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Home > Products > Relays > Solid State Relays (SSR)

Broadcom Limited ASSR-1520-502E

Name: ASSR-1520-502E
Brand: Broadcom Limited
SKU: ASSR-1520-502E
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ASSR-1520-502E

Manufacturer:: Broadcom Limited

Category:: Solid State Relays (SSR)

Package:: 8-SMD (0.300", 7.62mm)

Datasheet:: ASSR-1520-502E.pdf

Description:: SSR RELAY SPST-NO 1A 0-60V

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Product details

Overview

The ASSR-1520-502E from Broadcom is a dual-channel, normally-off, solid-state SPST relay (Photo MOSFET) with 60 V output withstand voltage, 1.0 A DC output current rating, and 0.2 Ω typical on-resistance at 25°C - designed for industrial control signal switching where electromechanical relay replacement is required.

For engineers reviewing the ASSR-1520-502E datasheet, pinout, applications, or equivalent options, key selection criteria include input LED drive compatibility (3 mA min turn-on), high-speed switching (0.27 ms typical t_ON), 3750 V_rms input-output isolation, and DIP-8 gull-wing surface-mount packaging for automated assembly in factory automation and data acquisition systems.

Technical Context

The ASSR-1520-502E integrates an AlGaAs infrared LED optically coupled to a high-voltage detector circuit containing a photovoltaic diode array and driver that controls two discrete high-voltage MOSFETs per channel. It operates as a bidirectional, zero-crossing–independent solid-state switch with no moving parts.

Its dual-channel architecture provides independent SPST switching paths with shared input-side logic and isolated output-side terminals; each channel supports AC/DC loads up to 60 V and 1.0 A, with output leakage <1 μA and transient immunity >7 kV/μs (dV_O/dt).

Key Specifications

Parameter	Value and Actual Design Meaning
Output Withstand Voltage	60 V - maximum continuous voltage across output terminals before breakdown; requires external overvoltage protection for transients exceeding this rating.
Max Output Current (DC)	1.0 A - rated at TA = 25°C, pulse ≤30 ms; derates to ~0.8 A at 85°C ambient per Figure 4.
On-Resistance (R_ON)	0.2 Ω typical - measured at IF = 5 mA, IO = 1 A, pulse ≤30 ms; enables low conduction loss (<200 mW at 1 A).
Turn-On Time (t_ON)	0.27 ms typical - time from 10% to 90% of output current rise with IF = 5 mA; supports high-cycle switching in PLC I/O modules.
Input-Output Isolation	3750 V_rms/1 min - UL1577 recognized; ensures safety-critical separation between control logic and load circuits.
Input Turn-On Threshold	3 mA - minimum forward current required to reliably close output contacts; compatible with CMOS/TTL logic drivers.
Operating Temperature	–40°C to +85°C - specified performance range for industrial environments without derating penalties below 85°C.

Pinout & Package

ASSR-1520-502E uses an 8-pin DIP package with gull-wing surface-mount leads (300-mil width), optimized for reflow soldering per JEDEC J-STD-020. Pin 1–4 form the input LED anode/cathode pair per channel; pins 5–8 are the isolated output terminals (two independent SPST switches).

Pin/Terminal	Circuit Role	Design Meaning
1, 2	Channel 1 LED Anode / Cathode	Optical input for first SPST switch; requires ≥3 mA forward current to activate.
3, 4	Channel 2 LED Anode / Cathode	Independent optical input for second SPST switch; electrically isolated from Channel 1 input.
5, 6	Channel 1 Output Source / Drain	Bidirectional output path; connects when Channel 1 LED is energized; rated 60 V/1.0 A.
7, 8	Channel 2 Output Source / Drain	Second isolated output path; shares same voltage/current ratings and switching behavior as pins 5–6.

Key Features

Feature	Design Value
Dual SPST relay replacement	Two independent, isolated output channels replace two 1 Form A EMRs - reduces board space and eliminates mechanical wear.
Low on-resistance	0.2 Ω typical R_ON minimizes I²R heating and voltage drop in 1 A load paths, enabling compact thermal design.
High-speed switching	0.27 ms t_ON/0.04 ms t_OFF enables real-time control loop response in data acquisition and test equipment.
High transient immunity	7 kV/μs dV_O/dt rating suppresses false triggering from EFT/burst noise in industrial power environments.
UL/CSA safety certification	3750 V_rms isolation per UL1577 and CSA Component Acceptance #5 - satisfies functional safety requirements for Class I equipment.

