PVAZ172NSPBF - 60V 1A Photo-Voltaic SSR Relay | Infineon
MPN: PVAZ172NSPBF β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.4 | $9.40 |
| 10 | $8.95 | $89.50 |
| 100 | $7.82 | $782.00 |
| 500 | $6.9 | $3,450.00 |
| 1,000 | $6.15 | $6,150.00 |
PVAZ172NSPBF Overview
A solid-state relay (SSR) is a semiconductor switching device that uses an optically-coupled or magnetically-coupled isolation barrier to control a load without moving parts. Photovoltaic relays are a subtype that generate a floating gate-drive voltage internally from the LED input, allowing direct switching of isolated DC and AC loads without an external bias supply. They sit in the broader electromechanical hierarchy of relays and are classified under Power Management and Electromechanical > Relays in distributor catalogs. Photovoltaic relays trade the long life and silent operation of MOSFET-only SSRs for higher current capability than typical phototriac SSRs.
Key features of the PVAZ172NSPBF include 60 V load voltage maximum (AC or DC), 1 A continuous load current, 0.5 ohm maximum on-state resistance, 4 kVrms I/O isolation voltage, 25 mA nominal LED forward current, and SPST-NO (1 Form A) contact configuration. The 8-SMD modified package (0.300 inch, 7.62 mm body, 4 leads) simplifies PCB layout and provides high isolation in a compact footprint.
At the circuit level, the device integrates an AlGaAs infrared LED optically coupled to a photovoltaic generator that drives the gates of two series MOSFETs. When the LED is biased, the photogenerated voltage exceeds the MOSFET threshold and turns the output on with no moving parts, eliminating contact bounce and arcing.
Typical applications include industrial control modules, programmable logic controller (PLC) outputs, battery monitoring systems, and instrumentation multiplexers. The wide load-voltage range supports both 24 V DC industrial rails and 48 V AC telecom signal lines, while the high isolation protects low-voltage microcontrollers from transients on the field side.
Design tip: provide adequate PCB creepage between the input pins (1-4) and the output pins (5-8) to preserve the rated 4 kV isolation in production boards, and add an RC snubber across inductive loads to limit dv/dt-induced false turn-on.
This page synthesizes distributor pricing, drop-in alternatives in the same 8-SMD package, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for PVAZ172NSPBF 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 PVAZ172NSPBF (same form factor and footprint) β differing in Load Voltage Max, Package, RoHS Status.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
PVAZ172NSPBF
β Drop-Inβ In Stock
$6.15 / Unit
View Datasheet βPVG612ASPBF
β Drop-Inβ In Stock
$2.65 / Unit
View Datasheet βPVAZ172N
β Drop-Inπ Reference alternative (not in catalog)
CPC1017NTR
β Drop-Inπ Reference alternative (not in catalog)
CPC1018N
β Drop-Inπ Reference alternative (not in catalog)
PLA140
β Drop-Inπ Reference alternative (not in catalog)
PVAZ172NSPBF Maximum Ratings & Electrical Characteristics
| Contact Configuration | SPST-NO (1 Form A) |
| Load Voltage Max | 60 V (AC or DC) |
| Load Current Max | 1 A |
| On-State Resistance Max (RDS(on)) | 0.5 ohm |
| Isolation Voltage | 4 kVrms (input-to-output) |
| Forward Current (IF) Typical | 25 mA |
| Relay Terminals | SMD |
| Package | 8-SMD (0.300 inch, 7.62 mm), 4 leads |
| Mounting Type | Surface Mount |
| Output Type | AC, DC (photovoltaic MOSFET) |
| RoHS Status | Compliant (Pb-free PBF suffix) |
| Lead-Free | Yes (PBF suffix indicates lead-free) |
PVAZ172NSPBF Pin Configuration
| Pin 1 | LED Anode (+) β Input LED anode, drive with 25 mA nominal |
| Pin 2 | LED Cathode (-) β Input LED cathode, return to driver ground |
| Pin 3 | NC β Not connected (per datasheet) |
| Pin 4 | NC β Not connected (per datasheet) |
| Pin 5 | MOSFET Drain/Source A β Output terminal A of the photovoltaic MOSFET pair |
| Pin 6 | MOSFET Drain/Source B β Output terminal B of the photovoltaic MOSFET pair |
| Pin 7 | NC β Not connected (per datasheet) |
| Pin 8 | NC β Not connected (per datasheet) |
Typical Applications
PVAZ172NSPBF is suitable for 6 applications: Industrial PLC Digital Output Module, Battery Monitoring and Protection System, Telecom Line-Card Signaling Switch, Medical Patient Monitoring Multiplexer, Automated Test Equipment (ATE) Switch Matrix, HVAC Building Automation Relay Driver.
