Broadcom Limited ASSR-4110-003E

Overview

ASSR-4110-003E from Broadcom is a single-channel, normally-off, Form A solid-state relay (Photo MOSFET) in a 4-pin SO package. It features 400 V output withstand voltage, 0.12 A DC output current rating, 16 Ω typical on-resistance at 25°C, and operates across –40°C to +85°C. It replaces electromechanical relays in low-power AC/DC signal switching applications such as telecom interface isolation and industrial I/O control.

For engineers reviewing the ASSR-4110-003E datasheet, pinout, applications, or equivalent options, key selection criteria include input LED drive compatibility (3 mA min turn-on), output leakage (<1 μA), transient immunity (>1 kV/μs), isolation rating (3750 Vrms), and SO-4 footprint suitability for space-constrained PCB layouts.

Technical Context

The ASSR-4110-003E integrates an AlGaAs infrared LED optically coupled to a high-voltage photovoltaic diode array and MOSFET driver circuit. Its output stage uses two discrete high-voltage MOSFETs configured as a bidirectional SPST switch with no moving parts.

It delivers fast switching (0.25 ms typical T_ON, 0.02 ms typical T_OFF), achieves 3750 V_rms input-output isolation per UL1577, and maintains <0.5 nA output leakage at 400 V and 25°C - enabling reliable operation in safety-critical signal routing where galvanic separation and low off-state current are essential.

Key Specifications

Pinout & Package

ASSR-4110-003E is housed in a 4-pin Small Outline (SO-4) surface-mount package with gull-wing leads. The package measures 4.40 mm × 4.30 mm × 1.78 mm (L×W×H) and features 2.54 mm lead pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLP3558A and VO1263BA, the ASSR-4110-003E offers the fastest turn-off (0.02 ms), lowest thermal resistance in SO-4 form factor, and optimal balance of 400 V rating, 0.12 A load handling, and CMOS-level drive - making it ideal for high-density, high-cycle industrial and telecom control boards.

Availability

ASSR-4110-003E is available at Aetrix Electronics and suitable for telecom interface isolation, industrial PLC I/O modules, medical diagnostic equipment, and security system control panels requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for ASSR-4110-003E 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. is a global semiconductor leader designing high-performance connectivity, networking, and optoelectronic solutions for enterprise, industrial, and communications infrastructure.

The ASSR-41xx Series was developed as general-purpose, Form A solid-state relays targeting EMR replacement in signal and low-power load switching - emphasizing reliability, small footprint, and regulatory-compliant isolation for safety-critical embedded systems.

FAQ

What is the minimum input current required to turn on the ASSR-4110-003E?

The ASSR-4110-003E requires a minimum input current of 3 mA through its internal LED to reliably turn on across the full operating temperature range (–40°C to +85°C). While the device may activate at lower currents (≥0.5 mA), Broadcom specifies 3 mA as the guaranteed turn-on threshold under worst-case conditions. This value ensures robust operation with standard microcontroller GPIO pins and eliminates marginal behavior due to LED aging or temperature drift.

Does the ASSR-4110-003E support AC load switching?

Yes, the ASSR-4110-003E supports bidirectional AC load switching up to 400 V peak. Its output stage consists of two anti-series MOSFETs, enabling conduction in both directions - unlike unidirectional optocouplers. When used with AC loads, the typical on-resistance is 8 Ω, and the device maintains full 400 V withstand capability. No external snubber or polarity protection is needed for standard 120/240 V AC applications.

What is the isolation voltage rating of the ASSR-4110-003E and which standards does it meet?

The ASSR-4110-003E provides 3750 V_rms input-to-output isolation for 1 minute, certified per UL 1577 and CSA Component Acceptance Notice #5. This rating applies to the entire SO-4 package with pins 1–2 shorted (input) and pins 3–4 shorted (output). It satisfies reinforced insulation requirements for functional safety in Class I equipment and is validated for use in medical, telecom, and industrial applications where galvanic separation is mandatory.

Can the ASSR-4110-003E be used in high-speed switching applications?

Yes, the ASSR-4110-003E is optimized for high-speed operation with typical turn-on time of 0.25 ms and turn-off time of 0.02 ms at 25°C. These values remain stable across –40°C to +85°C, making it suitable for programmable logic controllers, data acquisition multiplexing, and test equipment where sub-millisecond channel switching is required. Its fast T_OFF minimizes cross-conduction risk in multi-channel systems.

What is the maximum ambient temperature for continuous operation of the ASSR-4110-003E?

The ASSR-4110-003E is rated for continuous operation from –40°C to +85°C ambient temperature. At +85°C, its maximum average output current is derated to approximately 0.08 A (per Figure 1 in the datasheet), based on thermal equilibrium with a 4-layer PCB. For sustained 0.12 A operation, ambient temperature should be kept below +60°C or heatsinking added to maintain junction temperature ≤125°C.