PVT322SPBF - Dual 250V/170mA PhotoVoltaic Relay 8-SMD | Infineon
MPN: PVT322SPBF β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.87 | $9.87 |
| 10 | $9.2 | $92.00 |
| 100 | $8.5 | $850.00 |
| 500 | $7.4 | $3,700.00 |
| 1,000 | $6.97 | $6,970.00 |
PVT322SPBF Overview
A photovoltaic relay is an optically-isolated, MOSFET-output semiconductor relay that replaces electromechanical relays in many applications. Unlike reed or armature relays, it contains no moving parts, so it offers unlimited mechanical life, bounce-free switching, and silent operation. The photovoltaic relay belongs to the broader solid-state relay (SSR) family, which sits within the electromechanical-and-power switching category and bridges low-power logic signals to medium-power AC or DC loads.
Key features of the PVT322SPBF include 250 V blocking voltage per pole, 170 mA continuous load current, typically 4 kV input-to-output isolation, and low on-resistance that minimizes conduction losses. Because the output is a photovoltaic-driven MOSFET stack, on-resistance scales with blocking voltage and is higher than that of a discrete power MOSFET. The device requires no external supply on the switch side - the LED's optical energy directly generates the gate-drive voltage that turns the MOSFETs on.
The PVT322SPBF is built around Infineon's HEXFET-class photovoltaic switch architecture with two independent isolated channels, each containing a series MOSFET stack for high blocking voltage. The input stage uses an infrared LED that, when forward-biased, generates the micro-watts of photovoltaic voltage required to bias the MOSFET gates above their threshold. Turn-on time is typically in the millisecond range and there is no arc, bounce, or acoustic noise at switchover.
Typical applications include instrumentation multiplexing, automatic test equipment (ATE) matrix switching, industrial process control I/O, telecom line switching, programmable logic controller (PLC) output modules, and medical equipment isolation. The dual-pole Form A configuration allows the part to replace two single-pole relays in a single footprint, simplifying PCB layout.
When designing with this part, ensure the input LED is biased with adequate forward current (typically 5-10 mA through a current-limit resistor) to guarantee full turn-on of the MOSFET output. Designers must also derate load current at elevated ambient temperatures and observe the maximum blocking voltage with adequate margin for inductive or transient loads.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, providing engineers with a single reference for sourcing, replacement, and application guidance.
Drop-in alternatives for PVT322SPBF 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 PVT322SPBF (same form factor and footprint) β differing in Contact Configuration, Package, Mounting Type, Operating Temperature, Relay Type.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
PVT322AS
β Drop-Inπ Reference alternative (not in catalog)
PVT322S-TPBF
β Drop-Inπ Reference alternative (not in catalog)
PVT322PBF
β Drop-In β οΈ εζ°εΎ ιͺθ―β In Stock
$6.2 / Unit
View Datasheet βPVT322
β Drop-Inπ Reference alternative (not in catalog)
PVT322SPBF Maximum Ratings & Electrical Characteristics
| Relay Type | Solid State Photo-Coupled Relay (PhotoRelay) |
| Contact Configuration | SPST-NO (1 Form A) x 2 |
| Load Voltage Rating | 0 V to 250 V AC/DC |
| Continuous Load Current | 170 mA per pole |
| Package | 8-SMD (0.300", 7.62 mm) |
| Mounting Type | Surface Mount |
| Input Control | Infrared LED, 5-10 mA forward current typical |
| Output Switch | Photovoltaic-driven MOSFET (HEXFET architecture) |
| Operating Temperature | -40C to +85C (typical SSR range) |
| Lead-Free (PBF suffix) | Yes (Pb-free) |
| RoHS Status | Compliant |
PVT322SPBF Pin Configuration
| Pin 1 | LED1+ β LED1 anode (input control side) |
| Pin 2 | LED1- β LED1 cathode (input control side) |
| Pin 3 | OUT1-A β Photovoltaic MOSFET switch 1, terminal A |
| Pin 4 | OUT1-B β Photovoltaic MOSFET switch 1, terminal B |
| Pin 5 | OUT2-A β Photovoltaic MOSFET switch 2, terminal A |
| Pin 6 | OUT2-B β Photovoltaic MOSFET switch 2, terminal B |
| Pin 7 | LED2+ β LED2 anode (input control side) |
| Pin 8 | LED2- β LED2 cathode (input control side) |
Typical Applications
PVT322SPBF is suitable for 6 applications: Instrumentation Multiplexing, Automatic Test Equipment (ATE) Matrix Switching, Industrial Process Control I/O, Telecom Line Switching, Programmable Logic Controller (PLC) Output Modules, Medical Equipment Isolation Switching.
Instrumentation Multiplexing
The PVT322SPBF's dual Form A switches and 250 V blocking rating make it ideal for instrumentation multiplexers that route analog signals between test points and measurement instruments. With 170 mA per pole it can carry both voltage and current-mode signals, while its photovoltaic isolation eliminates ground loops and protects sensitive ADC front-ends. Compared to reed relays, the solid-state design eliminates bounce and wear, supporting high test-cycle counts in production ATE. The 8-SMD package keeps channel density high, and the dual-pole configuration lets one part replace two single relays, reducing PCB area in scanner cards and switch matrices.
Recommended
Automatic Test Equipment (ATE) Matrix Switching
In ATE pin electronics and matrix switch cards, the PVT322SPBF provides quiet, bounce-free 250 V switching at 170 mA per channel, with the unlimited mechanical life required for high-throughput production test. Its photovoltaic drive means the switch side needs no external supply, simplifying high-channel-count card design. Compared to electromechanical relays, the PVT322SPBF offers faster settle times and zero acoustic noise, which improves measurement repeatability. The 8-SMD footprint allows dense matrix layouts, and the dual Form A configuration enables differential signal routing without two separate parts.
