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Taiwan Semiconductor Corporation P4SMA43H
- Part No.:
- P4SMA43H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA43H.pdf
- Description:
- 400W, 43V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:2,101
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Product details
Overview
P4SMA43H from Taiwan Semiconductor is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, with breakdown voltage 38.7–47.3V at 1mA, working stand-off voltage 34.8V, clamping voltage 61.9V at 6.7A (10/1000μs), and AEC-Q101 qualification for automotive-grade surge protection in DC/DC converters.
For engineers reviewing the P4SMA43H datasheet, P4SMA43H pinout, P4SMA43H application, or P4SMA43H equivalent, key selection criteria include unidirectional polarity, 61.9V clamping under 6.7A surge, <1μA leakage at 34.8V, 150°C max junction temperature, and ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance for vehicle electronics robustness.
Technical Context
The P4SMA43H operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 38.7–47.3V breakdown range, clamping transients to ≤61.9V within <1.0ps response time. It sustains 400W peak pulse power per 10/1000μs waveform and exhibits <1μA reverse leakage at rated 34.8V stand-off voltage.
Designed for automotive and industrial environments, it meets AEC-Q101 stress testing and ISO 7637-2 immunity requirements for load dump and switching transients. Its glass-passivated junction ensures stable VBR temperature coefficient of 0.101%/°C and moisture sensitivity level 1 per J-STD-020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR @ IT | 38.7–47.3 V at 1 mA test current - defines reliable avalanche initiation threshold across temperature and unit variation |
| VWM | 34.8 V - maximum continuous reverse operating voltage before significant leakage begins |
| VC @ IPPM | 61.9 V at 6.7 A (10/1000 μs) - peak clamped voltage protecting downstream circuitry during surge events |
| PPPM | 400 W - peak pulse power handling capability under standardized transient waveform |
| IR @ VWM | <1 μA - ultra-low reverse leakage ensuring minimal standby power loss and signal integrity |
| TJ max | 150 °C - maximum junction temperature enabling operation in under-hood or high-ambient industrial locations |
| Package | DO-214AC (SMA) - industry-standard surface-mount outline with matte tin-plated leads, J-STD-002 solderable |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with cathode band marking; dual axial leads; 0.060 g typical weight; UL 94V-0 flammability rating; polarity indicated by cathode band for unidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side in unidirectional TVS configuration; conducts during forward surge (IFSM = 40 A) |
| Cathode (banded end) | Avalanche clamping terminal | Connected to protected line; initiates clamping when reverse voltage exceeds VBR; defines polarity and orientation on PCB |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS modules requiring reliability under thermal cycling, humidity, and mechanical shock |
| Glass passivated junction | Enhances long-term stability of VBR and reduces parameter drift over life and temperature extremes |
| Fast response time <1.0 ps | Enables suppression of nanosecond-scale ESD and fast-switching noise before sensitive ICs are damaged |
| ISO 7637-2 compliance | Guarantees robustness against real-world automotive transients: Pulse 1 (inductive load dump), Pulse 2a/2b (switching spikes), Pulse 3a/3b (line impedance coupling) |
| Moisture sensitivity level 1 | Allows unlimited floor life before reflow; eliminates baking requirement and simplifies SMT manufacturing flow |
Applications
| Automotive Body Control Module (BCM) | Industrial DC/DC Converter Input Stage |
|---|---|
Use Scenario: Protects microcontroller I/O and CAN transceiver power rails from load dump and alternator ripple in BCM units. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 12V supply rail and ground to clamp surges up to 400W without affecting normal operation. Use Value: Maintains VWM = 34.8V margin above nominal 12V system while clamping to 61.9V-well below typical 65V IC absolute maximum ratings. | Use Scenario: Shields primary-side MOSFET gate drivers and controller ICs from switching-induced transients in isolated 48V-to-12V DC/DC converters. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing repetitive 10/1000μs pulses at up to 6.7A peak current on input bus lines. Use Value: 0.101%/°C VBR tempco ensures stable clamping across -40°C to +125°C ambient, critical for industrial thermal cycling. |
| LED Driver Power Supply | Telecom Power Interface |
Use Scenario: Safeguards constant-current LED driver ICs from inductive kickback during dimming FET switching in streetlight systems. IC Role / Device Role / Timing Role: Mounted across input bulk capacitor terminals to absorb energy from transformer leakage inductance and layout parasitics. Use Value: 400W peak power rating handles worst-case 8.3ms half-sine surges (IFSM = 40 A), preventing latch-up or gate oxide rupture in driver ICs. | Use Scenario: Provides secondary-side surge protection on 48V telecom power feeds entering base station control boards. IC Role / Device Role / Timing Role: Unidirectional TVS placed after DC-DC converter output to protect PMICs and FPGA power domains from external line surges. Use Value: <1μA leakage at 34.8V ensures no measurable impact on 48V rail regulation or standby current budgets in always-on systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ43A | Same 43V nominal breakdown but bidirectional; higher VC = 69.4V at 5.8A; SMB package (larger footprint) | Required where bidirectional protection needed (e.g., AC-coupled data lines); not suitable for unidirectional DC rail protection without redesign | Select only if bidirectional clamping is required and PCB layout accommodates SMB size |
| 1.5SMC43A | Same 43V rating, unidirectional, but 1500W rating; larger DO-214AB (SMC) package; higher IPPM = 21.3A | Used in high-energy industrial motor drives or railway power supplies where 400W is insufficient | Choose when surge energy exceeds P4SMA43H's 400W limit and board space allows SMC outline |
Compared with SMBJ43A and 1.5SMC43A, the P4SMA43H offers optimal balance of compact DO-214AC footprint, automotive qualification, and precise 34.8V stand-off for 12V/24V DC systems-making it ideal for space-constrained, AEC-Q101–mandated designs without over-engineering surge capacity.
