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Taiwan Semiconductor Corporation SMAJ15A
- Part No.:
- SMAJ15A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ15A.pdf
- Description:
- TVS DIODE 15VWM 24.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,297
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Product details
Overview
SMAJ15A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 15 V working stand-off voltage (VWM), 16.7–18.5 V breakdown voltage (VBR) at 1 mA test current, and clamps to ≤24.4 V at 16.4 A peak impulse current under 10/1000 µs waveform - delivering 400 W peak pulse power capability for automotive and industrial surge immunity.
For engineers reviewing the SMAJ15A datasheet, SMAJ15A pinout, SMAJ15A application, or SMAJ15A equivalent, key selection criteria include its DO-214AC (SMA) package compatibility with automated placement, sub-1 ps response time, <1 µA reverse leakage at 15 V, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and unidirectional polarity marking for correct PCB orientation.
Technical Context
The SMAJ15A operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve fast transient response (<1.0 ps from 0 V to VBR min) and stable clamping performance across -55 °C to +150 °C junction temperature range. Its single-die DO-214AC construction supports high surge robustness without derating below 25 °C ambient.
It delivers 400 W peak pulse power (10/1000 µs waveform) up to 78 V VWM; above that threshold, rating reduces to 300 W. The device exhibits ≤3.5 V forward voltage at 25 A and meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15 V - Maximum continuous DC or RMS voltage the device blocks without conduction; defines safe operating rail margin before clamping initiates. |
| VBR @ IT=1 mA | 16.7–18.5 V - Measured breakdown range confirming reliable avalanche turn-on within specification tolerance for consistent protection threshold. |
| VC @ IPPM=16.4 A | ≤24.4 V - Clamped voltage during 10/1000 µs surge; determines maximum stress imposed on downstream circuitry during transient events. |
| PPPM (10/1000 µs) | 400 W - Peak pulse power handling capacity; enables protection against high-energy transients such as load dump or inductive switching spikes. |
| IR @ VWM | ≤1 µA - Reverse leakage current at rated stand-off voltage; ensures minimal quiescent power loss and no interference with low-power sensor or logic circuits. |
| Package | DO-214AC (SMA) - Standardized surface-mount outline with cathode band marking; compatible with reflow soldering and automated pick-and-place equipment. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive, industrial power supply, and high-temperature PCB environments. |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band on one end. Weight ≈ 0.060 g. UL 94V-0 rated molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; completes conduction path during reverse-biased transient clamping. |
| Cathode | High-side protected node | Connected to protected line (e.g., 12 V rail); marked by band; conducts when line voltage exceeds VBR relative to anode. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable, repeatable avalanche characteristics over temperature and lifetime; prevents degradation from humidity or contamination. |
| Response time <1.0 ps | Enables suppression of ultrafast ESD and lightning-induced transients before sensitive ICs experience overstress. |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validated for automotive 12 V system immunity including battery disconnect, alternator load dump, and capacitive coupling noise. |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS Directive; supports environmentally compliant manufacturing and end-of-life recycling. |
| J-STD-020 Level 1 MSL | Allows unlimited floor life before reflow; eliminates bake-out requirement and simplifies SMT assembly logistics. |
Applications
| Automotive Power Rail Protection | Industrial SMPS Input Stage |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump pulses (ISO 7637-2 Pulse 5a) and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and ground, clamping surges >30 V while maintaining 15 V nominal operation. Use Value: Limits peak voltage to ≤24.4 V during 16.4 A transients, preventing damage to MCU power supplies and CAN transceivers. |
Use Scenario: Safeguarding AC-DC adapter primary-side rectifier output or DC-DC converter input against line surges and switching spikes. IC Role / Device Role / Timing Role: Standoff protector on bulk capacitor input; absorbs repetitive 400 W pulses without thermal runaway. Use Value: Maintains ≤1 µA leakage at 15 V, avoiding efficiency loss in standby mode while surviving 8.3 ms half-sine surges up to 40 A. |
| LED Driver Overvoltage Clamp | On-Board DC/DC Converter Input |
Use Scenario: Preventing catastrophic failure of constant-current LED drivers due to accidental 24 V connection to 12 V-rated modules. IC Role / Device Role / Timing Role: Front-end clamp on driver input; activates within picoseconds to limit overvoltage before internal FETs rupture. Use Value: Clamps 16.4 A surge to ≤24.4 V, preserving driver IC integrity and enabling fail-safe operation without fuse dependency. |
Use Scenario: Shielding point-of-load (POL) converters in telecom or server boards from upstream bus transients. IC Role / Device Role / Timing Role: Localized TVS adjacent to DC/DC input pins; provides low-inductance path to ground for fast-rising edges. Use Value: DO-214AC footprint minimizes parasitic inductance; sub-1 ps response ensures clamping precedes internal controller overvoltage shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ15A (Bourns) | Same VWM (15 V), VBR (16.7–18.5 V), VC (≤24.4 V), but in larger DO-214AA (SMB) package; 600 W PPK rating. | Higher power handling suits higher-energy transients; SMB footprint requires PCB layout change vs. SMA. | Select SMBJ15A only if surge energy exceeds 400 W or thermal mass demands larger package; not drop-in replacement. |
| P6SMB15A (Littelfuse) | Identical electrical specs (VWM=15 V, VBR=16.7–18.5 V, VC≤24.4 V), DO-214AA (SMB) package, 600 W rating, same ISO 7637-2 compliance. | Designed for identical automotive/industrial use cases but requires pad redesign; slightly higher IR (≤1 µA same). | Choose P6SMB15A when sourcing diversity is required or when existing SMB footprints exist; SMAJ15A preferred for space-constrained layouts. |
Compared with SMBJ15A and P6SMB15A, the SMAJ15A offers identical clamping performance in a smaller DO-214AC footprint - reducing board area by ~30% and enabling tighter routing near sensitive inputs, while maintaining full ISO 7637-2 compliance and 1 µA leakage at 15 V.
