My Inquiry
My Account
Vishay General Semiconductor - Diodes Division P4SMA12AHM3/H
- Part No.:
- P4SMA12AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA12AHM3/H.pdf
- Description:
- TVS DIODE 10.2VWM 16.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,338
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
P4SMA12AHM3/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for clamping inductive switching transients and ESD events on power and signal lines. It features a 12 V breakdown voltage (VBR = 11.4–12.6 V at 1.0 mA), 10.2 V maximum stand-off voltage (VWM), and 16.7 V clamping voltage (VC) at 24.0 A peak pulse current, housed in an SMA (DO-214AC) package rated for 400 W peak pulse power (10/1000 µs).
For engineers reviewing the P4SMA12AHM3/H datasheet, P4SMA12AHM3/H pinout, P4SMA12AHM3/H application, or P4SMA12AHM3/H equivalent, this device serves as a halogen-free, AEC-Q101 qualified transient protector for automotive sensor interfaces, industrial I/O lines, and DC power rail surge suppression where low-leakage (<1.0 µA at VWM) and fast response (<1 ns) are critical.
Technical Context
The P4SMA12AHM3/H operates as a unidirectional avalanche diode with cathode-band polarity marking, leveraging glass-passivated junction technology for stable breakdown and low incremental surge resistance. Its clamping action begins near 10.2 V and limits transient excursions to ≤16.7 V under 24 A 10/1000 µs pulses, enabling robust protection of downstream MOSFETs and ICs without forward conduction during normal operation.
Thermally, it exhibits RθJA = 120 °C/W (junction-to-ambient, on minimum pad layout) and RθJL = 30 °C/W (junction-to-lead), supporting continuous power dissipation of 3.3 W at 50 °C ambient. The device is qualified to AEC-Q101 and meets JESD201 Class 2 whisker resistance and MSL Level 1 reflow requirements (260 °C peak).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 11.4 V / 12.6 V at 1.0 mA - defines precise avalanche onset threshold for reliable clamping initiation |
| VWM | 10.2 V - maximum continuous reverse operating voltage before leakage exceeds 1.0 µA |
| VC @ IPPM | 16.7 V at 24.0 A - peak clamped voltage during 10/1000 µs surge, limiting stress on protected circuitry |
| PPPM | 400 W - peak transient power handling capability, derated above 25 °C per Fig. 2 |
| IFSM | 40 A - single half-sine surge rating (8.3 ms), supporting high-energy inductive kickback events |
| TJ max | +150 °C - maximum junction temperature, enabling operation in under-hood automotive environments |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with 5.0 mm × 5.0 mm copper pad thermal design |
Pinout & Package
SMA (DO-214AC) package: molded epoxy case with matte tin-plated leads, cathode indicated by a band on the body. Mounting requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal for rated power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during reverse-biased clamping | Connected to protected line (e.g., VIN, signal trace); forms cathode-to-ground path when transient exceeds VWM |
| Cathode | Current exit point during clamping; marked with band | Typically tied to ground or low-impedance return path; determines unidirectional polarity and clamping direction |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JEDEC standards |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets automotive environmental compliance requirements without compromising surge performance or thermal stability |
| 400 W peak pulse power (10/1000 µs) | Supports protection against ISO 7637-2 Pulse 1/2a/3a and IEC 61000-4-5 Combination Wave surges |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving protection margin for sensitive 3.3 V/5 V logic |
| MSL Level 1, 260 °C peak reflow | Enables standard SMT assembly without moisture sensitivity concerns or baking requirements |
Applications
| Automotive Sensor Interface Protection | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and inductive switching noise in engine control units. IC Role / Device Role / Timing Role: Unidirectional TVS placed between sensor signal line and chassis ground to clamp transients before they reach the input amplifier or microcontroller ADC. Use Value: Limits voltage excursion to ≤16.7 V during 24 A surges, preserving signal integrity and preventing latch-up in 5 V-tolerant interface ICs. |
Use Scenario: Safeguarding 24 V digital input channels on programmable logic controllers exposed to relay coil flyback and field wiring surges. IC Role / Device Role / Timing Role: Standoff-rated TVS mounted across input terminals to shunt transient energy before it reaches optocoupler or Schmitt-trigger input stages. Use Value: Withstands repetitive 400 W pulses while maintaining <1.0 µA leakage at 10.2 V, ensuring stable logic-level recognition during normal operation. |
| DC Power Rail Surge Suppression | Consumer Device USB/UART Line Protection |
Use Scenario: Clamping 12 V supply rails in infotainment head units against battery disconnect transients and alternator load dump. IC Role / Device Role / Timing Role: Primary overvoltage clamp located upstream of DC-DC converters and LDOs to prevent overvoltage damage during system-level surges. Use Value: 40 A IFSM rating supports high-energy 8.3 ms half-sine events, complementing slower fuses or polymeric PTCs in layered protection schemes. |
Use Scenario: ESD and EFT protection on 3.3 V UART or USB VBUS lines in smart home hubs and portable medical devices. IC Role / Device Role / Timing Role: Fast-response TVS placed directly at connector entry point to divert sub-100 ns ESD strikes before reaching USB transceiver PHY. Use Value: Sub-nanosecond response time and 16.7 V clamping ensure <10 V stress on 3.3 V I/O pins during ±8 kV contact discharge (IEC 61000-4-2). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12A | Same VBR range (11.4–12.6 V), but SMB package (DO-214AA) offers higher thermal mass and 600 W PPPM | Preferred for higher-power industrial applications requiring >400 W surge handling or larger PCB pad area | Select SMBJ12A when board space allows larger footprint and higher peak power margin is needed |
| 1.5KE12A | Through-hole TO-204AE (DO-41) package, same electrical specs but lower mounting density and no AEC-Q101 qualification | Suitable for prototyping, legacy designs, or cost-sensitive non-automotive applications where SMT is not required | Choose 1.5KE12A only for non-automotive use cases where halogen-free compliance and MSL Level 1 are not mandatory |
Compared with SMBJ12A and 1.5KE12A, the P4SMA12AHM3/H delivers AEC-Q101 qualification, halogen-free construction, and optimized SMT manufacturability in the compact SMA footprint-making it the preferred choice for volume automotive and industrial surface-mount designs requiring regulatory compliance and automated assembly.
