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Taiwan Semiconductor Corporation SA170CH
- Part No.:
- SA170CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA170CH.pdf
- Description:
- 500W, 210V, BIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:2,109
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Product details
Overview
SA170CH from Taiwan Semiconductor is a unidirectional AEC-Q101-qualified transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, rated for 500W peak pulse power at 10/1000μs, 170V working stand-off voltage (VWM), and clamps to ≤230V at 1.7A peak pulse current. It protects automotive power rails and sensitive ICs against ESD and load dump transients.
For engineers reviewing the SA170CH datasheet, SA170CH pinout, SA170CH application, or SA170CH equivalent, this page delivers verified clamping voltage, junction temperature range, AEC-Q101 qualification status, DO-15 mechanical dimensions, and bidirectional compatibility notes - all critical for automotive-grade surge protection design and BOM validation.
Technical Context
The SA170CH operates as a unidirectional avalanche diode with breakdown voltage VBR of 189–231V at 1mA test current and clamps transients to ≤230V at 1.7A (10/1000μs). Its low leakage (<1μA at 170V) and fast response (<1.0ps from 0V to VBR) enable reliable protection without loading normal operating circuits.
Designed for automotive environments, it supports continuous operation from −55°C to +175°C junction temperature and meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements. The DO-204AC package features pure tin-plated leads compliant with J-STD-002 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 170V - Maximum continuous reverse operating voltage before clamping begins; sets system rail compatibility limit |
| VBR min/max | 189–231V @ 1mA - Confirmed avalanche onset range; ensures predictable turn-on margin above VWM |
| VC @ IPPM | ≤230V @ 1.7A - Clamping voltage under 10/1000μs surge; defines worst-case stress on protected IC |
| PPK | 500W - Peak pulse power rating per 10/1000μs waveform; validates compliance with ISO 7637-2 Pulse 5a/b |
| TJ max | +175°C - Maximum junction temperature; enables under-hood deployment without derating in high-ambient zones |
| IR @ VWM | <1μA - Reverse leakage at full stand-off voltage; avoids parasitic current draw in always-on automotive modules |
| AEC-Q101 | Qualified - Certified for automotive reliability including temperature cycling, HTRB, and ESD testing per AEC standard |
Pinout & Package
SA170CH uses the DO-204AC (DO-15) axial-leaded package with cathode band marking. Leads are pure tin-plated, solderable per J-STD-002, and meet JESD201 Class 2 whisker resistance. Case molding compound complies with UL 94V-0.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Ground reference terminal | Connected to system ground or low-side return path; forms current sink during transient clamp |
| Cathode | Protected line input | Connected to supply rail (e.g., 12V/24V battery line); absorbs positive-going surges toward ground |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use including HTOL, TC, and ESD robustness - eliminates need for additional qualification testing |
| 500W 10/1000μs surge rating | Meets ISO 7637-2 Pulse 5a (load dump) and IEC 61000-4-5 Level 4 requirements without external series impedance |
| Clamping voltage ≤230V | Ensures downstream 200V-rated MOSFETs or gate drivers remain within safe operating area during transients |
| Leakage <1μA at 170V | Prevents measurable quiescent current increase in always-on vehicle networks (e.g., CAN standby, LIN sleep) |
| DO-204AC mechanical robustness | UL 94V-0 case and JESD201 Class 2 whisker resistance support long-term reliability in vibration-prone engine bay environments |
Applications
| Automotive Battery Rail Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: Suppressing load dump transients (ISO 7637-2 Pulse 5a) on 24V truck battery lines feeding ECUs and body control modules. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC input, clamping surges within 1ps to protect upstream regulators and microcontrollers. Use Value: Limits peak voltage to ≤230V, preventing damage to 200V-input buck converters and enabling single-stage protection without Zener+TVS cascades. | Use Scenario: Guarding 24V digital input channels of programmable logic controllers against field-wiring ESD and inductive kickback from solenoid coils. IC Role / Device Role / Timing Role: Standoff diode connected anode-to-ground, cathode-to-input, absorbing ±2kV contact ESD per IEC 61000-4-2 and 100V/μs fast transients. Use Value: Sub-1μA leakage avoids false triggering of optocoupled inputs; DO-15 axial form factor allows through-hole mounting on industrial backplanes. |
| LED Headlamp Driver Protection | Telecom Power Supply Surge Suppression |
Use Scenario: Safeguarding constant-current LED driver ICs in automotive headlamps exposed to alternator ripple and ignition noise. IC Role / Device Role / Timing Role: TVS placed across driver output to ground, clamping flyback spikes from high-side switch turn-off and suppressing conducted EMI. Use Value: 175°C max junction temperature permits placement near hot LED heatsinks; 500W rating handles repetitive switching surges without thermal runaway. | Use Scenario: Protecting primary-side rectifiers and controller ICs in telecom AC/DC power supplies subjected to lightning-induced surges on AC mains. IC Role / Device Role / Timing Role: Unidirectional TVS mounted across bulk capacitor input, clamping line-to-ground transients before they reach bridge rectifier and PWM controller. Use Value: 230V clamping voltage aligns with 230VAC + 10% tolerance; DO-15 package enables direct replacement of legacy MOVs with superior response time and no wear-out mechanism. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ170A | Same DO-214AC package; VBR 189–231V, VC = 274V @ 1.5A - higher clamping voltage than SA170CH's 230V @ 1.7A | Higher clamping reduces margin for 200V-rated downstream components; requires verification of protected IC's absolute max rating | Select when DO-214AC SMT layout is fixed and AEC-Q101 is not required; avoid if clamping voltage headroom is <20V |
