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Taiwan Semiconductor Corporation SA17
- Part No.:
- SA17
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA17.pdf
- Description:
- 500W, 21V, UNIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:3,057
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Product details
Overview
SA17 from Taiwan Semiconductor is a unidirectional 500W transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, with 17V working stand-off voltage (VWM), 18.9–23.1V breakdown voltage (VBR @ 1mA), and 30.5V clamping voltage (VC) at 17A peak pulse current. It delivers fast response (<1.0ps), low leakage (<1μA @ 17V), and AEC-Q101 qualification for automotive-grade surge protection in power supply rails and I/O interfaces.
For engineers reviewing the SA17 datasheet, SA17 pinout, SA17 application, or SA17 equivalent, key selection criteria include its 17V VWM compatibility with 15V logic/system rails, 30.5V VC clamping margin relative to 24V system tolerance, unidirectional polarity marking, and DO-15 through-hole mounting for high-reliability industrial control and automotive ECU designs.
Technical Context
The SA17 operates as a silicon avalanche diode, triggered when reverse voltage exceeds its specified VBR range (18.9–23.1V at 1mA test current). Its clamping action limits transient energy to ≤30.5V at 17A (10/1000μs waveform), enabling robust protection of downstream 24V-rated ICs and sensors.
Designed for unidirectional operation only, it features a cathode band marking, exhibits <1μA reverse leakage at 17V, and maintains stable performance across –55°C to +175°C junction temperature range - critical for under-hood automotive and industrial motor drive applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 17 V - Maximum continuous DC or RMS voltage the device blocks without conduction; matches 15V nominal systems with 13% margin. |
| VBR min/max | 18.9 / 23.1 V @ 1 mA - Breakdown occurs within this range; ensures reliable triggering above VWM while avoiding false trips. |
| VC @ IPPM | 30.5 V @ 17 A - Clamped voltage during 10/1000μs surge; stays below 33V absolute max rating of common 24V logic ICs. |
| PPK | 500 W - Peak pulse power handling per single non-repetitive event; sufficient for ISO 7637-2 Pulse 1/2a/5a transients. |
| IR @ VWM | <1 μA - Negligible leakage at operating voltage; avoids signal integrity degradation or battery drain in always-on circuits. |
| TJ max | +175 °C - Enables placement near heat sources (e.g., power MOSFETs, inductors) without derating concerns. |
| Package | DO-204AC (DO-15) - Industry-standard axial-leaded package with 0.400g mass; compatible with legacy wave-solder and hand-solder processes. |
Pinout & Package
DO-204AC (DO-15) package: axial-leaded, molded epoxy case meeting UL 94V-0; cathode indicated by band on body; pure tin-plated leads compliant with J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-impedance return path; completes clamping loop during transient events. |
| Cathode | High-side connection point | Connected to protected line (e.g., 24V rail); polarity marking ensures correct orientation to avoid forward conduction failure. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood use per stress test requirements including temperature cycling, HTRB, and ESD. |
| Clamping voltage ≤30.5V | Provides ≥3.5V margin below 33V absolute maximum rating of typical 24V microcontrollers and CAN transceivers. |
| Response time <1.0ps | Engages before most semiconductor junctions experience avalanche damage - critical for protecting high-speed data lines. |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive; supports green manufacturing and end-of-life recycling. |
| 175°C max junction temp | Enables direct placement on PCBs adjacent to power components without thermal derating penalties. |
Applications
| Automotive Power Rail Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 24V supply inputs of engine control units (ECUs) against load dump and inductive switching transients per ISO 7637-2. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between 24V rail and chassis ground to shunt surge energy away from PMICs and MCU power pins. Use Value: With 30.5V clamping and 500W rating, SA17 prevents overvoltage damage during 12V/24V system load dump events up to 35V/100ms. | Use Scenario: Safeguarding digital input channels of programmable logic controllers exposed to field wiring surges in factory automation. IC Role / Device Role / Timing Role: Standoff protector on 24V dry-contact inputs, absorbing EFT bursts (IEC 61000-4-4) and lightning-induced ring waves. Use Value: Sub-1μA leakage avoids false triggering of optocoupler-based inputs; DO-15 form factor enables easy retrofit into existing DIN-rail mounted PCB layouts. |
| LED Driver Output Protection | DC Motor Control Feedback Line Protection |
Use Scenario: Shielding constant-current LED driver outputs from back-EMF spikes generated during hot-plug or short-circuit events. IC Role / Device Role / Timing Role: Unidirectional TVS connected anode-to-ground, cathode-to-output, clamping flyback voltage spikes before they reach driver IC output stage. Use Value: 17V VWM aligns with typical 12–15V LED string forward voltage; 30.5V VC ensures driver ICs rated for 36V abs max remain within safe operating area. | Use Scenario: Securing hall-effect sensor feedback lines in brushed DC motor controllers subjected to commutation noise and brush arcing. IC Role / Device Role / Timing Role: Low-capacitance TVS on low-voltage analog feedback path (e.g., 5V or 3.3V), suppressing sub-10ns transients without distorting signal integrity. Use Value: <1μA leakage preserves sensor bias accuracy; fast <1.0ps response prevents latch-up in precision ADC front-ends monitoring motor position. |
