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Taiwan Semiconductor Corporation P4SMA12AH
- Part No.:
- P4SMA12AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA12AH.pdf
- Description:
- TVS DIODE 10.2VWM 16.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,547
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Product details
Overview
P4SMA12AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, rated for 400W peak pulse power, 11.4–12.6V breakdown voltage at 1mA, and 16.7V clamping voltage at 25A peak impulse current. It protects DC/DC converters and automotive power supplies against ESD and ISO 7637-2 transients.
For engineers reviewing the P4SMA12AH datasheet, P4SMA12AH pinout, P4SMA12AH application, or P4SMA12AH equivalent, key selection criteria include its 10.2V working stand-off voltage, <1μA reverse leakage at VWM, AEC-Q101 qualification, and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive electronics robustness.
Technical Context
The P4SMA12AH employs a glass-passivated silicon junction to achieve fast transient response (<1.0ps), low capacitance, and stable clamping under repetitive surge conditions. Its unidirectional configuration provides forward conduction capability up to 3.5V at 25A and supports bidirectional use only when paired with complementary devices.
Designed for automotive-grade reliability, it operates across –55°C to +150°C junction temperature, meets JESD201 Class 2 whisker resistance, and features matte tin-plated leads compliant with J-STD-002 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR @ IT=1mA | 11.4–12.6V - ensures precise overvoltage triggering within automotive supply rails |
| VWM | 10.2V - maximum continuous reverse voltage before leakage exceeds 1μA |
| VC @ IPPM=25A | 16.7V - clamped voltage during 10/1000μs surge, limiting downstream stress |
| PPPM | 400W - peak pulse power handling per single non-repetitive event |
| IR @ VWM | <1μA - minimal standby power loss and signal integrity impact |
| TJ max | +150°C - enables operation in under-hood automotive environments |
| Package | DO-214AC (SMA) - industry-standard SMD footprint compatible with automated placement |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with cathode band marking; dual axial leads, 0.060g weight, UL 94V-0 rated compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path | Connects to protected circuit ground or low-side return; conducts during positive transients |
| Cathode | Clamping node | Connects to protected line (e.g., 12V rail); sinks surge current to ground when VIN exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including temperature cycling, HTRB, and ESD |
| Glass passivated junction | Enhances long-term stability and moisture resistance vs. epoxy-passivated alternatives |
| Fast response time <1.0ps | Clamps ESD events before IC input structures are damaged |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) |
| Moisture sensitivity level 1 | Zero bake requirement prior to reflow; supports standard SMT assembly without dry-pack handling |
Applications
| Automotive Infotainment Power Rail | Industrial SMPS Input Stage |
|---|---|
Use Scenario: Protects USB-C PD controller and display interface power inputs in head units exposed to load-dump transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 12V supply and local LDO input to clamp surges before regulation. Use Value: Limits clamped voltage to 16.7V, preventing damage to 20V-rated input capacitors and enabling reliable operation per ISO 7637-2 Pulse 1. | Use Scenario: Shields primary-side controller ICs in 48V-to-12V isolated DC/DC converters used in factory automation. IC Role / Device Role / Timing Role: Mounted across bulk capacitor terminals to absorb switching noise and line-induced spikes. Use Value: Delivers 400W peak pulse suppression with <1μA leakage, minimizing standby current while maintaining tight VWM margin over temperature. |
| LED Driver Module Protection | On-Board Charger (OBC) Auxiliary Supply |
Use Scenario: Safeguards constant-current LED driver ICs in commercial lighting systems subject to lightning-induced surges on 24V bus lines. IC Role / Device Role / Timing Role: Connected anode-to-ground, cathode-to-24V rail to suppress negative-going transients and clamp positive excursions. Use Value: Clamps at 16.7V with 25A peak current capacity, ensuring LED string drivers remain within safe operating area during 10/1000μs surges. | Use Scenario: Secures 12V auxiliary supply feeding MCU, CAN transceivers, and gate drivers in electric vehicle on-board chargers. IC Role / Device Role / Timing Role: Placed at OBC main board input to absorb battery line transients during contactor switching and regenerative braking events. Use Value: AEC-Q101 qualification and –55°C to +150°C operation ensure reliability across full EV thermal envelope and lifetime requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12A | 600W rating, DO-214AA (SMB) package, 12.2–13.5V VBR, 19.9V VC @ 30A | Higher power handling but larger footprint; less suitable for space-constrained automotive modules | Select SMBJ12A when system-level surge testing requires >400W margin or when existing layout accommodates SMB outline |
| 1.5SMC12A | 1500W rating, DO-214AB (SMC) package, 12.2–13.5V VBR, 19.9V VC @ 75A | Substantially higher surge capacity and thermal mass; not AEC-Q101 qualified | Choose 1.5SMC12A for industrial power supplies where automotive qualification is unnecessary and PCB space allows larger SMC footprint |
Compared with SMBJ12A and 1.5SMC12A, the P4SMA12AH offers optimal balance of AEC-Q101 compliance, DO-214AC compactness, and 400W protection for cost-sensitive automotive and industrial DC/DC nodes-without requiring PCB redesign or sacrificing qualification status.
