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Taiwan Semiconductor Corporation SMAJ17C
- Part No.:
- SMAJ17C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ17C.pdf
- Description:
- 400W, 21V, 10%, BIDIRECTIONAL, T
- Quantity:
- Payment:
- Shipping:
Inventory:9,654
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Product details
Overview
SMAJ17C from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping fast transients in DC power lines. It features a 17 V working stand-off voltage (VWM), 18.9–23.1 V breakdown voltage (VBR @ 1 mA), 30.5 V maximum clamping voltage (VC) at 13.1 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform.
For engineers reviewing the SMAJ17C datasheet, SMAJ17C pinout, SMAJ17C application, or SMAJ17C equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, junction temperature limits (−55 °C to +150 °C), and compatibility with automated SMT placement on 1 W steady-state power-constrained PCBs.
Technical Context
The SMAJ17C operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its specified VBR range (18.9–23.1 V). Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1 µA at VWM = 17 V), while sub-1 ps response time enables effective suppression of ESD and load-dump transients.
It is rated for 400 W peak pulse power (10/1000 µs), derated linearly above 25 °C ambient per Fig.2, and supports 40 A non-repetitive forward surge (8.3 ms half-sine). Polarity is marked by cathode band; terminals are matte tin-plated for J-STD-002 solderability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 17 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 18.9 V / 23.1 V @ 1 mA - Ensures reliable turn-on margin above VWM with production tolerance |
| VC @ IPPM | 30.5 V @ 13.1 A - Clamped voltage seen by protected circuit during 10/1000 µs transient |
| PPPM | 400 W - Peak transient energy absorption capability without failure |
| IR @ VWM | <1 µA - Negligible leakage current preserves efficiency in low-power standby circuits |
| TJ max | +150 °C - Enables use in high-temperature automotive or industrial environments |
| Package | DO-214AC (SMA) - Standardized SMT footprint compatible with JEDEC MS-013AC |
Pinout & Package
DO-214AC (SMA) package: surface-mount, single-diode configuration, cathode indicated by molded band. Dimensions conform to JEDEC outline MO-136AB. Matte tin-plated leads meet J-STD-002 solderability requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path / Transient return path | Connected to system ground or low-impedance return node during clamping |
| Cathode | Protected line connection / Clamping reference | Connected to line being protected (e.g., 12 V rail); polarity marking critical for unidirectional operation |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Stable VBR over life and temperature; eliminates parameter drift due to moisture or contamination |
| Sub-1 ps response time | Clamps ESD and fast-edge transients before downstream ICs experience overstress |
| ISO 7637-2 compliance | Validated for automotive load-dump (Pulse 2b), supply interruption (Pulse 3b), and coupled noise (Pulse 1) |
| Moisture sensitivity level 1 | No floor-life limitation or bake requirement prior to reflow; simplifies SMT manufacturing |
| RoHS & halogen-free | Meets IEC 61249-2-21; suitable for consumer, industrial, and automotive end-equipment |
Applications
| Automotive Power Rail Protection | Industrial DC/DC Converter Input |
|---|---|
Use Scenario: 12 V battery-fed ECU power input subjected to load-dump pulses up to 35 V and ISO 7637-2 Pulse 2b. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between input rail and ground, activated within <1 ps to limit transient voltage. Use Value: Limits peak voltage to ≤30.5 V at 13.1 A, protecting downstream regulators and microcontrollers from permanent damage. | Use Scenario: 24 V industrial PLC power module with DC/DC converter input exposed to switching noise and inductive kickback. IC Role / Device Role / Timing Role: Standoff protector on primary-side input, absorbing repetitive 400 W transients without degradation. Use Value: Maintains <1 µA leakage at 17 V, minimizing quiescent loss while enabling robust 150 °C junction operation in enclosed enclosures. |
| LED Driver Overvoltage Clamp | Adapter Secondary-Side Surge Suppression |
Use Scenario: Constant-current LED driver board where output voltage may overshoot during hot-plug or dimming transitions. IC Role / Device Role / Timing Role: Unidirectional clamp across LED string anode-to-ground, triggered only on overvoltage events. Use Value: Clamps to 30.5 V before LED forward voltage exceeds safe limit, preventing catastrophic LED array failure. | Use Scenario: AC/DC adapter secondary-side rectifier output subjected to lightning-induced surges on low-voltage DC output. IC Role / Device Role / Timing Role: Final-stage transient suppressor before USB or 5 V logic rails. Use Value: Provides 400 W pulse handling with 17 V standoff, ensuring no false triggering during normal 19 V adapter ripple. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ17A | Narrower VBR range (18.9–20.9 V) and lower VC (27.6 V @ 14.5 A); same package and PPPM | Better clamping ratio (VC/VBR ≈ 1.46 vs. 1.51), suited for tighter voltage margins | Select SMAJ17A when downstream IC absolute maximum ratings require lowest possible clamped voltage. |
| SMBJ17C | Same electrical specs but SMB (DO-214AA) package - 2.5 mm wider body, higher thermal mass, 600 W PPPM | Higher power handling and improved thermal dissipation; requires larger PCB footprint | Choose SMBJ17C for high-reliability industrial designs needing >400 W margin or extended surge endurance. |
Compared with SMAJ17A and SMBJ17C, the SMAJ17C offers balanced clamping performance and standard SMT manufacturability in the smallest DO-214AC footprint, making it optimal for space-constrained automotive and consumer power interfaces where 400 W pulse rating suffices.
