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Taiwan Semiconductor Corporation P4SMA20CAH
- Part No.:
- P4SMA20CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA20CAH.pdf
- Description:
- TVS DIODE 17.1VWM 27.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,037
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Product details
Overview
P4SMA20CAH from Taiwan Semiconductor is a bidirectional 400W surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, with 20V working stand-off voltage (VWM), 21.0V minimum breakdown voltage (VBR), and 27.7V maximum clamping voltage (VC) at 15A peak pulse current. It delivers AEC-Q101 qualification and ISO 7637-2 compliance for automotive power line surge protection.
For engineers reviewing the P4SMA20CAH datasheet, P4SMA20CAH pinout, P4SMA20CAH application, or P4SMA20CAH equivalent, key selection criteria include bidirectional clamping performance under 10/1000μs transients, junction temperature range (–55°C to +150°C), moisture sensitivity level 1 handling, and compatibility with automated SMT placement in DC/DC converters and lighting systems.
Technical Context
The P4SMA20CAH uses a glass-passivated silicon junction optimized for fast transient response (<1.0 ps) and low leakage (<1 μA at VWM). Its bidirectional configuration enables symmetrical clamping in AC-coupled or floating signal/power lines without polarity concerns.
Designed for automotive-grade reliability, it meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b waveforms and supports operation across –55°C to +150°C junction temperature, with thermal derating above 25°C ambient per published curve.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 17.1 V - Maximum continuous reverse voltage before significant leakage; defines safe operating margin below breakdown |
| VBR (min) | 19.0 V @ 1.0 mA - Guaranteed minimum breakdown threshold ensures predictable turn-on during surges |
| VC @ IPPM | 27.7 V @ 15.0 A - Clamped voltage during 10/1000μs surge limits downstream component stress |
| PPPM | 400 W - Peak pulse power rating determines survivability of standardized automotive transients |
| IR @ VWM | <1 μA - Ultra-low leakage preserves efficiency in high-impedance bias or sensing circuits |
| TJ Range | –55°C to +150°C - Enables deployment in under-hood automotive environments and industrial power supplies |
| Package | DO-214AC (SMA) - Standardized SMT footprint compatible with JEDEC MS-013AC, supports automated assembly |
Pinout & Package
DO-214AC (SMA) package: surface-mount, molded plastic case with matte tin-plated leads; cathode band marking denotes polarity for unidirectional variants-absent on P4SMA20CAH due to bidirectional symmetry.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional transient conduction path | No fixed anode/cathode; terminals interchangeable-enables placement without orientation check in PCB layout |
| Case | Non-electrical mechanical interface | Plastic body provides electrical isolation and UL 94V-0 flammability rating; no thermal pad or metal tab |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTGB, TCT, HTRB, and ESD |
| Glass passivated junction | Enhances long-term stability and reduces parameter drift under thermal cycling and humidity exposure |
| Fast response time <1.0 ps | Clamps transients before sensitive downstream circuitry experiences overvoltage damage |
| Moisture sensitivity level 1 | Zero bake requirement prior to reflow; supports standard SMT processes without dry-pack handling |
| ISO 7637-2 compliance | Guaranteed immunity to vehicle battery line disturbances including load dump, ignition switch-off, and alternator ripple |
Applications
| Automotive Infotainment Power Rail | LED Driver Input Protection |
|---|---|
Use Scenario: Protecting USB-C PD and CAN-FD power rails in head unit modules exposed to ISO 7637-2 Pulse 3b (capacitive coupling) and Pulse 2b (battery disconnection). IC Role / Device Role / Timing Role: Bidirectional TVS clamping device placed directly at connector entry point to shunt surge energy before LDOs and PMICs. Use Value: Limits rail voltage to ≤27.7 V during 15 A transients, preventing latch-up or gate oxide damage in 28 nm microcontrollers and transceivers. | Use Scenario: Safeguarding constant-current LED driver IC inputs against ESD and switching noise from nearby relay coils in automotive exterior lighting. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12 V input bus, positioned upstream of buck controller and current-sense amplifier. Use Value: Sub-1 μA leakage avoids false triggering of enable logic; DO-214AC footprint allows dense placement near connectors without compromising thermal relief. |
| On-board DC/DC Converter Input | Industrial SMPS Secondary Side |
Use Scenario: Input-side surge suppression for 5 V/3 A buck converter supplying FPGA I/O banks in ADAS camera modules. IC Role / Device Role / Timing Role: First-line transient absorber between vehicle battery feed and input capacitor bank. Use Value: 400 W PPPM rating sustains multiple ISO 7637-2 Pulse 1 events without degradation; TJ max = 150°C aligns with converter thermal profile. | Use Scenario: Output rail clamping in 24 V industrial SMPS where secondary-side feedback loops are vulnerable to back-fed transients from motor drives. IC Role / Device Role / Timing Role: Bidirectional clamp across isolated 24 V output, referenced to local ground to prevent common-mode overvoltage. Use Value: Symmetrical VBR (19.0–21.0 V) ensures equal clamping in both directions, eliminating need for dual unidirectional devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20CA | 600 W PPPM, DO-214AA (SMB) package, higher VC (32.4 V @ 12.3 A) | Better suited for higher-energy transients but requires larger board area | Select when system-level testing shows >400 W surge margin is required and SMB footprint is acceptable |
| 1.5SMC20CA | 1500 W PPPM, DO-214AB (SMC) package, higher VC (36.0 V @ 41.7 A) | Over-specified for typical 12 V automotive nodes; used in main battery line protection | Choose only if protecting high-current distribution points where 1.5 kW pulses occur |
Compared with SMBJ20CA and 1.5SMC20CA, the P4SMA20CAH offers optimal balance of compact DO-214AC size, AEC-Q101 qualification, and 400 W capability-making it ideal for space-constrained, cost-sensitive automotive sub-modules where full SMC/SMB ratings are unnecessary.
