PVT312LS-TPBF - 250V 170mA SPST-NO Photo MOSFET Relay | Infineon
MPN: PVT312LS-TPBF β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.45 | $4.45 |
| 10 | $3.95 | $39.50 |
| 100 | $3.5 | $350.00 |
| 500 | $3.1 | $1,550.00 |
| 1,000 | $2.75 | $2,750.00 |
PVT312LS-TPBF Overview
A photovoltaic relay (also called a photorelay, Photo-MOS relay, or solid-state relay / SSR) is an optocoupler-style device that uses light from an internal LED to generate a photovoltaic voltage that turns on a MOSFET output stage. Compared with electromechanical relays, photorelays offer silent bounce-free switching, virtually unlimited switching cycles, low drive current (typically a few mA), and high input-to-output isolation (often 3.75 kVrms to 5 kVrms). They sit in the hierarchy: photorelay -> solid-state relay -> relay -> electromechanical component, and are widely used where long life, low power coil drive, and silent switching are required.
Key features include a GaAlAs LED input at 1.2 V typical forward voltage, integrated active current-limiting circuitry that withstands surge transients, 25 mA maximum forward current with 50 mA peak surge rating, and 5 mA typical LED turn-off current. The output HEXFET MOSFET provides bidirectional AC/DC switching capability, while the integrated photovoltaic driver eliminates the need for an external bias supply on the output side.
Typical applications include telecom line switching, instrumentation multiplexing, programmable logic controller (PLC) output modules, automatic test equipment (ATE), medical equipment patient isolation, and battery management isolation. The wide 0-250 V load range and SPST-NO (1 Form A) contact form suit both AC and DC loads.
A key design consideration is thermal management: although the SSR has low drive current, the on-state resistance (15 ohm max) produces I-squared-R dissipation, and the small SMD footprint has limited thermal headroom. Ensure PCB copper pours are adequate and that the LED drive circuit respects the minimum turn-on current (typically 2-5 mA) to guarantee reliable operation. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for PVT312LS-TPBF 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 PVT312LS-TPBF (same form factor and footprint) β differing in Package, RoHS Status, Mounting Type, Load Voltage Max, Load Current (AC, continuous).
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
PVT312LS
β Drop-Inπ Reference alternative (not in catalog)
PVT312SPBF
β Drop-Inβ In Stock
$3.22 / Unit
View Datasheet βPVT312S-TPBF
β Drop-In β οΈ εζ°εΎ ιͺθ―β In Stock
$3.85 / Unit
View Datasheet βPVT312LS-TPBF
β Drop-Inβ In Stock
$2.75 / Unit
View Datasheet βPVT312PBF
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
PVT312LS-TPBF Maximum Ratings & Electrical Characteristics
| Contact Configuration | SPST-NO (1 Form A) |
| Load Voltage (Max) | 250 V |
| Load Current (AC, Continuous) | 170 mA |
| Load Current (DC, Continuous) | 300 mA |
| On-State Resistance (Max) | 15 ohm |
| Input-to-Output Isolation | 4 kV |
| Forward Current If (Max) | 25 mA |
| Forward Current If (Peak) | 50 mA |
| LED Forward Voltage (Typical) | 1.2 V |
| Output Switch Technology | HEXFET Power MOSFET (bidirectional) |
| Input Driver | GaAlAs IR LED + photovoltaic generator |
| Package | 6-SMD (0.300 inch, 7.62 mm) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40C to +85C |
| MSL Level | 1 |
| RoHS Status | Compliant (TPBF suffix) |
PVT312LS-TPBF Pin Configuration
| Pin 1 | LED Anode (+) β LED input - connect to logic supply through current-limiting resistor |
| Pin 2 | LED Cathode (-) β LED input return - connect to logic ground |
| Pin 3 | NC β Not connected (per datasheet) |
| Pin 4 | MOSFET Drain/Source A β Output switch terminal A (bidirectional HEXFET) |
| Pin 5 | MOSFET Drain/Source B β Output switch terminal B (bidirectional HEXFET) |
| Pin 6 | NC β Not connected (per datasheet) |
Typical Applications
PVT312LS-TPBF is suitable for 6 applications: Telecom Line Switching, PLC and Industrial Output Modules, Automatic Test Equipment (ATE), Medical Equipment Patient Isolation, Battery Management Isolation, Instrumentation Multiplexing.
