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Broadcom Limited ASSR-3211-301E
- Part No.:
- ASSR-3211-301E
- Manufacturer:
- Broadcom Limited
- Category:
- Solid State Relays (SSR)
- Package:
- 6-SMD (0.300", 7.62mm)
- Datasheet:
-
ASSR-3211-301E.pdf
- Description:
- SSR RELAY SPST-NO 200MA 0-250V
- Quantity:
- Payment:
- Shipping:
Inventory:4,600
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Product details
Overview
ASSR-3211-301E from Broadcom is a single-channel, normally-off, Form A solid-state relay (Photo MOSFET) with optically isolated AlGaAs LED input and dual high-voltage MOSFET output stage. It delivers 250 V output withstand voltage, 0.2 A AC/DC current rating (0.4 A in DC-only Connection B), 8 Ω typical on-resistance (2.5 Ω in DC-only mode), and switching speeds of 0.25 ms turn-on / 0.02 ms turn-off - used for replacing electromechanical relays in telecom signal routing and industrial control I/O isolation.
For engineers reviewing the ASSR-3211-301E datasheet, pinout, applications, or equivalent options, key selection criteria include its 3750 Vrms input-output isolation, gull-wing surface-mount DIP-6 package, dual-mode output configuration (AC/DC vs. DC-only), low 3 mA turn-on threshold, and compliance with UL1577 and CSA Component Acceptance Notice #5.
Technical Context
The ASSR-3211-301E integrates an AlGaAs infrared LED optically coupled to a photovoltaic diode array and driver circuit that controls two discrete high-voltage MOSFETs. Its output stage supports both AC/DC and DC-only load configurations via external pin wiring (Connection A or B), enabling flexible use across signal and low-power power-switching applications.
It operates over –40°C to +85°C, features 1 kV/μs transient immunity, and achieves 3750 Vrms isolation per UL1577 with ≥4.9 mm creepage/clearance. The device uses CMOS-compatible input drive and includes internal turn-off circuitry ensuring reliable contact opening at ≤0.8 V input voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Withstand Voltage | 250 V - maximum continuous voltage across output terminals without breakdown; requires external overvoltage protection for transients |
| Max Output Current (AC/DC) | 0.2 A - rated for general-purpose AC or DC load switching up to 50 W at 250 V |
| Max Output Current (DC-only) | 0.4 A - achievable only in Connection B configuration; enables higher DC load capacity |
| On-Resistance (AC/DC) | 8 Ω typical - determines I²R loss and self-heating during conduction; impacts thermal derating |
| On-Resistance (DC-only) | 2.5 Ω typical - reduces conduction loss by >65% versus AC/DC mode, improving efficiency for pure DC loads |
| Turn-On Time | 0.25 ms typical - enables fast digital control loop response; critical for data comms and test equipment |
| Input Turn-On Threshold | 3 mA - ensures compatibility with standard logic outputs (e.g., 3.3 V/5 V MCU GPIO) without external drivers |
Pinout & Package
ASSR-3211-301E uses a 6-pin DIP gull-wing surface-mount package (300-mil width), RoHS-compliant, with lead-free finish and 0.025" ±0.010" lead pitch. Package outline matches JEDEC MS-018AB, optimized for reflow soldering per IPC/JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode (LED Input) | Positive terminal of infrared LED; connect to current-limited logic source (e.g., MCU GPIO + series resistor) |
| Pin 2 | Cathode (LED Input) | Ground return for LED; defines turn-on when forward-biased ≥3 mA |
| Pin 3 | Output Terminal 1 (Source) | Common source node for internal MOSFET pair; tied to load return in Connection A, or floating in Connection B |
| Pin 4 | Output Terminal 2 (Drain) | Main switched output node; connects to load high-side in AC/DC mode or positive rail in DC-only mode |
| Pin 5 | Output Terminal 3 (Drain) | Second switched output node; used with Pin 4 for bidirectional AC switching or as alternate drain in DC-only mode |
| Pin 6 | Output Terminal 4 (Source) | Secondary source node; completes output path in Connection B for 0.4 A DC operation |
Key Features
| Feature | Design Value |
|---|---|
