My Inquiry
My Account
Taiwan Semiconductor Corporation P4SMA27A
- Part No.:
- P4SMA27A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA27A.pdf
- Description:
- TVS DIODE 23.1VWM 37.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,913
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
P4SMA27A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for overvoltage protection in DC power rails. It features a 25.7–28.4 V breakdown voltage (VBR), 23.1 V working stand-off voltage (VWM), 37.5 V clamping voltage (VC) at 11.0 A peak pulse current, and 400 W peak pulse power rating per 10/1000 µs waveform - deployed in SMPS, on-board DC/DC converters, and lighting systems.
For engineers reviewing the P4SMA27A datasheet, P4SMA27A pinout, P4SMA27A application, or P4SMA27A equivalent, key selection criteria include its unidirectional polarity, 1 µA max reverse leakage at VWM, -55°C to +150°C operating junction temperature, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and UL 94V-0 mold compound - all critical for automotive and industrial power rail protection design.
Technical Context
The P4SMA27A operates as a unidirectional avalanche diode with glass-passivated junction, enabling fast response (<1.0 ps) and stable clamping under transient surges. Its single-die DO-214AC construction supports automated placement and meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity requirements.
Designed for non-repetitive surge suppression, it delivers 400 W peak pulse power at TA = 25°C, derating linearly above that ambient; maximum forward surge current is 40 A (8.3 ms half-sine), and forward voltage is ≤3.5 V at 25 A - confirming suitability for low-loss DC input stage protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR @ IT=1.0 mA | 25.7–28.4 V - defines minimum and maximum avalanche initiation threshold under standardized test current |
| VWM | 23.1 V - maximum continuous reverse voltage before significant leakage; sets safe operating DC rail margin |
| VC @ IPPM=11.0 A | 37.5 V - clamped voltage during 10/1000 µs surge; determines protected circuit's maximum transient exposure |
| IR @ VWM | ≤1 µA - ultra-low leakage ensures minimal standby power loss in battery-backed or high-impedance circuits |
| PPPM | 400 W - peak surge energy handling capacity per standard waveform; enables robustness against ISO 7637-2 pulses |
| TJ Range | -55°C to +150°C - wide junction temperature range supports under-hood automotive and industrial ambient conditions |
| Package | DO-214AC (SMA) - industry-standard surface-mount outline with cathode band marking and matte tin leads |
Pinout & Package
DO-214AC (SMA) package: molded epoxy case with axial lead configuration, cathode indicated by a band on the body; terminals are matte tin-plated for J-STD-002 solderability and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side of protected line; conducts during forward surge or bias |
| Cathode (banded end) | Reverse-biased clamping terminal | Connected to higher-potential rail; avalanches into conduction when reverse voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity stress |
| Fast response time <1.0 ps | Enables clamping before transient energy couples into downstream ICs or regulators |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validates suitability for 12 V/24 V automotive power networks including load dump and inductive switching events |
| UL 94V-0 flammability rating | Confirms flame-retardant molding compound for safety-critical power supply and lighting applications |
| RoHS & halogen-free | Meets IEC 61249-2-21 and environmental compliance requirements for global electronics manufacturing |
Applications
| Switching Mode Power Supply (SMPS) | On-board DC/DC Converter |
|---|---|
Use Scenario: Input rectifier/output rail protection against line transients and switching noise in AC/DC adapters and open-frame PSUs. IC Role / Device Role / Timing Role: Unidirectional TVS placed across bulk capacitor or post-rectifier output to clamp surges before they reach PWM controller or secondary-side regulation IC. Use Value: 37.5 V clamping voltage limits stress on 24 V-rated MOSFETs and controllers; 400 W rating handles repetitive 10/1000 µs surges without degradation. | Use Scenario: Protection of point-of-load (POL) converter inputs in telecom base stations and industrial PLCs exposed to board-level coupling and hot-swap events. IC Role / Device Role / Timing Role: Standoff-rated TVS on 12 V or 24 V input bus to absorb coupled ESD and inductive kickback from adjacent switching stages. Use Value: 23.1 V VWM provides 10% margin above nominal 21.6 V input, while 1 µA leakage avoids loading low-power enable or monitoring circuits. |
| Automotive Lighting Module | Industrial Adapter Interface |
Use Scenario: Overvoltage suppression on LED driver inputs subjected to load dump (ISO 7637-2 Pulse 5a) and jump-start transients. IC Role / Device Role / Timing Role: Primary front-end TVS on 12 V supply line upstream of buck controller and gate drivers. Use Value: 150°C max junction temperature and ISO 7637-2 certification ensure operation in under-hood environments; DO-214AC footprint allows compact layout near connector entry. | Use Scenario: Surge protection on universal-input AC/DC adapter outputs feeding sensitive IoT gateways or sensor hubs. IC Role / Device Role / Timing Role: Final-stage TVS on regulated 5 V/12 V output to prevent damage from back-fed transients or miswired inputs. Use Value: 37.5 V clamping guarantees downstream 5 V logic remains below absolute maximum ratings even during worst-case 10/1000 µs events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24A (Bourns) | DO-214AA (SMB) package; 24 V VWM, 38.9 V VC @ 10.3 A; same 400 W rating | Larger footprint than DO-214AC; slightly lower clamping but higher leakage (5 µA @ VWM) | Select when board space permits larger SMB package and higher leakage is acceptable |
| 1.5SMC27A (ON Semiconductor) | DO-214AB (SMC) package; 27 V VWM, 43.0 V VC @ 9.3 A; 1500 W rating | Higher clamping voltage and 3.75× peak power; not drop-in due to larger SMC outline and different thermal mass | Choose only when higher surge energy handling is required and PCB layout accommodates SMC footprint |
Compared with P4SMA27A, SMBJ24A offers comparable clamping performance in a larger package with higher leakage, while 1.5SMC27A provides significantly higher surge capacity but requires redesign due to SMC footprint and elevated VC - making P4SMA27A optimal for space-constrained, low-leakage 24 V rail protection.