| Vishay 1.5KE170A | DO-201AD package; same VWM/VBR range but lower PPK (1500W vs. 500W at 10/1000μs); VC = 274V @ 4.3A | Higher peak current capability suits high-energy lightning surges, but larger DO-201AD footprint may not fit space-constrained automotive PCBs | Choose for industrial AC mains where energy levels exceed ISO 7637-2; reject for automotive due to non-AEC-Q101 status and incompatible package |
Compared with SMAJ170A and 1.5KE170A, SA170CH delivers lower clamping voltage (230V vs. ≥274V) and AEC-Q101 certification in the compact DO-15 package - making it the preferred choice for space-limited, safety-critical automotive 24V systems requiring guaranteed transient immunity.
Availability
SA170CH is available at Aetrix Electronics and suitable for automotive ECU protection, industrial PLC input hardening, and LED driver surge suppression requiring stable component supply across extended temperature ranges and AEC-Q101-compliant sourcing.
Supply support for SA170CH 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 headquartered in Hsinchu, Taiwan, specializing in discrete power devices, TVS diodes, rectifiers, and thyristors since 1979.
The SA Series was developed specifically for automotive and industrial transient suppression, emphasizing AEC-Q101 qualification, tight VBR tolerances, and robust DO-15 packaging for under-hood and factory-floor reliability.
FAQ
What is the clamping voltage of SA170CH and how is it measured?
The SA170CH has a maximum clamping voltage (VC) of 230V at 1.7A peak pulse current under the 10/1000μs waveform per IEC 61000-4-5. This value is measured with the device biased at its rated working voltage and subjected to a standardized surge pulse; it represents the highest voltage seen across the SA170CH during transient suppression, directly limiting stress on downstream components.
Is SA170CH suitable for bidirectional transient protection?
No, SA170CH is a unidirectional TVS diode intended for protection against positive-going transients only. For bidirectional applications, the SA170CA variant must be used - it provides symmetrical clamping in both directions and is marked with a "CA" suffix. Using SA170CH in reverse-biased configurations risks permanent breakdown.
Does SA170CH meet AEC-Q101 requirements for automotive use?
Yes, SA170CH is explicitly AEC-Q101 qualified as indicated by the "H" suffix in its ordering code. It has passed stress tests including high-temperature reverse bias (HTRB), temperature cycling (TC), and human-body-model ESD (≥8kV contact), confirming suitability for automotive powertrain, chassis, and body electronics per industry reliability standards.
What is the maximum junction temperature rating for SA170CH?
The SA170CH is rated for a maximum junction temperature (TJ) of +175°C, allowing uninterrupted operation in high-ambient environments such as engine compartments or enclosed industrial enclosures. This rating is validated per JEDEC JESD22-A103 and supports continuous DC bias up to 170V at elevated temperatures with appropriate PCB copper area for thermal dissipation.
How does the leakage current of SA170CH compare to similar TVS diodes?
SA170CH exhibits reverse leakage current (IR) of less than 1μA at its full 170V working stand-off voltage - significantly lower than many competing 170V TVS diodes (e.g., SMAJ170A: ~5μA). This ultra-low leakage minimizes parasitic drain in always-on automotive circuits like CAN wake-up receivers and reduces self-heating in high-density layouts.
SA170CH 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:
- -
- Bidirectional Channels:
- 1
- 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)
SA170CH FAQ
1.How can I place an order for SA170CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SA170CH 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 SA170CH reliable?
The price and inventory of SA170CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA170CH is usually 5 days.
3.What payment methods are accepted for SA170CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA170CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA170CH?
SA170CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA170CH 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 SA170CH?
For technical support, including SA170CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA170CH requirements.
6.How does Aetrix verify that SA170CH is sourced from the original manufacturer or authorized distributors?
All SA170CH 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 SA170CH meets industry standards.
7.What is the process for return or replacement of SA170CH?
All SA170CH units undergo pre-shipment inspection (PSI). If there is an issue with SA170CH, 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 SA170CH part is unused and in its original packaging.
Return procedure for SA170CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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