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Broadcom Limited ASSR-4120-502E
- Part No.:
- ASSR-4120-502E
- Manufacturer:
- Broadcom Limited
- Category:
- Solid State Relays (SSR)
- Package:
- 8-SMD (0.300", 7.62mm)
- Datasheet:
-
ASSR-4120-502E.pdf
- Description:
- SSR RELAY SPST-NO 120MA 0-400V
- Quantity:
- Payment:
- Shipping:
Inventory:1,825
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Product details
Overview
The ASSR-4120-502E from Broadcom is a dual-channel, normally-off, solid-state relay (Photo MOSFET) with optically isolated input and high-voltage MOSFET output stages. It delivers 400 V output withstand voltage, 0.12 A average output current per channel, 16 Ω typical on-resistance at 25°C, and operates across –40°C to +85°C for industrial signal switching and low-power AC/DC load control.
For engineers reviewing the ASSR-4120-502E datasheet, pinout, applications, or equivalent options, key selection considerations include dual SPST Form A relay equivalence, 3750 Vrms input-output isolation, gull-wing surface-mount DIP-8 packaging, and fast 0.25 ms turn-on / 0.02 ms turn-off timing under 5 mA drive.
Technical Context
The ASSR-4120-502E integrates an AlGaAs infrared LED input stage optically coupled to two independent high-voltage MOSFET output switches, each with dedicated photovoltaic diode array and driver circuitry. Its dual-channel architecture enables simultaneous, isolated control of two independent loads without shared conduction paths.
It functions as a bidirectional, zero-crossing–agnostic signal switch with CMOS-compatible 3 mA minimum turn-on current and 0.8 V maximum turn-off voltage. Input-output insulation meets UL1577 (3750 Vrms/1 min) and CSA Component Acceptance #5, supporting safety-critical industrial and medical applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Withstand Voltage | 400 V - Maximum continuous voltage the output terminals can block without breakdown. |
| Average Output Current | 0.12 A per channel - Sustained DC load current capability at TA = 25°C with thermal derating above ambient. |
| On-Resistance (RON) | 16 Ω typical - Output conduction loss directly impacts power dissipation and voltage drop under load. |
| Turn-On Time (tON) | 0.25 ms typical - Critical for high-speed digital switching and pulse-width modulated load control. |
| Turn-Off Time (tOFF) | 0.02 ms typical - Enables rapid channel disablement and reduces cross-conduction risk in multi-relay systems. |
| Input-Output Isolation | 3750 Vrms - Ensures galvanic separation between control and load circuits for safety and noise immunity. |
| Operating Temperature | –40°C to +85°C - Validated performance range for deployment in harsh industrial environments. |
Pinout & Package
ASSR-4120-502E uses an 8-pin DIP package with gull-wing surface-mount leads (300-mil body width), optimized for automated assembly and board-level reliability. The package provides 7.1 mm minimum creepage and 7.4 mm minimum clearance between input and output sides.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | Input Anode/Cathode (LED Array) | Collectively form the input LED cathode (pins 1–4 shorted internally) and anode (pin 2 only used externally); requires ≥3 mA forward current to activate both channels. |
| 5, 6, 7, 8 | Output Source/Drain (MOSFET Pair) | Pins 5–6 and 7–8 are independent SPST output pairs; each pair supports bidirectional AC/DC switching up to 400 V and 0.12 A. |
Key Features
| Feature | Design Value |
|---|---|
| Dual SPST Form A Relay Equivalence | Replaces two electromechanical relays with independent, bounce-free, wear-free switching in one compact DIP-8 footprint. |
| High-Speed Switching | 0.25 ms tON/0.02 ms tOFF enables use in data acquisition multiplexing and programmable logic controller (PLC) I/O modules requiring sub-millisecond response. |
| CMOS-Compatible Input Drive | 3 mA minimum turn-on current allows direct interfacing with microcontroller GPIOs without external driver transistors. |
| High Transient Immunity | >1 kV/μs dV/dt rejection protects against EFT and surge-induced false triggering in noisy industrial settings. |
| UL1577 & CSA Safety Certification | 3750 Vrms isolation rating qualifies ASSR-4120-502E for use in Class I and Class II equipment requiring reinforced insulation. |
Applications
| Telecom Signal Routing | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Selecting analog voice/data paths in carrier-grade access equipment and remote terminal units. IC Role / Device Role / Timing Role: Dual-channel solid-state relay providing isolated, low-leakage (<1 μA), bidirectional signal switching with 0.25 ms settling time. Use Value: Eliminates mechanical relay wear and contact oxidation, ensuring >109 operations lifetime and stable impedance matching over temperature. | Use Scenario: Controlling solenoids, indicator lamps, and small AC actuators in modular automation controllers. IC Role / Device Role / Timing Role: Optically isolated, dual SPST switch enabling safe 24 VDC/120 VAC load control from low-voltage logic. Use Value: Delivers 400 V blocking capability and 0.12 A per channel current handling without snubbers or flyback diodes. |
| Medical Diagnostic Instrumentation | Security System Panel Interfaces |
Use Scenario: Isolating sensor excitation lines and analog front-end multiplexing in portable ultrasound and ECG devices. IC Role / Device Role / Timing Role: High-isolation (3750 Vrms), low-offset (<1 μV) solid-state switch for precision signal path selection. Use Value: Meets IEC 60601-1 patient isolation requirements while minimizing signal distortion and crosstalk between channels. | Use Scenario: Managing zone inputs, alarm outputs, and keypad backlighting in fire/alarm control panels. IC Role / Device Role / Timing Role: Dual-channel, fail-safe (normally open) relay replacement with fast fault-clearing response. Use Value: Provides certified safety isolation and eliminates relay chatter during battery backup transitions and ESD events. |
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, 600 V/0.4 A, SO-6 package; higher current but no dual-channel integration. | Requires two devices to match ASSR-4120-502E's dual SPST functionality; larger PCB area and higher BOM count. | Select when higher single-channel current (0.4 A) or 600 V blocking is required, and board space permits discrete implementation. |
| Vishay VO615A-3X006 | Dual-channel, 400 V/0.12 A, DIP-8; slower switching (tON = 2 ms typical) and lower isolation (5000 Vrms but not UL-recognized). | Lacks UL1577 certification and exhibits 8× longer turn-on time-unsuitable for high-speed data routing or real-time control. | Consider only for cost-sensitive, non-safety-critical AC load switching where speed and regulatory compliance are secondary. |
Compared with TLP3558A and VO615A-3X006, the ASSR-4120-502E uniquely combines dual-channel integration, UL-recognized 3750 Vrms isolation, and sub-0.3 ms switching in a gull-wing DIP-8 package-making it optimal for space-constrained, safety-compliant, high-speed industrial and medical control designs.