Availability
SMAJ15A is available at Aetrix Electronics and suitable for automotive electronics, industrial switch-mode power supplies, LED lighting systems, and on-board DC/DC converters requiring stable component supply with full traceability and lifecycle support.
Supply support for SMAJ15A 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, serving global automotive, industrial, and consumer markets since 1979.
The SMAJ series is part of TSC's transient protection portfolio, engineered specifically for high-reliability unidirectional surge suppression in harsh environments - emphasizing fast response, low leakage, and automotive-grade qualification.
FAQ
What is the maximum clamping voltage of the SMAJ15A under standard test conditions?
The SMAJ15A has a maximum clamping voltage (VC) of 24.4 V when subjected to a 10/1000 µs waveform with a peak impulse current (IPPM) of 16.4 A. This value is measured per JEDEC standards and guarantees predictable overvoltage limiting for downstream components. The SMAJ15A maintains this clamping performance across its full operating temperature range of -55 °C to +150 °C.
Is the SMAJ15A suitable for bidirectional transient protection?
No, the SMAJ15A is a unidirectional TVS diode and must be used with correct polarity - cathode connected to the protected line, anode to ground. For bidirectional protection, TSC offers the SMAJ15CA variant (with "CA" suffix), which provides symmetrical clamping in both directions. Using SMAJ15A in reverse-biased configuration will result in forward conduction and potential failure.
Does the SMAJ15A meet automotive industry surge immunity standards?
Yes, the SMAJ15A is explicitly rated to meet ISO 7637-2 for automotive transient immunity, covering Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling). Its 400 W peak pulse power rating and fast <1 ps response ensure robust protection in 12 V vehicle electrical systems.
What is the moisture sensitivity level (MSL) of the SMAJ15A, and how does it affect assembly?
The SMAJ15A is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life at ≤30 °C/60% RH and requires no baking prior to reflow soldering. This simplifies SMT line integration, eliminates moisture-related popcorning risk, and supports just-in-time manufacturing without special handling protocols for the SMAJ15A.
How does the SMAJ15A compare to the SMAJ15 (non-A) version?
The SMAJ15A offers tighter breakdown voltage tolerance (16.7–18.5 V) versus SMAJ15 (16.7–20.4 V), resulting in more consistent clamping onset and reduced variation in protected circuit stress. Both share identical VWM (15 V), VC (24.4 V vs. 26.9 V), and package (DO-214AC), but SMAJ15A's lower max VC improves safety margin for sensitive loads.
SMAJ15A 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):
- 15V
- Voltage - Breakdown (Min):
- 16.7V
- Voltage - Clamping (Max) @ Ipp:
- 24.4V
- Current - Peak Pulse (10/1000µs):
- 16.4A
- 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)
SMAJ15A FAQ
1.How can I place an order for SMAJ15A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ15A 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 SMAJ15A reliable?
The price and inventory of SMAJ15A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ15A is usually 5 days.
3.What payment methods are accepted for SMAJ15A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ15A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ15A?
SMAJ15A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ15A 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 SMAJ15A?
For technical support, including SMAJ15A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ15A requirements.
6.How does Aetrix verify that SMAJ15A is sourced from the original manufacturer or authorized distributors?
All SMAJ15A 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 SMAJ15A meets industry standards.
7.What is the process for return or replacement of SMAJ15A?
All SMAJ15A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ15A, 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 SMAJ15A part is unused and in its original packaging.
Return procedure for SMAJ15A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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