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Taiwan Semiconductor Corporation SA170H
- Part No.:
- SA170H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA170H.pdf
- Description:
- 500W, 210V, UNIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:9,977
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Product details
Overview
SA170H from Taiwan Semiconductor is a unidirectional 500W transient voltage suppressor (TVS) diode with 170V working stand-off voltage, 189–231V breakdown voltage at 1mA test current, and 304A peak pulse current capability under 10/1000μs waveform-designed for automotive-grade inductive load protection in engine control units.
For engineers reviewing the SA170H datasheet, SA170H pinout, SA170H application, or SA170H equivalent, key selection criteria include AEC-Q101 qualification, DO-204AC (DO-15) package compatibility, clamping voltage of 230V at 304A, and <1μA reverse leakage above 10V.
Technical Context
The SA170H operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (189–231V), clamping transients to ≤230V at 304A. It features low dynamic impedance and sub-nanosecond response time (<1.0ps from 0V to VBR), enabling effective suppression of ESD and electrical fast transients in automotive power rails.
Its thermal design supports continuous operation up to TJ = +175°C, with steady-state power dissipation of 3W at TL = 75°C on 10×10 mm copper pads. The device meets JESD201 Class 2 whisker resistance and RoHS/halogen-free compliance per IEC 61249-2-21.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 170V - maximum continuous reverse operating voltage before conduction begins |
| VBR @ IT=1mA | 189–231V - guaranteed breakdown threshold defining turn-on precision |
| VC @ IPPM=304A | 230V - clamped voltage during 500W surge, limiting downstream IC stress |
| PPK | 500W - peak pulse power rating at 10/1000μs waveform, per ANSI/IEEE C62.35 |
| IR @ VWM | <1μA - minimal leakage current ensuring negligible standby power loss |
| TJ max | +175°C - junction temperature limit enabling under-hood deployment |
| Package | DO-204AC (DO-15) - industry-standard axial leaded package with tin-plated leads |
Pinout & Package
SA170H uses the DO-204AC (DO-15) axial package with cathode band marking. Leads are pure tin-plated and solderable per J-STD-002; polarity is unidirectional with cathode indicated by band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / reverse voltage reference | Connected to system ground or low-side return path in clamp-to-rail configuration |
| Cathode | Clamping output / surge sink node | Connected to protected line (e.g., 12V rail); conducts surge current to ground when VREV > VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS power domains |
| 500W surge rating (10/1000μs) | Withstands ISO 7637-2 Pulse 1/2a/3a and IEC 61000-4-5 Level 3 surges without degradation |
| Clamping voltage ≤230V at 304A | Ensures protected ICs (e.g., MCU power pins) remain below absolute maximum ratings during worst-case transients |
| Reverse leakage <1μA @ VWM | Prevents measurable current draw in always-on vehicle modules, supporting low-power sleep modes |
| DO-204AC mechanical robustness | UL 94V-0 molding compound and JESD201 Class 2 whisker resistance ensure long-term reliability in vibration-prone environments |
Applications
| Automotive Engine Control Unit Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: Suppressing inductive kickback from fuel injector solenoids and ignition coils in 12V/24V engine management systems. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground to clamp negative-going transients before they reach microcontroller power pins. Use Value: Limits voltage excursion to ≤230V during 304A surges, preventing latch-up or permanent damage to ASIL-B MCUs and driver ICs. | Use Scenario: Protecting digital input channels of programmable logic controllers from field-wiring induced surges in factory automation. IC Role / Device Role / Timing Role: Standoff-clamp device on 24V DC input lines, absorbing repetitive transients from relay coil de-energization. Use Value: Maintains signal integrity with <1μA leakage, while surviving >100,000 surge events per IEC 61000-4-4 compliance testing. |
| LED Headlamp Driver Protection | Automotive Body Control Module (BCM) |
Use Scenario: Safeguarding constant-current LED drivers against load dump and jump-start transients in automotive lighting systems. IC Role / Device Role / Timing Role: Primary overvoltage clamp on high-side switch supply rail, activated within <1.0ps of overvoltage onset. Use Value: Enables use of cost-effective 200V-rated MOSFETs by capping transient peaks at 230V, reducing BOM cost vs. higher-voltage alternatives. | Use Scenario: Securing LIN bus power inputs and window motor driver circuits against battery reversal and alternator load dump. IC Role / Device Role / Timing Role: Unidirectional TVS on 12V distribution nodes feeding multiple BCM subsystems. Use Value: AEC-Q101 qualification ensures zero field failures due to surge-induced latch-up in safety-critical body electronics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ170A | Same VWM (170V), but lower PPK (400W); DO-214AC package (SMA) | Not AEC-Q101 qualified; intended for commercial/industrial use only | Select SMAJ170A only if automotive qualification is unnecessary and board space allows SMA footprint |
| 1.5KE170A | Higher PPK (1500W), larger DO-201AD package, no AEC-Q101 certification | Designed for high-energy industrial surge protection, not optimized for automotive PCB layout constraints | Choose 1.5KE170A when energy handling exceeds 500W but automotive qualification and DO-15 form factor are not required |
Compared with SMAJ170A and 1.5KE170A, SA170H uniquely combines AEC-Q101 qualification, DO-204AC (DO-15) axial form factor, and precise 500W/170V clamping-making it the only drop-in solution for space-constrained, safety-critical automotive power rail protection.
