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Taiwan Semiconductor Corporation P4SMA12H
- Part No.:
- P4SMA12H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA12H.pdf
- Description:
- 400W, 12V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:5,225
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Product details
Overview
P4SMA12H from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, rated for 400W peak pulse power, 10.8–13.2V breakdown voltage (VBR), and 17.3V clamping voltage (VC) at 24A peak impulse current. It protects DC/DC converters and SMPS inputs against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the P4SMA12H datasheet, P4SMA12H pinout, P4SMA12H application, or P4SMA12H equivalent, key selection criteria include its 9.72V working stand-off voltage (VWM), <1μA reverse leakage at VWM, AEC-Q101 qualification, glass-passivated junction, and fast sub-1ps response time-critical for automotive-grade board-level surge immunity.
Technical Context
The P4SMA12H employs a single-die, unidirectional silicon avalanche structure with glass-passivated junction for stable breakdown and low leakage. Its clamping behavior follows standardized 10/1000μs waveform testing per ANSI/IEEE C62.35, delivering consistent 17.3V VC at 24A IPPM under defined surge conditions.
Designed for automotive and industrial environments, it operates across –55°C to +150°C junction temperature range and meets JESD201 Class 2 whisker resistance, UL 94V-0 molding compound, and moisture sensitivity level 1 per J-STD-020-enabling reliable reflow assembly without preconditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR @ IT=1mA | 10.8–13.2V: Ensures reliable avalanche initiation above circuit operating voltage while avoiding false triggering |
| VWM | 9.72V: Maximum continuous reverse voltage before significant leakage; sets safe margin below system rail |
| VC @ IPPM=24A | 17.3V: Clamped voltage during 10/1000μs surge; defines worst-case stress on downstream ICs |
| PPPM | 400W: Peak pulse power handling capability per single non-repetitive event per Fig.5 |
| IR @ VWM | <1μA: Ultra-low leakage preserves battery life and signal integrity in always-on circuits |
| TJ max | +150°C: Enables placement near hot components (e.g., MOSFETs, inductors) without thermal derating |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, cathode-banded unidirectional configuration. Matte tin-plated leads, RoHS and halogen-free compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path / Surge return path | Connected to protected line's low-side reference (e.g., GND or negative rail) |
| Cathode | Avalanche clamping node / Transient sink | Connected to protected line (e.g., 12V input); conducts surge current to anode when VAK exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements (HTOL, TCT, ESD, etc.) |
| Glass-passivated junction | Stable VBR tolerance and low IR drift over temperature and lifetime |
| Fast response time <1ps | Clamps transients before sensitive logic or analog circuitry responds |
| ISO 7637-2 compliance | Withstands automotive load dump and inductive switching pulses without degradation |
| Moisture sensitivity level 1 | Zero bake requirement before SMT reflow-reduces manufacturing cost and risk |
Applications
| Automotive Body Control Module (BCM) | Industrial DC/DC Converter Input |
|---|---|
Use Scenario: Protects 12V supply rail of BCM microcontrollers and CAN transceivers from alternator load dump and inductive kickback. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 12V input and chassis ground to clamp surges to ≤17.3V. Use Value: Prevents latch-up or permanent damage to 5V/3.3V LDOs and MCU I/Os by limiting transient overvoltage within their absolute maximum ratings. | Use Scenario: Shields isolated flyback or buck converter primary-side controller ICs from reflected switching noise and ESD events. IC Role / Device Role / Timing Role: Mounted at DC input terminal to absorb repetitive 400W pulses without thermal runaway. Use Value: Maintains system uptime by eliminating field failures caused by undamped voltage spikes exceeding 20V on 12V nominal rails. |
| LED Driver Power Supply | USB-C PD Adapter Secondary Side |
Use Scenario: Safeguards constant-current LED driver ICs from surge coupling through AC/DC front-end rectifiers. IC Role / Device Role / Timing Role: Placed across bulk capacitor to suppress differential-mode transients induced by lightning or grid switching. Use Value: Extends LED module lifetime by preventing premature failure of high-side MOSFET gate drivers due to VDS overstress. | Use Scenario: Protects secondary-side synchronous rectifier controllers and optocoupler feedback paths in compact USB-C PD adapters. IC Role / Device Role / Timing Role: Installed between 20V output rail and ground to clamp fast-rising ESD and surge events during plug insertion. Use Value: Ensures USB-IF certification compliance by limiting transient overshoot to <25V during 8kV contact discharge tests. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12A | DO-214AA (SMB) package; 600W rating; slightly higher VC = 19.9V @ 30.1A | Higher power handling but larger footprint; less suitable for ultra-dense automotive PCBs | Choose SMBJ12A only if layout allows SMB pad area and system requires >400W surge margin |
| 1.5SMC12A | DO-214AB (SMC) package; 1500W rating; VC = 19.9V @ 75.5A; higher thermal mass | Over-specified for 400W use cases; incompatible with SMA-reflow profiles due to larger thermal inertia | Select 1.5SMC12A only for legacy designs already using SMC footprints or where multi-pulse robustness is critical |
Compared with SMBJ12A and 1.5SMC12A, the P4SMA12H offers optimal balance of space-constrained DO-214AC packaging, AEC-Q101 qualification, and precise 17.3V clamping-making it preferred for new automotive and compact industrial designs requiring verified surge immunity without footprint bloat.
