Broadcom Limited ASSR-1228-002E

Overview

ASSR-1228-002E from Broadcom is a dual-channel, normally-off, single-pole-single-throw (SPST) solid-state relay based on photo-MOSFET technology. It features two independent 60 V output channels with 0.2 A continuous current rating per channel, 0.25 Ω typical on-resistance (DC), and 3750 Vrms input-output isolation. It operates with 3 mA minimum LED input current and is packaged in a 300-mil DIP-8 tube format for industrial control and telecom switching applications.

For engineers reviewing the ASSR-1228-002E datasheet, pinout, applications, or equivalent options, key selection criteria include dual-channel SPST functionality, 60 V/0.2 A per channel output capability, DIP-8 through-hole package compatibility, UL/CSA safety certification, and photovoltaic gate drive architecture enabling CMOS-level input control without external bias.

Technical Context

The ASSR-1228-002E integrates an AlGaAs infrared LED optically coupled to a high-speed photovoltaic diode array that drives two discrete high-voltage MOSFETs - one per channel. Each channel switches independently with no electrical connection between inputs or outputs.

It implements true Form A (normally open) operation: conduction occurs only when ≥3 mA flows through the input LED; turn-off is guaranteed at ≤0.8 V forward voltage. Its 3750 Vrms isolation, 4.9 mm creepage/clearance, and IIIa insulation group meet UL1577 and CSA Component Acceptance requirements for reinforced insulation in safety-critical systems.

Key Specifications

Pinout & Package

ASSR-1228-002E uses an 8-pin dual-in-line package (DIP-8) with 300-mil row spacing. Pin 1–4 form the isolated input side (LED anode/cathode pairs for both channels), while pins 5–8 constitute the isolated output side (MOSFET drain/source pairs). The package meets RoHS compliance and supports JEDEC-standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLP3558A and VO3120, the ASSR-1228-002E uniquely delivers dual SPST functionality in a RoHS-compliant 300-mil DIP-8 through-hole package with UL/CSA-certified 3750 Vrms isolation - making it optimal for legacy industrial and telecom designs requiring drop-in electromechanical relay replacement without layout changes.

Availability

ASSR-1228-002E is available at Aetrix Electronics and suitable for industrial controls, telecommunications switching, and medical diagnostic equipment requiring stable component supply, long-term lifecycle support, and certified safety isolation.

Supply support for ASSR-1228-002E 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. is a global semiconductor leader specializing in infrastructure software, networking, and optoelectronic components for enterprise, industrial, and communications markets.

The ASSR-12XX series was designed specifically as solid-state replacements for electromechanical relays in safety-isolated signal routing applications - emphasizing reliability, zero contact wear, and regulatory compliance over mechanical alternatives.

FAQ

What is the maximum continuous output current per channel for ASSR-1228-002E?

The ASSR-1228-002E supports 0.2 A continuous output current per channel at 25°C ambient temperature. This rating decreases with rising temperature - Figure 4 in the AV02-0173EN datasheet shows derating to approximately 0.15 A at 85°C. Exceeding these limits risks thermal runaway due to increased R(ON) and junction temperature beyond the 125°C maximum.

Does ASSR-1228-002E require an external gate drive voltage for its MOSFET outputs?

No, the ASSR-1228-002E does not require an external gate drive voltage. Its photovoltaic diode array generates sufficient gate voltage from the input LED current to fully enhance both MOSFETs. With only 3 mA input current, the ASSR-1228-002E achieves reliable turn-on - eliminating the need for auxiliary bias supplies or level-shifting circuitry.

Can ASSR-1228-002E switch AC signals, and what is its maximum AC voltage rating?

Yes, the ASSR-1228-002E can switch AC signals up to 60 V peak (±60 V), as specified by its |VO(OFF)| = 60 V rating. Its bidirectional output structure supports both AC and DC loads. However, for AC applications, ensure transient overvoltage protection is implemented, since the 60 V rating is a steady-state withstand value - not a surge rating.

What safety certifications apply to ASSR-1228-002E?

The ASSR-1228-002E is UL Recognized per UL 1577 (3750 Vrms for 1 minute) and approved under CSA Component Acceptance Notice #5. It also meets IEC/EN/DIN EN 60747-5-2 insulation requirements, with IIIa insulation group classification and CTI = 175 V. These certifications validate its use in safety-critical applications including medical and industrial equipment.

Is ASSR-1228-002E compatible with standard DIP-8 footprints used for electromechanical relays?

Yes, the ASSR-1228-002E uses a standard 300-mil DIP-8 package with 0.100" lead pitch and 0.300" row spacing - matching common EMR footprints. Its pinout (LED inputs on pins 1–4, outputs on 5–8) allows direct substitution in existing layouts without PCB redesign, provided trace widths and thermal relief accommodate 0.2 A per channel.