Availability
P4SMA20CAH is available at Aetrix Electronics and suitable for automotive infotainment systems, LED lighting controllers, on-board DC/DC converters, and industrial SMPS requiring stable component supply with AEC-Q101 assurance and lead-free compliance.
Supply support for P4SMA20CAH 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, serving automotive, industrial, and consumer markets since 1979.
The P4SMA20CAH belongs to TSC's AEC-Q101-qualified P4SMAx(A)H series of surface-mount TVS diodes, engineered specifically for robust transient suppression in automotive power networks and industrial power conversion systems.
FAQ
What does the "CAH" suffix indicate in P4SMA20CAH?
The "CAH" suffix in P4SMA20CAH denotes a bidirectional configuration with tightened breakdown voltage tolerance (19.0–21.0 V vs. 18.0–22.0 V for "CH") and AEC-Q101 qualification. This variant ensures symmetrical clamping performance and automotive-grade reliability, distinguishing it from unidirectional or non-automotive versions of the same voltage grade.
Is P4SMA20CAH RoHS and halogen-free compliant?
Yes, P4SMA20CAH is RoHS compliant and halogen-free per IEC 61249-2-21. The molding compound meets UL 94V-0 flammability rating, and matte tin-plated leads comply with J-STD-002 solderability standards-ensuring environmental compliance and process compatibility for lead-free reflow assembly.
What is the maximum clamping voltage of P4SMA20CAH under surge conditions?
The maximum clamping voltage (VC) of P4SMA20CAH is 27.7 V at 15.0 A peak pulse current (IPPM) using the 10/1000 μs waveform. This value is guaranteed across temperature and represents the upper limit of voltage seen by protected circuitry during standardized surge events defined in ISO 7637-2.
Can P4SMA20CAH be used in place of a unidirectional TVS diode?
No-P4SMA20CAH is strictly bidirectional and lacks polarity marking; substituting it for a unidirectional TVS (e.g., P4SMA20H) would compromise DC blocking behavior in circuits requiring reverse-bias isolation. Its symmetrical VBR and IR characteristics make it unsuitable where forward conduction must be prevented in one direction.
Does P4SMA20CAH require special handling during PCB assembly?
No-P4SMA20CAH has Moisture Sensitivity Level 1 per J-STD-020, meaning it can be stored and assembled without dry packing or baking. It supports standard lead-free reflow profiles and is qualified for automated placement, making it compatible with high-volume SMT lines without process modification.
P4SMA20CAH 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):
- 17.1V
- Voltage - Breakdown (Min):
- 19V
- Voltage - Clamping (Max) @ Ipp:
- 27.7V
- Current - Peak Pulse (10/1000µs):
- 15A
- 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)
P4SMA20CAH FAQ
1.How can I place an order for P4SMA20CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA20CAH 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 P4SMA20CAH reliable?
The price and inventory of P4SMA20CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA20CAH is usually 5 days.
3.What payment methods are accepted for P4SMA20CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA20CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA20CAH?
P4SMA20CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA20CAH 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 P4SMA20CAH?
For technical support, including P4SMA20CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA20CAH requirements.
6.How does Aetrix verify that P4SMA20CAH is sourced from the original manufacturer or authorized distributors?
All P4SMA20CAH 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 P4SMA20CAH meets industry standards.
7.What is the process for return or replacement of P4SMA20CAH?
All P4SMA20CAH units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA20CAH, 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 P4SMA20CAH part is unused and in its original packaging.
Return procedure for P4SMA20CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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