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Taiwan Semiconductor Corporation P4SMA12CH
- Part No.:
- P4SMA12CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA12CH.pdf
- Description:
- 400W, 12V, 10%, BIDIRECTIONAL, T
- Quantity:
- Payment:
- Shipping:
Inventory:2,324
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Product details
Overview
P4SMA12CH from Taiwan Semiconductor is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode with a working stand-off voltage of 9.72 V, breakdown voltage range 10.8–13.2 V at 1 mA, and clamping voltage of 17.3 V at 24 A (10/1000 µs waveform). It is AEC-Q101 qualified and designed for automotive-grade surge protection in DC/DC converters and SMPS input stages.
For engineers reviewing the P4SMA12CH datasheet, P4SMA12CH pinout, P4SMA12CH application, or P4SMA12CH equivalent, key selection criteria include its DO-214AC (SMA) package, bidirectional capability (CH suffix), ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and low leakage (<1 µA at VWM).
Technical Context
The P4SMA12CH employs a glass-passivated silicon junction optimized for fast transient response (<1.0 ps) and stable clamping under repetitive surge events. Its unidirectional configuration features a cathode band marking and operates with a maximum junction temperature of 150°C.
Designed per ANSI/IEEE C62.35, it delivers 400 W peak pulse power (10/1000 µs), supports 40 A non-repetitive forward surge current (8.3 ms half-sine), and maintains <3.5 V forward voltage at 25 A - enabling robust overvoltage protection in compact automotive and industrial power rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 9.72 V - Maximum continuous reverse operating voltage before significant leakage begins |
| VBR min/max | 10.8–13.2 V @ 1 mA - Confirmed breakdown threshold range for reliable triggering |
| VC@IPPM | 17.3 V @ 24 A - Clamped voltage during 400 W surge, limiting downstream stress |
| IR@VWM | <1 µA - Ensures minimal standby power loss in high-impedance circuits |
| PPPM | 400 W - Peak pulse power handling per 10/1000 µs waveform, per Fig.5 |
| TJ max | 150 °C - Enables operation in under-hood automotive environments without derating |
| Package | DO-214AC (SMA) - Standardized SMT footprint compatible with automated placement |
Pinout & Package
DO-214AC (SMA) package: molded epoxy case with matte tin-plated leads, polarity indicated by cathode band; weight ≈ 0.060 g; meets UL 94V-0 and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side in unidirectional clamp configuration |
| Cathode (banded end) | Reverse-biased clamping terminal | Connected to protected line; conducts during overvoltage to shunt energy to ground |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics per stress test requirements (HTOL, TC, HAST, etc.) |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (board-level noise) |
| Glass passivated junction | Enhances long-term reliability and moisture resistance vs. epoxy-only passivation |
| Fast response time | <1.0 ps - Limits voltage overshoot during nanosecond-scale ESD or lightning-induced transients |
| Moisture sensitivity level 1 | No floor life limitation; safe for standard SMT reflow without baking |
Applications
| Automotive Infotainment Power Rail | Industrial SMPS Input Stage |
|---|---|
Use Scenario: Protecting USB-C PD controller supply lines in head units exposed to load-dump transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between 12 V rail and DC/DC input. Use Value: Limits transient voltage to ≤17.3 V during ISO 7637-2 Pulse 1 (−120 V/0.5 Ω), preventing controller latch-up. | Use Scenario: Safeguarding primary-side controller ICs in 24 V industrial switch-mode power supplies. IC Role / Device Role / Timing Role: Standoff protector on bulk capacitor input, triggered only above 9.72 V. Use Value: Absorbs 400 W surges without degradation, maintaining >1 µA leakage at nominal 24 V input. |
| LED Driver Board Protection | On-Board DC/DC Converter Input |
Use Scenario: Shielding constant-current LED driver ICs from switching noise in commercial lighting fixtures. IC Role / Device Role / Timing Role: Reverse-biased TVS across driver input pins to clamp inductive kickback. Use Value: Responds in <1 ps to suppress 100 V spikes, preserving driver MOSFET gate oxide integrity. | Use Scenario: Securing 5 V/3.3 V point-of-load regulators fed from 12 V vehicle battery via buck converter. IC Role / Device Role / Timing Role: Primary overvoltage clamp on buck converter input before filter inductor. Use Value: Maintains 9.72 V standoff while clamping to 17.3 V, ensuring regulator UVLO remains inactive during transients. |
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 | 600 W rating, SMA package, 12 V nominal VWM, but bidirectional version SMBJ12CA required for CH-equivalent function | Higher power margin; requires CA suffix for bidirectional use - not drop-in for P4SMA12CH's unidirectional layout | Select when system-level surge testing exceeds 400 W or dual-polarity transients dominate |
| 1.5SMC12AH | 1500 W rating, larger SMC package (DO-214AB), same VWM/VBR range, higher IPPM (122 A) | Requires PCB footprint change; suited for high-energy industrial surge zones, not space-constrained automotive modules | Choose for legacy designs using SMC footprints or where 1.5 kW pulse handling is mandated |
Compared with SMBJ12A and 1.5SMC12AH, the P4SMA12CH offers optimal balance of AEC-Q101 qualification, DO-214AC footprint compatibility, and 400 W surge capacity - making it preferred for new automotive infotainment and body-control module designs where board area and qualification rigor are critical.
