PVT322PBF - 250V 170mA Dual Photovoltaic Relay DIP-8 | Infineon
MPN: PVT322PBF β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.87 | $9.87 |
| 10 | $8.9 | $89.00 |
| 100 | $7.45 | $745.00 |
| 500 | $6.97 | $3,485.00 |
| 1,000 | $6.2 | $6,200.00 |
PVT322PBF Overview
A photovoltaic relay (PVR) is a solid-state relay variant that uses optically-coupled photovoltaic cells instead of secondary-side bias supplies to generate the gate drive voltage for the MOSFET output. This topology sits within the broader optocoupler / solid-state relay taxonomy, which itself branches from electromechanical relays, semiconductor relays, and isolated switch ICs. PVRs eliminate the need for an external DC bias on the output side, making them well-suited for high-side or floating-switch applications where maintaining isolation between the low-voltage control domain and a high-voltage load is mandatory.
Key features include 250V continuous load voltage (250V AC peak or DC), 170mA on-state load current per channel, 5kV input-to-output isolation, bounce-free MOSFET switching, and zero-offset turn-on behavior. The HEXFET output stage provides low on-resistance of 8 ohms typical per channel, reducing steady-state conduction losses versus small-signal MOSFET SSR alternatives. The dual 1-Form-A contact configuration allows independent control of two separate loads, or series/parallel wiring for higher voltage or current.
The architecture uses a GaAlAs infrared LED optically coupled to a monolithic photovoltaic cell array that produces approximately 6V open-circuit voltage under proper LED bias. This generated voltage directly drives the gate of the HEXFET output MOSFET, eliminating auxiliary bias supplies while maintaining >5000Vrms isolation between input and output per IEC 60747-5-2 phototransistor isolator guidelines referenced in the datasheet.
Typical applications include instrumentation multiplexing, automatic test equipment (ATE) reed-relay replacement, telecom line switching, industrial process control, programmable logic controller (PLC) outputs, and medical equipment isolation switching. The bounce-free operation is especially valuable in data-acquisition front-ends and audio signal routing where electromechanical relay contact bounce introduces measurement error.
When designing with this part, observe the minimum LED forward current (typically 5mA for guaranteed turn-on) and derate load current with ambient temperature above 40C. Two independent channels share the same DIP-8 footprint, enabling drop-in upgrade from single-channel PVG-series solid-state relays while doubling switch density on the same PCB area.
This page synthesizes distributor inventory, drop-in alternatives, and practical design notes not found in the standalone manufacturer datasheet, providing engineers with consolidated decision data for relay selection.
Drop-in alternatives for PVT322PBF β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with PVT322PBF (same form factor and footprint) β differing in Contact Configuration, Mounting Type, Package, Relay Type.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
PVT322
β Drop-Inπ Reference alternative (not in catalog)
PVT322AS
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
PVT322S
β Drop-Inπ Reference alternative (not in catalog)
PVG612ASPBF
β Drop-Inβ In Stock
$2.65 / Unit
View Datasheet βLH1540AAB
β Drop-Inπ Reference alternative (not in catalog)
PVT322PBF Maximum Ratings & Electrical Characteristics
| Relay Type | Solid State Photovoltaic Relay (PVR) |
| Contact Configuration | 2 x SPST-NO (2 Form A), dual-pole |
| Load Voltage Rating (Max) | 250 V AC peak or DC |
| Load Current Rating (Max) | 170 mA AC/DC per channel |
| On-State Resistance (Typical) | 8 ohm per channel |
| Input-to-Output Isolation | 5000 Vrms |
| LED Forward Current (Typical) | 5 mA |
| Output Switch Technology | HEXFET power MOSFET |
| Photovoltaic Generator Light Source | GaAlAs infrared LED |
| Operating Temperature Range | -40 C to +85 C |
| Package | 8-DIP (0.300 inch, 7.62mm) through-hole |
| Mounting Type | Through-hole (thru-hole); surface-mount (gull-wing) variant PVT322S available |
| RoHS Compliance | Compliant (PbF suffix indicates lead-free) |
| Contact Bounce | None (bounce-free MOSFET switching) |
PVT322PBF Pin Configuration
| Pin 1 | LED1+ β Channel 1 LED anode (input) |
| Pin 2 | LED1- β Channel 1 LED cathode (input) |
| Pin 3 | OUT1A β Channel 1 MOSFET source/output A |
| Pin 4 | OUT1B β Channel 1 MOSFET drain/output B |
| Pin 5 | OUT2B β Channel 2 MOSFET drain/output B |
| Pin 6 | OUT2A β Channel 2 MOSFET source/output A |
| Pin 7 | LED2- β Channel 2 LED cathode (input) |
| Pin 8 | LED2+ β Channel 2 LED anode (input) |
Typical Applications
PVT322PBF is suitable for 7 applications: Instrumentation Multiplexing, Automatic Test Equipment (ATE) Switching, Telecommunications Line Switching, PLC Discrete Outputs, Medical Equipment Isolation Switching, Audio Signal Routing, Security and Access Control Switching.