Availability
SMAJ17C is available at Aetrix Electronics and suitable for automotive ECUs, industrial DC/DC converters, LED lighting drivers, and AC/DC adapter secondary-side protection requiring stable component supply and full traceability.
Supply support for SMAJ17C 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, MOSFETs, and power management devices.
The SMAJ series is part of TSC's transient suppression product line, engineered for automotive-grade reliability, ISO 7637-2 compliance, and high-volume SMT deployment in harsh-environment power systems.
FAQ
What is the polarity configuration of the SMAJ17C?
The SMAJ17C is a unidirectional TVS diode, with cathode identified by a molded band on the DO-214AC package. It conducts only in reverse bias during overvoltage events and blocks forward current up to 3.5 V at 25 A. This configuration makes SMAJ17C suitable for DC power rail protection where polarity is fixed and reverse transients dominate.
Does the SMAJ17C meet automotive transient standards?
Yes, the SMAJ17C meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements for 12 V systems. Its 400 W peak pulse power rating, fast <1 ps response, and verified clamping behavior under standardized waveforms make SMAJ17C appropriate for engine control units, body controllers, and infotainment power inputs in passenger vehicles.
What is the maximum clamping voltage of the SMAJ17C under standard test conditions?
The SMAJ17C has a maximum clamping voltage (VC) of 30.5 V at 13.1 A peak pulse current (IPPM) using the 10/1000 µs waveform. This value is guaranteed across the full operating temperature range and represents the highest voltage the protected circuit will experience during a worst-case transient event.
Can the SMAJ17C be used in bidirectional applications?
No - the SMAJ17C is unidirectional only. For bidirectional transient suppression, TSC specifies the SMAJ17CA variant (with 'CA' suffix), which provides symmetrical clamping in both polarities. Using SMAJ17C in AC or reversible-polarity circuits risks failure due to forward conduction during negative transients.
What is the steady-state power dissipation rating for the SMAJ17C?
The SMAJ17C has a steady-state power dissipation (PD) rating of 1 W at 25 °C ambient, derated linearly to zero at 150 °C junction temperature. This rating applies only to continuous DC or low-frequency leakage conditions - not to transient events, where the 400 W peak pulse power rating governs.
SMAJ17C 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:
- -
- Bidirectional Channels:
- 1
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ17C FAQ
1.How can I place an order for SMAJ17C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ17C 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 SMAJ17C reliable?
The price and inventory of SMAJ17C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ17C is usually 5 days.
3.What payment methods are accepted for SMAJ17C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ17C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ17C?
SMAJ17C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ17C 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 SMAJ17C?
For technical support, including SMAJ17C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ17C requirements.
6.How does Aetrix verify that SMAJ17C is sourced from the original manufacturer or authorized distributors?
All SMAJ17C 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 SMAJ17C meets industry standards.
7.What is the process for return or replacement of SMAJ17C?
All SMAJ17C units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ17C, 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 SMAJ17C part is unused and in its original packaging.
Return procedure for SMAJ17C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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