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Taiwan Semiconductor Corporation P4SMA170AH
- Part No.:
- P4SMA170AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA170AH.pdf
- Description:
- TVS DIODE 145VWM 234VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,578
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Product details
Overview
P4SMA170AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, rated for 400W peak pulse power, 170V breakdown voltage (162–179V), and 145V working stand-off voltage. It clamps transients to ≤234V at 1.8A (10/1000μs waveform) and supports automotive-grade reliability per AEC-Q101.
For engineers reviewing the P4SMA170AH datasheet, P4SMA170AH pinout, P4SMA170AH application, or P4SMA170AH equivalent, key selection criteria include clamping voltage margin vs. system rail, leakage current at operating voltage, ISO 7637-2 pulse immunity, and DO-214AC thermal performance in high-density DC/DC converter layouts.
Technical Context
The P4SMA170AH operates as a unidirectional avalanche diode with glass-passivated junction, optimized for fast transient suppression in 12–48V automotive and industrial power rails. Its 1.0ps typical response time and <1μA reverse leakage at 145V ensure minimal standby loss and rapid overvoltage shutdown.
Designed for compliance with ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b, it withstands repetitive load-dump and inductive-switching surges without degradation. The device features a maximum clamping voltage of 234V at 1.8A, enabling robust protection of downstream MOSFETs and controllers in on-board DC/DC converters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR min/max | 162 V / 179 V - defines minimum and maximum guaranteed avalanche initiation range at 1mA test current |
| VWM | 145 V - maximum continuous reverse operating voltage before significant leakage begins |
| IPPM | 1.8 A - peak impulse current under 10/1000μs waveform, directly determining surge energy handling |
| VC@IPPM | 234 V - clamping voltage during full-rated surge, sets upper bound for protected circuit stress |
| PPPM | 400 W - peak pulse power rating, used to size TVS for specific transient energy (e.g., ISO 7637-2 Pulse 5a) |
| TJ max | +150 °C - maximum junction temperature, supports operation in under-hood automotive environments |
| IR@VWM | <1 μA - ultra-low reverse leakage ensures negligible power loss in always-on 48V systems |
Pinout & Package
DO-214AC (SMA) surface-mount package with cathode band marking; matte tin-plated leads compliant with J-STD-002 solderability and JESD201 Class 2 whisker resistance; weight ≈0.060g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional configuration |
| Cathode (banded end) | Avalanche clamping terminal | Connected to protected line (e.g., 48V rail); conducts when voltage exceeds VBR in reverse bias |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics including engine control, body modules, and ADAS power supplies |
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity stress |
| ISO 7637-2 compliance | Guarantees survivability against real-world vehicle electrical disturbances including load dump and inductive switching |
| Moisture sensitivity level 1 | Enables standard SMT reflow without baking, reducing manufacturing cost and process complexity |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU environmental directives for green electronics manufacturing |
Applications
| Switching Mode Power Supply (SMPS) | On-board DC/DC Converter |
|---|---|
Use Scenario: Protection of primary-side MOSFETs and secondary-side rectifiers against flyback voltage spikes and ESD events in offline AC/DC adapters. IC Role / Device Role / Timing Role: Unidirectional TVS placed across transformer windings or output rails to clamp transients before they reach controller ICs or synchronous rectifiers. Use Value: Limits peak voltage to ≤234V, preventing gate oxide rupture in 200V-rated MOSFETs and ensuring >100k-cycle reliability under repeated surge stress. | Use Scenario: Input rail protection in 48V-to-12V or 48V-to-5V buck converters used in automotive infotainment and ADAS ECUs. IC Role / Device Role / Timing Role: Standoff-rated TVS connected between input rail and ground to absorb ISO 7637-2 Pulse 1 (inductive switch-off) and Pulse 5a (load dump) energy. Use Value: Withstands 1.8A peak impulse at 145V working voltage, maintaining system uptime during battery disconnection events without derating. |
| Lighting Application | Adapters |
Use Scenario: Overvoltage protection in LED driver circuits subjected to lightning-induced surges on long cable runs in commercial lighting systems. IC Role / Device Role / Timing Role: Clamping device placed at driver input to limit transient voltage before it reaches PWM controller and current-sense amplifier. Use Value: Fast 1.0ps response and low 234V clamping enable reliable operation even with sub-microsecond rise-time surges from nearby lightning strikes. | Use Scenario: Secondary-side surge suppression in universal-input wall adapters powering IoT sensors and smart home devices. IC Role / Device Role / Timing Role: Unidirectional TVS installed across DC output terminals to prevent damage from reverse polarity connection or external ESD injection. Use Value: <1μA leakage at 145V ensures no measurable impact on no-load efficiency, critical for Energy Star Tier 2 compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ170A | Same VWM (139V), higher IPPM (2.1A), larger SMB package (DO-214AA) | Higher thermal mass suits higher ambient temp designs; requires larger PCB footprint | Select when board space allows and junction temperature margin must exceed +135°C |
| 1.5SMC170A | Same VBR range, 1500W rating, DO-214AB (SMC) package | Designed for higher-energy transients (e.g., MIL-STD-1275E); overqualified for ISO 7637-2 | Choose only if legacy design uses SMC footprint or surge requirements exceed 400W |
Compared with SMBJ170A and 1.5SMC170A, the P4SMA170AH offers optimal balance of compact DO-214AC size, AEC-Q101 qualification, and precise 400W/145V standoff matching common 48V automotive subsystems-without over-engineering or layout penalty.
