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onsemi HSR412LSR2
- Part No.:
- HSR412LSR2
- Manufacturer:
- onsemi
- Category:
- Solid State Relays (SSR)
- Package:
- 6-SMD (0.300", 7.62mm)
- Datasheet:
-
HSR412LSR2.pdf
- Description:
- SSR RELAY SPST-NO 120MA 0-400V
- Quantity:
- Payment:
- Shipping:
Inventory:1,867
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Product details
Overview
HSR412LSR2 from Fairchild Semiconductor is a photovoltaic solid-state relay optocoupler with 400 VDC/AC(peak) load voltage rating, 4000 VRMS input-output isolation, and active current limit circuitry for surge transient tolerance. It integrates an AlGaAs infrared LED optically coupled to a power MOSFET driven by a photovoltaic generator, housed in a 6-pin DIP package. It is used in telecom ring injection relays and ground-start circuits requiring bounce-free, solid-state switching.
For engineers reviewing the HSR412LSR2 datasheet, pinout, applications, or equivalent options, key selection criteria include its 400 V operating voltage range, 120 mA max series load current at +40°C, 35 Ω max on-state resistance (series), 2.0 ms turn-on time, and UL/CSA certification - all critical for telecom interface and industrial control relay replacement designs.
Technical Context
The HSR412LSR2 uses a monolithic photovoltaic generator to drive a power MOSFET output stage without external bias, enabling true zero-bias operation. Its active current limit circuitry provides defined overcurrent protection during transients, distinguishing it from non-L variants like HSR412.
It supports both series and parallel load configurations, with distinct electrical limits per topology: series connection yields higher voltage capability (400 V) but lower load current (120 mA), while parallel configuration increases current capacity (200 mA) at reduced voltage margin. Isolation performance is maintained across -40°C to +85°C operating temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Load Voltage Range | 400 VDC or VAC(peak): enables direct replacement of electromechanical relays in 24–48 V telecom and 120/240 VAC industrial control interfaces. |
| Isolation Voltage | 4000 VRMS: meets reinforced insulation requirements for safety-critical signal isolation in medical and industrial equipment. |
| On-State Resistance | 35 Ω max (series, 25°C): determines I²R heating at rated load; requires thermal derating above +40°C ambient. |
| Turn-On Time | 2.0 ms max: ensures deterministic timing in dial-out and ring-injection sequences where sub-10 ms response is required. |
| Control Current | 3.0 mA min / 25 mA max: compatible with standard logic-level drivers (e.g., MCU GPIO, opto-isolator outputs) without external amplification. |
| Off-State Leakage | 1.0 µA max at ±400 V: guarantees high-impedance blocking in high-voltage standby states, critical for low-power monitoring circuits. |
| ESD Rating | 4000 V HBM: protects against handling damage during PCB assembly and field service in unshielded environments. |
Pinout & Package
HSR412LSR2 is housed in a 6-pin dual-in-line through-hole package (DIP-6), with surface-mount variant SR2 indicating tape-and-reel packaging for automated assembly. Pin 1 is marked with a dot or notch; body dimensions are 8.43–9.90 mm × 6.10–6.60 mm × 3.28–3.53 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Anode) | LED Anode Input | Positive terminal for infrared LED; requires current-limiting resistor when driven from 3.3 V or 5 V logic sources. |
| 2 (Cathode) | LED Cathode Input | Return path for LED forward current; connects to ground or driver low-side switch. |
| 3 (N/C) | No Connect | Internally unconnected; must remain floating - no routing or grounding permitted. |
| 4 (Drain) | MOSFET Drain Output | High-side switching node; connects to load's positive rail in high-side configuration. |
| 5 (Source) | MOSFET Source Output | Low-side return path; ties to load ground or system common in standard configurations. |
| 6 (Drain) | MOSFET Drain Output | Duplicate drain terminal for parallel layout routing or enhanced current sharing; electrically identical to Pin 4. |
Key Features
| Feature | Design Value |
|---|---|
| Active Current Limit Circuitry | Enables 130–220 mA sustained series load current with defined trip threshold, eliminating need for external fusing in surge-prone telecom lines. |
| Bounce-Free Solid-State Switching | Eliminates mechanical contact chatter and arcing, ensuring clean transitions in pulse-dialing and ring-signal generation circuits. |
| UL and CSA Approval | Validated for end-equipment safety compliance in North American telecom and industrial control systems without additional isolation barriers. |
| Photovoltaic Gate Drive | Self-powered MOSFET gate activation removes requirement for auxiliary supply rails, simplifying isolated power domain design. |
| Low Input/Output Capacitance | 1.0 pF max CIO minimizes high-frequency coupling between control and load sides, preserving signal integrity in mixed-signal systems. |
Applications
| Ring Injection Relay | Dial-Out Relay |
|---|---|
|
Use Scenario: Injecting AC ring voltage (75–105 VAC, 20 Hz) onto telephone line during call setup. IC Role / Device Role / Timing Role: High-voltage, low-duty-cycle solid-state switch isolating ring generator from line interface ICs. Use Value: HSR412LSR2 withstands 400 V peak ring voltage and delivers <2 ms turn-on to synchronize with precise ring cadence timing. |
Use Scenario: Closing loop for off-hook detection and dial pulse generation in analog PBX extensions. IC Role / Device Role / Timing Role: Bidirectional DC path controller replacing reed relays in legacy telephony hardware. Use Value: Bounce-free operation ensures accurate pulse counting; 120 mA series current supports up to 1000 Ω loop resistance. |
| Ground Start Interface | Industrial Control Signal Isolation |
|
Use Scenario: Detecting and asserting ground-start signaling in trunk circuits to prevent glare and ensure call setup priority. IC Role / Device Role / Timing Role: Isolated sense-and-switch element monitoring tip/ring ground continuity before line seizure. Use Value: 4000 VRMS isolation prevents ground-loop noise injection; 1.0 µA leakage ensures reliable open-circuit detection. |
