Broadcom Limited ASSR-1510-503E

Overview

ASSR-1510-503E from Broadcom is a single-channel, normally-off solid-state relay (Photo MOSFET) with optically isolated input and high-voltage MOSFET output stage. It delivers 1.0 A DC output current, 60 V output withstand voltage, and 0.5 Ω max on-resistance at 1 A, designed for industrial control and data acquisition systems requiring reliable, fast-switching isolation.

For engineers reviewing the ASSR-1510-503E datasheet, pinout, applications, or equivalent options, this device serves as a direct replacement for 1 Form A electromechanical relays in space-constrained, high-reliability environments where low EMI, long life, and zero contact bounce are critical.

Technical Context

The ASSR-1510-503E integrates an AlGaAs infrared LED input stage optically coupled to a high-speed photovoltaic diode array and driver circuit that controls two discrete high-voltage MOSFETs. Its output operates as a bidirectional SPST switch with no moving parts, enabling silent, bounce-free switching.

It features galvanic isolation rated at 3750 Vrms per UL1577, with input-to-output capacitance of 0.4 pF and insulation resistance ≥10¹² Ω. The device switches fully on with ≥3 mA LED forward current and turns off when input voltage drops to ≤0.8 V - supporting CMOS-level drive compatibility.

Key Specifications

Pinout & Package

ASSR-1510-503E is housed in a 4-pin SO (Small Outline) surface-mount package with gull-wing leads, RoHS compliant and supplied in tape-and-reel (1500 units/reel). The package measures 4.40 mm × 6.8 mm × 2.0 mm and is optimized for automated assembly and thermal performance on 4-layer PCBs.

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-1510-503E offers the fastest switching (0.27/0.04 ms), lowest typical R_ON (0.2 Ω), and smallest 4-pin SO footprint - making it optimal for high-density, high-cycle industrial modules requiring minimal propagation delay and thermal overhead.

Availability

ASSR-1510-503E is available at Aetrix Electronics and suitable for industrial controls, factory automation, and data acquisition systems requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.

Supply support for ASSR-1510-503E 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-15XX Series was developed to replace electromechanical relays in high-reliability industrial systems - emphasizing speed, isolation integrity, and long-term stability under thermal and electrical stress.

FAQ

What is the minimum input current required to turn on the ASSR-1510-503E?

The ASSR-1510-503E turns on with a minimum input current of 3 mA through its internal AlGaAs LED. While the device may activate at lower currents (≥0.5 mA), Broadcom specifies 3–20 mA as the recommended operating range to ensure reliable switching across –40°C to +85°C. At 5 mA, the ASSR-1510-503E achieves typical turn-on time of 0.27 ms and stable on-resistance of 0.2 Ω.

Can the ASSR-1510-503E switch AC loads?

Yes, the ASSR-1510-503E supports bidirectional AC/DC switching due to its MOSFET-based output architecture. Its 60 V output withstand voltage applies to both polarities, and the device exhibits symmetrical on-resistance and leakage characteristics. However, for sustained AC operation, external snubbers or zero-crossing detection may be needed to manage inductive kickback - the ASSR-1510-503E itself does not include zero-crossing logic.

What is the maximum ambient temperature for continuous 1.0 A operation of the ASSR-1510-503E?

At 1.0 A DC load current, the ASSR-1510-503E must be operated at or below 60°C ambient temperature to remain within safe thermal limits, as shown in Figure 1 of the datasheet. Above 60°C, output current must be linearly derated - e.g., to ~0.7 A at 85°C - to prevent junction temperature exceeding 125°C. PCB layout (e.g., 4-layer copper mass) significantly impacts actual thermal performance.

Does the ASSR-1510-503E require a heat sink?

No, the ASSR-1510-503E does not require an external heat sink under typical operating conditions. With 0.5 Ω max on-resistance and 1.0 A max current, power dissipation remains ≤500 mW - well within the SO-4 package's thermal capability when mounted on standard FR-4 with adequate copper area. Thermal simulation or empirical testing is advised only for sustained 1 A operation at >60°C ambient or in enclosed enclosures.

Is the ASSR-1510-503E qualified for automotive applications?

No, the ASSR-1510-503E is not AEC-Q100 qualified and is explicitly not recommended for automotive applications. Broadcom states in the datasheet that these components "are not to be used in military or aerospace applications or environments" and lack automotive-grade qualification, extended temperature screening, or PPAP documentation. For automotive use, consider Broadcom's AEC-Q100 qualified ASSR-300 series or equivalent alternatives.