Availability
P4SMA170AH is available at Aetrix Electronics and suitable for switching mode power supplies, on-board DC/DC converters, and automotive lighting applications requiring stable component supply and AEC-Q101-compliant surge protection.
Supply support for P4SMA170AH 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, and power MOSFETs for automotive and industrial markets.
The P4SMA series belongs to TSC's AEC-Q101-qualified surface-mount TVS portfolio, engineered specifically for ISO 7637-2-compliant transient suppression in space-constrained automotive power systems.
FAQ
What is the maximum clamping voltage of the P4SMA170AH under rated surge conditions?
The P4SMA170AH has a maximum clamping voltage (VC) of 234 V when subjected to its rated peak pulse current of 1.8 A using the 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that protected circuitry will not experience voltages exceeding this threshold during standardized surge events such as ISO 7637-2 Pulse 1 or 2b. The P4SMA170AH maintains this clamping performance across its full operating temperature range of –55°C to +150°C.
Is the P4SMA170AH suitable for bidirectional transient protection?
No, the P4SMA170AH is a unidirectional TVS diode intended for single-polarity surge suppression. For bidirectional applications, Taiwan Semiconductor specifies the P4SMA170CAH variant (with "CAH" suffix), which provides symmetrical clamping in both forward and reverse directions. Using the P4SMA170AH in a bidirectional configuration would result in forward conduction during negative transients, potentially damaging the device or failing to protect the circuit. Always verify polarity marking and suffix designation before layout integration.
What packaging and reel quantity is available for the P4SMA170AH?
The P4SMA170AH is supplied in DO-214AC (SMA) package on 7,500-unit tape-and-reel format, compliant with EIA-481 standards. The reel includes moisture-sensitive level 1 (MSL-1) packaging per J-STD-020, eliminating bake requirements prior to SMT assembly. Each reel is marked with date code (YW), factory code (F), and part-specific marking code (RPJ) for full traceability. Aetrix Electronics supports custom reel splits and tube packaging upon request for prototyping and low-volume production.
Does the P4SMA170AH meet automotive qualification standards?
Yes, the P4SMA170AH is AEC-Q101 qualified, having passed stress tests including high-temperature operating life (HTOL), temperature cycling, and unbiased highly accelerated stress testing (uHAST). It also meets ISO 7637-2 for Pulse 1 (inductive switch-off), Pulse 2a/2b (battery feed interruption), and Pulse 3a/3b (capacitive coupling), making it suitable for front-end protection in automotive ECUs, body control modules, and infotainment power supplies. Full qualification reports are available under NDA from Taiwan Semiconductor.
How does the P4SMA170AH compare to older P4SMA170H in terms of electrical parameters?
The P4SMA170AH offers tighter breakdown voltage tolerance (162–179 V) versus the standard P4SMA170H (153–187 V), resulting in more predictable clamping behavior and improved margin control in safety-critical designs. Both share identical package, power rating (400 W), and thermal specs, but the "A" suffix denotes enhanced VBR consistency-critical for designs where overvoltage margin must be held within ±5% of nominal rail. The P4SMA170AH also exhibits lower temperature coefficient (0.108 %/°C) than earlier revisions, improving stability across wide ambient ranges.
P4SMA170AH 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):
- 145V
- Voltage - Breakdown (Min):
- 162V
- Voltage - Clamping (Max) @ Ipp:
- 234V
- Current - Peak Pulse (10/1000µs):
- 1.8A
- 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)
P4SMA170AH FAQ
1.How can I place an order for P4SMA170AH through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA170AH 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 P4SMA170AH reliable?
The price and inventory of P4SMA170AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA170AH is usually 5 days.
3.What payment methods are accepted for P4SMA170AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA170AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA170AH?
P4SMA170AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA170AH 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 P4SMA170AH?
For technical support, including P4SMA170AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA170AH requirements.
6.How does Aetrix verify that P4SMA170AH is sourced from the original manufacturer or authorized distributors?
All P4SMA170AH 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 P4SMA170AH meets industry standards.
7.What is the process for return or replacement of P4SMA170AH?
All P4SMA170AH units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA170AH, 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 P4SMA170AH part is unused and in its original packaging.
Return procedure for P4SMA170AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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