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Broadcom Limited ASSR-4118-503E
- Part No.:
- ASSR-4118-503E
- Manufacturer:
- Broadcom Limited
- Category:
- Solid State Relays (SSR)
- Package:
- 4-SOP (0.173", 4.40mm)
- Datasheet:
-
ASSR-4118-503E.pdf
- Description:
- SSR RELAY SPST-NO 100MA 0-400V
- Quantity:
- Payment:
- Shipping:
Inventory:5,168
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Product details
Overview
The ASSR-4118-503E from Broadcom is a single-channel, normally-off solid-state relay (Photo MOSFET) with optically isolated input and high-voltage output switching capability. It features 400 V output withstand voltage, 0.1 A DC current rating, 25 Ω typical on-resistance (AC/DC mode), 3 mA minimum turn-on LED current, and SO-4 surface-mount gull-wing packaging - designed for replacing electromechanical relays in telecom switching and industrial control signal paths.
For engineers reviewing the ASSR-4118-503E datasheet, pinout, applications, or equivalent options, key selection criteria include its 3750 VRMS input-output isolation, low 0.8 V turn-off threshold, compact 4-pin SO package, and compatibility with CMOS-level drive signals in safety-critical, space-constrained PCB layouts.
Technical Context
The ASSR-4118-503E integrates an AlGaAs infrared LED optically coupled to a photovoltaic diode array and dual-MOSFET driver circuit. Its output stage operates as a bidirectional SPST switch with no moving parts, enabling silent, bounce-free operation and >10⁹ cycle lifetime.
It delivers galvanic isolation per UL 1577 (3750 VRMS, 1 min) and CSA Component Acceptance Notice #5, with 4.9 mm minimum clearance and creepage between input and output terminals. The device supports both AC and DC loads but is rated for 0.1 A average output current at TA = 25°C, derating above 40°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Withstand Voltage | 400 V - maximum continuous voltage the output contacts can block without breakdown |
| Output Current Rating | 0.1 A - max average load current at 25°C ambient; derates to zero at 85°C |
| On-Resistance (RON) | 25 Ω typical - determines I²R power loss and voltage drop across closed output |
| Input Turn-On Current | 3 mA - minimum LED forward current required to reliably close the output switch |
| Input Turn-Off Voltage | ≤0.8 V - maximum forward voltage across LED that guarantees output remains open |
| Isolation Voltage | 3750 VRMS - dielectric strength between input and output for safety-critical isolation |
| Package | SO-4 gull-wing - surface-mount, RoHS-compliant, 1500-unit tape-and-reel delivery |
Pinout & Package
ASSR-4118-503E uses a 4-pin Small Outline (SO-4) gull-wing surface-mount package with 2.54 mm lead pitch and 0.20 mm lead thickness. Pin 1 and 2 form the anode/cathode of the input LED; pins 3 and 4 are the bidirectional output terminals. The package meets UL recognition and supports reflow soldering up to 260°C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | LED Anode | Positive input terminal for driving the infrared LED; requires current-limiting resistor |
| Pin 2 | LED Cathode | Ground return path for LED current; referenced to system GND or negative rail |
| Pin 3 | Output Terminal 1 | Bidirectional AC/DC load connection point; electrically isolated from input side |
| Pin 4 | Output Terminal 2 | Second load connection; forms SPST switch with Pin 3 when activated |
Key Features
| Feature | Design Value |
|---|---|
| Optocoupled Photo MOSFET Output | Enables complete galvanic isolation between control and load circuits without transformers or external drivers |
| Single-Pole Single-Throw (SPST) | Provides simple on/off switching for digital control of analog or power signals in Form A relay replacement |
| Low Input Drive Requirement | 3 mA LED current enables direct interface with microcontroller GPIOs or logic buffers without amplification |
| High-Voltage Output Capability | 400 V blocking voltage supports telecom line interface, PLC I/O, and medical equipment signal routing |
| RoHS-Compliant Surface-Mount Package | SO-4 gull-wing footprint simplifies automated assembly and reduces board space vs through-hole DIP alternatives |
Applications
| Telecom Line Switching | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Isolating and routing analog voice/data signals between subscriber line cards and central office switching fabric. IC Role / Device Role / Timing Role: Solid-state relay providing galvanically isolated SPST switching of ±48 V POTS lines. Use Value: Eliminates mechanical relay wear-out and contact bounce while maintaining 400 V withstand for surge protection compliance. |
Use Scenario: Controlling 24 V DC solenoids, indicator lamps, or sensor inputs in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Optically isolated output driver replacing EMRs in DIN-rail mounted I/O modules. Use Value: Enables 0.7 ms turn-on and 0.04 ms turn-off response for fast scan-cycle timing, with no coil inductance delay. |
| Medical Diagnostic Equipment | Security System Control Panels |
Use Scenario: Isolating patient-connected sensor excitation circuits from main processor ground in ECG or EEG front-ends. IC Role / Device Role / Timing Role: Safety-isolated signal path switch meeting IEC 60601 creepage/clearance requirements. Use Value: Provides 4.9 mm minimum creepage and 3750 VRMS isolation to satisfy patient leakage current limits. |
Use Scenario: Managing alarm siren activation, door lock actuation, or motion sensor enable/disable in centralized security hubs. IC Role / Device Role / Timing Role: Low-power, long-life relay substitute for infrequently switched but safety-critical outputs. Use Value: Delivers >10⁹ operational cycles versus ~10⁵ for EMRs, reducing field maintenance in unattended installations. |
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 | 400 V/0.12 A rating; 1.25 V typical VF; SO-6 package with separate LED cathode and output GND | Requires dedicated output ground reference; higher forward voltage demands stronger drive | Preferred where tighter RON tolerance (18 Ω typ.) and integrated snubber are needed for inductive loads |
| Vishay VO1263AAC | 400 V/0.12 A; 0.5 pF CI-O; 0.8 ms TON; 6-pin DIP package with longer creepage (7.1 mm) | Larger footprint; better high-frequency noise immunity due to lower input-output capacitance | Selected when enhanced EMI performance and extended safety spacing are prioritized over board area |
Compared with TLP3548A and VO1263AAC, the ASSR-4118-503E offers the smallest footprint (SO-4), lowest turn-off threshold (≤0.8 V), and highest integration of photovoltaic gate drive - making it optimal for space-constrained, low-drive, high-isolation reliability applications.