Availability
ASSR-4120-502E is available at Aetrix Electronics and suitable for industrial PLC I/O modules, telecom signal routing, medical diagnostic instrumentation, and security system panel interfaces requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for ASSR-4120-502E 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 designing high-performance connectivity, infrastructure, and optoelectronic solutions for enterprise, industrial, and communications markets.
The ASSR-41xx Series was developed as general-purpose, Form A solid-state relays to replace electromechanical and reed relays in signal switching and low-power load control applications demanding reliability, speed, and safety-certified isolation.
FAQ
What is the maximum operating temperature for the ASSR-4120-502E?
The ASSR-4120-502E is specified to operate continuously from –40°C to +85°C ambient temperature. Its junction temperature must remain ≤125°C under load; derating curves in the datasheet (Figure 4) define maximum allowable output current versus ambient temperature to ensure thermal safety. This range supports deployment in uncontrolled industrial enclosures and outdoor telecom cabinets.
Does the ASSR-4120-502E support AC and DC loads on the same output channel?
Yes, the ASSR-4120-502E supports bidirectional AC and DC loads on each output channel (pins 5–6 and 7–8). Its Photo MOSFET architecture has no polarity dependence, enabling true AC/DC switching up to 400 V peak and 0.12 A average per channel. No external components are needed for AC operation, unlike TRIAC-based SSRs.
What is the minimum input current required to turn on the ASSR-4120-502E?
The ASSR-4120-502E turns on with a minimum input current of 3 mA through its integrated AlGaAs LED input stage. For guaranteed performance across –40°C to +85°C, Broadcom recommends operating at 5–10 mA. The device remains fully off when input voltage is ≤0.8 V, enabling clean digital control from standard logic families.
Is the ASSR-4120-502E RoHS compliant and lead-free?
Yes, the ASSR-4120-502E is RoHS compliant and lead-free, as indicated by the "E" suffix in the part number. It conforms to EU Directive 2011/65/EU and uses lead-free terminations compatible with standard Pb-free reflow profiles (peak 260°C for 10 s). The device also complies with Broadcom's halogen-free material requirements.
How does the ASSR-4120-502E achieve its 3750 Vrms isolation rating?
The ASSR-4120-502E achieves 3750 Vrms input-output isolation via internal optocoupling: an AlGaAs LED emits infrared light across a molded plastic barrier to a photovoltaic diode array that drives the output MOSFETs. This physical separation, combined with ≥7.1 mm creepage and ≥7.4 mm clearance in the DIP-8 package, satisfies UL1577 and CSA Component Acceptance #5 requirements.
ASSR-4120-502E 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 ~ 400 V
- Load Current:
- 120 mA
- On-State Resistance (Max):
- 25 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-4120-502E FAQ
1.How can I place an order for ASSR-4120-502E through Aetrix?
Please submit a Request for Quotation (RFQ) for ASSR-4120-502E 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-4120-502E reliable?
The price and inventory of ASSR-4120-502E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ASSR-4120-502E is usually 5 days.
3.What payment methods are accepted for ASSR-4120-502E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ASSR-4120-502E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ASSR-4120-502E?
ASSR-4120-502E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ASSR-4120-502E 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-4120-502E?
For technical support, including ASSR-4120-502E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ASSR-4120-502E requirements.
6.How does Aetrix verify that ASSR-4120-502E is sourced from the original manufacturer or authorized distributors?
All ASSR-4120-502E 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-4120-502E meets industry standards.
7.What is the process for return or replacement of ASSR-4120-502E?
All ASSR-4120-502E units undergo pre-shipment inspection (PSI). If there is an issue with ASSR-4120-502E, 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-4120-502E part is unused and in its original packaging.
Return procedure for ASSR-4120-502E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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