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Taiwan Semiconductor Corporation P4SMA170
- Part No.:
- P4SMA170
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA170.pdf
- Description:
- 400W, 170V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:6,072
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Product details
Overview
P4SMA170 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 a working stand-off voltage of 138V, breakdown voltage range 153–187V at 1mA, and clamping voltage of 244V at 1.7A. It protects DC/DC converters and industrial power rails against ESD and surge events per ISO 7637-2.
For engineers reviewing the P4SMA170 datasheet, P4SMA170 pinout, P4SMA170 application, or P4SMA170 equivalent, key selection criteria include clamping voltage margin relative to system rail, leakage current at operating voltage, thermal derating above 25°C, and compliance with automotive transients Pulse 1/2a/2b/3a/3b.
Technical Context
The P4SMA170 employs a glass-passivated silicon junction optimized for fast transient response (<1.0ps) and low leakage (<1μA at VWM). Its unidirectional configuration provides asymmetric protection-reverse-biased clamping during overvoltage while forward-conducting only under fault conditions up to 3.5V at 25A.
Designed for surface-mount automation, it meets J-STD-020 moisture sensitivity level 1 and JESD201 Class 2 whisker resistance. The DO-214AC case uses UL 94V-0 molding compound and matte tin-plated leads compliant with J-STD-002 solderability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 138 V - Maximum continuous reverse operating voltage before significant leakage begins |
| VBR min/max | 153–187 V @ 1 mA - Breakdown occurs within this range; ensures reliable triggering above system nominal rail |
| VC @ IPPM | 244 V @ 1.7 A (10/1000μs) - Clamped voltage seen by protected circuit during worst-case surge |
| PPPM | 400 W - Peak pulse power handling capability under standardized 10/1000μs waveform |
| IR @ VWM | <1 μA - Negligible standby power loss and minimal impact on high-impedance sensing nodes |
| TJ max | +150 °C - Enables operation in under-hood or enclosed industrial environments without forced cooling |
Pinout & Package
DO-214AC (SMA) surface-mount package: cathode band marked on body; anode and cathode terminals aligned for standard PCB footprint per manufacturer-recommended pad layout. Weight ≈ 0.060 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or low-voltage rail; completes clamping path during reverse overvoltage |
| Cathode | Protected line input | Connected to supply rail (e.g., 138V DC bus); blocks normal operation, conducts during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable VBR over temperature and lifetime; eliminates passivation-related drift in harsh environments |
| Fast response time <1.0 ps | Clamps ESD events before IC damage thresholds are exceeded, critical for unprotected microcontroller I/O |
| ISO 7637-2 compliance | Validated for automotive load-dump and inductive-switching transients (Pulse 1/2a/2b/3a/3b) |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS directives; supports green manufacturing and end-of-life recycling |
Applications
| Automotive DC/DC Converter Protection | Industrial SMPS Input Stage |
|---|---|
Use Scenario: 138V intermediate bus in 48V-to-12V automotive buck converter exposed to load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed across input capacitor to clamp surges before they reach controller and MOSFETs. Use Value: Limits transient voltage to ≤244V, maintaining >10V margin below MOSFET VDS rating and preventing gate oxide stress. | Use Scenario: 138V output rail of telecom-grade AC/DC front-end feeding downstream isolated DC/DC modules. IC Role / Device Role / Timing Role: Primary overvoltage clamp on secondary-side high-voltage rail, coordinated with OVP feedback loop. Use Value: Absorbs 400W pulses without degradation, enabling single-device protection instead of stacked Zener arrays. |
| LED Driver Overvoltage Clamp | Rail Isolation in Battery Management Systems |
Use Scenario: Constant-current LED string powered from 138V bus in streetlight fixture subject to lightning-induced surges. IC Role / Device Role / Timing Role: Standoff protector parallel to LED load, triggered only during abnormal line excursions. Use Value: Sub-1μA leakage avoids false dimming or flicker during normal operation; 244V clamping preserves LED forward voltage headroom. | Use Scenario: Isolated 138V auxiliary supply powering CAN transceivers and sensors in high-voltage battery pack monitoring unit. IC Role / Device Role / Timing Role: Secondary-side TVS safeguarding isolated DC/DC output against coupling from primary-side transients. Use Value: Prevents latch-up or burnout in isolated gate drivers and analog front-ends during ISO 7637-2 Pulse 2b events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ170A | Same VWM (138V), higher PPPM (600W), DO-214AA package (larger footprint) | Preferred where higher surge margin or board space allows larger SMA variant | Select SMBJ170A when system-level testing requires >400W margin or legacy layout accommodates DO-214AA |
| 1.5SMC170A | Same VWM and VC, but through-hole DO-214AB package; 1500W rating (10/1000μs) | Used in prototyping, high-reliability military/aerospace where leaded mounting preferred | Choose 1.5SMC170A only if through-hole assembly is mandated or 1500W surge immunity is required beyond ISO 7637-2 scope |
Compared with SMBJ170A and 1.5SMC170A, the P4SMA170 offers optimal balance of 400W surge capability, compact DO-214AC footprint, and automated SMT compatibility-making it ideal for space-constrained automotive and industrial DC/DC designs requiring validated ISO 7637-2 protection.
