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Taiwan Semiconductor Corporation SMAJ17H
- Part No.:
- SMAJ17H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ17H.pdf
- Description:
- TVS DIODE 17VWM 30.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,143
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Product details
Overview
SMAJ17H from Taiwan Semiconductor is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, with 17V working stand-off voltage (VWM), 18.9–23.1V breakdown voltage (VBR), and 30.5V clamping voltage (VC) at 13.1A peak pulse current. It delivers AEC-Q101 qualification and meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive power line protection.
For engineers reviewing the SMAJ17H datasheet, SMAJ17H pinout, SMAJ17H application, or SMAJ17H equivalent, this device is selected for robust overvoltage protection in DC/DC converters, SMPS inputs, lighting drivers, and automotive electronics where fast response (<1.0ps), low leakage (<1µA @ VWM), and high surge immunity are critical.
Technical Context
The SMAJ17H operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its specified VBR range (18.9–23.1V at 1mA test current). Its glass-passivated junction ensures stable breakdown and low leakage, while its DO-214AC package supports automated placement and meets JESD201 Class 2 whisker resistance.
It handles 400W peak pulse power per 10/1000μs waveform up to 125°C ambient, derating linearly above 25°C per Fig.2. With TJ max = 150°C and TSTG = −55 to +150°C, it supports extended industrial and automotive temperature operation without thermal runaway under transient stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 17 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 18.9 / 23.1 V - Breakdown occurs within this range at 1 mA, defining turn-on threshold tolerance |
| VC @ IPPM | 30.5 V - Clamped voltage across device at 13.1 A peak impulse, limiting downstream voltage stress |
| PPPM | 400 W - Peak surge power survivability using standard 10/1000μs waveform |
| IR @ VWM | <1 µA - Reverse leakage at rated stand-off voltage, minimizing quiescent power loss |
| Package | DO-214AC (SMA) - Surface-mount outline with cathode band marking, UL 94V-0 compliant molding |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band. Weight ≈ 0.060 g. Compliant with J-STD-002 solderability and JESD201 Class 2 whisker testing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 12V rail); conducts during overvoltage to shunt energy to ground |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness |
| Fast response time | <1.0 ps rise from 0 V to VBR min - enables protection of high-speed digital and analog circuits |
| Glass passivated junction | Stable VBR tolerance and low IR drift over lifetime and temperature extremes |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) |
Applications
| Automotive Power Line Protection | Industrial DC/DC Converter Input |
|---|---|
Use Scenario: Protecting 12V battery-fed ECUs against load dump and alternator transients per ISO 7637-2. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp surges before they reach downstream regulators and microcontrollers. Use Value: Limits peak rail voltage to ≤30.5V during 400W transients, preventing damage to 3.3V/5V logic and CAN transceivers. | Use Scenario: Safeguarding isolated DC/DC converter primary-side input against switching noise and external surges. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing repetitive 10/1000μs pulses induced by MOSFET switching or nearby inductive loads. Use Value: Maintains <1µA leakage at 17V, avoiding efficiency loss while delivering 13.1A surge current handling without degradation. |
| LED Driver Power Stage | AC-DC Adapter Secondary Side |
Use Scenario: Shielding constant-current LED driver ICs from voltage spikes caused by hot-plug events or cable discharge. IC Role / Device Role / Timing Role: Fast-clamping unidirectional suppressor on output rail, referenced to system ground, activated within picoseconds. Use Value: Clamps to 30.5V before driver IC's absolute maximum rating is exceeded, preserving PWM timing integrity and thermal stability. | Use Scenario: Adding secondary-side surge immunity to universal-input AC-DC adapters used in consumer and industrial equipment. IC Role / Device Role / Timing Role: Standoff-rated TVS on low-voltage DC output (e.g., 12V/19V), absorbing ESD and line-induced transients before reaching USB or PoE circuitry. Use Value: Enables RoHS- and halogen-free compliance while meeting IEC/EN 61000-4-5 Level 3 immunity requirements via 400W pulse capability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ17AHE3/5A | Same DO-214AC package, bidirectional variant (CA suffix implied), VBR 18.9–20.9V, VC = 27.6V @ 14.5A | Supports bipolar transients (e.g., ±12V data lines); lower clamping but reduced unidirectional surge margin | Select for dual-polarity protection where symmetric clamping is required; not drop-in for unidirectional rail protection |
| Vishay SMAJ17A-M3/5A | DO-214AC, unidirectional, VBR 18.9–20.9V, VC = 27.6V @ 14.5A, AEC-Q101 qualified, same 400W rating | Identical electrical envelope and automotive qualification; minor VBR tolerance difference (±2.2V vs ±2.1V) | Direct functional alternative with identical mounting and thermal profile; verify marking code compatibility in automated assembly |
Compared with SMAJ17H, the Vishay SMAJ17A-M3/5A offers nearly identical clamping and surge performance with tighter VBR tolerance, while Littelfuse SMAJ17AHE3/5A provides bidirectional capability at the cost of higher leakage in unidirectional use cases - both require validation of layout polarity and thermal relief.
