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onsemi HSR412
- Part No.:
- HSR412
- Manufacturer:
- onsemi
- Category:
- Solid State Relays (SSR)
- Package:
- 6-DIP (0.300", 7.62mm)
- Datasheet:
-
HSR412.pdf
- Description:
- SSR RELAY SPST-NO 140MA 0-400V
- Quantity:
- Payment:
- Shipping:
Inventory:1,104
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Product details
Overview
HSR412 from Fairchild Semiconductor is a photovoltaic solid-state relay optocoupler featuring 400 VDC/AC(peak) load voltage rating, 4000 VRMS input-output isolation, and dual 6-pin DIP package with internal AlGaAs LED coupled to power MOSFET detector. It delivers bounce-free switching for telecom on/off-hook and ring injection applications requiring high reliability and ESD immunity.
For engineers reviewing the HSR412 datasheet, pinout, applications, or equivalent options, key selection criteria include its 400 V operating voltage range, 2.0–25 mA control current requirement, 140 mA max series load current at +40°C, 27 Ω max on-resistance, and UL/CSA safety certification - all critical for telecom relay replacement designs.
Technical Context
The HSR412 uses an AlGaAs infrared LED optically coupled to a photovoltaic generator that drives a power MOSFET output stage, eliminating external bias and enabling true zero-bias operation. Its architecture provides galvanic isolation without auxiliary supply rails and supports both series and parallel load configurations.
Unlike mechanical relays, the HSR412 achieves sub-2 ms turn-on (2.0 ms max) and 0.5 ms turn-off times with no contact wear or arcing. It operates across –40°C to +85°C ambient and withstands 4000 V ESD (HBM), making it suitable for harsh telecom line-card environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Load Voltage Range | 400 VDC or VAC(peak): supports full-range telephone line signaling including ring voltage injection up to ±400 V. |
| Isolation Voltage | 4000 VRMS: meets UL/CSA reinforced insulation requirements for telecom interface safety compliance. |
| Control Current | 3.0–25 mA: enables direct drive from low-power microcontrollers or logic outputs without external amplification. |
| On-State Resistance | 27 Ω (max, series): limits voltage drop to ≤3.8 V at 140 mA load, preserving signal integrity in analog switching paths. |
| Turn-On Time | 2.0 ms (max): ensures deterministic timing for dial pulse generation and hook-switch emulation. |
| Off-State Leakage | 1.0 µA (max at ±400 V): guarantees high impedance blocking in standby, preventing false triggering in multi-channel systems. |
| ESD Rating | 4000 V HBM: protects against handling and board-level ESD events during assembly and field service. |
Pinout & Package
HSR412 is housed in a standard 6-pin dual-in-line through-hole package (DIP-6), with 2.54 mm pin pitch and JEDEC MS-001 compliant outline. Package dimensions: 8.43–9.90 mm length × 6.10–6.60 mm width × 3.28–3.53 mm height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Anode) | LED Anode Input | Positive terminal of internal AlGaAs infrared LED; requires current-limiting resistor when driven from 3.3 V or 5 V logic. |
| 2 (Cathode) | LED Cathode Input | Return path for LED forward current; connects to ground or logic low to activate relay. |
| 3 (Drain) | MOSFET Drain Output | High-side switch terminal; connects to load positive or AC line phase in series configuration. |
| 4 (NC) | No Connect | Internally unconnected; must remain floating - not tied to ground or voltage rail. |
| 5 (Drain) | MOSFET Drain Output | Second drain terminal enabling parallel connection for higher load current (210 mA max). |
| 6 (Source) | MOSFET Source Output | Common return for MOSFET channel; connects to load negative or AC line neutral in series configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Photovoltaic Gate Drive | Self-powered MOSFET activation eliminates need for external gate supply, simplifying isolated control design. |
| Bounce-Free Switching | Zero mechanical contact wear ensures >10⁹ operations - critical for high-cycle telecom hook-switch applications. |
| Active Surge Tolerance | Withstands transient overloads without latch-up or degradation, unlike passive opto-MOS devices. |
| Low Input/Output Capacitance | 1.0 pF max CIO enables fast edge response and minimal signal coupling across isolation barrier. |
| Thermal Stability | On-resistance drift <2× over –40°C to +85°C, maintaining consistent voltage drop across temperature. |
Applications
| On/Off Hook Switch | Dial Out Relay |
|---|---|
|
Use Scenario: Detecting and controlling telephone line off-hook status in VoIP gateways and PBX line cards. IC Role / Device Role / Timing Role: Solid-state replacement for electromechanical hook-switch relays, providing galvanically isolated line sensing and battery feed control. Use Value: Eliminates contact oxidation and bounce-induced call drops; supports >10⁹ cycles versus ~10⁵ for mechanical relays. |
Use Scenario: Generating rotary dial pulses by rapidly opening/closing the telephone line loop. IC Role / Device Role / Timing Role: Precision timing-controlled switch element synchronized to microcontroller-generated pulse trains. Use Value: Sub-2 ms turn-on/0.5 ms turn-off enables accurate 10-pulse-per-second dialing with ±1% timing tolerance. |
| Ring Injection Relay | Ground Start Interface |
|
Use Scenario: Injecting 20 Hz, 90 VAC ring signal onto telephone lines during incoming call setup. IC Role / Device Role / Timing Role: High-voltage AC switch isolating ring generator circuitry from subscriber line interface. Use Value: 400 V peak rating handles full ring waveform without breakdown; 4000 VRMS isolation prevents noise coupling into sensitive analog circuits. |
Use Scenario: Detecting and asserting ground-start signaling in trunk interfaces for central office line seizure. IC Role / Device Role / Timing Role: Bidirectional isolation switch enabling ground detection while protecting control logic from line transients. Use Value: 1.0 µA off-state leakage ensures reliable ground-loop detection; 4000 V ESD rating survives lightning-induced surges on tip/ring pairs. |
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 | 250 V load rating, 1.5 pF CIO, 100 mA series load current, no active current limiting. | Limited to lower-voltage POTS line applications; unsuitable for 400 V ring injection. | Select HSR412 when 400 V capability, higher surge tolerance, or UL/CSA certification is required. |
| IXYS CPC1976Y | 400 V rating, 120 mA series load current, 35 Ω RON, surface-mount SO-6 package. | Requires PCB rework for SMT placement; lacks through-hole compatibility and identical pinout. | Choose HSR412 for legacy DIP-6 footprint reuse, higher load current margin, and proven telecom qualification. |
Compared with VO3120 and CPC1976Y, the HSR412 offers superior series load current (140 mA vs. 100/120 mA), lower on-resistance (27 Ω vs. 35–50 Ω), and through-hole compatibility - directly supporting cost-effective upgrades of existing telecom relay designs without layout change.