Use Scenario: Controlling 24–48 VDC solenoids or indicator lamps in PLC I/O modules with microcontroller-level logic. IC Role / Device Role / Timing Role: Optically isolated high-side switch decoupling field-side loads from logic-side controllers. Use Value: Active current limiting protects against shorted solenoid windings; 35 Ω RON enables <1 V drop at 25 mA drive. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar photovoltaic relay applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Vishay VO3120 | 400 V load rating, 1.5 kV isolation, no active current limit, TO-220 package | Lacks integrated surge protection; requires external current limiting for telecom transients | Preferred where board space permits larger package and external protection is acceptable |
| IXYS CPC1976Y | 400 V load rating, 5000 VRMS isolation, 150 mA series current, SOIC-6 package | Higher isolation and current rating, but lacks UL/CSA certification and active current limit | Suitable for non-certified industrial systems needing compact surface-mount footprint |
Compared with HSR412LSR2, VO3120 offers higher package robustness but no built-in current limiting, while CPC1976Y provides superior isolation and smaller footprint yet omits safety certifications and active surge protection - making HSR412LSR2 uniquely suited for certified telecom infrastructure where reliability under transient stress is mandatory.
Availability
HSR412LSR2 is available at Aetrix Electronics and suitable for telecom interface modules, industrial PLC I/O cards, and analog telephony equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for HSR412LSR2 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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and optoelectronic components before its acquisition by ON Semiconductor in 2016.
The HSR412LSR2 belongs to Fairchild's photovoltaic relay family designed specifically for telecom switching applications demanding certified isolation, surge resilience, and zero-bias operation - not general-purpose optocouplers.
FAQ
What is the maximum load voltage rating for HSR412LSR2?
The HSR412LSR2 has a maximum operating voltage range of 400 VDC or VAC(peak), verified per its Absolute Maximum Ratings table. This rating applies to both series and parallel load configurations and is validated under specified test conditions including TA = –40°C to +85°C. The device is rated for continuous operation up to this voltage when used within its thermal and current limits.
Does HSR412LSR2 require an external power supply for the output MOSFET?
No, the HSR412LSR2 does not require an external power supply for the output MOSFET. It uses a photovoltaic generator to produce gate drive voltage directly from the input LED current, enabling fully self-powered switching. This eliminates the need for auxiliary bias rails and simplifies isolated system design - a core feature confirmed in the device description and schematic.
How does the active current limit function in HSR412LSR2 differ from HSR412?
The HSR412LSR2 incorporates active current limit circuitry that defines minimum and maximum load current thresholds (e.g., 130–220 mA series), whereas the standard HSR412 lacks this feature. This allows HSR412LSR2 to withstand surge transients without latch-up or degradation, as documented in its Electrical Characteristics table under ILMT parameter - a distinction explicitly stated in the product description.
Can HSR412LSR2 be used in parallel load configurations?
Yes, HSR412LSR2 supports parallel load connections, delivering up to 200 mA load current at +40°C with a maximum on-resistance of 9 Ω. The datasheet specifies separate electrical limits for series and parallel topologies, including distinct RON, IL, and ILMT values - confirming explicit design validation for parallel use in applications requiring higher current capacity.
What safety certifications does HSR412LSR2 hold?
HSR412LSR2 is UL and CSA approved, as stated in the Features section and confirmed in the Absolute Maximum Ratings table. These certifications validate its isolation barrier performance and construction for use in end-equipment requiring recognized safety compliance - particularly relevant for telecom and industrial control applications subject to regulatory review.
HSR412LSR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- HSR412L
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Mounting Type:
- Surface Mount
- Circuit:
- SPST-NO (1 Form A)
- Output Type:
- AC, DC
- Voltage - Input:
- 1.6VDC
- Voltage - Load:
- 0 V ~ 400 V
- Load Current:
- 120 mA
- On-State Resistance (Max):
- 35 Ohms
- Termination Style:
- Gull Wing
- Operating Temperature:
- -40°C ~ 80°C
- Supplier Device Package:
- 6-SMD
- Approval Agency:
- CSA, UL
- Grade:
- -
- Qualification:
- -
HSR412LSR2 FAQ
1.How can I place an order for HSR412LSR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for HSR412LSR2 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 HSR412LSR2 reliable?
The price and inventory of HSR412LSR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HSR412LSR2 is usually 5 days.
3.What payment methods are accepted for HSR412LSR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HSR412LSR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HSR412LSR2?
HSR412LSR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HSR412LSR2 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 HSR412LSR2?
For technical support, including HSR412LSR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HSR412LSR2 requirements.
6.How does Aetrix verify that HSR412LSR2 is sourced from the original manufacturer or authorized distributors?
All HSR412LSR2 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 HSR412LSR2 meets industry standards.
7.What is the process for return or replacement of HSR412LSR2?
All HSR412LSR2 units undergo pre-shipment inspection (PSI). If there is an issue with HSR412LSR2, 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 HSR412LSR2 part is unused and in its original packaging.
Return procedure for HSR412LSR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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