Availability
P4SMA43H is available at Aetrix Electronics and suitable for automotive body electronics, industrial DC/DC converters, LED lighting power supplies, and telecom interface protection requiring stable component supply and AEC-Q101–compliant surge resilience.
Supply support for P4SMA43H 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, specializing in TVS diodes, rectifiers, MOSFETs, and power management devices.
The P4SMA series belongs to TSC's AEC-Q101–qualified transient suppression portfolio, engineered specifically for automotive and harsh-environment industrial applications demanding high-reliability, low-leakage, and fast-response overvoltage protection.
FAQ
What is the polarity configuration of the P4SMA43H?
The P4SMA43H is a unidirectional TVS diode, with cathode marked by a band on the DO-214AC (SMA) package body. It conducts in forward bias like a standard diode and clamps transients only in reverse bias above its 38.7–47.3V breakdown range. This polarity must be observed during PCB layout to ensure correct protection directionality on DC rails.
Does the P4SMA43H meet automotive qualification standards?
Yes, the P4SMA43H is AEC-Q101 qualified and tested per ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b waveforms. Its glass-passivated junction, moisture sensitivity level 1, and 150°C maximum junction temperature confirm suitability for under-hood and chassis-mounted automotive electronics where reliability under thermal, mechanical, and electrical stress is mandatory.
What is the clamping voltage of the P4SMA43H under surge conditions?
The P4SMA43H has a maximum clamping voltage VC of 61.9V at 6.7A peak pulse current (10/1000μs waveform). This value represents the upper limit of voltage seen by protected circuitry during a standardized transient event and is critical for ensuring downstream ICs remain within their absolute maximum voltage ratings.
Can the P4SMA43H be used in bidirectional signal line protection?
No-the P4SMA43H is unidirectional and unsuitable for bidirectional signal lines such as USB, RS-485, or CAN without additional circuitry. For such applications, a bidirectional variant like P4SMA43AH (with CAH suffix) or SMBJ43A should be selected, as they provide symmetrical clamping in both polarities and avoid forward conduction during normal signal swing.
What is the maximum reverse leakage current specification for the P4SMA43H?
The P4SMA43H specifies maximum reverse leakage current IR of less than 1μA at its working stand-off voltage VWM = 34.8V and TA = 25°C. This ultra-low leakage minimizes power loss in battery-backed or energy-sensitive systems and prevents false triggering in high-impedance sensing circuits adjacent to the protected node.
P4SMA43H 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):
- 34.8V
- Voltage - Breakdown (Min):
- 38.7V
- Voltage - Clamping (Max) @ Ipp:
- 61.9V
- Current - Peak Pulse (10/1000µs):
- 6.7A
- 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)
P4SMA43H FAQ
1.How can I place an order for P4SMA43H through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA43H 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 P4SMA43H reliable?
The price and inventory of P4SMA43H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA43H is usually 5 days.
3.What payment methods are accepted for P4SMA43H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA43H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA43H?
P4SMA43H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA43H 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 P4SMA43H?
For technical support, including P4SMA43H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA43H requirements.
6.How does Aetrix verify that P4SMA43H is sourced from the original manufacturer or authorized distributors?
All P4SMA43H 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 P4SMA43H meets industry standards.
7.What is the process for return or replacement of P4SMA43H?
All P4SMA43H units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA43H, 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 P4SMA43H part is unused and in its original packaging.
Return procedure for P4SMA43H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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