Industrial PLC Digital Output Module
The PVAZ172NSPBF is ideal for industrial PLC digital output modules driving 24 V DC field loads up to 1 A. Its 4 kVrms input-to-output isolation protects the backplane logic from field-side transients and surges, while the 0.5 ohm on-state resistance keeps conduction loss to roughly 0.5 W at full load, manageable without a heatsink. The 8-SMD modified package (0.300 inch body) saves board area versus through-hole electromechanical relays and eliminates contact bounce, simplifying PLC firmware debounce routines. Designers should add an RC snubber (100 ohm + 100 nF) across inductive loads to suppress dv/dt-induced false turn-on.
Recommended
Battery Monitoring and Protection System
In 48 V battery monitoring and protection modules, the PVAZ172NSPBF switches sense-resistor shunts and cell-balancing paths with silent, bounce-free operation. Its 60 V load-voltage rating comfortably covers 48 V nominal battery stacks, while the 1 A continuous current handles cell-balancing currents typical of Li-ion management. The photovoltaic drive eliminates the auxiliary bias supply needed by some competing SSRs, simplifying the BOM. The 4 kV isolation also protects the low-voltage BMS controller from high-voltage transients during pack switching events.
Recommended
Telecom Line-Card Signaling Switch
For telecom line-card ringing and signaling switches, the PVAZ172NSPBF provides silent AC line switching up to 60 V at 1 A, replacing bulky electromechanical relays that suffer contact wear in high-cycle environments. The 4 kVrms isolation meets telecom surge and hipot requirements, and the 25 mA LED drive current is directly compatible with 5 V logic-level buffers or optocoupler interfaces. Compared with mechanical 1 Form A telecom relays, the PVAZ172NSPBF reduces board area by roughly 60 percent and eliminates acoustic clicking during line tests.
Recommended
Medical Patient Monitoring Multiplexer
In medical patient monitoring equipment such as ECG and EEG front-end multiplexers, the PVAZ172NSPBF provides low-leakage, low-noise signal routing with 4 kVrms patient-isolation. Its solid-state design eliminates the mechanical relay click that can disturb sensitive bioelectric measurements, and the 0.5 ohm on-state resistance minimizes signal-path attenuation for instrumentation-grade signals. The 8-SMD package fits compact, handheld monitor designs where board area is at a premium, and the device's Pb-free (PBF) finish supports compliance with IEC 60601-1 medical safety standards when properly board-level isolated.
Recommended
Automated Test Equipment (ATE) Switch Matrix
In ATE switch matrices for semiconductor and PCB testing, the PVAZ172NSPBF enables fast, repeatable signal routing with sub-millisecond switching speeds and no mechanical wear over millions of cycles. Its 60 V / 1 A rating covers most analog and digital test signals, while 4 kV isolation protects expensive tester pin electronics from DUT-side faults. Compared with reed relays, the PVAZ172NSPBF offers lower drive power and higher isolation, at the cost of slightly higher on-resistance that is usually negligible in high-impedance test paths.
Recommended
HVAC Building Automation Relay Driver
For HVAC building automation systems controlling 24 V AC damper actuators and valve solenoids, the PVAZ172NSPBF provides silent, long-life switching in a compact 8-SMD footprint. The 60 V / 1 A rating covers 24 V AC control circuits and 48 V DC equipment, with 4 kV isolation protecting low-voltage building controllers from field wiring transients. Its solid-state reliability reduces maintenance calls versus mechanical relays that wear out in high-cycle damper-actuator service, and the Pb-free (PBF) finish supports RoHS-compliant building automation installations.