Availability
ASSR-4118-503E is available at Aetrix Electronics and suitable for telecom switching, industrial PLC I/O, and medical diagnostic equipment requiring stable component supply, long lifecycle support, and RoHS-compliant surface-mount packaging.
Supply support for ASSR-4118-503E 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, broadband, and optoelectronics solutions for enterprise, data center, and communications markets.
The ASSR-41xx series was developed to replace electromechanical relays in high-reliability, low-maintenance signal routing applications - emphasizing optical isolation integrity, compact packaging, and seamless integration into automated SMT production lines.
FAQ
What is the maximum continuous output voltage the ASSR-4118-503E can block?
The ASSR-4118-503E has a rated output withstand voltage of 400 V, meaning it can continuously block up to ±400 V across its output terminals (pins 3 and 4) under specified operating conditions. This rating applies to both AC and DC waveforms and is validated at TA = 25°C with IO ≤ 250 μA. Transient overvoltage protection should be added in systems exposed to lightning or inductive kickback.
Can the ASSR-4118-503E switch AC loads directly?
Yes, the ASSR-4118-503E supports bidirectional AC load switching because its output consists of two anti-series MOSFETs. It can conduct and block AC waveforms up to 400 V peak-to-peak without polarity constraints. However, its 0.1 A average current rating applies to RMS values, and thermal derating must be applied above 40°C ambient temperature.
What is the minimum LED forward current required to guarantee turn-on of the ASSR-4118-503E?
The ASSR-4118-503E guarantees reliable turn-on with a minimum input LED forward current of 3 mA at TA = 25°C. While the device may activate at lower currents (≥0.5 mA), Broadcom specifies 3 mA as the design threshold to ensure consistent performance across the full –40°C to +85°C operating temperature range and product lifetime.
Does the ASSR-4118-503E require an external gate drive or bias circuit?
No, the ASSR-4118-503E does not require any external gate drive or bias circuit. Its internal photovoltaic diode array generates sufficient gate voltage to fully enhance both output MOSFETs when the input LED is driven with ≥3 mA. Only a series current-limiting resistor is needed on the input side to set IF within the 3–20 mA recommended range.
How is isolation verified for the ASSR-4118-503E, and what safety standards does it meet?
The ASSR-4118-503E is UL recognized per UL 1577 (3750 VRMS, 1 minute) and CSA approved under Component Acceptance Notice #5. Isolation is verified by applying 3750 VRMS between shorted input pins (1+2) and shorted output pins (3+4). It achieves 4.9 mm minimum clearance and creepage, satisfying reinforced insulation requirements for functional safety in industrial and medical end equipment.
ASSR-4118-503E 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)
- Output Type:
- AC, DC
- Voltage - Input:
- 1.3VDC
- Voltage - Load:
- 0 V ~ 400 V
- Load Current:
- 100 mA
- On-State Resistance (Max):
- 35 Ohms
- Termination Style:
- Gull Wing
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 4-SOP (2.54mm)
- Approval Agency:
- CSA, UL
- Grade:
- -
- Qualification:
- -
ASSR-4118-503E FAQ
1.How can I place an order for ASSR-4118-503E through Aetrix?
Please submit a Request for Quotation (RFQ) for ASSR-4118-503E 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-4118-503E reliable?
The price and inventory of ASSR-4118-503E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ASSR-4118-503E is usually 5 days.
3.What payment methods are accepted for ASSR-4118-503E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ASSR-4118-503E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ASSR-4118-503E?
ASSR-4118-503E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ASSR-4118-503E 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-4118-503E?
For technical support, including ASSR-4118-503E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ASSR-4118-503E requirements.
6.How does Aetrix verify that ASSR-4118-503E is sourced from the original manufacturer or authorized distributors?
All ASSR-4118-503E 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-4118-503E meets industry standards.
7.What is the process for return or replacement of ASSR-4118-503E?
All ASSR-4118-503E units undergo pre-shipment inspection (PSI). If there is an issue with ASSR-4118-503E, 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-4118-503E part is unused and in its original packaging.
Return procedure for ASSR-4118-503E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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