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Taiwan Semiconductor Corporation SMAJ17
- Part No.:
- SMAJ17
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ17.pdf
- Description:
- 400W, 21V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:7,418
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Product details
Overview
SMAJ17 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) at 1 mA test current, 30.5 V maximum clamping voltage (VC) at 13.1 A peak pulse current, and 400 W peak pulse power rating per 10/1000 µs waveform - used in SMPS input protection and on-board DC/DC converters.
For engineers reviewing the SMAJ17 datasheet, SMAJ17 pinout, SMAJ17 application, or SMAJ17 equivalent, key selection criteria include clamping voltage margin relative to protected IC VDD rails, leakage current (<1 µA at 17 V), thermal derating above 25°C ambient, and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive electronics.
Technical Context
The SMAJ17 operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its specified breakdown range. Its glass-passivated junction ensures stable VBR tolerance and low leakage, while the DO-214AC package supports automated placement and meets JESD201 Class 2 whisker resistance.
It delivers sub-nanosecond response (typically <1.0 ps from 0 V to VBR min) and handles non-repetitive 13.1 A peak impulse current under 10/1000 µs waveform. Thermal performance is defined by a 150°C maximum junction temperature and 1 W steady-state power dissipation, with derating above 25°C per published curve.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 17 V - Maximum continuous reverse operating voltage before clamping begins; sets upper limit for protected circuit's nominal rail. |
| VBR @ IT=1 mA | 18.9–23.1 V - Breakdown voltage range defining turn-on threshold; tight tolerance enables predictable clamping onset. |
| VC @ IPPM=13.1 A | 30.5 V - Maximum clamped voltage during 10/1000 µs surge; determines worst-case overvoltage seen by downstream ICs. |
| PPPM | 400 W - Peak pulse power handling capability; defines energy absorption capacity for transient suppression. |
| IR @ VWM | <1 µA - Reverse leakage at stand-off voltage; ensures negligible standby power loss and signal integrity in high-impedance nodes. |
| TJ max | 150 °C - Maximum allowable junction temperature; constrains layout thermal design and power cycling limits. |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, single-diode configuration with cathode band marking. Matte tin-plated leads, UL 94V-0 molding compound, moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND or return path) in unidirectional configuration. |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., +12 V rail); conducts only during overvoltage events to clamp to VC. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable VBR over time and temperature, critical for long-term reliability in industrial power supplies. |
| Fast response time <1.0 ps | Enables effective suppression of nanosecond-scale ESD and switching transients before sensitive ICs are damaged. |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validates suitability for automotive 12 V system protection without additional filtering stages. |
| RoHS & halogen-free | Meets IEC 61249-2-21 and environmental compliance requirements for global electronics manufacturing. |
Applications
| Switching Mode Power Supply (SMPS) Input Protection | On-Board DC/DC Converter Rail Clamping |
|---|---|
Use Scenario: Protects primary-side rectifier output and secondary-side 12 V/5 V rails against load dump and inductive switching spikes. IC Role / Device Role: Unidirectional TVS placed between rail and ground to clamp transients exceeding VWM. Use Value: Limits peak voltage to 30.5 V during 400 W surges, preventing damage to PWM controllers and MOSFET gate drivers. | Use Scenario: Shields point-of-load regulators in embedded systems from cross-coupled noise and hot-swap transients. IC Role / Device Role: Standoff-rated clamping device on 3.3 V or 5 V output rails, sized for 13.1 A impulse current. Use Value: Maintains rail integrity below 30.5 V during 10/1000 µs pulses, preserving logic-level compatibility with microcontrollers and FPGAs. |
| Automotive Body Control Module (BCM) | Industrial LED Driver Surge Protection |
Use Scenario: Installed on LIN bus power lines and sensor supply inputs exposed to battery transients in vehicle subsystems. IC Role / Device Role: Unidirectional transient suppressor meeting ISO 7637-2 Pulse 1 (inductive load disconnect) and Pulse 2b (switching spikes). Use Value: Withstands 13.1 A peak current and clamps to ≤30.5 V, ensuring CAN/LIN transceivers remain functional after load dump events. | Use Scenario: Placed across constant-current LED string inputs to absorb lightning-induced surges in outdoor signage and street lighting. IC Role / Device Role: Primary overvoltage protection element rated for repetitive 400 W pulses in thermally managed PCB layouts. Use Value: Delivers 30.5 V clamping at 13.1 A, preventing catastrophic failure of LED driver ICs and maintaining lumen output stability. |
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 vs. 18.9–23.1 V); tighter 5% tolerance; same VWM, VC, and PPPM. | Better suited for precision-clamp designs where tighter VBR consistency reduces margin uncertainty. | Select SMAJ17A when VBR matching across production lots is critical; SMAJ17 offers broader tolerance for cost-sensitive volume applications. |
| SMBJ17 | Same electrical specs but in larger DO-214AA (SMB) package; higher thermal mass and 1.5 W steady-state power rating. | Preferred in high-temperature environments (>85°C ambient) or where board space allows larger footprint for improved thermal dissipation. | Choose SMBJ17 if thermal derating headroom or long-duration surge robustness is required; SMAJ17 prioritizes compactness and SMT automation. |
Compared with SMAJ17A and SMBJ17, the SMAJ17 balances cost-effective DO-214AC packaging, industry-standard ISO 7637-2 compliance, and sufficient clamping margin for general-purpose 12–24 V DC systems - making it optimal for space-constrained consumer and industrial power interfaces.