Telecom Line Switching
The PVT312LS-TPBF is purpose-built for telecom line-card switching, where its 250 V load voltage covers international ringing and battery voltages (including 48 V, 90 V ringing, and on-hook battery feeds). The integrated active current-limit circuitry withstands surge transients that occur when lines are connected or experience lightning-induced surges - a critical advantage over photorelays without current limiting. Placed between the line interface and the codec/slicer, the 4 kV isolation protects low-voltage DSP circuitry from line-side fault voltages. The 15 ohm on-state resistance is acceptable for voice-band signaling and DC feed, while the SSR replaces bulky electromechanical relays with silent operation that eliminates acoustic cross-talk on densely populated line cards. The 170 mA AC rating comfortably handles off-hook and ring-trip current levels.
Recommended
PLC and Industrial Output Modules
In PLC digital output modules, the PVT312LS-TPBF switches 24 V DC or 120/240 V AC loads with silent, bounce-free operation that eliminates the mechanical wear of electromechanical relays. Its 4 kV isolation satisfies IEC 61131-2 requirements for industrial control isolation barriers between field-side wiring and logic-side controllers. The 170 mA / 300 mA DC rating covers typical solenoid, relay-coil, and indicator-lamp loads, while the SPST-NO contact form simplifies wiring to standard PLC output terminal blocks. Placed at the output stage after the logic-level driver, the LED is driven by 5-10 mA from a microcontroller GPIO, eliminating the high-current coil-drive circuitry required by EMRs. The device's unlimited switching cycles support frequent pulsed-output applications like PWM heating control.
Recommended
Automatic Test Equipment (ATE)
In ATE switching matrices and instrumentation multiplexers, the PVT312LS-TPBF provides clean, low-noise signal routing with no contact bounce to disturb sensitive measurements. The 15 ohm on-state resistance is acceptable for switching test signals in the audio and low-frequency analog range, while the 250 V load voltage covers most bench instrument signal levels. The SSR's virtually unlimited switching cycles (versus ~1 million for EMRs) suits high-throughput production test where relays cycle hundreds of times per hour. Placed in reed-relay-replacement positions, the photorelay operates silently, eliminating the audible clicking that complicates acoustic testing. The 4 kV isolation protects expensive measurement instruments from DUT fault voltages.
Recommended
Medical Equipment Patient Isolation
The PVT312LS-TPBF's 4 kV input-to-output isolation meets IEC 60601-1 patient-isolation requirements for medical equipment that contacts patients while connected to mains-powered instruments. In patient monitoring, infusion pumps, and diagnostic equipment, the photorelay switches low-voltage signal lines with a guaranteed isolation barrier that protects patients from equipment faults. The GaAlAs LED input draws microampere-level current, enabling battery-powered designs without compromising isolation ratings. The solid-state construction eliminates mechanical failure modes that could create intermittent patient-isolation failures over time. The 250 V load voltage covers both low-voltage patient signals and mains-derived voltages used in equipment power stages, while the 170 mA current handles typical sensor excitation and signal-routing loads.
Recommended
Battery Management Isolation
In battery management systems (BMS) for electric vehicles and energy storage, the PVT312LS-TPBF provides galvanic isolation between high-voltage battery stacks and low-voltage control/MCU circuits. The 250 V load voltage covers typical 48 V and 96 V battery packs, while the 300 mA DC continuous current handles auxiliary load switching (precharge relays, contactor coils, balancing circuits). The 4 kV isolation satisfies UL 1973 and IEC 62619 requirements for battery system isolation. Placed between the AFE (analog front-end) monitor IC and the high-voltage bus, the SSR enables safe signal routing for cell-balancing control and module-to-module communication. The LED input draws only milliwatts, minimizing quiescent power drain on the low-voltage monitoring system.
