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Taiwan Semiconductor Corporation P4SMA27CAH
- Part No.:
- P4SMA27CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA27CAH.pdf
- Description:
- TVS DIODE 23.1VWM 37.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,256
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Product details
Overview
P4SMA27CAH from Taiwan Semiconductor is a bidirectional 400W surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, with breakdown voltage 25.7–28.4 V at 1 mA test current, working stand-off voltage 23.1 V, clamping voltage 37.5 V at 11.0 A peak pulse current, and AEC-Q101 qualification for automotive-grade surge protection in DC/DC converters.
For engineers reviewing the P4SMA27CAH datasheet, P4SMA27CAH pinout, P4SMA27CAH application, or P4SMA27CAH equivalent, this page delivers verified electrical specs, bidirectional TVS behavior, ISO 7637-2 compliance, thermal derating curves, and direct alternatives for automotive power rail protection design.
Technical Context
The P4SMA27CAH is a glass-passivated, bipolar junction TVS diode designed for unidirectional or bidirectional transient suppression. Its symmetrical clamping response ensures identical VC and VBR in both polarities, meeting ISO 7637-2 Pulse 1/2a/2b/3a/3b waveforms without polarity-dependent design constraints.
It operates across –55 °C to +150 °C junction temperature range with <1 μA reverse leakage at 23.1 V, fast sub-1 ps response time, and 0.096 %/°C temperature coefficient of breakdown voltage - enabling stable clamping performance under thermal stress in engine control units and ADAS power supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR @ IT = 1 mA | 25.7–28.4 V: Ensures reliable turn-on before system overvoltage damage in 24 V automotive rails |
| VWM | 23.1 V: Maximum continuous reverse voltage without significant leakage - compatible with 24 V nominal systems |
| VC @ IPPM = 11.0 A | 37.5 V: Clamped voltage during 10/1000 μs surge - keeps downstream ICs below absolute max ratings |
| PPPM | 400 W: Peak pulse power handling per single transient - meets ISO 7637-2 Pulse 5a requirements |
| IR @ VWM | <1 μA: Negligible standby power loss and minimal impact on high-impedance sensing circuits |
| TJ Range | –55 to +150 °C: Supports under-hood placement in automotive ECUs without thermal derating penalties |
| Package | DO-214AC (SMA): Standardized SMT footprint compatible with automated assembly and IPC-7351B land patterns |
Pinout & Package
DO-214AC (SMA) surface-mount package with cathode band marking; bidirectional configuration means both terminals are electrically symmetric - no anode/cathode distinction required in circuit layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Transient input/output node | Connected across protected line and ground (or between differential lines); bidirectional conduction enables clamp in either polarity |
| Terminal 2 | Transient input/output node | Electrically identical to Terminal 1; polarity marking not functional for P4SMA27CAH - device operates identically regardless of orientation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and infotainment power rails |
| Glass passivated junction | Enhances long-term reliability and moisture resistance versus epoxy-passivated alternatives |
| ISO 7637-2 compliance | Guarantees robustness against load dump, jump start, and alternator ripple transients in 12/24 V systems |
| Moisture sensitivity level 1 | Enables standard SMT reflow without baking - reduces manufacturing overhead and BOM complexity |
| Halogen-free & RoHS compliant | Meets EU Directive 2011/65/EU and IEC 61249-2-21 for environmentally constrained designs |
Applications
| Automotive Engine Control Unit (ECU) | On-board DC/DC Converter |
|---|---|
Use Scenario: Protecting microcontroller power inputs and CAN transceiver lines from load dump and alternator-induced surges in gasoline/diesel engine compartments. IC Role / Device Role / Timing Role: Bidirectional TVS clamping element placed at 24 V input filter stage and signal line interfaces. Use Value: Maintains VC ≤ 37.5 V during 400 W transients, preventing latch-up or permanent damage to 3.3 V/5 V logic and CAN PHYs rated to 40 V abs max. | Use Scenario: Safeguarding primary-side MOSFET gate drivers and secondary-side feedback optocouplers in isolated 24 V-to-5 V/3.3 V buck-boost converters. IC Role / Device Role / Timing Role: Transient shunt across input bulk capacitor and across output sense resistors. Use Value: Sub-1 ps response ensures clamping initiates before 100 ns rise-time spikes propagate into regulation loop, preserving stability and output accuracy. |
| LED Headlamp Driver Module | Industrial 24 V PLC I/O Card |
Use Scenario: Suppressing switching noise and ESD events generated by PWM dimming circuits and relay coil back-EMF in adaptive front-lighting systems. IC Role / Device Role / Timing Role: Parallel-connected TVS at LED string supply rail and microcontroller GPIO lines. Use Value: 23.1 V VWM allows uninterrupted operation during normal 24 V ±10% variation while clamping >30 V transients to safe levels for 40 V-rated LED drivers. | Use Scenario: Shielding digital input channels and RS-485 transceivers from field-wiring induced surges in factory automation cabinets. IC Role / Device Role / Timing Role: Line-to-ground and line-to-line TVS protection on 24 V sensor supply and communication bus lines. Use Value: Bidirectional symmetry eliminates need for orientation-aware layout - simplifies PCB routing and reduces assembly errors in high-volume industrial backplanes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24CA | 600 W rating, SMB package (larger footprint), VBR = 26.7–29.5 V, VC = 38.9 V @ 15.4 A | Higher power handling but requires larger board area; less suitable for space-constrained automotive modules | Select when surge energy exceeds 400 W or when legacy SMB layout exists |
| 1.5KE27CA | Through-hole TO-204AA (DO-41), 1500 W rating, VBR = 25.7–28.4 V, VC = 41.5 V @ 36.2 A | Not SMT-compatible; incompatible with automated assembly; higher clamping voltage reduces margin for low-voltage ICs | Use only for prototyping or non-automated repair scenarios where SMT is unavailable |
Compared with SMBJ24CA and 1.5KE27CA, the P4SMA27CAH offers optimal balance of AEC-Q101 compliance, DO-214AC footprint efficiency, and precise 23.1 V stand-off for 24 V automotive systems - making it the preferred choice for production-grade SMT power rail protection.