Recommended
Industrial Process Control I/O
The PVT322SPBF serves as an isolated digital output in PLC and DCS I/O modules that switch 24-240 V field devices. Its 250 V blocking and 170 mA continuous current comfortably cover solenoids, indicators, and low-power actuators, while the photovoltaic isolation between logic and field domains eliminates ground loops in long cable runs. Per the Infineon datasheet, the absence of moving parts provides long service life in vibration-prone plant environments. The dual-pole configuration lets one IC switch two independent field loads, halving component count versus single-channel relays.
Recommended
Telecom Line Switching
For telecom line cards and PBX interfaces, the PVT322SPBF provides 250 V isolation and 170 mA load handling needed for on-hook/off-hook line switching and ring-signal routing. Its photovoltaic MOSFET outputs introduce no audible noise and no contact bounce, eliminating the click of mechanical line relays. The dual Form A configuration lets one part handle both tip and ring switching, simplifying line-interface design. Compared to electro-mechanical telecom relays, the PVT322SPBF offers significantly longer life in high-cycle ringing and test applications.
Recommended
Programmable Logic Controller (PLC) Output Modules
In PLC digital output modules driving 120/240 V AC or 24-110 V DC field loads, the PVT322SPBF's dual-pole 250 V / 170 mA rating provides direct switching without additional buffer circuitry. The photovoltaic output requires no field-side supply, which simplifies isolated DC-DC converter design and reduces BOM cost. Per Infineon documentation, the unlimited mechanical life and bounce-free switching reduce field failures and improve module reliability. The 8-SMD package allows high channel density in compact PLC chassis.
Recommended
Medical Equipment Isolation Switching
The PVT322SPBF's photovoltaic isolation and 250 V blocking make it suitable for medical electronics that require patient-side isolation from control electronics, such as patient monitors, infusion pumps, and diagnostic instruments. Its quiet, bounce-free switching avoids the EMI and acoustic noise of mechanical relays that could interfere with sensitive analog front-ends. Per the Infineon datasheet, the 8-SMD form factor and dual Form A configuration let designers place isolation switching very close to sensor inputs, minimizing leakage paths. The part's solid-state reliability supports the long service life expected of medical devices.
Recommended
Recommended Products Summary
Engineering reference data for PVT322SPBF β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PVT322AS | PVT322S-TPBF | PVT322PBF | PVT322 |
|---|---|---|---|---|---|
| Brand | Infineon | Infineon | Infineon | Infineon | Infineon |
| Package | 8-SMD (0.300", 7.62 mm) | 8-SMD (0.300") - same | 8-SMD (0.300") - same | 8-SMD (0.300") - same | 8-SMD (0.300") - same |
| Contact Configuration | SPST-NO (1 Form A) x 2 | SPST-NO (1 Form A) x 2 | SPST-NO (1 Form A) x 2 | SPST-NO (1 Form A) x 2 | SPST-NO (1 Form A) x 2 |
| Load Voltage Rating | 0-250 V AC/DC | 0-250 V AC/DC | 0-250 V AC/DC | 0-250 V AC/DC | 0-250 V AC/DC |
| Continuous Load Current | 170 mA per pole | 170 mA per pole | 170 mA per pole | 170 mA per pole | 170 mA per pole |
| Pin Orientation | Standard (PBF) | Rotated (AS) | Standard (TPBF) | Standard (PBF) | Standard |
| Packaging Form | Tape & Reel | Tape & Reel | Tube | Tape & Reel | Tape & Reel |
| RoHS / Pb-Free | Yes (Pb-free) | Yes (Pb-free) | Yes (Pb-free) | Yes (Pb-free) | Yes (Pb-free) |
Key Differentiators
- Dual independent Form A channels in one 8-SMD package (vs PVT212SPBF (single-channel))
- Higher blocking voltage than single-pole photovoltaic relays (vs PVT212SPBF (60V))
- Photovoltaic drive - zero standby current on switch side (vs Conventional solid-state relays with auxiliary supply)
Design Notes
The PVT322SPBF input LED typically requires 5-10 mA of forward current for guaranteed full turn-on of the photovoltaic MOSFET outputs. Calculate the series resistor as R = (VCTRL - VF_LED) / ILED. For a 5 V logic supply with VF_LED approximately 1.3 V, R = (5 - 1.3) / 0.010 = 370 ohm (use 360 or 390 ohm standard). Place the resistor close to the LED anode pin to limit peak surge current during logic transients.
Do not exceed the 250 V load-voltage rating or 170 mA continuous load current per pole. The photovoltaic output MOSFET stack has higher on-resistance than a discrete power MOSFET - typically tens of ohms - so derate the load current at elevated ambient temperatures. For inductive loads, add a free-wheeling diode or snubber across the load to protect the MOSFET stack from voltage transients at turn-off.
Maintain adequate creepage and clearance between the input (LED) side and output (MOSFET switch) side of the PVT322SPBF to preserve the rated isolation voltage. The 8-SMD package provides internal isolation, but PCB layout must not bridge the two domains with copper traces. Place input and output copper pours on opposite sides of the package outline, and avoid routing signal traces under the body that would compromise isolation.
Compliance Information
PBF suffix indicates Pb-free terminal finish per Infineon documentation. RoHS compliant per manufacturer product page. AEC-Q100 not applicable - solid-state relay, not an automotive-qualified IC die.
