ where timing, noise, and safety co-constrain design.

Availability

ASSR-301C-003E is available at Aetrix Electronics and suitable for automatic test equipment, data acquisition systems, and measuring instruments requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing traceability.

Supply support for ASSR-301C-003E 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. designs high-performance analog, digital, and mixed-signal semiconductors for communications, industrial, and test & measurement markets, with heritage from Avago Technologies' optoelectronics division.

The ASSR-301C-003E belongs to Broadcom's ASSR-30xC series of solid-state relays engineered specifically for fast-switching, low-distortion signal routing in automated test and precision instrumentation applications.

FAQ

What is the minimum input current required to turn on the ASSR-301C-003E?

The ASSR-301C-003E turns on with a minimum input current of 1 mA through its internal AlGaAs LED. This low threshold enables direct drive from microcontroller GPIO pins or low-power logic outputs without external amplification. At 5 mA, the device achieves specified R(ON) and switching speed. Operating below 1 mA may result in incomplete or delayed turn-on, especially at temperature extremes.

Does the ASSR-301C-003E support bi-directional signal switching?

Yes, the ASSR-301C-003E supports true bi-directional signal switching across its output terminals (Pins 3 and 4). Its dual-MOSFET output structure allows AC or DC signals up to ±250 V to pass in either direction with matched on-resistance and leakage characteristics. This eliminates polarity concerns in analog multiplexing and makes the ASSR-301C-003E suitable for both sourcing and sinking configurations.

What safety certifications does the ASSR-301C-003E hold?

The ASSR-301C-003E is UL Recognized per UL 1577 (3750 V_rms for 1 minute) and approved under CSA Component Acceptance Notice #5. These certifications validate its input-output insulation performance for industrial and test equipment applications. The -003E suffix confirms full RoHS 6 compliance and lead-free construction, meeting global environmental and safety requirements without derating.

Can the ASSR-301C-003E replace electromechanical relays in high-cycle applications?

Yes, the ASSR-301C-003E is explicitly designed as an EMR/reed relay replacement for high-cycle, high-reliability applications. With no moving parts, it offers unlimited mechanical life, zero contact bounce, and immunity to vibration and shock. Its 0.07ms switching speed exceeds typical EMRs by >100×, and its 0.3nA off-leakage improves measurement accuracy over aging reed contacts-making the ASSR-301C-003E ideal for ATE and datalogger systems demanding >1 million operations.

What is the maximum ambient temperature for continuous operation of the ASSR-301C-003E?

The ASSR-301C-003E is rated for continuous operation from –40°C to +85°C ambient temperature. Its electrical parameters-including R(ON), leakage, and switching time-are fully specified across this range. Junction temperature must not exceed 125°C; at maximum ambient, power dissipation should be limited to keep case temperature ≤100°C. Derating curves in the official datasheet guide thermal design for high-density PCB layouts.