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Taiwan Semiconductor Corporation SA17A
- Part No.:
- SA17A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA17A.pdf
- Description:
- TVS DIODE 17VWM 27.7VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,502
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Product details
Overview
SA17A from Taiwan Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, rated for 500W peak pulse power at 10/1000μs, with 17V working stand-off voltage (VWM), 18.9–20.9V breakdown voltage (VBR), and 27.7V clamping voltage (VC) at 19A peak pulse current-designed for automotive and industrial ESD and inductive load protection.
For engineers reviewing the SA17A datasheet, SA17A pinout, SA17A application, or SA17A equivalent, this page delivers verified electrical parameters, polarity-aware package details, AEC-Q101 qualification status, clamping performance under standardized surge waveforms, and direct alternative part comparisons for robust circuit protection design.
Technical Context
The SA17A operates as a unidirectional avalanche diode, triggering conduction when reverse voltage exceeds its specified VBR range (18.9–20.9V at 1mA test current), limiting transient energy via low-impedance clamping to ≤27.7V at 19A. Its fast response time (<1.0ps from 0V to VBR) ensures protection of downstream ICs against ESD and fast transients.
Designed for single-polarity surge suppression, it features <1μA reverse leakage at 17V (VWM), 175°C maximum junction temperature, and RoHS/halogen-free compliance. It is not rated for bidirectional use-no "C" or "CA" suffix-and requires correct cathode-band orientation during PCB placement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 17 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR @ IT=1mA | 18.9–20.9 V - Breakdown voltage range defining reliable avalanche onset threshold |
| VC @ IPPM=19A | 27.7 V - Clamped voltage during 10/1000μs surge, limiting stress on protected ICs |
| PPK | 500 W - Peak pulse power handling per IEC 61000-4-5 standard waveform |
| IR @ VWM | <1 μA - Negligible leakage current at stand-off voltage, minimizing standby power loss |
| TJ max | +175 °C - Enables operation in under-hood automotive and high-temperature industrial environments |
| Package | DO-204AC (DO-15) - Industry-standard axial leaded package with tin-plated leads, UL 94V-0 molding |
Pinout & Package
DO-204AC (DO-15) package with axial leads: Cathode indicated by a band-marked end; anode is unmarked lead. Leads are pure tin-plated, solderable per J-STD-002, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Surge current sink node | Connected to protected line (e.g., CAN_H, power rail); conducts avalanche current to ground during overvoltage |
| Anode (unmarked end) | Reference/ground return | Typically tied to system ground or low-impedance return path; completes clamping loop during transient events |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified (H-grade variant) | Validated for automotive applications including engine control, body electronics, and infotainment power rails |
| 500W 10/1000μs surge rating | Withstands IEC 61000-4-5 Level 4 surges (4kV) without degradation when properly heatsinked |
| <1.0ps response time (unidirectional) | Engages before most microsecond-scale transients fully develop, protecting sensitive gate drivers and MCU I/O |
| RoHS + halogen-free (IEC 61249-2-21) | Complies with automotive ELV and consumer electronics environmental directives without compromising thermal performance |
| 175°C junction temperature rating | Supports placement near heat sources (e.g., power converters, motor drivers) without derating concerns |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12V battery-supplied ECUs from load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and GND, clamping spikes above 17V before they reach PMIC or MCU inputs. Use Value: Limits transient voltage to ≤27.7V at 19A, preventing latch-up or oxide breakdown in 3.3V/5V logic powered from buck-regulated rails. | Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD events during connector mating/unmating. IC Role / Device Role / Timing Role: TVS installed at connector entry point, shunting human-body-model (HBM) ESD pulses to ground before reaching op-amp input stages. Use Value: Sub-nanosecond response ensures clamping occurs within first 100ps of ESD strike, preserving signal integrity and ADC accuracy. |
| Motor Drive Flyback Suppression | Lighting System Surge Immunity |
Use Scenario: Suppressing inductive kickback from brushed DC motors or solenoids switched by N-channel MOSFETs. IC Role / Device Role / Timing Role: Placed across motor terminals or MOSFET drain-source, conducting flyback energy into bulk capacitance or ground. Use Value: 500W peak power rating absorbs repetitive 100–500mJ flyback pulses without thermal runaway or parameter shift. | Use Scenario: Hardening LED driver inputs against lightning-induced surges in outdoor street lighting systems. IC Role / Device Role / Timing Role: Front-end TVS on AC/DC input stage, clamping line-to-ground transients before rectification and PFC stage. Use Value: 27.7V clamping voltage ensures downstream bridge rectifier and controller ICs remain within safe SOA limits during 6kV surge tests. |
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 SMAJ17A | Same DO-204AC package, identical VWM (17V), but higher VC = 27.9V at 19.1A; slightly lower PPK = 400W | Marginally lower surge endurance; suitable where 400W suffices and Littelfuse supply chain preference applies | Select SMAJ17A only if existing BOM uses SMAJ series or if tighter VC tolerance (±5%) is required |
| ON Semiconductor 1.5SMC17A | DO-214AB (SMC) package - surface-mount, larger footprint; same VWM/VBR/VC specs; PPK = 1500W | Requires PCB redesign; preferred for high-volume automated assembly and higher-power surge immunity | Choose 1.5SMC17A when upgrading to SMT layout or needing >500W headroom for harsher environments |
Compared with SA17A, SMAJ17A offers comparable clamping but reduced surge margin, while 1.5SMC17A trades through-hole convenience for superior power handling and SMT compatibility-neither is pin-compatible due to differing packages and mounting styles.
