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

Broadcom Limited ASSR-1228-302E

Name: ASSR-1228-302E
Brand: Broadcom Limited
SKU: ASSR-1228-302E
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ASSR-1228-302E

Manufacturer:: Broadcom Limited

Category:: Solid State Relays (SSR)

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

Datasheet:: ASSR-1228-302E.pdf

Description:: SSR RELAY SPST-NO 200MA 0-60V

Quantity:: RFQ Add To RFQ list

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Inventory:13,689

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Product details

Overview

ASSR-1228-302E from Broadcom is a dual-channel, normally-off, solid-state relay (Photo MOSFET) with optically isolated input and high-voltage MOSFET output stages. It provides 60 V output withstand voltage, 0.2 A average output current per channel, <10 Ω typical on-resistance, and 3750 V_rms input-output isolation for industrial control and telecom switching applications.

For engineers reviewing the ASSR-1228-302E datasheet, pinout, applications, or equivalent options, key selection criteria include dual SPST Form A functionality, gull-wing DIP-8 surface-mount package, CMOS-compatible 3 mA turn-on threshold, low leakage (<1 µA), and UL/CSA safety certification for reinforced insulation.

Technical Context

The ASSR-1228-302E integrates an AlGaAs infrared LED optically coupled to a photovoltaic diode array and dual-MOSFET driver circuitry-enabling independent, bidirectional switching of two isolated 60 V/0.2 A DC or AC/DC loads. Its turn-on is triggered at ≥3 mA input current; turn-off occurs at ≤0.8 V forward voltage across the LED.

It uses internal high-speed photovoltaic generation to drive two discrete high-voltage MOSFETs without external bias, delivering galvanic isolation compliant with UL1577 (3750 V_rms/1 min) and CSA Component Acceptance Notice #5. Input-output creepage is 7.4 mm and clearance is 7.1 mm in the DIP-8 package.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Configuration	Dual SPST (2 Form A), independent channels
Output Withstand Voltage	60 V - maximum continuous voltage across output terminals without breakdown
Average Output Current	0.2 A per channel - derated above 25°C ambient per Figure 4
On-Resistance (R_ON)	≤10 Ω - measured at 5 mA input, 200 mA pulsed output (≤30 ms)
Input Turn-On Threshold	3 mA - minimum LED current to reliably close both output switches
Isolation Voltage	3750 V_rms/1 min - dielectric strength between input and output sides
Input-Output Capacitance	0.8 pF - ultra-low coupling enables high-speed signal integrity in noise-sensitive systems

Pinout & Package

ASSR-1228-302E is housed in a gull-wing surface-mount 300-mil DIP-8 package (8-pin dual in-line, lead pitch 2.54 mm), optimized for automated assembly and high-density PCB layouts.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4	Input Anode/Cathode (LED array)	Pins 1–2 and 3–4 form two parallel LED inputs - each channel driven independently; common cathode configuration per channel
5, 6, 7, 8	Output Drain/Source (MOSFET pairs)	Pins 5–6 and 7–8 are isolated output switch pairs - each pair functions as one SPST contact; no internal connection between channels

Key Features

Feature	Design Value
Dual-channel SPST relay replacement	Replaces two electromechanical relays with zero bounce, >10⁹ cycle lifetime, and no contact arcing
CMOS-compatible input drive	Turns on with only 3 mA - directly drivable by microcontrollers, FPGAs, and logic gates without buffer stages
Reinforced safety isolation	3750 V_rms withstand, 7.4 mm creepage, IIIa insulation group - meets end-equipment requirements for industrial and medical systems
Low-output leakage	<1 µA at 60 V - ensures reliable off-state blocking in high-impedance sensing and battery-backed circuits
Gull-wing SMT package	300-mil DIP-8 footprint with J-bend leads - compatible with standard reflow profiles and AOI inspection

