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Taiwan Semiconductor Corporation P4SMA27
- Part No.:
- P4SMA27
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA27.pdf
- Description:
- 400W, 27V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:5,208
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Product details
Overview
P4SMA27 from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for overvoltage protection in DC power lines and signal paths. It features a 24.3–29.7 V breakdown voltage (VBR), 21.8 V working stand-off voltage (VWM), 39.1 V maximum clamping voltage (VC) at 10.7 A peak pulse current, and 400 W peak pulse power rating under 10/1000 µs waveform - deployed in SMPS input stages and on-board DC/DC converters.
For engineers reviewing the P4SMA27 datasheet, P4SMA27 pinout, P4SMA27 application, or P4SMA27 equivalent, key selection criteria include its DO-214AC (SMA) package compatibility with automated placement, sub-1 ps response time, <1 µA reverse leakage at VWM, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and junction temperature range of –55°C to +150°C.
Technical Context
The P4SMA27 operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its specified VBR range (24.3–29.7 V @ 1.0 mA). Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1 µA at 21.8 V), while the DO-214AC package supports high thermal dissipation during transient events.
It delivers 400 W peak pulse power (10/1000 µs) with a clamping ratio (VC/VBR(min)) of ~1.61 and a temperature coefficient of VBR at 0.096 %/°C - enabling predictable performance across automotive and industrial ambient temperature ranges (–55°C to +150°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR @ IT | 24.3–29.7 V at 1.0 mA test current - defines reliable avalanche initiation threshold for overvoltage detection |
| VWM | 21.8 V - maximum continuous reverse operating voltage before leakage rises significantly |
| VC @ IPPM | 39.1 V at 10.7 A (10/1000 µs) - limits downstream voltage stress during surge events |
| PPPM | 400 W - peak transient energy absorption capability without failure |
| IR @ VWM | <1 µA - ensures minimal standby power loss and signal integrity in high-impedance circuits |
| Junction Temp Range | –55°C to +150°C - supports operation in under-hood automotive and industrial power supply environments |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, single-diode configuration with cathode band marking. Matte tin-plated leads meet J-STD-002 solderability; moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional TVS configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., +12 V rail); conducts during overvoltage to shunt current to ground |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity |
| Response time <1.0 ps | Clamps transients before sensitive downstream ICs experience damaging voltage overshoot |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validated for automotive load-dump and inductive-switching surge immunity |
| UL 94V-0 molding compound | Meets flammability safety requirements for enclosed power electronics enclosures |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and environmental directives for global manufacturing |
Applications
| Switching Mode Power Supply (SMPS) Input Protection | On-Board DC/DC Converter Input Stage |
|---|---|
Use Scenario: Protects primary-side rectifier output and controller ICs against line-induced surges and inductive kickback in AC/DC adapters and telecom PSUs. IC Role / Device Role: Unidirectional TVS placed between rectified DC bus and ground, clamping positive transients only. Use Value: Limits peak voltage to ≤39.1 V during 400 W transients, preventing damage to 36 V-rated MOSFETs and PWM controllers. |
Use Scenario: Shields 5 V or 12 V point-of-load (POL) DC/DC modules from board-level ESD and coupling noise in motor drives and PLCs. IC Role / Device Role: Standoff voltage (21.8 V) safely isolates normal operation; clamps fast-rising spikes on input rails before regulator input capacitors. Use Value: Sub-1 ps response ensures clamping occurs within first nanosecond of surge onset, preserving regulator stability and output regulation. |
| Automotive Body Control Module (BCM) Power Rail | Industrial Lighting Driver Input Stage |
Use Scenario: Installed on 12 V battery-fed power inputs of BCMs to withstand load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role: Unidirectional suppression aligned with vehicle ground-referenced architecture; cathode tied to protected 12 V rail. Use Value: 150°C max junction temperature and –55°C cold-start rating ensure functionality across full automotive ambient range. |
Use Scenario: Safeguards LED driver ICs in streetlight and high-bay fixtures exposed to lightning-induced surges on AC mains-derived DC buses. IC Role / Device Role: Mounted across bulk capacitor input to absorb repetitive 10/1000 µs transients from nearby switching loads or grid disturbances. Use Value: 400 W rating and low clamping voltage (39.1 V) prevent overvoltage shutdown of constant-current LED controllers rated for ≤42 V input. |
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) | Bidirectional; VBR = 26.7–29.5 V; VC = 38.9 V @ 10.3 A; same DO-214AA (SMB) package | Supports AC-coupled or floating-line protection where polarity reversal may occur | Select if bidirectional clamping is required; not drop-in due to different package footprint and polarity behavior |
| 1.5SMC27A (ON Semiconductor) | Same unidirectional function; VBR = 25.7–28.4 V; VC = 40.5 V @ 9.9 A; DO-214AB (SMC) package, larger than SMA | Higher surge margin (1500 W) but requires PCB layout change for larger SMC pad geometry | Choose for higher-energy transients; not pin-compatible - requires redesign of land pattern and assembly process |
Compared with SMBJ24A and 1.5SMC27A, the P4SMA27 offers optimal balance of compact DO-214AC footprint, precise 21.8 V standoff, and 39.1 V clamping for space-constrained 12–24 V DC systems where unidirectional protection suffices and layout reuse is critical.
