My Inquiry
My Account
Taiwan Semiconductor Corporation P4SMA12A
- Part No.:
- P4SMA12A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA12A.pdf
- Description:
- TVS DIODE 10.2VWM 16.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,128
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
P4SMA12A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 11.4–12.6 V breakdown voltage (VBR), 10.2 V working stand-off voltage (VWM), 16.7 V clamping voltage (VC) at 25 A, 400 W peak pulse power (10/1000 µs), and operates across –55 °C to +150 °C junction temperature range - deployed in SMPS input stages and DC/DC converter inputs.
For engineers reviewing the P4SMA12A datasheet, P4SMA12A pinout, P4SMA12A application, or P4SMA12A equivalent, key selection criteria include clamping performance under 25 A surge, low leakage (<1 µA at 10.2 V), DO-214AC (SMA) package compatibility with automated SMT lines, and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive electronics protection.
Technical Context
The P4SMA12A implements a single-die, unidirectional avalanche junction structure with glass passivated chip construction, enabling fast response time (<1.0 ps) and stable clamping under repetitive transients. Its DO-214AC (SMA) package supports high thermal dissipation and meets UL 94V-0 flammability rating.
Designed for primary-side surge suppression in low-to-medium power converters, it sustains 40 A non-repetitive forward surge current (8.3 ms half-sine) and maintains <3.5 V forward voltage at 25 A - critical for minimizing conduction loss during fault conditions while preserving system-level ESD and load-dump immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR @ IT=1.0 mA | 11.4–12.6 V - defines precise avalanche initiation threshold for reliable overvoltage triggering |
| VWM | 10.2 V - maximum continuous reverse operating voltage before leakage rises above 1 µA |
| VC @ IPPM=25 A | 16.7 V - clamped voltage during 10/1000 µs surge, limiting downstream IC stress |
| PPPM | 400 W - peak pulse power handling capability per standard 10/1000 µs waveform |
| IR @ VWM | <1 µA - ensures negligible standby power loss and signal integrity in high-impedance circuits |
| TJ Range | –55 °C to +150 °C - supports operation in under-hood automotive, industrial power, and enclosed LED driver environments |
| Package | DO-214AC (SMA) - industry-standard SMT footprint compatible with J-STD-002 soldering and JESD201 Class 2 whisker resistance |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, cathode band marking polarity, 0.060 g weight, and UL 94V-0 rated compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path | Connected to protected circuit ground or low-side rail; conducts during reverse-biased transient clamp |
| Cathode | Protected line connection | Connected to line being safeguarded (e.g., +12 V rail); blocks normal operation, avalanches during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure |
| Clamping ratio (VC/VBR) | 1.32–1.47 - low ratio minimizes voltage overshoot during fast transients, protecting 12 V logic and analog ICs |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) - suitable for automotive ECUs |
| Moisture sensitivity level | MSL Level 1 (per J-STD-020) - no bake requirement prior to reflow, simplifying manufacturing flow |
Applications
| Switching Mode Power Supply (SMPS) | On-board DC/DC Converter |
|---|---|
Use Scenario: Input stage protection against line surges and inductive kickback in 12 V input AC/DC adapters and offline SMPS. IC Role / Device Role / Timing Role: Unidirectional TVS placed between rectified input and bulk capacitor to clamp transients before they reach PWM controller and MOSFETs. Use Value: Limits peak voltage to ≤16.7 V during 400 W surges, preventing gate oxide damage and ensuring >100,000-cycle reliability under repeated ISO 7637-2 Pulse 1 stress. | Use Scenario: Protection of point-of-load (POL) converters in telecom base stations and industrial PLCs exposed to board-level ESD and supply ripple. IC Role / Device Role / Timing Role: TVS mounted directly at DC/DC input pins to suppress fast-rising transients induced by adjacent switching regulators or relay coils. Use Value: Sub-1 ps response time ensures clamping activation before sensitive buck controller ICs experience overvoltage beyond absolute maximum ratings. |
| Automotive Body Control Module (BCM) | LED Driver Power Input |
Use Scenario: Load-dump and jump-start surge suppression on 12 V battery-fed microcontroller power rails in BCMs. IC Role / Device Role / Timing Role: Primary protection device on main VBAT input, coordinated with upstream fuses and secondary RC filters. Use Value: Withstands 40 A 8.3 ms surge without degradation and maintains <1 µA leakage at 10.2 V - preserving sleep-mode current budget. | Use Scenario: Overvoltage safeguard for constant-current LED drivers powered from 12 V vehicle or building wiring subject to cable-induced spikes. IC Role / Device Role / Timing Role: Placed between input connector and driver IC's VIN pin to absorb energy from hot-plug events and inductive cable disconnection. Use Value: 16.7 V clamping ensures LED string and driver IC remain within safe operating area even during 100 V/10 ms transients per ISO 16750-2. |
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 (Bourns) | Same DO-214AA (SMB) package; 12 V nominal VBR, 19.9 V VC @ 21.1 A; 600 W PPPM | Higher clamping voltage and larger footprint - requires PCB layout change | Select when higher surge margin is needed and SMB pad layout is available |
| 1.5SMC12A (ON Semiconductor) | DO-214AB (SMC) package; 12 V nominal VBR, 19.9 V VC @ 21.1 A; 1500 W PPPM | 3× larger package and 3.7× higher power rating - overqualified for 400 W use cases | Choose only if legacy SMC footprint exists and future-proofing against extreme transients is required |
Compared with SMBJ12A and 1.5SMC12A, the P4SMA12A delivers optimal balance of compact DO-214AC (SMA) size, precise 16.7 V clamping, and verified ISO 7637-2 compliance - making it preferred for space-constrained 12 V automotive and industrial power modules where layout efficiency and predictable clamping are critical.