Availability
P4SMA12H is available at Aetrix Electronics and suitable for automotive body electronics, industrial DC/DC converters, LED lighting drivers, and USB-C PD adapter designs requiring stable component supply and full traceability.
Supply support for P4SMA12H 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, and rectifiers with global automotive and industrial certifications.
The P4SMA12H belongs to TSC's AEC-Q101-qualified P4SMAxH series-engineered specifically for robust, surface-mount transient suppression in harsh automotive and industrial power rails.
FAQ
What is the maximum clamping voltage of the P4SMA12H under standard surge conditions?
The P4SMA12H has a maximum clamping voltage (VC) of 17.3V when subjected to a 10/1000μs waveform at 24A peak impulse current (IPPM). This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during transient events-critical for ensuring downstream ICs remain within their absolute maximum ratings.
Is the P4SMA12H suitable for bidirectional transient protection?
No, the P4SMA12H is a unidirectional TVS diode intended for DC line protection with defined polarity. For bidirectional applications (e.g., AC lines or data lines), TSC offers the P4SMA12AH variant or bipolar parts with CH/CAH suffixes. Using P4SMA12H in reverse-biased configurations may result in uncontrolled forward conduction and inadequate protection.
Does the P4SMA12H require moisture preconditioning before reflow soldering?
No, the P4SMA12H has a moisture sensitivity level (MSL) of 1 per J-STD-020, meaning it can be stored indefinitely at ambient conditions and placed directly into standard lead-free reflow profiles without baking. This eliminates process steps, reduces cost, and avoids thermal stress on the die or mold compound.
What automotive standards does the P4SMA12H comply with?
The P4SMA12H is AEC-Q101 qualified and meets ISO 7637-2 test requirements for Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling). These certifications validate its reliability in 12V automotive electrical systems exposed to real-world transients such as alternator load dump and relay coil de-energization.
How does the glass passivation of the P4SMA12H improve long-term reliability?
Glass passivation on the P4SMA12H's silicon junction prevents oxidation and contamination at the chip surface, resulting in stable breakdown voltage (VBR) tolerance, minimal drift over temperature and time, and reduced risk of parametric shift during extended operation-especially important in automotive modules with 15+ year service life expectations.
P4SMA12H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AC, SMA
- Series:
- P4SMA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 9.72V
- Voltage - Breakdown (Min):
- 10.8V
- Voltage - Clamping (Max) @ Ipp:
- 17.3V
- Current - Peak Pulse (10/1000µs):
- 24A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
P4SMA12H FAQ
1.How can I place an order for P4SMA12H through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA12H 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 P4SMA12H reliable?
The price and inventory of P4SMA12H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA12H is usually 5 days.
3.What payment methods are accepted for P4SMA12H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA12H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA12H?
P4SMA12H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA12H 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 P4SMA12H?
For technical support, including P4SMA12H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA12H requirements.
6.How does Aetrix verify that P4SMA12H is sourced from the original manufacturer or authorized distributors?
All P4SMA12H 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 P4SMA12H meets industry standards.
7.What is the process for return or replacement of P4SMA12H?
All P4SMA12H units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA12H, 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 P4SMA12H part is unused and in its original packaging.
Return procedure for P4SMA12H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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