Availability
P4SMA27A is available at Aetrix Electronics and suitable for switching mode power supplies, on-board DC/DC converters, and automotive lighting modules requiring stable component supply, RoHS-compliant packaging, and ISO 7637-2 certified transient immunity.
Supply support for P4SMA27A 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 Company (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for industrial, automotive, and consumer markets.
The P4SMA series belongs to TSC's surface-mount TVS portfolio engineered specifically for high-reliability DC rail protection - balancing low clamping voltage, fast response, and automotive-grade qualification in compact DO-214AC packages.
FAQ
What is the polarity configuration of the P4SMA27A?
The P4SMA27A is a unidirectional TVS diode, with cathode identified by a band on the DO-214AC package body. It conducts in forward bias like a standard diode and clamps in reverse bias once VBR is exceeded. This configuration is intended for DC line protection where polarity is fixed, unlike bidirectional variants (e.g., P4SMA27CA) used in AC or floating signal paths. The P4SMA27A datasheet confirms unidirectional operation and specifies forward voltage ≤3.5 V at 25 A.
Does the P4SMA27A meet automotive transient standards?
Yes, the P4SMA27A meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements for 12 V automotive electrical systems. Its 400 W peak pulse power rating, 37.5 V clamping voltage at 11.0 A, and -55°C to +150°C operating junction temperature range are validated for load dump, supply interruption, and inductive switching events. Taiwan Semiconductor's official documentation explicitly lists ISO 7637-2 compliance for the P4SMA27A and full P4SMA family.
What is the maximum reverse leakage current for the P4SMA27A at its working voltage?
The P4SMA27A has a maximum reverse leakage current (IR) of 1 µA when biased at its rated working stand-off voltage (VWM) of 23.1 V. This ultra-low leakage is specified at TA = 25°C and ensures minimal power loss in always-on or battery-powered circuits. The value is confirmed in the Electrical Specifications table of the P4SMA27A datasheet and applies to both standard and A-suffix variants across the P4SMA series.
Can the P4SMA27A be used in bidirectional signal line protection?
No, the P4SMA27A is strictly unidirectional and unsuitable for bidirectional signal line protection. Its asymmetrical I-V curve clamps only in reverse bias and conducts fully in forward bias - risking short-circuit or distortion on AC or dual-polarity lines. For bidirectional applications, engineers must select CA-suffix variants such as P4SMA27CA, which feature symmetrical breakdown in both directions and are explicitly designated for data line or AC rail protection per the P4SMA family datasheet.
What is the thermal derating behavior of the P4SMA27A above 25°C ambient?
The P4SMA27A exhibits linear thermal derating of its 400 W peak pulse power rating above TA = 25°C, as defined in Figure 2 of the official datasheet. At 85°C ambient, its rated PPPM drops to approximately 260 W; at 125°C, it falls to ~140 W. This derating follows the device's junction-to-ambient thermal resistance and ensures safe operation within its 150°C maximum junction temperature limit. Designers must apply this curve when sizing for high-temperature environments like engine compartments or enclosed power supplies.
P4SMA27A 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):
- 23.1V
- Voltage - Breakdown (Min):
- 25.7V
- Voltage - Clamping (Max) @ Ipp:
- 37.5V
- Current - Peak Pulse (10/1000µs):
- 11A
- 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)
P4SMA27A FAQ
1.How can I place an order for P4SMA27A through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA27A 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 P4SMA27A reliable?
The price and inventory of P4SMA27A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA27A is usually 5 days.
3.What payment methods are accepted for P4SMA27A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA27A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA27A?
P4SMA27A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA27A 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 P4SMA27A?
For technical support, including P4SMA27A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA27A requirements.
6.How does Aetrix verify that P4SMA27A is sourced from the original manufacturer or authorized distributors?
All P4SMA27A 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 P4SMA27A meets industry standards.
7.What is the process for return or replacement of P4SMA27A?
All P4SMA27A units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA27A, 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 P4SMA27A part is unused and in its original packaging.
Return procedure for P4SMA27A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMA27A 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
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 …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
