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Taiwan Semiconductor Corporation P4SMA170H
- Part No.:
- P4SMA170H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA170H.pdf
- Description:
- 400W, 170V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:7,583
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Product details
Overview
P4SMA170H from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, rated for 400W peak pulse power (10/1000μs), with 138V working stand-off voltage (VWM), 153–187V breakdown voltage (VBR @ 1mA), and 244V maximum clamping voltage (VC @ 1.7A). It protects DC/DC converters and automotive power rails against ESD and load-dump transients.
For engineers reviewing the P4SMA170H datasheet, P4SMA170H pinout, P4SMA170H application, or P4SMA170H equivalent, key selection criteria include clamping performance at 1.7A surge, AEC-Q101 qualification for automotive use, DO-214AC thermal and mechanical compatibility, and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b.
Technical Context
The P4SMA170H operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds VBR (153–187V), clamping transient energy to ≤244V at 1.7A. Its glass-passivated junction ensures stable leakage (<1μA at 138V) and fast response (<1.0ps).
Designed for automotive-grade reliability, it meets AEC-Q101 stress tests and ISO 7637-2 immunity requirements for vehicle electrical systems, with operating junction temperature from –55°C to +150°C and moisture sensitivity level 1 per J-STD-020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 138 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC bias margin. |
| VBR min/max | 153 V / 187 V @ 1 mA - Breakdown voltage range at test current; determines turn-on threshold tolerance. |
| VC @ IPPM | 244 V @ 1.7 A (10/1000μs) - Clamped voltage during worst-case surge; sets upper limit of protected circuit stress. |
| PPPM | 400 W - Peak pulse power handling capability; enables robust protection against ISO 7637-2 load-dump pulses. |
| IR @ VWM | <1 μA - Reverse leakage at stand-off voltage; ensures minimal standby power loss and signal integrity. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive environments. |
Pinout & Package
DO-214AC (SMA) surface-mount package: cathode-banded single-ended configuration with matte tin-plated leads, UL 94V-0 molding compound, and 0.060g mass. Polarity marked by cathode band; terminals are anode and cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; tied to system ground or low-side reference in TVS placement. | Connects to protected line's return path; must be low-impedance to ensure effective clamping during transients. |
| Cathode | Transient voltage sensing and clamping node; connected to the line being protected (e.g., 12V rail). | Receives surge energy and avalanches into conduction when VREV > VBR; requires short, low-inductance trace to minimize overshoot. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTOL, TC, HAST, and UHAST - enables use in engine control, body electronics, and ADAS modules. |
| Glass passivated junction | Stable VBR tolerance and low IR drift over temperature and lifetime - critical for long-term reliability in harsh environments. |
| Clamping voltage ≤244 V @ 1.7 A | Ensures downstream ICs (e.g., MCU power supplies or CAN transceivers) remain below absolute maximum ratings during ISO 7637-2 Pulse 5a (load dump). |
| Fast response time <1.0 ps | Enables suppression of nanosecond-scale ESD events (IEC 61000-4-2) before sensitive circuitry is damaged. |
Applications
| Automotive Power Rail Protection | On-board DC/DC Converter Input |
|---|---|
Use Scenario: Protecting 12V/24V battery-fed ECUs against load-dump transients up to 35V sustained and 60V spikes per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and input filter capacitor, clamping surges before they reach LDOs or buck controllers. Use Value: Limits peak voltage to 244V at 1.7A, preserving input stage reliability without derating converter components. | Use Scenario: Safeguarding isolated DC/DC converter primary-side inputs in infotainment head units exposed to conducted noise from motor drivers and alternators. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing repetitive switching noise and coupled transients on 12V input prior to transformer primary winding. Use Value: Maintains <1μA leakage at 138V, avoiding quiescent current penalty while delivering 400W pulse immunity. |
| Industrial SMPS Input Stage | LED Driver Power Supply Protection |
Use Scenario: Front-end protection for 100–200V DC input switch-mode power supplies used in factory automation controls. IC Role / Device Role / Timing Role: Primary-side TVS suppressing line-induced surges and inductive kickback from contactors or solenoids. Use Value: With VWM = 138V and VC = 244V, provides 30% margin above nominal 170V DC bus while limiting clamp overshoot. | Use Scenario: Transient suppression on constant-current LED driver inputs in streetlight or signage applications subject to lightning-induced surges. IC Role / Device Role / Timing Role: Unidirectional TVS mounted across bulk capacitor input to absorb 10/1000μs surges per IEC 61000-4-5 Level 3. Use Value: Delivers 244V clamping at 1.7A with ±5% VBR tolerance, ensuring consistent protection across production batches. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ170A | DO-214AA (SMB) package; same VWM/VBR/VC specs but 600W rating; higher thermal mass. | Preferred where board space allows larger footprint and higher surge margin is required. | Select SMBJ170A if layout permits DO-214AA and system-level testing demands >400W pulse handling. |
| 1.5SMC170A | DO-214AB (SMC) package; 1500W rating; identical electrical parameters but larger size and higher IPPM (3.2A). | Suitable for high-energy industrial surge environments (e.g., railway or grid-tied inverters). | Choose 1.5SMC170A only when PCB real estate and thermal design support SMC footprint and higher surge duty cycle. |
Compared with SMBJ170A and 1.5SMC170A, the P4SMA170H offers optimal balance of compact DO-214AC footprint, AEC-Q101 qualification, and 400W protection - making it ideal for space-constrained automotive and embedded power rails where qualification and reliability are prioritized over raw power rating.