Availability
P4SMA12CH is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial switch-mode power supplies, and LED lighting drivers requiring stable component supply with full traceability and lifecycle support.
Supply support for P4SMA12CH 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, and power devices since 1979.
The P4SMA series belongs to TSC's AEC-Q101-qualified transient suppression portfolio, engineered specifically for automotive and industrial power-line protection where reliability under ISO 7637-2 stress is mandatory.
FAQ
What does the "CH" suffix indicate in P4SMA12CH?
The "CH" suffix in P4SMA12CH denotes a unidirectional TVS diode with cathode-band polarity marking and compliance with AEC-Q101 stress testing. Unlike "CAH" variants, P4SMA12CH is not bidirectional - it clamps only in reverse bias. This matches the electrical specifications table entry for P4SMA12H (not P4SMA12AH), confirming its 10.8–13.2 V VBR range and 9.72 V VWM. The "H" indicates DO-214AC packaging.
Is P4SMA12CH compliant with ISO 7637-2, and which pulses does it cover?
Yes, P4SMA12CH meets ISO 7637-2 requirements for Pulses 1 (inductive load dump), 2a/2b (supply interruption and coupling), and 3a/3b (capacitive coupling and ignition noise). This is explicitly stated in the FEATURES section of the datasheet. Its 400 W peak power rating and 17.3 V clamping voltage at 24 A ensure effective suppression across all specified waveforms without thermal runaway.
What is the maximum junction temperature and thermal derating behavior of P4SMA12CH?
The P4SMA12CH has a maximum junction temperature (TJ) of 150°C and follows the derating curve in Figure 2 of the datasheet: power dissipation linearly decreases from 400 W at 25°C ambient to zero at 150°C. At 100°C ambient, rated peak pulse power drops to approximately 200 W. This enables reliable operation in engine bay or enclosed industrial enclosures without forced cooling.
Does P4SMA12CH require special PCB layout considerations for optimal performance?
Yes - minimize trace inductance between P4SMA12CH and protected node by placing it directly across the input terminals with shortest possible paths. Use wide, low-inductance ground connections and avoid vias in the clamping path. The DO-214AC (SMA) package's cathode band must align with circuit polarity; incorrect orientation disables protection. Thermal relief on pads is discouraged due to surge-current demands.
How does the glass passivation in P4SMA12CH improve long-term reliability compared to standard epoxy passivation?
Glass passivation in P4SMA12CH forms a hermetic, chemically inert barrier over the silicon junction, significantly reducing moisture ingress and ion migration under high humidity or thermal cycling. This extends operational life in automotive under-hood environments and improves resistance to bias-HAST failure modes - a key requirement for AEC-Q101 qualification that standard epoxy-only passivation cannot meet.
P4SMA12CH 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:
- -
- Bidirectional Channels:
- 1
- 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)
P4SMA12CH FAQ
1.How can I place an order for P4SMA12CH through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA12CH 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 P4SMA12CH reliable?
The price and inventory of P4SMA12CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA12CH is usually 5 days.
3.What payment methods are accepted for P4SMA12CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA12CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA12CH?
P4SMA12CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA12CH 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 P4SMA12CH?
For technical support, including P4SMA12CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA12CH requirements.
6.How does Aetrix verify that P4SMA12CH is sourced from the original manufacturer or authorized distributors?
All P4SMA12CH 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 P4SMA12CH meets industry standards.
7.What is the process for return or replacement of P4SMA12CH?
All P4SMA12CH units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA12CH, 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 P4SMA12CH part is unused and in its original packaging.
Return procedure for P4SMA12CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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