Applications

Telecom Line Switching	Industrial PLC I/O Modules
Use Scenario: Isolating and routing analog/digital signals between central office equipment and subscriber line cards under surge-prone conditions. IC Role / Device Role / Timing Role: Solid-state relay providing galvanically isolated, bounce-free switching of POTS, DSL, or VoIP line interfaces. Use Value: Eliminates mechanical wear and EMI from contact arcing while maintaining 60 V withstand capability for longitudinal fault protection.	Use Scenario: Controlling 24 V DC solenoids, indicator lamps, or sensor power rails in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Dual-channel load switch enabling independent, fail-safe activation of field devices with reinforced isolation. Use Value: Supports SIL-2 functional safety architecture via certified 3750 V_rms isolation and predictable <5 ms switching times.
Medical Diagnostic Equipment	Security System Zone Monitoring
Use Scenario: Isolating patient-connected sensor excitation circuits from main system ground in ECG, EEG, or infusion pump controllers. IC Role / Device Role / Timing Role: Safety-isolated SPST switch decoupling measurement front-ends from digital control logic. Use Value: Meets IEC 60601-1 creepage/clearance requirements (7.4 mm creepage) and limits leakage to <1 µA for patient safety.	Use Scenario: Supervising multiple door/window contact loops in access control panels where false triggers must be avoided. IC Role / Device Role / Timing Role: Low-leakage, high-withstand solid-state switch isolating zone inputs from MCU GPIOs. Use Value: Prevents false alarms caused by moisture-induced leakage - <1 µA off-state current ensures stable open-circuit detection.

Telecom Line Switching

Industrial PLC I/O Modules

Use Scenario: Isolating and routing analog/digital signals between central office equipment and subscriber line cards under surge-prone conditions.

IC Role / Device Role / Timing Role: Solid-state relay providing galvanically isolated, bounce-free switching of POTS, DSL, or VoIP line interfaces.

Use Value: Eliminates mechanical wear and EMI from contact arcing while maintaining 60 V withstand capability for longitudinal fault protection.

Use Scenario: Controlling 24 V DC solenoids, indicator lamps, or sensor power rails in programmable logic controller backplanes.

IC Role / Device Role / Timing Role: Dual-channel load switch enabling independent, fail-safe activation of field devices with reinforced isolation.

Use Value: Supports SIL-2 functional safety architecture via certified 3750 V_rms isolation and predictable <5 ms switching times.

Medical Diagnostic Equipment

Security System Zone Monitoring

Use Scenario: Isolating patient-connected sensor excitation circuits from main system ground in ECG, EEG, or infusion pump controllers.

IC Role / Device Role / Timing Role: Safety-isolated SPST switch decoupling measurement front-ends from digital control logic.

Use Value: Meets IEC 60601-1 creepage/clearance requirements (7.4 mm creepage) and limits leakage to <1 µA for patient safety.

Use Scenario: Supervising multiple door/window contact loops in access control panels where false triggers must be avoided.

IC Role / Device Role / Timing Role: Low-leakage, high-withstand solid-state switch isolating zone inputs from MCU GPIOs.

Use Value: Prevents false alarms caused by moisture-induced leakage - <1 µA off-state current ensures stable open-circuit detection.

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 TLP3548A	Dual-channel, 60 V/0.2 A, SOIC-8 package; 5000 V_rms isolation but higher R_ON (15 Ω typ)	Better isolation rating but larger on-resistance limits use in high-current analog paths	Select when higher isolation voltage is prioritized over conduction loss
Vishay VO3120	Single-channel, 60 V/0.12 A, DIP-6; lower current rating and no dual-channel integration	Requires two units to match ASSR-1228-302E's dual functionality - increases board area and BOM count	Select when single-channel operation suffices and legacy DIP-6 footprint is required

Compared with TLP3548A and VO3120, the ASSR-1228-302E uniquely delivers dual SPST switching in a single gull-wing DIP-8 package with 3 mA CMOS-compatible drive, making it optimal for space-constrained industrial and telecom modules requiring coordinated load control.

Availability

ASSR-1228-302E is available at Aetrix Electronics and suitable for industrial controls, telecommunications infrastructure, medical diagnostics, and security system design requiring stable component supply, long-lifecycle support, and RoHS-compliant manufacturing.