Availability
P4SMA12AHM3/H is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC inputs, and DC power rail surge suppression requiring stable component supply, halogen-free compliance, and AEC-Q101 qualification.
Supply support for P4SMA12AHM3/H 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, TVS devices, and power MOSFETs with emphasis on reliability, efficiency, and application-specific optimization.
The P4SMA series is engineered for high-reliability transient suppression in automotive, industrial, and telecom systems-delivering consistent clamping performance, AEC-Q101 validation, and SMT-ready packaging for demanding environments.
FAQ
What is the breakdown voltage tolerance for P4SMA12AHM3/H?
The P4SMA12AHM3/H has a specified breakdown voltage range of 11.4 V to 12.6 V at 1.0 mA test current, representing a ±5% tolerance around the nominal 12 V rating. This tight VBR window ensures predictable clamping onset and compatibility with 12 V system-level surge immunity requirements such as ISO 16750-2.
Is P4SMA12AHM3/H suitable for bidirectional transient protection?
No, P4SMA12AHM3/H is a unidirectional TVS diode, identified by its cathode band marking and specified electrical parameters for single-polarity clamping. For bidirectional protection, Vishay offers the P4SMA12CA variant; using P4SMA12AHM3/H in bidirectional configurations may result in forward conduction and failure during negative transients.
What does the "HM3" suffix indicate in P4SMA12AHM3/H?
The "HM3" suffix in P4SMA12AHM3/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It confirms compliance with automotive reliability standards, JESD201 Class 2 whisker resistance, and MSL Level 1 reflow capability-distinguishing it from commercial-grade "E3" or "M3" variants.
What is the maximum clamping voltage of P4SMA12AHM3/H under surge conditions?
The P4SMA12AHM3/H clamps to a maximum of 16.7 V at 24.0 A peak pulse current (10/1000 µs waveform). This value is guaranteed across temperature and represents the upper limit of voltage seen by protected circuitry during standardized surge events, enabling safe interfacing with 12 V and 15 V tolerant components.
How does P4SMA12AHM3/H perform in high-temperature environments?
P4SMA12AHM3/H is rated for continuous operation from –65 °C to +150 °C junction temperature. Its thermal resistance (RθJA = 120 °C/W) and derating curve (Fig. 2) allow sustained 3.3 W power dissipation at 50 °C ambient, making it suitable for under-hood automotive locations and enclosed industrial enclosures without forced cooling.
P4SMA12AHM3/H 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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 10.2V
- Voltage - Breakdown (Min):
- 11.4V
- Voltage - Clamping (Max) @ Ipp:
- 16.7V
- Current - Peak Pulse (10/1000µs):
- 24A
- 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)
P4SMA12AHM3/H FAQ
1.How can I place an order for P4SMA12AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA12AHM3/H 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 P4SMA12AHM3/H reliable?
The price and inventory of P4SMA12AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA12AHM3/H is usually 5 days.
3.What payment methods are accepted for P4SMA12AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA12AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA12AHM3/H?
P4SMA12AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA12AHM3/H 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 P4SMA12AHM3/H?
For technical support, including P4SMA12AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA12AHM3/H requirements.
6.How does Aetrix verify that P4SMA12AHM3/H is sourced from the original manufacturer or authorized distributors?
All P4SMA12AHM3/H 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 P4SMA12AHM3/H meets industry standards.
7.What is the process for return or replacement of P4SMA12AHM3/H?
All P4SMA12AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA12AHM3/H, 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 P4SMA12AHM3/H part is unused and in its original packaging.
Return procedure for P4SMA12AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMA12AHM3/H Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