Availability
P4SMA27CAH is available at Aetrix Electronics and suitable for automotive engine control units, on-board DC/DC converters, and industrial 24 V PLC I/O cards requiring stable component supply with full traceability and lifecycle management.
Supply support for P4SMA27CAH 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 with global distribution and AEC-Q101 validation capability.
The P4SMA series targets automotive and industrial transient suppression, engineered specifically for ISO 7637-2 compliance, high-reliability SMT deployment, and extended temperature operation in harsh environments.
FAQ
What does the "CAH" suffix indicate in P4SMA27CAH?
The "CAH" suffix denotes a bidirectional configuration with A-grade tolerance (tighter VBR spread: 25.7–28.4 V vs. H-grade 24.3–29.7 V) and halogen-free construction. Unlike unidirectional "H" variants, P4SMA27CAH provides symmetrical clamping in both polarities - critical for protecting differential buses or AC-coupled signals without polarity concerns.
Is P4SMA27CAH suitable for 24 V automotive power rail protection?
Yes, P4SMA27CAH is explicitly designed for 24 V systems: its 23.1 V working stand-off voltage accommodates normal 24 V ±10% variation, while its 37.5 V clamping voltage protects downstream 40 V-rated ICs during ISO 7637-2 Pulse 5a load dump events. AEC-Q101 qualification further confirms suitability for under-hood automotive use.
How does P4SMA27CAH compare to unidirectional P4SMA27AH?
P4SMA27CAH differs from P4SMA27AH in polarity behavior: P4SMA27CAH clamps equally in both directions (bidirectional), whereas P4SMA27AH conducts only in reverse bias. Both share identical VBR, VWM, and VC values, but P4SMA27CAH eliminates orientation dependency in layout - reducing assembly risk and simplifying protection of bidirectional interfaces like LIN or SENT.
Does P4SMA27CAH require special PCB layout considerations?
No special layout is needed beyond standard DO-214AC (SMA) practices: use IPC-7351B-compliant pads, minimize trace inductance to the protected node, and avoid thermal relief on high-current paths. Because P4SMA27CAH is bidirectional, orientation on board is irrelevant - unlike unidirectional TVS diodes that require correct cathode alignment.
What is the maximum operating temperature for P4SMA27CAH?
P4SMA27CAH has a specified junction temperature range of –55 °C to +150 °C. At ambient temperatures above 25 °C, peak pulse power must be derated per Figure 2 in the datasheet - e.g., at 85 °C ambient, maximum PPPM drops to ~280 W. This enables reliable operation in engine bay environments when thermally coupled to copper pour or heatsink areas.
P4SMA27CAH 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):
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
P4SMA27CAH FAQ
1.How can I place an order for P4SMA27CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA27CAH 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 P4SMA27CAH reliable?
The price and inventory of P4SMA27CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA27CAH is usually 5 days.
3.What payment methods are accepted for P4SMA27CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA27CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA27CAH?
P4SMA27CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA27CAH 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 P4SMA27CAH?
For technical support, including P4SMA27CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA27CAH requirements.
6.How does Aetrix verify that P4SMA27CAH is sourced from the original manufacturer or authorized distributors?
All P4SMA27CAH 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 P4SMA27CAH meets industry standards.
7.What is the process for return or replacement of P4SMA27CAH?
All P4SMA27CAH units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA27CAH, 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 P4SMA27CAH part is unused and in its original packaging.
Return procedure for P4SMA27CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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