Availability
P4SMA27 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, consistent parametric performance, and RoHS-compliant sourcing.
Supply support for P4SMA27 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 for industrial, automotive, and consumer applications.
The P4SMA27 belongs to TSC's P4SMA series of 400 W surface-mount TVS diodes, engineered for high-reliability transient suppression in cost-sensitive, high-volume power conversion and automotive electronics.
FAQ
What is the polarity configuration of the P4SMA27?
The P4SMA27 is a unidirectional TVS diode, with cathode marked by a band on the DO-214AC package. It conducts only during reverse overvoltage events - i.e., when the cathode voltage exceeds anode voltage by ≥24.3 V - making it suitable for ground-referenced DC rail protection. The P4SMA27 does not conduct during forward bias except at typical VF ≈ 3.5 V under 25 A surge, per absolute maximum ratings.
Does the P4SMA27 meet automotive surge standards?
Yes, the P4SMA27 meets ISO 7637-2 Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) requirements. Its 400 W peak pulse power, 39.1 V clamping voltage, and –55°C to +150°C operating range make it suitable for front-end protection in automotive ECUs and body control modules, though it is not rated for load dump (Pulse 5a) alone without additional staging.
What is the maximum clamping voltage of the P4SMA27 under standard test conditions?
The maximum clamping voltage of the P4SMA27 is 39.1 V, measured at 10.7 A peak pulse current using the standardized 10/1000 µs double-exponential waveform. This value represents the upper limit of voltage seen by downstream circuitry during a worst-case transient event, ensuring compatibility with 36 V-rated components in 24 V systems.
Can the P4SMA27 be used in bidirectional signal line protection?
No - the P4SMA27 is strictly unidirectional and lacks symmetrical breakdown in both polarities. For bidirectional protection (e.g., RS-485, CAN, or AC lines), use the P4SMA27A variant or dedicated bidirectional parts like SMBJ24A. Using P4SMA27 on floating or AC-coupled signals risks forward conduction during negative half-cycles and inadequate clamping during reverse surges.
What is the thermal derating behavior of the P4SMA27 above 25°C ambient?
The P4SMA27's peak pulse power rating derates linearly above 25°C ambient per Figure 2 in the datasheet: at 85°C, it retains ~70% of its 400 W rating (~280 W); at 125°C, ~40% (~160 W). This derating must be applied when sizing for repeated surges in high-temperature enclosures, such as under-hood automotive or sealed industrial power supplies.
P4SMA27 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):
- 21.8V
- Voltage - Breakdown (Min):
- 24.3V
- Voltage - Clamping (Max) @ Ipp:
- 39.1V
- Current - Peak Pulse (10/1000µs):
- 10.7A
- 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)
P4SMA27 FAQ
1.How can I place an order for P4SMA27 through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA27 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 P4SMA27 reliable?
The price and inventory of P4SMA27 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA27 is usually 5 days.
3.What payment methods are accepted for P4SMA27?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA27 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA27?
P4SMA27 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA27 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 P4SMA27?
For technical support, including P4SMA27 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA27 requirements.
6.How does Aetrix verify that P4SMA27 is sourced from the original manufacturer or authorized distributors?
All P4SMA27 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 P4SMA27 meets industry standards.
7.What is the process for return or replacement of P4SMA27?
All P4SMA27 units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA27, 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 P4SMA27 part is unused and in its original packaging.
Return procedure for P4SMA27:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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