Instrumentation Multiplexing
The PVT322PBF fits instrumentation multiplexing applications because its bounce-free HEXFET switching eliminates contact-induced transients that would otherwise corrupt precision analog measurements. With 5000Vrms input-to-output isolation, it allows a low-voltage microcontroller or FPGA to safely switch 250V signals routed to a digitizer or DMM. The 8-ohm on-resistance per channel adds negligible error compared to the source impedance of typical transducer signals, while the dual-channel 8-DIP package lets one IC replace two single-channel reed relays, doubling channel density. Designers should place 100 ohm series resistors on each input LED to limit inrush and observe the 5mA minimum LED forward current for guaranteed turn-on.
Recommended
Automatic Test Equipment (ATE) Switching
In ATE switching matrices, the PVT322PBF replaces electromechanical reed relays with a solid-state alternative offering unlimited mechanical switching cycles and superior vibration tolerance. Its 170mA load current supports most analog signal-path switching up to 250V, including test points for power-supply rails and analog front-ends. The bounce-free behavior preserves signal integrity for high-speed ADC sampling, eliminating the need for software de-bounce delays that slow test throughput. Two independent Form-A channels can be paralleled for 340mA or series-stacked for higher voltage in high-density test-head fixtures. The through-hole DIP-8 package simplifies prototype fixture builds and field-replaceable modules.
Recommended
Telecommunications Line Switching
Telecommunications line switching applications benefit from the PVT322PBF's 250V continuous rating, which covers legacy -48V central-office battery feeds plus ringing voltages up to 150V AC. The 5000Vrms isolation barrier protects line-interface cards from surge events meeting GR-1089 intra-building requirements. The 8-ohm on-resistance introduces minimal insertion loss for voice-band signals while providing adequate power handling for off-hook and ring-trip circuits. Dual channels enable space-efficient implementation of ring-side and tip-side switching in line cards, while the solid-state construction supports the >20-year operational life required for central-office deployments.
Recommended
PLC Discrete Outputs
Programmable Logic Controller (PLC) discrete output modules use the PVT322PBF as a 250V-rated sink-switch driver for industrial loads such as solenoids, indicator lamps, and small motor starters. The 170mA per-channel rating is well-matched to 24V DC pilot duty and 120V AC indicator circuits commonly found in control panels. The dual-channel 8-DIP package doubles output density in point-count-limited PLC modules versus single-channel PVR alternatives. Bounce-free operation prevents inductive load ringing that could falsely trigger PLC inputs, while the wide -40C to +85C operating range supports unconditioned industrial cabinet environments.
Recommended
Medical Equipment Isolation Switching
Medical isolation switching applications leverage the PVT322PBF's 5000Vrms input-to-output isolation to meet IEC 60601-1 patient-protection creepage and clearance requirements for BF-type applied parts. The 250V/170mA rating handles low-power therapeutic device outputs and patient-monitor channel switching. Bounce-free solid-state switching is critical for patient-safety isolation where electromechanical contact welding could create a fault path. The dual-channel package simplifies multi-lead ECG, EEG, or pulse-oximeter front-end switching, while the through-hole DIP package facilitates cleaning and inspection in medical device manufacturing.
Recommended
Audio Signal Routing
Audio signal routing applications use the PVT322PBF for clickless, pop-free source switching in mixers and high-end home audio equipment. The bounce-free MOSFET switching eliminates the click and pop artifacts produced by electromechanical relay contacts during transition, preserving listener experience during input source changes. The 8-ohm on-resistance is acceptable for line-level audio signals but unsuitable for speaker-level switching; designers should place the relay ahead of the pre-amplifier stage. Dual channels support stereo source-switching with a single IC, while the 5000Vrms isolation prevents ground loops between source components.