Availability
SMAJ17 is available at Aetrix Electronics and suitable for switching mode power supplies, automotive body control modules, and industrial LED drivers requiring stable component supply, consistent parametric performance, and RoHS-compliant sourcing.
Supply support for SMAJ17 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, and power management components.
The SMAJ series was developed for high-reliability transient suppression in automotive, industrial, and computing power systems - emphasizing fast response, low leakage, and standardized DO-214AC packaging for global SMT assembly.
FAQ
What is the maximum clamping voltage of the SMAJ17 under standard test conditions?
The SMAJ17 has a maximum clamping voltage (VC) of 30.5 V when subjected to a 10/1000 µs waveform with a peak impulse current (IPPM) of 13.1 A. This value is measured at TA = 25°C and defines the highest voltage the device allows to pass through during a transient event. The SMAJ17 maintains this clamping performance consistently across its qualified operating temperature range, making it reliable for protecting 12 V and 24 V power rails.
Is the SMAJ17 suitable for bidirectional transient protection?
No, the SMAJ17 is a unidirectional TVS diode intended for DC line protection with polarity-sensitive placement. For bidirectional applications such as AC lines or data bus protection, the SMAJ17C or SMAJ17CA variants must be used - these include internal back-to-back diode configuration. The SMAJ17 itself features a cathode band marking and is rated only for reverse-biased clamping operation.
What is the reverse leakage current specification for the SMAJ17 at its working stand-off voltage?
The SMAJ17 exhibits a maximum reverse leakage current (IR) of 1 µA when biased at its 17 V working stand-off voltage (VWM), tested at TA = 25°C. This low leakage ensures minimal power loss in standby mode and avoids interference with high-impedance sensing circuits. The SMAJ17 maintains IR < 1 µA across its full operating temperature range, supporting energy-efficient designs in battery-powered and always-on systems.
Does the SMAJ17 meet automotive transient immunity standards?
Yes, the SMAJ17 is explicitly rated to meet ISO 7637-2 for automotive applications, covering Pulse 1 (inductive load disconnect), Pulse 2a (sudden load release), Pulse 2b (switching spikes), and Pulses 3a/3b (capacitive coupling transients). Its 400 W peak pulse power rating and sub-nanosecond response make it suitable for protecting ECUs, BCMs, and infotainment power inputs - provided layout follows recommended trace width and grounding practices per Taiwan Semiconductor's application guidelines for SMAJ17.
What is the package type and mounting compatibility of the SMAJ17?
The SMAJ17 uses the DO-214AC (SMA) surface-mount package, with matte tin-plated leads compliant with J-STD-002 solderability requirements. It supports standard reflow profiles and is optimized for high-speed pick-and-place assembly. The SMAJ17's footprint matches IPC-7351B generic SMA land pattern, and its 0.060 g weight and UL 94V-0 molding compound ensure compatibility with automated manufacturing and flame-retardant PCB requirements.
SMAJ17 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ17 FAQ
1.How can I place an order for SMAJ17 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ17 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 SMAJ17 reliable?
The price and inventory of SMAJ17 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ17 is usually 5 days.
3.What payment methods are accepted for SMAJ17?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ17 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ17?
SMAJ17 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ17 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 SMAJ17?
For technical support, including SMAJ17 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ17 requirements.
6.How does Aetrix verify that SMAJ17 is sourced from the original manufacturer or authorized distributors?
All SMAJ17 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 SMAJ17 meets industry standards.
7.What is the process for return or replacement of SMAJ17?
All SMAJ17 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ17, 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 SMAJ17 part is unused and in its original packaging.
Return procedure for SMAJ17:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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