My Inquiry
My Account
Taiwan Semiconductor Corporation P4SMA20CH
- Part No.:
- P4SMA20CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA20CH.pdf
- Description:
- 400W, 20V, 10%, BIDIRECTIONAL, T
- Quantity:
- Payment:
- Shipping:
Inventory:5,725
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
P4SMA20CH from Taiwan Semiconductor is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode with a 20V working stand-off voltage (VWM = 17.1 V), 22.0 V minimum breakdown voltage (VBR), and 27.7 V maximum clamping voltage (VC) at 15.0 A peak impulse current (IPPM), designed for overvoltage protection in automotive-grade DC/DC converters and SMPS input stages.
For engineers reviewing the P4SMA20CH datasheet, P4SMA20CH pinout, P4SMA20CH application, or P4SMA20CH equivalent, this device offers AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1 ps response time, and DO-214AC (SMA) package compatibility - critical for robust ESD/surge protection in automotive electronics and industrial power supplies.
Technical Context
The P4SMA20CH operates as a unidirectional avalanche diode, clamping transients above its breakdown threshold while maintaining low leakage (<1 µA at VWM) and fast response (<1.0 ps). Its glass-passivated junction ensures stable VBR temperature coefficient (0.090 %/°C) and long-term reliability under repetitive surge stress.
Designed for single-die configuration in DO-214AC (SMA) package, it supports automated placement and meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1 - enabling high-yield SMT assembly without pre-baking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 17.1 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR @ IT=1mA | 19.0–21.0 V - Confirmed avalanche onset range under standardized test current |
| VC @ IPPM=15.0A | 27.7 V - Clamped voltage during 10/1000 µs surge, limiting downstream circuit stress |
| PPPM | 400 W - Peak pulse power handling per single 10/1000 µs waveform |
| IR @ VWM | <1 µA - Minimal reverse leakage ensures negligible standby power loss |
| TJ max | +150 °C - Enables operation in under-hood automotive environments |
| Package | DO-214AC (SMA) - Industry-standard SMT footprint with cathode band polarity marking |
Pinout & Package
DO-214AC (SMA) surface-mount package with axial lead configuration: Cathode (marked end) and Anode (unmarked end). Matte tin-plated leads comply with J-STD-002 solderability requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient clamp output node | Connected to protected line (e.g., +12V rail); conducts during overvoltage to shunt energy to ground |
| Anode | Reference / return path | Typically tied to system ground or low-impedance return plane; completes clamping current path |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics |
| ISO 7637-2 compliant | Withstands defined automotive transient pulses (Pulse 1, 2a, 2b, 3a, 3b) without degradation |
| Glass passivated junction | Enhances long-term stability of VBR and reduces parameter drift across temperature and life cycles |
| Fast response time <1.0 ps | Clamps ESD and fast-rising surges before sensitive ICs experience overstress |
| Moisture Sensitivity Level 1 | Zero bake requirement prior to reflow - simplifies manufacturing and reduces cost |
Applications
| Automotive DC/DC Converters | Industrial SMPS Inputs |
|---|---|
Use Scenario: Protecting 12V-to-5V buck converter inputs against load dump and alternator transients in vehicle infotainment systems. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between input rail and ground to clamp surges exceeding 17.1 V. Use Value: Limits clamping voltage to 27.7 V at 15 A, preventing damage to upstream MOSFETs and controller ICs rated for 30 V absolute maximum. | Use Scenario: Safeguarding AC-DC adapter primary-side rectifier outputs from switching-induced voltage spikes. IC Role / Device Role / Timing Role: Standoff-rated transient suppressor absorbing repetitive 400 W pulses without thermal runaway. Use Value: Maintains <1 µA leakage at 17.1 V, avoiding efficiency loss in no-load standby mode while surviving 1000+ surge events. |
| LED Driver Power Stages | On-Board Battery Management |
Use Scenario: Shielding constant-current LED driver ICs from inductive kickback during PWM dimming in automotive lighting modules. IC Role / Device Role / Timing Role: Fast-response unidirectional clamp on high-side switch node to suppress >100 V transients. Use Value: Sub-1 ps response ensures clamping initiates before LED driver gate oxide breakdown occurs, preserving functional safety integrity. | Use Scenario: Overvoltage protection on 24 V battery monitoring circuits in commercial vehicle telematics units. IC Role / Device Role / Timing Role: Primary surge suppression element on BMS analog front-end supply rail. Use Value: AEC-Q101 qualification and -55°C to +150°C operating range ensure reliable operation across extreme ambient conditions and vibration profiles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20A | 600 W rating, same VWM (17.1 V), but SMB package (DO-214AA) - 1.6 mm wider body | Higher power margin suits higher-energy transients; larger footprint may require PCB redesign | Select when surge energy exceeds 400 W or when existing layout accommodates SMB size |
| 1.5SMC20A | 1500 W rating, same VWM, but larger SMC (DO-214AB) package - 2.5× footprint area of SMA | Used in high-reliability industrial UPS and telecom power where derating is critical | Choose only if board space allows and peak pulse power >400 W is required per event |
Compared with SMBJ20A and 1.5SMC20A, the P4SMA20CH delivers optimal balance of AEC-Q101 compliance, compact DO-214AC footprint, and verified ISO 7637-2 immunity - making it the preferred choice for space-constrained automotive modules requiring validated automotive qualification.