Recommended
Instrumentation Multiplexing
In data-acquisition systems and instrumentation multiplexers, the PVT312LS-TPBF routes analog signals between multiple sensors and a single ADC, replacing mechanical reed relays with silent, long-life solid-state switching. The 15 ohm on-state resistance is acceptable for many sensor types (thermistors, RTDs, low-impedance transducers), and the bounce-free switching eliminates transient errors during channel transitions. The 250 V load voltage allows direct switching of Β±100 V sensor excitation signals, while the 4 kV isolation protects sensitive front-end amplifiers from common-mode transients. The photorelay's wide operating temperature (-40C to +85C) supports industrial and outdoor instrumentation. The virtually unlimited switching cycles suit continuous data-logging applications where channels switch thousands of times per day.
Recommended
Recommended Products Summary
Engineering reference data for PVT312LS-TPBF β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PVT312LS | PVT312SPBF | PVT312S-TPBF | PVT312PBF |
|---|---|---|---|---|---|
| Package | 6-SMD (0.300 inch, 7.62 mm) | 6-SMD (0.300 inch, 7.62 mm) - same | 6-SMD (0.300 inch, 7.62 mm) - same | 6-SMD (0.300 inch, 7.62 mm) - same | 6-SMD (0.300 inch, 7.62 mm) - same |
| Brand | Infineon Technologies | Infineon Technologies - same | Infineon Technologies - same | Infineon Technologies - same | Infineon Technologies - same |
| Load Voltage (Max) | 250 V | 250 V | 250 V | 250 V | 250 V |
| Load Current (AC) | 170 mA | 170 mA | 170 mA | 170 mA | 170 mA |
| Active Current Limit | Yes (LS suffix) | Yes | No | No | No |
| On-State Resistance (Max) | 15 ohm | 15 ohm | 15 ohm | 15 ohm | 15 ohm |
| Isolation Voltage | 4 kV | 4 kV | 4 kV | 4 kV | 4 kV |
| Packaging Form | Tape & Reel (TPBF) | Tube | Tube | Tape & Reel | Tube |
Key Differentiators
- Integrated active current-limit circuitry (vs PVT312SPBF)
- Tape-and-reel packaging for high-volume assembly (vs PVT312LS (tube))
- 4 kV isolation exceeds industry standard (vs PVT412)
Design Notes
At maximum 170 mA load current and 15 ohm on-state resistance, the PVT312LS-TPBF dissipates approximately 0.43 W in the output MOSFET. The 6-SMD package has limited thermal headroom; provide adequate PCB copper pours beneath and around the output pins to spread heat. Estimated: at 0.43 W dissipation with theta_JA of approximately 80 C/W (typical for 6-SMD with minimum footprint), junction temperature rises 35 C above ambient - acceptable but verify with thermal measurements in your specific PCB layout. For continuous 170 mA operation, increasing the copper area to 1 square inch reduces theta_JA to approximately 40 C/W.
Maintain adequate creepage and clearance distance between the LED-side pins (1, 2) and the output-side pins (4, 5) on the PCB to preserve the 4 kV isolation rating. Use a slot or cut in the PCB if necessary to achieve 4 mm minimum clearance for 250 V working voltage applications. The output MOSFET pins are bidirectional - either pin can be the source or drain, simplifying PCB layout. Place a 0.1 uF bypass capacitor across the LED pins if the LED drive signal is from a long cable or high-impedance source, to prevent false triggering from capacitive coupling.
Do not exceed 25 mA continuous LED forward current or 50 mA peak surge - the LED will degrade. The minimum LED turn-on current is approximately 2-5 mA; designing for 10 mA provides margin across temperature and unit-to-unit variation. Do not use the photorelay to switch DC voltages above its maximum load voltage rating, even momentarily - the output MOSFET will avalanche and fail. Note that the output is bidirectional - no internal protection against reverse polarity, so external TVS diodes may be required for inductive loads. The LS suffix denotes active current limiting - do not confuse with the standard PVT312S which lacks this protection.
Compliance Information
RoHS compliant per TPBF suffix; lead-free per Infineon product page. AEC-Q100 not applicable - choose automotive-grade variant if needed. EU RoHS and REACH compliance confirmed.