Availability
P4SMA170 is available at Aetrix Electronics and suitable for automotive DC/DC converters, industrial switching mode power supplies, and LED driver systems requiring stable component supply with full traceability and lifecycle management.
Supply support for P4SMA170 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 for industrial, automotive, and consumer applications.
The P4SMA series was developed specifically for surface-mount surge protection in high-density power conversion systems, emphasizing reliability under repetitive transients and compatibility with automated assembly processes.
FAQ
What is the maximum clamping voltage of P4SMA170 under standard surge conditions?
The P4SMA170 has a maximum clamping voltage (VC) of 244 V when subjected to a 10/1000μs impulse current waveform at its rated peak pulse current of 1.7 A. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during transient events. The P4SMA170 maintains this clamping performance across its specified operating junction temperature range of –55°C to +150°C.
Is P4SMA170 suitable for bidirectional transient protection?
No, P4SMA170 is a unidirectional TVS diode intended for DC rail protection where polarity is fixed. For bidirectional applications such as AC lines or data bus protection, TSC specifies variants with "C" or "CA" suffixes (e.g., P4SMA170C). Using P4SMA170 in reverse-biased AC configurations may result in unintended conduction or failure. Always verify polarity marking and application topology before selecting P4SMA170.
What is the leakage current specification for P4SMA170 at its working voltage?
The P4SMA170 exhibits a maximum reverse leakage current (IR) of 1 μA when biased at its working stand-off voltage (VWM) of 138 V and tested at 25°C. This ultra-low leakage ensures minimal power loss in standby mode and prevents interference with high-impedance monitoring circuits. The IR remains below 1 μA across the full operating temperature range, supporting stable performance in thermally demanding environments.
Does P4SMA170 meet automotive surge immunity standards?
Yes, P4SMA170 is explicitly rated to meet ISO 7637-2 requirements for automotive transient immunity, covering Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling and ignition noise). Its 400W peak pulse power rating and sub-1.0ps response time ensure robust clamping behavior during these standardized waveforms. System-level validation per ISO 16750-2 is still recommended for final vehicle integration.
What package type and mounting method does P4SMA170 use?
P4SMA170 uses the DO-214AC (SMA) surface-mount package with matte tin-plated leads compliant with J-STD-002 solderability. It is designed for reflow soldering in automated placement lines and features a cathode band marking for polarity identification. The package weighs approximately 0.060 g and conforms to UL 94V-0 flammability rating, making it suitable for high-density PCB layouts in automotive and industrial power systems.
P4SMA170 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
P4SMA170 FAQ
1.How can I place an order for P4SMA170 through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA170 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 P4SMA170 reliable?
The price and inventory of P4SMA170 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA170 is usually 5 days.
3.What payment methods are accepted for P4SMA170?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA170 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA170?
P4SMA170 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA170 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 P4SMA170?
For technical support, including P4SMA170 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA170 requirements.
6.How does Aetrix verify that P4SMA170 is sourced from the original manufacturer or authorized distributors?
All P4SMA170 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 P4SMA170 meets industry standards.
7.What is the process for return or replacement of P4SMA170?
All P4SMA170 units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA170, 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 P4SMA170 part is unused and in its original packaging.
Return procedure for P4SMA170:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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