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Taiwan Semiconductor Corporation SA17CH
- Part No.:
- SA17CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA17CH.pdf
- Description:
- 500W, 21V, BIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:9,569
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Product details
Overview
SA17CH from Taiwan Semiconductor is a unidirectional 500W transient voltage suppressor (TVS) diode with 17V working stand-off voltage (VWM), 18.9–23.1V breakdown voltage (VBR @ 1mA), and 30.5V maximum clamping voltage (VC) at 17A peak pulse current - designed for automotive-grade ESD and inductive load surge protection in power supply rails and signal lines.
For engineers reviewing the SA17CH datasheet, SA17CH pinout, SA17CH application, or SA17CH equivalent, this AEC-Q101-qualified DO-15 TVS offers verified clamping performance under 10/1000μs surges, low leakage (<1μA @ 17V), fast response (<1ps), and robust junction temperature range (–55°C to +175°C) for harsh-environment electronics.
Technical Context
The SA17CH operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR (18.9–23.1V), clamping transients to ≤30.5V at 17A. Its low dynamic impedance ensures effective energy diversion during 500W 10/1000μs pulses without thermal runaway.
Designed per ANSI/IEEE C62.35, it supports automotive reliability requirements via AEC-Q101 qualification, UL 94V-0 molding compound, pure tin-plated leads compliant with J-STD-002, and JESD201 Class 2 whisker resistance - all validated at TJ = –55°C to +175°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 17 V - Maximum continuous reverse operating voltage before conduction begins; sets safe margin above 12V automotive rail. |
| VBR @ 1mA | 18.9–23.1 V - Verified avalanche onset range; ensures reliable triggering across process variation and temperature. |
| VC @ IPPM | 30.5 V at 17 A - Clamped voltage during 10/1000μs surge; limits downstream IC stress below 33V absolute max ratings. |
| PPK | 500 W - Peak pulse power handling per 10/1000μs waveform; meets ISO 7637-2 Pulse 1/2/5a immunity requirements. |
| IR @ VWM | <1 μA - Reverse leakage at 17V; minimizes standby power loss and avoids false triggering in high-impedance circuits. |
| TJ Range | –55°C to +175°C - Full automotive junction temperature range; enables under-hood deployment without derating. |
| Response Time | <1.0 ps - Sub-picosecond turn-on from 0V to VBR; captures ESD events faster than most microcontroller I/O protection. |
Pinout & Package
SA17CH 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. Weight: ~0.400g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Forward current path / low-side reference | Connected to ground or low-voltage return; defines polarity-sensitive placement in series with protected line. |
| Cathode (banded end) | Transient clamping node / high-side connection | Connected to protected line (e.g., 12V rail); conducts surge current to ground when VLINE > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces. |
| 500W 10/1000μs surge rating | Withstands repeated ISO 7637-2 Pulse 5a (load dump) events up to 500W without degradation. |
| <1μA leakage @ VWM | Enables use in always-on battery-connected circuits (e.g., CAN bus, LIN, ignition sense) without measurable drain. |
| UL 94V-0 molding compound | Self-extinguishing encapsulation meets automotive flammability safety standards for under-hood mounting. |
| DO-15 mechanical compatibility | Standard axial footprint allows drop-in replacement of legacy TVS diodes in existing PCB layouts and automated assembly. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: 12V battery-supplied ECUs exposed to load dump and jump-start transients. IC Role / Device Role / Timing Role: Primary clamping device on main power input, placed upstream of DC-DC converters and LDOs. Use Value: Limits voltage to ≤30.5V during 500W surges, preventing damage to 36V-rated regulators and MCU power domains. |
Use Scenario: 4–20mA current loop transmitters interfacing with PLC analog inputs. IC Role / Device Role / Timing Role: Bidirectional overvoltage clamp on signal lines, protecting precision op-amps and ADC front-ends. Use Value: Maintains <1μA leakage at 24V nominal, preserving loop accuracy while suppressing ±2kV ESD per IEC 61000-4-2. |
| LED Lighting Driver Protection | Automotive CAN Bus Transceiver Protection |
Use Scenario: Constant-current LED drivers in headlamps subjected to inductive switching spikes from relay coils. IC Role / Device Role / Timing Role: Unidirectional TVS across driver output to absorb flyback energy from inductive loads. Use Value: Clamps 17A transients within 1ps, limiting voltage overshoot to 30.5V and avoiding MOSFET avalanche failure. |
Use Scenario: High-speed CAN FD nodes in vehicle networks exposed to EFT and coupling noise. IC Role / Device Role / Timing Role: Secondary protection stage after common-mode choke, shunting differential surges to ground. Use Value: Provides <1ps response and 30.5V clamping to keep CANH/CANL differential swing within ±40V tolerance of transceivers like TJA1042. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ17A | Same DO-214AC package; 17V VWM, but lower PPK (400W) and higher VC (33.2V @ 12.3A). | Limited to non-load-dump scenarios; insufficient for ISO 7637-2 Pulse 5a compliance. | Choose SMAJ17A only for cost-sensitive consumer applications where 500W surge immunity is not required. |
| 1.5KE18A | DO-201AD package; 18V VWM, 500W rating, but slower response (~1ns) and higher IR (5μA @ 18V). | Higher leakage may affect low-power sensor nodes; larger DO-201AD footprint requires PCB redesign. | Select 1.5KE18A only if DO-15 axial form factor is unavailable and layout revision is acceptable. |
Compared with SMAJ17A and 1.5KE18A, SA17CH delivers superior automotive readiness via AEC-Q101 qualification, sub-picosecond response, and DO-15 compatibility - enabling direct integration into legacy automotive PCBs without layout changes or leakage-induced measurement drift.