| Optically isolated SPST relay | Replaces electromechanical relays with zero bounce, infinite cycle life, and no contact arcing - ideal for high-reliability telecom switching |
| Dual-mode output configuration | Supports both AC/DC (0.2 A, 8 Ω) and DC-only (0.4 A, 2.5 Ω) operation via external pin wiring - maximizes design flexibility without component change |
| 3750 Vrms input-output isolation | Meets UL1577 safety requirements for reinforced insulation; enables safe interface between low-voltage control and hazardous AC mains domains |
| 0.25 ms / 0.02 ms switching | Enables real-time signal routing in data communications and automated test equipment where timing precision is critical |
| CMOS-compatible 3 mA turn-on | Directly drivable from microcontroller GPIO pins without buffer stages - reduces BOM count and board space |
Applications
| Telecom Signal Routing | Industrial PLC I/O Isolation |
|---|---|
Use Scenario: Switching analog voice/data signals between line cards in carrier-grade access equipment. IC Role / Device Role / Timing Role: Solid-state relay providing galvanically isolated SPST switching with sub-millisecond timing control. Use Value: Eliminates mechanical relay wear-out and contact chatter, enabling >10⁹ operations lifetime and stable impedance matching across temperature. |
Use Scenario: Isolating 24 V DC sensor inputs and 120 V AC actuator outputs in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Input/output channel isolator with reinforced safety barrier and fast response for deterministic scan-cycle timing. Use Value: Provides 3750 Vrms working insulation and 1 kV/μs transient immunity - meets IEC 61000-4-5 surge immunity requirements for factory floor environments. |
| Medical Diagnostic Equipment | Security System Control Panels |
Use Scenario: Safely routing patient-connected ECG/EEG signals to multiple monitoring channels while maintaining MDD Class IIa creepage requirements. IC Role / Device Role / Timing Role: Biomedical-grade isolation switch ensuring patient safety via certified 3750 Vrms barrier and <100 nA leakage current. Use Value: Meets IEC 60601-1 2×MOPP requirements with 7.4 mm creepage and CTI ≥175 - eliminates need for additional isolation transformers or optocoupler cascades. |
Use Scenario: Controlling siren, door lock, and alarm strobe circuits from low-voltage microcontroller in intrusion detection panels. IC Role / Device Role / Timing Role: High-reliability load switch enabling silent, spark-free activation of 24 V DC solenoids and 120 V AC sirens. Use Value: Delivers 0.4 A DC capability in Connection B mode - sufficient to drive high-current locks without external MOSFETs, reducing system cost and footprint. |
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 TLP3545A | SO-6 package; 400 V output rating; 0.15 A max current; 16 Ω R(ON); 0.5 ms TON | Higher voltage rating but lower current and slower switching - suited for high-voltage, low-current sensing rather than power switching | Select when >300 V withstand is required and load current remains ≤150 mA |
| Vishay VO3120 | DIP-6 package; 400 V output rating; 0.3 A max current; 12 Ω R(ON); 0.35 ms TON; no DC-only mode | Higher voltage/current rating but fixed AC/DC architecture - lacks ASSR-3211-301E's configurable DC-only 0.4 A mode | Select when broader voltage margin is prioritized over DC efficiency optimization and dual-mode flexibility |
Compared with TLP3545A and VO3120, the ASSR-3211-301E uniquely offers field-selectable DC-only operation delivering 0.4 A at 2.5 Ω, faster 0.25 ms turn-on, and tighter 8 Ω AC/DC R(ON) - making it optimal for space-constrained, high-cycle industrial and telecom systems requiring both versatility and performance.
Availability
ASSR-3211-301E is available at Aetrix Electronics and suitable for telecom signal routing, industrial PLC I/O isolation, and medical diagnostic equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant gull-wing surface-mount packaging.
Supply support for ASSR-3211-301E 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 is a global semiconductor leader specializing in infrastructure software, networking, broadband, wireless, storage, and industrial connectivity solutions.