Supply support for ASSR-1228-302E 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, infrastructure, and optoelectronic solutions for enterprise, industrial, and communications markets.

The ASSR-12XX series was developed as a family of optically isolated solid-state relays targeting EMR replacement in noise-sensitive, high-reliability applications-emphasizing low drive current, fast switching, and regulatory-certified isolation.

FAQ

What is the maximum operating temperature for the ASSR-1228-302E?

The ASSR-1228-302E has a specified operating temperature range of –40°C to +85°C. Its junction temperature must not exceed 125°C under steady-state conditions. Derating curves in the datasheet (Figure 4) define allowable output current versus ambient temperature to ensure thermal compliance - for example, at 85°C ambient, maximum average output current drops to ~0.12 A per channel.

Does the ASSR-1228-302E support AC load switching?

Yes, the ASSR-1228-302E supports both AC and DC loads up to 60 V peak. Its MOSFET output stage is bidirectional, enabling zero-crossing–free switching of AC signals. However, its 0.2 A rating applies to RMS current for AC loads; for sustained AC operation, thermal derating per Figure 4 must be observed to prevent junction overheating.

What is the input-to-output capacitance of the ASSR-1228-302E?

Per the Broadcom datasheet (AV02-0173EN, page 11), the ASSR-1228-302E has a typical input-output capacitance (C_I-O) of 0.8 pF at 1 MHz and 0 V bias. This ultra-low value minimizes capacitive coupling noise between control and load domains - critical for precision analog signal routing and high-speed digital isolation.

Can the ASSR-1228-302E replace two separate ASSR-1218 devices?

Yes - the ASSR-1228-302E integrates two independent SPST switches in one package, matching the combined functionality of two ASSR-1218 units. Both share identical 60 V/0.2 A ratings, 3 mA turn-on threshold, and 3750 V_rms isolation. The ASSR-1228-302E saves PCB area and simplifies layout versus dual ASSR-1218 SO-4 placements, especially in gull-wing DIP-8 constrained designs.

Is the ASSR-1228-302E automotive qualified?

No, the ASSR-1228-302E is not AEC-Q100 qualified and is explicitly not recommended for automotive applications per the Broadcom datasheet (page 2). It is rated for industrial and commercial use only, with operating temperature limited to –40°C to +85°C and no qualification for automotive vibration, extended temperature, or EMC stress testing.

ASSR-1228-302E Specifications

Product attributes: Attribute value

Manufacturer:: Broadcom Limited

Series:: ASSR

Packaging:: Tube

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:: 200 mA

On-State Resistance (Max):: 10 Ohms

Termination Style:: Gull Wing

Operating Temperature:: -40°C ~ 85°C

Supplier Device Package:: 8-DIP Gull Wing

Approval Agency:: CSA, UL

Grade:: -

Qualification:: -

ASSR-1228-302E FAQ

1.How can I place an order for ASSR-1228-302E through Aetrix?

Please submit a Request for Quotation (RFQ) for ASSR-1228-302E 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-1228-302E reliable?

The price and inventory of ASSR-1228-302E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ASSR-1228-302E is usually 5 days.

3.What payment methods are accepted for ASSR-1228-302E?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ASSR-1228-302E transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ASSR-1228-302E?

ASSR-1228-302E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ASSR-1228-302E 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-1228-302E?

For technical support, including ASSR-1228-302E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ASSR-1228-302E requirements.

6.How does Aetrix verify that ASSR-1228-302E is sourced from the original manufacturer or authorized distributors?

All ASSR-1228-302E 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-1228-302E meets industry standards.

7.What is the process for return or replacement of ASSR-1228-302E?

All ASSR-1228-302E units undergo pre-shipment inspection (PSI). If there is an issue with ASSR-1228-302E, 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-1228-302E part is unused and in its original packaging.

Return procedure for ASSR-1228-302E:

1.Submit a request within 90 days.

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

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