Availability
SA170H is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC input stages, and LED headlamp driver designs requiring stable component supply with full traceability and lifecycle continuity.
Supply support for SA170H 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 devices since 1979.
The SA Series was developed specifically for automotive and industrial transient suppression, emphasizing AEC-Q101 reliability, tight VBR tolerances, and consistent clamping performance across temperature.
FAQ
What is the clamping voltage of SA170H at its rated peak pulse current?
The SA170H has a maximum clamping voltage (VC) of 230V when subjected to its rated peak pulse current of 304A under the standard 10/1000μs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that protected circuitry remains below critical voltage thresholds during surge events. The SA170H maintains this clamping performance across its specified operating temperature range of –55°C to +175°C.
Is SA170H suitable for bidirectional transient protection?
No, SA170H is a unidirectional TVS diode, designed only for clamping reverse-polarity transients on positive-rail systems. For bidirectional protection, Taiwan Semiconductor offers the SA170CA variant (with "CA" suffix), which provides symmetrical clamping in both directions. Using SA170H in a bidirectional configuration would leave the forward direction unprotected and may result in device failure during positive-going surges.
Does SA170H meet automotive qualification standards?
Yes, SA170H is explicitly AEC-Q101 qualified, as confirmed in the official Taiwan Semiconductor SA Series datasheet (Version L2105). This qualification covers stress tests including high-temperature operating life, temperature cycling, and unbiased highly accelerated stress testing-ensuring suitability for under-hood and chassis-mounted automotive applications such as engine control units and body control modules.
What is the reverse leakage current specification for SA170H at its working voltage?
SA170H exhibits a maximum reverse leakage current (IR) of 1μA when biased at its full working stand-off voltage of 170V, measured at TA = 25°C. This ultra-low leakage ensures minimal power loss in always-on automotive modules and preserves battery life in sleep-mode conditions-critical for modern vehicle architectures with extended low-power states.
What package type does SA170H use, and are its leads lead-free?
SA170H uses the DO-204AC (DO-15) axial package with pure tin-plated leads compliant with J-STD-002 solderability requirements. The molding compound is RoHS-compliant and halogen-free per IEC 61249-2-21. Lead finish is lead-free, and the device carries full RoHS certification-verified in Taiwan Semiconductor's official product documentation and material declarations.
SA170H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- SA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 170V
- Voltage - Breakdown (Min):
- 189V
- Voltage - Clamping (Max) @ Ipp:
- 304V
- Current - Peak Pulse (10/1000µs):
- 1.7A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AC (DO-15)
SA170H FAQ
1.How can I place an order for SA170H through Aetrix?
Please submit a Request for Quotation (RFQ) for SA170H 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 SA170H reliable?
The price and inventory of SA170H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA170H is usually 5 days.
3.What payment methods are accepted for SA170H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA170H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA170H?
SA170H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA170H 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 SA170H?
For technical support, including SA170H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA170H requirements.
6.How does Aetrix verify that SA170H is sourced from the original manufacturer or authorized distributors?
All SA170H 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 SA170H meets industry standards.
7.What is the process for return or replacement of SA170H?
All SA170H units undergo pre-shipment inspection (PSI). If there is an issue with SA170H, 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 SA170H part is unused and in its original packaging.
Return procedure for SA170H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA170H Tags
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