Availability
SMAJ17H is available at Aetrix Electronics and suitable for automotive electronics, industrial DC/DC converters, and LED lighting systems requiring stable component supply, AEC-Q101 compliance, and repeatable 400W transient suppression performance.
Supply support for SMAJ17H 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 SMAJ series was designed specifically for high-reliability transient suppression in harsh environments, emphasizing AEC-Q101 qualification, ISO 7637-2 compliance, and surface-mount manufacturability in DO-214AC packaging.
FAQ
What is the clamping voltage of SMAJ17H and how is it measured?
The SMAJ17H has a maximum clamping voltage (VC) of 30.5 V, measured at 13.1 A peak impulse current (IPPM) using the standardized 10/1000 μs double-exponential waveform. This value is guaranteed per datasheet Table "ELECTRICAL SPECIFICATIONS" and defines the upper voltage limit imposed on protected circuitry during surge events. The clamping behavior is repeatable and stable due to the device's glass-passivated junction and controlled avalanche characteristics.
Is SMAJ17H suitable for automotive applications?
Yes, SMAJ17H is AEC-Q101 qualified and explicitly tested to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements - making it suitable for 12V and 24V automotive power networks. Its operating junction temperature range (−55°C to +150°C), moisture sensitivity level 1 rating, and JESD201 Class 2 whisker resistance further validate its suitability for under-hood and infotainment module designs.
What is the difference between SMAJ17H and SMAJ17AH?
SMAJ17AH has a tighter breakdown voltage range (18.9–20.9 V) versus SMAJ17H (18.9–23.1 V), resulting in lower clamping voltage (27.6 V vs 30.5 V) and higher peak impulse current (14.5 A vs 13.1 A). Both share identical VWM (17 V), package (DO-214AC), and AEC-Q101 qualification. SMAJ17AH is preferred where precise, low-VBR triggering is needed; SMAJ17H offers broader tolerance for cost-sensitive or less tightly regulated rails.
Does SMAJ17H have polarity markings, and how is it installed?
Yes, SMAJ17H uses a cathode band marking on the DO-214AC body to indicate polarity. As a unidirectional TVS, it must be installed with the cathode connected to the protected line (e.g., +12V rail) and the anode tied to ground. Reversal will prevent proper clamping and may cause catastrophic failure under reverse bias beyond its 17 V VWM rating.
What is the peak pulse power rating of SMAJ17H and under what conditions?
SMAJ17H is rated for 400 W peak pulse power using the industry-standard 10/1000 μs waveform (10 μs rise time, 1000 μs full width at half maximum). This rating applies at TA = 25°C and derates linearly above that temperature per the Pulse Derating Curve (Fig.2). At 125°C ambient, its usable peak power drops to approximately 200 W, ensuring safe operation across full industrial and automotive temperature ranges.
SMAJ17H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AC, SMA
- Series:
- SMAJ
- 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):
- 13.1A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ17H FAQ
1.How can I place an order for SMAJ17H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ17H 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 SMAJ17H reliable?
The price and inventory of SMAJ17H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ17H is usually 5 days.
3.What payment methods are accepted for SMAJ17H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ17H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ17H?
SMAJ17H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ17H 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 SMAJ17H?
For technical support, including SMAJ17H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ17H requirements.
6.How does Aetrix verify that SMAJ17H is sourced from the original manufacturer or authorized distributors?
All SMAJ17H 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 SMAJ17H meets industry standards.
7.What is the process for return or replacement of SMAJ17H?
All SMAJ17H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ17H, 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 SMAJ17H part is unused and in its original packaging.
Return procedure for SMAJ17H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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