Availability
SA17A is available at Aetrix Electronics and suitable for automotive ECU protection, industrial sensor interface hardening, and motor drive flyback suppression requiring stable component supply across extended production lifecycles.
Supply support for SA17A 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 for automotive, industrial, and consumer markets.
The SA Series was developed specifically for high-reliability unidirectional transient suppression in AEC-Q101-compliant automotive subsystems and ruggedized industrial controls-emphasizing low clamping voltage, fast response, and high-temperature stability.
FAQ
What is the clamping voltage of SA17A at its rated peak pulse current?
The SA17A has a maximum clamping voltage (VC) of 27.7 V at 19 A peak pulse current (IPPM), measured under the standard 10/1000 μs double-exponential surge waveform. This value ensures protected circuits experience no more than 27.7 V during worst-case transients, making SA17A suitable for safeguarding 3.3 V and 5 V logic interfaces when correctly applied with appropriate trace inductance control.
Is SA17A bidirectional or unidirectional?
SA17A is a unidirectional TVS diode, indicated by the absence of "C" or "CA" suffix and confirmed by its single-polarity marking (cathode band) and specification table listing only unidirectional parameters. It must be oriented with the banded end toward the protected line and the unmarked end toward ground. Using SA17A in bidirectional configurations will result in failure during positive transients.
Does SA17A meet AEC-Q101 qualification?
The base SA17A part is not AEC-Q101 qualified; however, the SA17AH variant (with "H" suffix) is explicitly AEC-Q101 qualified per the ordering information table. Engineers requiring automotive-grade reliability must specify SA17AH-not SA17A-for under-hood or safety-critical applications, as qualification testing includes temperature cycling, humidity bias, and mechanical shock validation beyond standard industrial screening.
What is the maximum junction temperature rating for SA17A?
The SA17A has a maximum junction temperature (TJ max) of +175 °C, enabling operation in high-ambient environments such as engine compartments, industrial motor drives, and enclosed lighting fixtures. This rating is supported by its DO-204AC package's thermal resistance (RθJA ≈ 100 °C/W on standard FR-4), and derating curves confirm usable power dissipation down to +125 °C ambient without exceeding TJ limit.
How does SA17A compare to SA17 in terms of breakdown voltage and leakage?
SA17A specifies a tighter VBR range (18.9–20.9 V) versus SA17 (18.9–23.1 V) at 1 mA test current, indicating improved manufacturing consistency. Reverse leakage (IR) is also lower: SA17A guarantees <1 μA at 17 V, while SA17 allows up to 1 μA but with less stringent typical performance. These differences make SA17A preferable in precision-clamping or ultra-low-power standby applications where parameter spread matters.
SA17A 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:
- 27.7V
- Current - Peak Pulse (10/1000µs):
- 19A
- 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)
SA17A FAQ
1.How can I place an order for SA17A through Aetrix?
Please submit a Request for Quotation (RFQ) for SA17A 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 SA17A reliable?
The price and inventory of SA17A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA17A is usually 5 days.
3.What payment methods are accepted for SA17A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA17A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA17A?
SA17A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA17A 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 SA17A?
For technical support, including SA17A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA17A requirements.
6.How does Aetrix verify that SA17A is sourced from the original manufacturer or authorized distributors?
All SA17A 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 SA17A meets industry standards.
7.What is the process for return or replacement of SA17A?
All SA17A units undergo pre-shipment inspection (PSI). If there is an issue with SA17A, 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 SA17A part is unused and in its original packaging.
Return procedure for SA17A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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