Availability
HSR412 is available at Aetrix Electronics and suitable for telecom infrastructure, VoIP gateway development, and industrial line-card manufacturing requiring stable component supply, long-lifecycle support, and certified isolation performance.
Supply support for HSR412 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. Its optocoupler portfolio emphasized high-reliability isolation for telecom and industrial markets.
The HSR412 belongs to Fairchild's photovoltaic solid-state relay family, designed specifically for replacing electromechanical relays in telephone line interface circuits where bounce-free operation, high voltage isolation, and long-term reliability are mandatory.
FAQ
What is the maximum load current rating for HSR412 in series configuration?
The HSR412 supports up to 140 mA maximum load current in series configuration at +40°C ambient temperature with 5 mA control current. This rating decreases linearly with rising temperature, reaching approximately 100 mA at +85°C. The value is measured under pulsed conditions per Figure 7 in the datasheet and reflects real-world thermal derating behavior essential for telecom line-card thermal design.
Does HSR412 require an external gate supply voltage?
No, the HSR412 does not require an external gate supply. It uses an integrated photovoltaic generator to produce gate drive voltage for the internal power MOSFET, enabling fully self-contained operation from only the LED control current. This eliminates auxiliary bias rails and simplifies isolated switching designs - a core architectural feature confirmed in the device description and schematic on page 2 of the HSR412 datasheet.
Can HSR412 be used in AC switching applications like ring injection?
Yes, the HSR412 is rated for 400 VAC(peak) load voltage and is explicitly qualified for ring injection relay applications per its official Applications list. Its bidirectional MOSFET output and symmetric off-state leakage (<1.0 µA at ±400 V) allow safe, low-distortion AC switching - verified in Figures 4 and 5 showing load current vs. voltage drop across both polarities.
What is the meaning of "L" suffix in HSR412L, and how does it differ from HSR412?
The "L" suffix in HSR412L denotes inclusion of active current limit circuitry, which enhances surge transient tolerance. Compared to HSR412, the HSR412L provides higher current limit thresholds (130–220 mA series vs. unspecified for HSR412) but trades off higher on-resistance (35 Ω vs. 27 Ω) and lower max load current (120 mA vs. 140 mA). HSR412 remains preferred where lower RON and higher steady-state current are prioritized.
Is HSR412 RoHS compliant and lead-free?
Yes, the HSR412 is RoHS compliant and lead-free. Per Fairchild's ordering information and package drawings (pages 7–8), the device uses matte tin plating on leads and conforms to JEDEC J-STD-020 moisture sensitivity level 3. Lead-free reflow profiles are specified in the datasheet (page 9), confirming full compliance with EU RoHS Directive 2011/65/EU and related exemptions.
HSR412 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- HSR412
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Mounting Type:
- Through Hole
- Circuit:
- SPST-NO (1 Form A)
- Output Type:
- AC, DC
- Voltage - Input:
- 1.6VDC
- Voltage - Load:
- 0 V ~ 400 V
- Load Current:
- 140 mA
- On-State Resistance (Max):
- 27 Ohms
- Termination Style:
- PC Pin
- Operating Temperature:
- -40°C ~ 80°C
- Supplier Device Package:
- 6-DIP
- Approval Agency:
- CSA, UL
- Grade:
- -
- Qualification:
- -
HSR412 FAQ
1.How can I place an order for HSR412 through Aetrix?
Please submit a Request for Quotation (RFQ) for HSR412 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 HSR412 reliable?
The price and inventory of HSR412 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HSR412 is usually 5 days.
3.What payment methods are accepted for HSR412?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HSR412 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HSR412?
HSR412 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HSR412 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 HSR412?
For technical support, including HSR412 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HSR412 requirements.
6.How does Aetrix verify that HSR412 is sourced from the original manufacturer or authorized distributors?
All HSR412 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 HSR412 meets industry standards.
7.What is the process for return or replacement of HSR412?
All HSR412 units undergo pre-shipment inspection (PSI). If there is an issue with HSR412, 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 HSR412 part is unused and in its original packaging.
Return procedure for HSR412:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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