Applications

Industrial PLC I/O Modules	Data Acquisition Front-Ends
Use Scenario: Isolating digital control signals from 24 V DC field actuators in programmable logic controller racks. IC Role / Device Role / Timing Role: Dual-channel solid-state relay providing galvanically isolated, bounce-free switching of solenoid valves and indicator lamps. Use Value: Eliminates contact arcing and maintenance downtime associated with EMRs while supporting >10⁶ switching cycles at 10 Hz.	Use Scenario: Multiplexing sensor excitation and signal return paths in multi-channel precision measurement systems. IC Role / Device Role / Timing Role: Bidirectional analog/digital signal switch routing calibrated reference voltages or thermocouple inputs to ADC front-ends. Use Value: 0.2 Ω R_ON and <1 μA leakage preserve measurement accuracy; 3750 V_rms isolation prevents ground-loop errors.
Factory Automation Safety Interlocks	Medical Instrument Signal Routing
Use Scenario: Enabling/disabling motor drives and emergency stop circuits in ISO 13849-compliant machinery control panels. IC Role / Device Role / Timing Role: Fail-safe output stage that de-energizes loads within <1 ms upon control signal removal. Use Value: 0.04 ms t_OFF meets Category 3 response time requirements; reinforced insulation supports PL e performance level.	Use Scenario: Switching patient-connected analog biosignals (ECG, EEG) between diagnostic sensors and amplifier chains. IC Role / Device Role / Timing Role: Medical-grade isolated signal path with leakage <1 μA and CTI ≥175 V to meet IEC 60601-1 creepage/clearance mandates. Use Value: 4.8 mm minimum creepage and IIIa insulation group ensure patient safety compliance without additional barrier components.

Industrial PLC I/O Modules

Data Acquisition Front-Ends

Use Scenario: Isolating digital control signals from 24 V DC field actuators in programmable logic controller racks.

IC Role / Device Role / Timing Role: Dual-channel solid-state relay providing galvanically isolated, bounce-free switching of solenoid valves and indicator lamps.

Use Value: Eliminates contact arcing and maintenance downtime associated with EMRs while supporting >10⁶ switching cycles at 10 Hz.

Use Scenario: Multiplexing sensor excitation and signal return paths in multi-channel precision measurement systems.

IC Role / Device Role / Timing Role: Bidirectional analog/digital signal switch routing calibrated reference voltages or thermocouple inputs to ADC front-ends.

Use Value: 0.2 Ω R_ON and <1 μA leakage preserve measurement accuracy; 3750 V_rms isolation prevents ground-loop errors.

Factory Automation Safety Interlocks

Medical Instrument Signal Routing

Use Scenario: Enabling/disabling motor drives and emergency stop circuits in ISO 13849-compliant machinery control panels.

IC Role / Device Role / Timing Role: Fail-safe output stage that de-energizes loads within <1 ms upon control signal removal.

Use Value: 0.04 ms t_OFF meets Category 3 response time requirements; reinforced insulation supports PL e performance level.

Use Scenario: Switching patient-connected analog biosignals (ECG, EEG) between diagnostic sensors and amplifier chains.

IC Role / Device Role / Timing Role: Medical-grade isolated signal path with leakage <1 μA and CTI ≥175 V to meet IEC 60601-1 creepage/clearance mandates.

Use Value: 4.8 mm minimum creepage and IIIa insulation group ensure patient safety compliance without additional barrier components.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Toshiba TLP3558A	Single-channel, 60 V/1.2 A, SO-6 package; 0.15 Ω R_ON; 3750 V_rms isolation.	Lacks dual-channel integration; requires two devices for ASSR-1520-502E's functionality.	Select when board space permits discrete channel layout and lower R_ON is prioritized over channel count.
Vishay VO615A-3X006	Dual-channel, 60 V/0.5 A, DIP-8; 0.5 Ω R_ON; 5000 V_rms isolation; slower t_ON (0.8 ms).	Lower current rating and higher on-resistance limit use in 1 A load paths.	Choose for higher isolation voltage requirements where speed and conduction loss are secondary.

Compared with TLP3558A and VO615A-3X006, the ASSR-1520-502E uniquely delivers dual 1.0 A SPST switching in one DIP-8 package with best-in-class 0.27 ms turn-on speed and 0.2 Ω on-resistance - optimizing PCB area, thermal performance, and real-time responsiveness in industrial control designs.

Availability

ASSR-1520-502E is available at Aetrix Electronics and suitable for industrial controls, factory automation, and data acquisition systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant surface-mount packaging.

Supply support for ASSR-1520-502E 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 optoelectronics solutions for enterprise, industrial, and communications markets.

The ASSR-15XX Series was developed to replace electromechanical relays in high-reliability industrial signal routing, emphasizing low drive current, fast switching, and certified safety isolation for harsh operating environments.

FAQ

What is the maximum continuous output current rating for ASSR-1520-502E at 85°C ambient temperature?