Availability
P4SMA12A is available at Aetrix Electronics and suitable for switching mode power supplies, on-board DC/DC converters, and automotive body control modules requiring stable component supply and full traceability.
Supply support for P4SMA12A 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, rectifiers, and MOSFETs - headquartered in Hsinchu, Taiwan, with global distribution and AEC-Q200 qualified product lines.
The P4SMA12A belongs to TSC's P4SMAx series of surface-mount TVS diodes engineered specifically for cost-sensitive, high-volume automotive and industrial power protection - emphasizing MSL Level 1 manufacturability, ISO 7637-2 compliance, and tight VBR tolerances.
FAQ
What is the maximum clamping voltage of the P4SMA12A under a 25 A transient?
The P4SMA12A has a maximum clamping voltage (VC) of 16.7 V when subjected to a 10/1000 µs surge current of 25 A. This value is measured per ANSI/IEEE C62.35 standards and ensures downstream 12 V-rated components remain within safe operating limits during transient events. The P4SMA12A achieves this with a low clamping ratio of ~1.38 relative to its VBR midpoint (12.0 V), confirming effective overvoltage suppression.
Is the P4SMA12A suitable for bidirectional transient protection?
No, the P4SMA12A is a unidirectional TVS diode intended for DC line protection with defined anode-cathode polarity. For bidirectional applications such as AC signal lines or differential buses, the P4SMA12CA variant (with 'CA' suffix) must be used instead. The P4SMA12A's electrical characteristics apply only in reverse-bias avalanche mode; forward conduction follows standard silicon diode behavior with VF ≤ 3.5 V at 25 A.
Does the P4SMA12A meet automotive-grade reliability standards?
Yes, the P4SMA12A meets ISO 7637-2 requirements for Pulse 1, 2a, 2b, 3a, and 3b waveforms - essential for automotive electronic control units. It is also rated for operation from –55 °C to +150 °C junction temperature and classified as MSL Level 1 per J-STD-020, supporting lead-free reflow without moisture-related defects. While not AEC-Q200 certified as a standalone part, it is widely used in AEC-Q200-compliant systems when validated in end-application testing.
What is the leakage current specification for the P4SMA12A at its working voltage?
The P4SMA12A exhibits a maximum reverse leakage current (IR) of 1 µA when biased at its working stand-off voltage (VWM) of 10.2 V. This ultra-low leakage ensures minimal power loss in always-on circuits and preserves signal integrity in high-impedance sensing nodes. Measured at 25 °C and confirmed across production lots, this parameter supports energy-efficient designs such as battery-backed automotive modules and IoT edge sensors.
Can the P4SMA12A be used in place of the P4SMA12 without design changes?
Yes, the P4SMA12A is the tighter-tolerance variant of the P4SMA12, with VBR specified as 11.4–12.6 V (vs. 10.8–13.2 V for P4SMA12) and identical DO-214AC (SMA) package, pinout, and thermal characteristics. No PCB or schematic changes are required for substitution; the P4SMA12A offers improved consistency in clamping behavior and lower VBR variation - beneficial for designs demanding precise overvoltage thresholds.
P4SMA12A 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
P4SMA12A FAQ
1.How can I place an order for P4SMA12A through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA12A 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 P4SMA12A reliable?
The price and inventory of P4SMA12A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA12A is usually 5 days.
3.What payment methods are accepted for P4SMA12A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA12A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA12A?
P4SMA12A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA12A 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 P4SMA12A?
For technical support, including P4SMA12A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA12A requirements.
6.How does Aetrix verify that P4SMA12A is sourced from the original manufacturer or authorized distributors?
All P4SMA12A 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 P4SMA12A meets industry standards.
7.What is the process for return or replacement of P4SMA12A?
All P4SMA12A units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA12A, 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 P4SMA12A part is unused and in its original packaging.
Return procedure for P4SMA12A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMA12A 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 …
