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Vishay General Semiconductor - Diodes Division P4SMA51CAHM3/I
- Part No.:
- P4SMA51CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA51CAHM3/I.pdf
- Description:
- TVS DIODE 43.6VWM 70.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,117
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Product details
Overview
P4SMA51CAHM3/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in the P4SMA series, designed for clamping voltage transients on signal or power lines. It features a 51 V breakdown voltage (VBR = 48.5–53.6 V at 1 mA), 70.1 V maximum clamping voltage (VC) at 5.7 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - suitable for protecting automotive sensor interfaces and industrial I/O lines against ESD and inductive switching surges.
For engineers reviewing the P4SMA51CAHM3/I datasheet, P4SMA51CAHM3/I pinout, P4SMA51CAHM3/I application, or P4SMA51CAHM3/I equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, SMA (DO-214AC) package details, clamping performance under standardized surge conditions, and direct alternatives for automotive-grade transient protection design.
Technical Context
The P4SMA51CAHM3/I operates as a bidirectional avalanche diode, symmetrically clamping voltage excursions above ±51 V in either polarity without polarity marking. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance, enabling fast response (<1 ns) to transient events such as ISO 7637-2 load dump spikes or IEC 61000-4-2 ESD pulses.
Rated for 150 °C maximum junction temperature and compliant with J-STD-020 MSL Level 1 (peak reflow 260 °C), it supports automated SMT assembly. The device delivers 400 W peak pulse power up to 91 V nominal VWM, derating to 300 W above that threshold - consistent with its 3.3 W steady-state power dissipation limit and 120 °C/W junction-to-ambient thermal resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 48.5 V / 53.6 V at 1 mA test current - defines precise clamping onset threshold for bidirectional overvoltage events |
| VWM | 43.6 V - maximum continuous reverse working voltage before leakage exceeds 1 µA; sets safe operating margin below breakdown |
| VC @ IPPM | 70.1 V at 5.7 A - clamped voltage during 10/1000 µs surge; determines protected circuit's maximum stress level |
| PPPM | 400 W - peak pulse power handling capability; enables robust protection against repetitive transients in automotive environments |
| IPPM | 5.7 A - peak pulse current supported at rated clamping voltage; used to size PCB trace width and layout thermal relief |
| TJ max. | 150 °C - maximum junction temperature; supports operation in under-hood automotive locations with minimal heatsinking |
| AEC-Q101 | Qualified - validated for automotive applications including engine control units, body electronics, and ADAS sensor interfaces |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. No polarity marking for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; common node for bidirectional conduction path | Connected to line being protected; forms symmetrical clamping path with cathode during both positive and negative transients |
| Cathode | Current exit terminal in forward bias; common node for bidirectional conduction path | Connected to reference plane (e.g., ground or supply rail); completes low-impedance shunt path during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| 400 W peak pulse power (10/1000 µs) | Handles high-energy transients typical of automotive load dump and industrial relay switching |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive reliability requirements including temperature cycling, humidity, and mechanical shock |
| MSL Level 1 (260 °C peak reflow) | Supports standard lead-free SMT assembly without moisture sensitivity limitations or baking requirements |
| Glass passivated junction | Ensures stable VBR tolerance and low leakage across temperature and lifetime |
Applications
| Automotive Sensor Interface Protection | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: Protecting CAN, LIN, or analog sensor lines (e.g., oxygen, pressure, temperature sensors) from ESD and load dump in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional TVS diode placed between signal line and chassis ground to clamp transients before they reach downstream ASIC or MCU inputs. Use Value: Maintains signal integrity by limiting voltage excursion to ≤70.1 V during 5.7 A surges, preventing latch-up or gate oxide damage in AEC-Q100 qualified ICs. |
Use Scenario: Safeguarding 24 V digital input modules in programmable logic controllers against field-wiring induced surges and relay contact bounce. IC Role / Device Role / Timing Role: Shunt protector mounted directly at connector entry point to divert transient energy away from optocoupler or Schmitt trigger input stages. Use Value: Withstands 400 W pulses without degradation, ensuring long-term reliability in factory automation environments with frequent electromagnetic disturbances. |
| Telecom Line Interface Surge Suppression | Consumer Appliance Motor Control Protection |
Use Scenario: Guarding RS-485 or Ethernet PHY interface lines in base station equipment against lightning-induced surges and AC power cross-talk. IC Role / Device Role / Timing Role: Primary-level TVS placed before common-mode choke and differential receiver to absorb common-mode transients before filtering stage. Use Value: Low clamping voltage (70.1 V) preserves receiver common-mode range while meeting IEC 61000-4-5 Level 3 (1 kV/2 Ω) immunity requirements. |
Use Scenario: Shielding microcontroller GPIOs and gate drivers in washing machine or HVAC motor control boards from back-EMF spikes generated by brushed DC or BLDC motors. IC Role / Device Role / Timing Role: Localized TVS at motor driver output stage to suppress inductive kickback before it couples into logic supply rails. Use Value: Fast response time and 150 °C junction rating allow placement near heat-generating MOSFETs without thermal derating penalties. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51CA | Higher 600 W PPPM, larger SMB (DO-214AA) package, 73.5 V VC at 8.2 A | Better suited for higher-energy transients but requires larger PCB footprint and different pad layout | Select when surge energy exceeds 400 W or when existing design uses SMB footprint |
| 1.5KE51CA | Through-hole DO-201 package, 51 V VBR, 73.5 V VC at 8.2 A, 1500 W PPPM | Designed for prototyping or legacy through-hole systems; not SMT-compatible | Choose only for manual assembly, repair, or non-automated production where SMT is unavailable |
Compared with P4SMA51CAHM3/I, SMBJ51CA offers higher surge capacity in a larger surface-mount package, while 1.5KE51CA provides legacy through-hole compatibility at significantly higher peak power - neither is pin-compatible, but both serve overlapping protection functions in distinct mechanical contexts.