The ASSR-32xx series was designed specifically for high-reliability, long-lifetime replacement of electromechanical relays in signal and low-power AC/DC switching applications across telecom, industrial, medical, and security markets.
FAQ
What is the difference between Connection A and Connection B for ASSR-3211-301E?
Connection A configures ASSR-3211-301E for AC/DC operation with 0.2 A current rating and 8 Ω typical on-resistance. Connection B reconfigures pins to enable DC-only operation, raising current capacity to 0.4 A and reducing on-resistance to 2.5 Ω. The ASSR-3211-301E datasheet Figure 3 shows exact pin wiring for both modes - no external components are needed beyond proper PCB layout.
Does ASSR-3211-301E require an external flyback diode?
No, ASSR-3211-301E does not require an external flyback diode because its output stage uses MOSFETs with intrinsic body diodes and integrated turn-off circuitry. Unlike inductive-load-driven electromechanical relays, the ASSR-3211-301E handles energy dissipation internally - confirmed in the "Turn-off Circuit" block of the functional diagram on page 2 of the AV02-0260EN datasheet.
What safety certifications apply to ASSR-3211-301E?
ASSR-3211-301E is UL Recognized per UL1577 (3750 Vrms for 1 minute) and approved under CSA Component Acceptance Notice #5. It also meets IEC/EN/DIN EN 60747-5-2 insulation requirements, with 4.9 mm minimum creepage/clearance and CTI ≥175 - all verified in the Regulatory Information section (page 8) of the AV02-0260EN datasheet.
Can ASSR-3211-301E switch 120 V AC loads reliably?
Yes, ASSR-3211-301E is rated for 250 V output withstand voltage and specified for AC/DC operation up to 0.2 A - sufficient for switching 120 V AC loads drawing ≤24 W. Its 1 kV/μs transient immunity and internal turn-off circuit ensure robust zero-crossing–free switching without arcing or contact welding, unlike electromechanical relays.
What is the maximum ambient temperature for continuous operation of ASSR-3211-301E?
The ASSR-3211-301E is rated for continuous operation from –40°C to +85°C ambient temperature, as stated in the Recommended Operating Conditions table (page 9) of the AV02-0260EN datasheet. Derating curves in Figure 1 show allowable output current decreases linearly above 40°C - at 85°C, max current drops to ~0.12 A for AC/DC mode.
ASSR-3211-301E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Broadcom Limited
- Series:
- ASSR
- Packaging:
- Tube
- Product Status:
- Obsolete
- Mounting Type:
- Surface Mount
- Circuit:
- SPST-NO (1 Form A)
- Output Type:
- AC, DC
- Voltage - Input:
- 1.3VDC
- Voltage - Load:
- 0 V ~ 250 V
- Load Current:
- 200 mA
- On-State Resistance (Max):
- 10 Ohms
- Termination Style:
- Gull Wing
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 6-DIP Gull Wing
- Approval Agency:
- CSA, UL
- Grade:
- -
- Qualification:
- -
ASSR-3211-301E FAQ
1.How can I place an order for ASSR-3211-301E through Aetrix?
Please submit a Request for Quotation (RFQ) for ASSR-3211-301E 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-3211-301E reliable?
The price and inventory of ASSR-3211-301E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ASSR-3211-301E is usually 5 days.
3.What payment methods are accepted for ASSR-3211-301E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ASSR-3211-301E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ASSR-3211-301E?
ASSR-3211-301E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ASSR-3211-301E 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-3211-301E?
For technical support, including ASSR-3211-301E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ASSR-3211-301E requirements.
6.How does Aetrix verify that ASSR-3211-301E is sourced from the original manufacturer or authorized distributors?
All ASSR-3211-301E 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-3211-301E meets industry standards.
7.What is the process for return or replacement of ASSR-3211-301E?
All ASSR-3211-301E units undergo pre-shipment inspection (PSI). If there is an issue with ASSR-3211-301E, 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-3211-301E part is unused and in its original packaging.
Return procedure for ASSR-3211-301E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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