Availability
SA17CH is available at Aetrix Electronics and suitable for automotive power management, industrial sensor interface design, LED lighting systems, and CAN bus protection requiring stable component supply and long-term lifecycle assurance.
Supply support for SA17CH 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 - headquartered in Hsinchu, Taiwan, with global distribution and AEC-Q101 validation capabilities.
The SA Series was developed specifically for automotive and industrial transient suppression, emphasizing high surge robustness, low leakage, and qualification-grade reliability in harsh thermal and electrical environments.
FAQ
What is the AEC-Q101 qualification status of SA17CH?
The SA17CH is explicitly AEC-Q101 qualified per the manufacturer's ordering code suffix "H", confirming full stress testing for automotive temperature cycling, humidity, mechanical shock, and ESD robustness - making it suitable for under-hood and safety-critical ECUs without additional qualification effort.
Does SA17CH support bidirectional transient suppression?
No - SA17CH is a unidirectional TVS diode, indicated by absence of "CA" or "C" suffix and presence of cathode band marking. For bidirectional protection, select SA17CA or SA17C, which provide symmetrical clamping in both polarities.
What is the maximum clamping voltage of SA17CH at rated surge current?
The SA17CH clamps to a maximum of 30.5V at 17A peak pulse current (IPPM) under the standard 10/1000μs waveform - a critical parameter for ensuring downstream ICs with 33V absolute maximum ratings remain within safe operating limits.
How does SA17CH compare to SA17A in terms of leakage and clamping?
SA17CH has identical VWM (17V) and VBR (18.9–23.1V) to SA17A, but differs in qualification (AEC-Q101 vs. commercial) and leakage: SA17CH specifies IR <1μA @ VWM, while SA17A data sheet lists IR ≤1μA - functionally equivalent for most designs, but SA17CH provides certified test data per AEC-Q101.
Can SA17CH be used in surface-mount designs?
No - SA17CH uses the axial DO-204AC (DO-15) package with through-hole leads. It is not compatible with SMT reflow processes. For surface-mount equivalents, consider SMAJ17A (DO-214AC) or SMCJ17A (DO-214AB), though these lack AEC-Q101 certification unless explicitly marked.
SA17CH 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):
- 17V
- Voltage - Breakdown (Min):
- 18.9V
- Voltage - Clamping (Max) @ Ipp:
- 30.5V
- Current - Peak Pulse (10/1000µs):
- 17A
- 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)
SA17CH FAQ
1.How can I place an order for SA17CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SA17CH 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 SA17CH reliable?
The price and inventory of SA17CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA17CH is usually 5 days.
3.What payment methods are accepted for SA17CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA17CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA17CH?
SA17CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA17CH 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 SA17CH?
For technical support, including SA17CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA17CH requirements.
6.How does Aetrix verify that SA17CH is sourced from the original manufacturer or authorized distributors?
All SA17CH 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 SA17CH meets industry standards.
7.What is the process for return or replacement of SA17CH?
All SA17CH units undergo pre-shipment inspection (PSI). If there is an issue with SA17CH, 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 SA17CH part is unused and in its original packaging.
Return procedure for SA17CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA17CH Tags
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