Availability
P4SMA51CAHM3/I is available at Aetrix Electronics and suitable for automotive electronics, industrial control systems, and telecom infrastructure requiring stable component supply with AEC-Q101 qualification and halogen-free compliance.
Supply support for P4SMA51CAHM3/I 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and automotive-grade validation.
The P4SMA series targets cost-sensitive, high-volume transient protection needs in automotive, industrial, and consumer applications - delivering standardized TVS performance in compact SMA packages with AEC-Q101 and RoHS options.
FAQ
What does the "HM3" suffix indicate in P4SMA51CAHM3/I?
The HM3 suffix in P4SMA51CAHM3/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It confirms the device meets automotive reliability standards and environmental regulations, and is packaged on 13-inch tape (I) for high-volume SMT assembly. This distinguishes it from commercial-grade M3 or E3 variants lacking automotive qualification.
Is P4SMA51CAHM3/I unidirectional or bidirectional?
P4SMA51CAHM3/I is a bidirectional TVS diode, as indicated by the "CA" suffix. It provides symmetrical clamping for both positive and negative voltage transients without polarity marking on the SMA package. This makes it ideal for protecting AC-coupled signals, differential buses like CAN, or floating sensor outputs where polarity reversal may occur.
What is the maximum clamping voltage of P4SMA51CAHM3/I under surge conditions?
The maximum clamping voltage (VC) of P4SMA51CAHM3/I is 70.1 V at 5.7 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured per industry-standard surge testing and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Does P4SMA51CAHM3/I require a heatsink for normal operation?
No, P4SMA51CAHM3/I does not require an external heatsink under typical surge duty cycles. Its 3.3 W steady-state power dissipation and 120 °C/W junction-to-ambient thermal resistance are designed for operation on standard 0.2" × 0.2" copper pads. Heatsinking is unnecessary unless subjected to sustained high-frequency repetitive surges exceeding datasheet derating curves.
How does P4SMA51CAHM3/I compare to P4SMA51A in terms of functionality?
P4SMA51CAHM3/I is the bidirectional, AEC-Q101 qualified, halogen-free version of the P4SMA51A family. While P4SMA51A is unidirectional and commercial-grade, P4SMA51CAHM3/I supports symmetrical clamping and automotive use cases. Both share identical VBR, VWM, and VC specifications, but differ in polarity, qualification, and material compliance - making P4SMA51CAHM3/I unsuitable as a drop-in replacement for unidirectional designs without layout review.
P4SMA51CAHM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- P4SMA, TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 43.6V
- Voltage - Breakdown (Min):
- 48.5V
- Voltage - Clamping (Max) @ Ipp:
- 70.1V
- Current - Peak Pulse (10/1000µs):
- 5.7A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
P4SMA51CAHM3/I FAQ
1.How can I place an order for P4SMA51CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA51CAHM3/I 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 P4SMA51CAHM3/I reliable?
The price and inventory of P4SMA51CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA51CAHM3/I is usually 5 days.
3.What payment methods are accepted for P4SMA51CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA51CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA51CAHM3/I?
P4SMA51CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA51CAHM3/I 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 P4SMA51CAHM3/I?
For technical support, including P4SMA51CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA51CAHM3/I requirements.
6.How does Aetrix verify that P4SMA51CAHM3/I is sourced from the original manufacturer or authorized distributors?
All P4SMA51CAHM3/I 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 P4SMA51CAHM3/I meets industry standards.
7.What is the process for return or replacement of P4SMA51CAHM3/I?
All P4SMA51CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA51CAHM3/I, 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 P4SMA51CAHM3/I part is unused and in its original packaging.
Return procedure for P4SMA51CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMA51CAHM3/I Tags
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