The ASSR-1520-502E supports up to 0.8 A continuous output current at TA = 85°C, as shown in Figure 4 of the AV02-0036EN datasheet. This derating ensures junction temperature remains below 125°C under worst-case thermal conditions. The 1.0 A rating applies only at TA = 25°C with pulsed operation (≤30 ms). For sustained DC loads at elevated temperatures, thermal design must account for this reduction to avoid exceeding R_ON-limited power dissipation in the ASSR-1520-502E.

Does ASSR-1520-502E support AC load switching, and what are the voltage limitations?

Yes, the ASSR-1520-502E supports bidirectional AC load switching up to 60 V peak (±60 V), as confirmed in the Recommended Operating Conditions table for ASSR-1511 Connection A - which applies identically to ASSR-1520-502E per the family-wide specification. However, it does not provide zero-crossing detection; therefore, turn-on may occur at any phase angle, potentially causing inrush current in capacitive loads. For reliable AC switching, external snubbers or timing control should be used. The ASSR-1520-502E maintains its 60 V withstand rating and 1.0 A current capability under AC conditions.

What is the input LED forward voltage range for ASSR-1520-502E at 5 mA drive current?

At IF = 5 mA, the ASSR-1520-502E exhibits a forward voltage (V_F) range of 1.1 V (min) to 1.65 V (max), with 1.3 V typical, per the Electrical Specifications table. This range is stable across the full operating temperature range (–40°C to +85°C), as verified in Figure 7. Designers should size current-limiting resistors accordingly - for example, with a 3.3 V logic supply, a 470 Ω resistor delivers ~4.7 mA at V_F = 1.3 V, ensuring reliable turn-on while staying within the 25 mA absolute maximum rating. This V_F behavior is intrinsic to the AlGaAs LED in the ASSR-1520-502E.

Can ASSR-1520-502E be used in medical equipment, and what safety certifications apply?

The ASSR-1520-502E carries UL1577 recognition (3750 V_rms/1 min) and CSA Component Acceptance #5, with minimum creepage (4.8 mm) and clearance (4.9 mm) meeting IEC 60601-1 requirements for patient-connected medical devices when properly implemented in PCB layout. However, it is explicitly excluded from military/aerospace use and is not AEC-Q100 qualified. Its IIIa insulation group and CTI ≥175 V support Class I, Type BF application safety - but final system-level certification requires validation of the complete end-equipment design. The ASSR-1520-502E itself is not medically certified out-of-box.

How does the turn-on time of ASSR-1520-502E change with input current and temperature?

The ASSR-1520-502E turn-on time (t_ON) decreases with higher input current and increases slightly with rising temperature: at IF = 5 mA, t_ON is 0.27 ms typical at 25°C but rises to ~0.4 ms at 85°C (Figure 12); at IF = 10 mA, t_ON improves to 0.13 ms typical at 25°C and ~0.25 ms at 85°C (Figure 11). This behavior results from photovoltaic charge accumulation dynamics in the detector circuit. Designers can optimize speed by driving the ASSR-1520-502E LED at 10 mA - provided power dissipation limits (80 mW max) are observed - especially in time-critical data acquisition applications.

ASSR-1520-502E Specifications

Product attributes: Attribute value

Manufacturer:: Broadcom Limited

Series:: ASSR

Packaging:: Tape & Reel (TR)

Product Status:: Active

Mounting Type:: Surface Mount

Circuit:: SPST-NO (1 Form A) x 2

Output Type:: AC, DC

Voltage - Input:: 1.3VDC

Voltage - Load:: 0 V ~ 60 V

Load Current:: 1 A

On-State Resistance (Max):: 500 mOhms

Termination Style:: Gull Wing

Operating Temperature:: -40°C ~ 85°C

Supplier Device Package:: 8-DIP Gull Wing

Approval Agency:: CSA, UL

Grade:: -

Qualification:: -

ASSR-1520-502E FAQ

1.How can I place an order for ASSR-1520-502E through Aetrix?

Please submit a Request for Quotation (RFQ) for ASSR-1520-502E on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for ASSR-1520-502E reliable?

The price and inventory of ASSR-1520-502E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ASSR-1520-502E is usually 5 days.

3.What payment methods are accepted for ASSR-1520-502E?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ASSR-1520-502E transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ASSR-1520-502E?

ASSR-1520-502E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ASSR-1520-502E order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for ASSR-1520-502E?

For technical support, including ASSR-1520-502E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ASSR-1520-502E requirements.

6.How does Aetrix verify that ASSR-1520-502E is sourced from the original manufacturer or authorized distributors?

All ASSR-1520-502E products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ASSR-1520-502E meets industry standards.

7.What is the process for return or replacement of ASSR-1520-502E?

All ASSR-1520-502E units undergo pre-shipment inspection (PSI). If there is an issue with ASSR-1520-502E, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The ASSR-1520-502E part is unused and in its original packaging.

Return procedure for ASSR-1520-502E:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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