Availability
P4SMA20CH is available at Aetrix Electronics and suitable for automotive DC/DC converters, industrial SMPS inputs, and LED driver power stages requiring stable component supply with full traceability and lifecycle support.
Supply support for P4SMA20CH 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, and rectifiers with global automotive and industrial certifications.
The P4SMA series is part of TSC's AEC-Q101-qualified transient suppression portfolio, engineered specifically for robust overvoltage protection in harsh automotive and industrial power environments.
FAQ
What is the polarity configuration of the P4SMA20CH?
The P4SMA20CH is a unidirectional TVS diode with clearly marked cathode (banded end). It conducts only when the cathode is at a higher potential than the anode - ideal for protecting positive supply rails against overvoltage. This polarity must be observed during PCB layout to ensure proper clamping behavior and avoid forward conduction during normal operation.
Does the P4SMA20CH meet automotive qualification standards?
Yes, the P4SMA20CH is AEC-Q101 qualified and explicitly tested to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b transient immunity requirements. Its construction - including glass passivation, MSL Level 1 handling, and -55°C to +150°C operating range - validates its suitability for under-hood and chassis-mounted automotive electronics.
What is the maximum clamping voltage of the P4SMA20CH under surge conditions?
The P4SMA20CH has a maximum clamping voltage (VC) of 27.7 V at 15.0 A peak impulse current (IPPM), measured using the standard 10/1000 µs double-exponential waveform. This value ensures protected downstream components - such as 30 V-rated MOSFETs or controllers - remain within safe operating limits during transient events.
Can the P4SMA20CH be used in bidirectional configurations?
No - the P4SMA20CH is unidirectional only. For bidirectional protection, Taiwan Semiconductor specifies the P4SMA20CAH variant (with "CAH" suffix), which provides symmetrical clamping in both polarities. Using P4SMA20CH in reverse-biased AC applications risks permanent failure due to lack of reverse avalanche capability.
What packaging and reel quantity is available for the P4SMA20CH?
The P4SMA20CH is supplied in DO-214AC (SMA) package on 7,500-piece tape-and-reel format, optimized for high-speed pick-and-place assembly. The reel complies with EIA-481-D standards, and each unit features laser-marked polarity band and TSC logo for full traceability and counterfeit mitigation.
P4SMA20CH 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):
- 16.2V
- Voltage - Breakdown (Min):
- 18V
- Voltage - Clamping (Max) @ Ipp:
- 29.1V
- Current - Peak Pulse (10/1000µs):
- 14A
- 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)
P4SMA20CH FAQ
1.How can I place an order for P4SMA20CH through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA20CH 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 P4SMA20CH reliable?
The price and inventory of P4SMA20CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA20CH is usually 5 days.
3.What payment methods are accepted for P4SMA20CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA20CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA20CH?
P4SMA20CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA20CH 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 P4SMA20CH?
For technical support, including P4SMA20CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA20CH requirements.
6.How does Aetrix verify that P4SMA20CH is sourced from the original manufacturer or authorized distributors?
All P4SMA20CH 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 P4SMA20CH meets industry standards.
7.What is the process for return or replacement of P4SMA20CH?
All P4SMA20CH units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA20CH, 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 P4SMA20CH part is unused and in its original packaging.
Return procedure for P4SMA20CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMA20CH 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…