Recommended
Recommended Products Summary
Engineering reference data for PVAZ172NSPBF β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PVG612ASPBF | PVAZ172N | CPC1017NTR | CPC1018N | PLA140 |
|---|---|---|---|---|---|---|
| Package | 8-SMD (0.300 inch, 7.62 mm) | 8-SMD (0.300 inch, 7.62 mm) - same | 8-SMD (0.300 inch, 7.62 mm) - same | 8-SMD (0.300 inch, 7.62 mm) - same | 8-SMD (0.300 inch, 7.62 mm) - same | 8-SMD (0.300 inch, 7.62 mm) - same |
| Brand | Infineon | Infineon | Infineon | IXYS (Littelfuse) | IXYS (Littelfuse) | IXYS (Littelfuse) |
| Load Voltage Max | 60 V | 60 V | 60 V | 60 V | 60 V | 60 V |
| Load Current Max | 1 A | 1 A | 1 A | 1 A | 1.2 A | 1 A |
| On-State Resistance Max | 0.5 ohm | 0.5 ohm | 0.5 ohm | 0.8 ohm | 0.6 ohm | 0.5 ohm |
| Isolation Voltage | 4 kVrms | 4 kVrms | 4 kVrms | 4 kVrms | 4 kVrms | 3.75 kVrms |
| Forward Current (IF) Typical | 25 mA | 25 mA | 25 mA | 5 mA | 5 mA | 10 mA |
| Contact Configuration | SPST-NO (1 Form A) | SPST-NO (1 Form A) | SPST-NO (1 Form A) | SPST-NO (1 Form A) | SPST-NO (1 Form A) | SPST-NO (1 Form A) |
| RoHS / Lead-Free | Yes (PBF) | Yes (PBF) | No (SnPb) | Yes | Yes | Yes |
Key Differentiators
- Industry-standard 8-SMD modified package with proven 4 kVrms isolation (vs PVAZ172N (non-Pb-free variant))
- Lower on-state resistance than cross-brand equivalent (vs CPC1017NTR (IXYS/Littelfuse))
- Higher LED drive current tolerance for robust industrial environments (vs CPC1018N (IXYS/Littelfuse))
Design Notes
Maintain at least 8 mm of PCB creepage between input pins (1-2) and output pins (5-6) of the PVAZ172NSPBF to preserve the rated 4 kVrms isolation in production boards. Remove solder mask and avoid copper traces, vias, or silkscreen in the isolation gap to prevent surface arcing during hipot testing. According to the manufacturer datasheet, the 8-SMD modified package provides internal clearance, but PCB layout is the designer's responsibility to meet end-equipment safety standards such as IEC 61010-1 or IEC 60601-1.
Always add an RC snubber (typically 100 ohm in series with 100 nF, or a 39 ohm + 0.01 uF MOV combination) across inductive loads driven by the PVAZ172NSPBF. Without snubbing, the dv/dt generated when switching off solenoids, transformers, or relays can exceed the device's dv/dt rating and cause false turn-on of the output MOSFETs. The PV relay is polarity-agnostic on the load side, but the snubber resistor should be sized to limit peak load voltage to within 1.5x the rated 60 V during transients.
Estimated: At 1 A continuous load current and 0.5 ohm on-state resistance, the PVAZ172NSPBF dissipates approximately 0.5 W (IΒ² Γ R). The 8-SMD package has a typical junction-to-ambient thermal resistance of approximately 100 C/W on a 1 oz copper 4-layer PCB, leading to a 50 C junction temperature rise above ambient at full load. Derate above 50 Β°C ambient or increase PCB copper area under the output pins to keep junction below 125 Β°C maximum. For sustained 1 A loads in enclosed enclosures, verify thermal performance with a thermocouple on the package body.
Drive the input LED of the PVAZ172NSPBF with a constant-current source of 5-25 mA rather than a simple resistor, to compensate for LED forward-voltage variation over temperature. A typical NPN transistor current source or a dedicated LED driver such as the Infineon BCR402U provides stable bias and avoids turn-off at low temperatures. Below 5 mA the photovoltaic output voltage may not reliably exceed the MOSFET gate threshold, causing high on-resistance; above 25 mA the LED lifetime degrades.
Compliance Information
RoHS compliant per Infineon PBF suffix designation. Pb-free terminal finish (matte tin). Not AEC-Q100 qualified (industrial/consumer grade SSR). Halogen-free status not explicitly stated in provided data.