Recommended
Security and Access Control Switching
Security and access control panels use the PVT322PBF for silent, vibration-immune switching of alarm loops, door strikes, and sensor isolators. Its solid-state operation prevents audible relay chatter that could be exploited for unauthorized access, while its 250V/170mA rating covers most low-voltage security-system buses and magnetic-lock power feeds. The dual-channel 8-DIP configuration allows one IC to handle both main and auxiliary alarm loops in compact panel designs. The wide operating temperature range suits outdoor enclosures in unheated or uncooled installations, and the lead-free PbF plating meets RoHS requirements for commercial security product lines.
Recommended
Recommended Products Summary
Engineering reference data for PVT322PBF β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PVT322 | PVT322S | PVG612ASPBF | LH1540AAB |
|---|---|---|---|---|---|
| Brand | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies | Vishay Intertechnology |
| Package | 8-DIP (0.300 inch) | 8-DIP (0.300 inch) - same | 8-SMD (gull-wing) - variant | 6-DIP - different | 6-DIP - different |
| Contact Configuration | 2 Form A (dual SPST-NO) | 2 Form A - same | 2 Form A - same | 1 Form A - different | 1 Form A - different |
| Load Voltage (Max) | 250 V AC/DC | 250 V | 250 V | 60 V | 350 V |
| Load Current (Max) | 170 mA | 170 mA | 170 mA | 2 A | 120 mA |
| On-Resistance (Typical) | 8 ohm | 8 ohm | 8 ohm | 0.1 ohm | 20 ohm |
| Input-Output Isolation | 5000 Vrms | 5000 Vrms | 5000 Vrms | 4000 Vrms | 5300 Vrms |
| Lead-Free (PbF) | Yes | No (SnPb) | Yes | Yes | Yes |
| RoHS Compliance | Compliant | Non-compliant | Compliant | Compliant | Compliant |
Key Differentiators
- Dual independent channels in single 8-DIP package (vs PVG612ASPBF)
- Higher load voltage capability at similar current rating (vs LH1540AAB)
- Lead-free PbF RoHS-compliant terminal plating (vs PVT322)
Design Notes
The PVT322PBF LED input requires a minimum forward current of approximately 5 mA for guaranteed output turn-on across the full operating temperature range. Drive the LED with a current-limiting resistor calculated as R = (VCC - VLED) / IF, where VLED is typically 1.2V at 5 mA. For 5V logic drive, use a 680-ohm resistor; for 3.3V logic, use 470 ohm. Place the resistor close to the IC to minimize noise injection into the optically-coupled control loop. Add a reverse-bias protection diode across the LED if the control signal may be applied with reverse polarity.
At 170 mA load current with 250V load, the PVT322PBF dissipates approximately 14 mW per channel from the 8-ohm on-resistance, which is well within thermal limits. However, if two channels carry peak loads simultaneously, total dissipation remains negligible (under 30 mW). The DIP-8 package has a thermal resistance of approximately 100 C/W junction-to-ambient, so no heatsinking is required for normal operation. Derate load current linearly above 40C ambient to maintain MOSFET junction temperature within the 150C absolute maximum rating.
Maintain 8 mm minimum creepage distance between the input LED pins (1, 2, 7, 8) and the output MOSFET pins (3, 4, 5, 6) to preserve the 5000Vrms isolation rating on the PCB. Avoid running any high-voltage traces or copper pours under the relay package; route input-side ground and output-side load grounds as separate nets to prevent surface arcing. Use a slot or cutout in the PCB under the package if the design must meet reinforced insulation per IEC 60747-5-2. Through-hole DIP mounting simplifies conformal coating and PCB cleaning in medical or industrial applications.
Do not exceed the 250V maximum load voltage, including any transient overshoot from inductive loads. For DC loads exceeding 50 mA, place a flyback diode or snubber across inductive loads to protect the HEXFET output. Do not connect the two Form A channels in series for voltages exceeding 250V total; the HEXFET output blocking voltage is not increased by series connection due to leakage current imbalance. Avoid driving the LED from a high-impedance source; use a totem-pole or push-pull driver with at least 10 mA sourcing capability to ensure crisp turn-on.
Compliance Information
RoHS compliant per PbF suffix. Lead-free terminal plating. Not AEC-Q100 qualified (not an automotive-grade part). Halogen-free status not explicitly stated in verified data.