Availability
P4SMA170H is available at Aetrix Electronics and suitable for automotive power rail protection, on-board DC/DC converter input stages, and industrial SMPS front-end surge suppression requiring stable component supply and AEC-Q101-compliant sourcing.
Supply support for P4SMA170H 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-qualified product lines.
The P4SMA series is designed specifically for automotive and industrial transient suppression, emphasizing AEC-Q101 reliability, ISO 7637-2 compliance, and surface-mount manufacturability in DO-214AC packaging.
FAQ
Is P4SMA170H unidirectional or bidirectional?
The P4SMA170H is a unidirectional TVS diode, indicated by the absence of "CAH" suffix and confirmed by its cathode-band marking and single-polarity clamping behavior. It conducts only during reverse overvoltage events and blocks forward current like a standard diode. Bidirectional variants (e.g., P4SMA170AH) use CAH suffix and symmetric breakdown in both directions.
What is the maximum clamping voltage of P4SMA170H at its rated surge current?
The P4SMA170H has a maximum clamping voltage (VC) of 244 V at 1.7 A peak pulse current using the 10/1000μs waveform. This value is measured under standardized conditions per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during transient events.
Does P4SMA170H meet automotive qualification standards?
Yes, the P4SMA170H is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements. It is rated for operating junction temperatures from –55°C to +150°C and classified as MSL Level 1, making it suitable for under-hood and body-control module applications.
What is the reverse leakage current specification for P4SMA170H?
The P4SMA170H specifies maximum reverse leakage current (IR) of less than 1 μA at its working stand-off voltage (VWM = 138 V) and TA = 25°C. This low leakage ensures minimal power loss and avoids interference with high-impedance sensing circuits upstream of the TVS.
Can P4SMA170H be used in place of P4SMA170AH?
No - P4SMA170H is unidirectional, while P4SMA170AH is bidirectional (with "A" denoting tighter VBR tolerance and "H" plus "CAH" suffix indicating bidirectional construction). Substituting them requires verifying circuit polarity, clamping symmetry, and system-level surge directionality; they are not functionally interchangeable without design review.
P4SMA170H 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):
- 138V
- Voltage - Breakdown (Min):
- 153V
- Voltage - Clamping (Max) @ Ipp:
- 244V
- Current - Peak Pulse (10/1000µs):
- 1.7A
- 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)
P4SMA170H FAQ
1.How can I place an order for P4SMA170H through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA170H 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 P4SMA170H reliable?
The price and inventory of P4SMA170H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA170H is usually 5 days.
3.What payment methods are accepted for P4SMA170H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA170H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA170H?
P4SMA170H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA170H 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 P4SMA170H?
For technical support, including P4SMA170H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA170H requirements.
6.How does Aetrix verify that P4SMA170H is sourced from the original manufacturer or authorized distributors?
All P4SMA170H 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 P4SMA170H meets industry standards.
7.What is the process for return or replacement of P4SMA170H?
All P4SMA170H units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA170H, 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 P4SMA170H part is unused and in its original packaging.
Return procedure for P4SMA170H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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