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 VWM (17V), but bidirectional; higher VC (33.2V @ 15.3A); SMA package (SMT). | Requires PCB redesign for surface-mount; suitable where bidirectional protection or space constraints demand SMT. | Select SMAJ17A only if bidirectional clamping is required or board real estate prohibits DO-15 through-hole placement. |
| P6SMB17A | Same VWM (17V), bidirectional; identical VC (33.2V @ 15.3A); SMB package (SMT); 600W PPK rating. | Higher surge rating but incompatible polarity and mounting; not drop-in for unidirectional SA17 use cases. | Choose P6SMB17A only for new SMT designs needing >500W margin and bidirectional capability - not a replacement for SA17's unidirectional DO-15 role. |
Compared with SMAJ17A and P6SMB17A, the SA17 offers unidirectional polarity, through-hole DO-15 mounting, and optimized 30.5V clamping for 24V rail protection - making it uniquely suited for legacy automotive and industrial control boards where mechanical robustness and polarity-specific clamping are mandatory.
Availability
SA17 is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, LED drivers, and DC motor controllers requiring stable component supply with AEC-Q101 qualification and long-term manufacturability.
Supply support for SA17 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 Taiwanese semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for automotive, industrial, and consumer markets.
The SA Series was developed specifically for high-reliability transient suppression in harsh environments - emphasizing low clamping voltage, AEC-Q101 compliance, and robust DO-15 packaging for under-hood and factory-floor deployment.
FAQ
What is the breakdown voltage range of the SA17?
The SA17 has a minimum breakdown voltage (VBR) of 18.9 V and a maximum of 23.1 V, measured at 1 mA test current per ANSI/IEEE C62.35. This range ensures consistent triggering above its 17 V working stand-off voltage while accommodating process variation - critical for predictable clamping behavior in 24V automotive and industrial systems where SA17 is deployed.
Is the SA17 suitable for bidirectional transient protection?
No, the SA17 is a unidirectional TVS diode, designed for protection against positive-going transients on DC lines referenced to ground. Its cathode-band marking indicates polarity-sensitive installation. For bidirectional applications (e.g., AC lines or data buses), SA17A or other CA-suffix variants must be used - the SA17 itself does not conduct symmetrically and will fail if reverse-biased beyond its VWM.
What is the maximum clamping voltage of the SA17 during a surge event?
The SA17 clamps to a maximum of 30.5 V when subjected to a 17 A peak pulse current (10/1000 μs waveform). This value is guaranteed per datasheet testing and defines the upper voltage limit imposed on protected circuitry during transient events - ensuring compatibility with 33 V absolute maximum rated components commonly found in 24 V system designs using SA17.
Does the SA17 meet automotive reliability standards?
Yes, the SA17 is AEC-Q101 qualified, having passed stress tests including high-temperature reverse bias (HTRB), temperature cycling, and electrostatic discharge (ESD) per JESD22. This certification confirms its suitability for automotive under-hood applications such as engine control modules and body electronics where SA17 provides surge immunity per ISO 7637-2.
What package type does the SA17 use, and is it lead-free?
The SA17 uses the DO-204AC (DO-15) axial-leaded package with pure tin-plated leads compliant with J-STD-002 solderability and RoHS Directive 2011/65/EU. The molding compound is halogen-free per IEC 61249-2-21, and the device carries no lead content - fully satisfying environmental compliance requirements for SA17 in global industrial and automotive production.
SA17 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):
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AC (DO-15)
SA17 FAQ
1.How can I place an order for SA17 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA17 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 SA17 reliable?
The price and inventory of SA17 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA17 is usually 5 days.
3.What payment methods are accepted for SA17?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA17 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA17?
SA17 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA17 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 SA17?
For technical support, including SA17 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA17 requirements.
6.How does Aetrix verify that SA17 is sourced from the original manufacturer or authorized distributors?
All SA17 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 SA17 meets industry standards.
7.What is the process for return or replacement of SA17?
All SA17 units undergo pre-shipment inspection (PSI). If there is an issue with SA17, 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 SA17 part is unused and in its original packaging.
Return procedure for SA17:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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