Availability
P4SMA12AH is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial switching mode power supplies, and LED driver modules requiring stable component supply across extended temperature ranges and high-reliability production cycles.
Supply support for P4SMA12AH 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, MOSFETs, and power management components.
The P4SMA series belongs to TSC's AEC-Q101-qualified transient suppression portfolio, engineered specifically for automotive and industrial power rail protection where ISO 7637-2 compliance, low leakage, and surface-mount manufacturability are mandatory.
FAQ
What is the breakdown voltage range of the P4SMA12AH?
The P4SMA12AH has a specified breakdown voltage (VBR) range of 11.4V to 12.6V at a test current of 1.0mA, measured per ANSI/IEEE C62.35 standards. This tight tolerance ensures consistent clamping behavior across production lots and supports reliable overvoltage protection in 12V automotive and industrial systems where precise threshold control is critical. The P4SMA12AH maintains this specification across its full operating temperature range.
Is the P4SMA12AH suitable for bidirectional transient suppression?
No, the P4SMA12AH is a unidirectional TVS diode and is not rated for bidirectional operation. For bidirectional applications, Taiwan Semiconductor specifies parts with "CH" or "CAH" suffixes (e.g., P4SMA12CH). Using the P4SMA12AH in reverse-biased configurations beyond its specified VWM may result in premature failure. Always verify polarity alignment during PCB layout-cathode must connect to the protected line.
Does the P4SMA12AH meet automotive qualification standards?
Yes, the P4SMA12AH is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b transient immunity requirements. It also complies with JESD201 Class 2 whisker resistance, J-STD-020 moisture sensitivity level 1, and RoHS/halogen-free specifications per IEC 61249-2-21. These qualifications make the P4SMA12AH appropriate for under-hood and cabin-mounted automotive electronics.
What is the clamping voltage of the P4SMA12AH under surge conditions?
The P4SMA12AH exhibits a maximum clamping voltage (VC) of 16.7V at a peak impulse current (IPPM) of 25A using the 10/1000μs waveform. This value defines the upper voltage limit imposed on protected circuitry during standardized surge events and is guaranteed across the full operating temperature range. The low VC relative to VBR reflects efficient energy absorption and minimal voltage overshoot.
Can the P4SMA12AH be used in high-humidity environments?
Yes, the P4SMA12AH is designed for harsh environments: its glass-passivated chip junction and UL 94V-0 molding compound provide excellent moisture resistance, and its J-STD-020 Level 1 moisture sensitivity rating means it can be stored and processed without dry-packing or baking. These features enable reliable operation in high-humidity industrial enclosures and automotive under-hood locations where condensation and thermal cycling occur.
P4SMA12AH 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):
- 10.2V
- Voltage - Breakdown (Min):
- 11.4V
- Voltage - Clamping (Max) @ Ipp:
- 16.7V
- Current - Peak Pulse (10/1000µs):
- 25A
- 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)
P4SMA12AH FAQ
1.How can I place an order for P4SMA12AH through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA12AH 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 P4SMA12AH reliable?
The price and inventory of P4SMA12AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA12AH is usually 5 days.
3.What payment methods are accepted for P4SMA12AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA12AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA12AH?
P4SMA12AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA12AH 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 P4SMA12AH?
For technical support, including P4SMA12AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA12AH requirements.
6.How does Aetrix verify that P4SMA12AH is sourced from the original manufacturer or authorized distributors?
All P4SMA12AH 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 P4SMA12AH meets industry standards.
7.What is the process for return or replacement of P4SMA12AH?
All P4SMA12AH units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA12AH, 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 P4SMA12AH part is unused and in its original packaging.
Return procedure for P4SMA12AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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