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Taiwan Semiconductor Corporation SMAJ15AH
- Part No.:
- SMAJ15AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ15AH.pdf
- Description:
- TVS DIODE 15VWM 24.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,291
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Product details
Overview
SMAJ15AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails. 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 transients to ≤24.4 V at 16.4 A peak impulse current under 10/1000 µs waveform - enabling reliable protection of automotive-grade SMPS and on-board DC/DC converters.
For engineers reviewing the SMAJ15AH datasheet, SMAJ15AH pinout, SMAJ15AH application, or SMAJ15AH equivalent, key selection criteria include its AEC-Q101 qualification, DO-214AC (SMA) package compatibility with automated placement, sub-1 ps response time, <1 µA leakage above 15 V, and ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance for automotive electrical system resilience.
Technical Context
The SMAJ15AH operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve fast transient suppression with minimal capacitance. Its clamping behavior is defined by a 10/1000 µs double-exponential pulse waveform, delivering 400 W peak pulse power at TA = 25°C (derated linearly above that temperature).
It supports operation across –55 °C to +150 °C junction temperature range and meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity requirements - confirming suitability for reflow-soldered automotive and industrial PCB assemblies without special handling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15 V - Maximum continuous reverse operating voltage before significant leakage; sets safe DC rail margin for 12 V automotive systems. |
| VBR min/max | 16.7 V / 18.5 V @ 1 mA - Confirmed avalanche onset range; ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 24.4 V @ 16.4 A - Clamped voltage under 10/1000 µs surge; defines worst-case stress on downstream ICs. |
| PPPM | 400 W - Peak pulse power rating per 10/1000 µs waveform; validates protection capability against ISO 7637-2 Pulse 1 & 2b. |
| IR @ VWM | <1 µA - Reverse leakage at rated stand-off; minimizes quiescent power loss in battery-powered systems. |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive environments with high ambient thermal load. |
Pinout & Package
DO-214AC (SMA) surface-mount package: molded epoxy case with matte tin-plated leads, polarity indicated by cathode band, UL 94V-0 flammability rating, and 0.060 g typical weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path); conducts during forward surge or bidirectional variants. |
| Cathode | Avalanche clamping terminal | Connected to protected line (e.g., 12 V rail); initiates clamping when reverse voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress-test requirements including temperature cycling, HTRB, and ESD - no additional qualification needed for Tier 1 designs. |
| Glass-passivated junction | Ensures stable VBR and low leakage over lifetime; eliminates risk of junction degradation due to humidity or contamination in harsh environments. |
| Fast response time <1 ps | Clamps ESD and lightning-induced transients before sensitive logic or analog circuitry sustains damage - critical for CAN/LIN bus node protection. |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive load dump), Pulse 2a (switching transients), Pulse 2b (battery disconnect), and Pulses 3a/3b (capacitive coupling) - full coverage for 12 V vehicle networks. |
Applications
| Automotive Power Distribution | Industrial DC/DC Converters |
|---|---|
Use Scenario: Protecting 12 V supply lines feeding body control modules (BCM), lighting controllers, and sensor hubs against load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input rail and chassis ground to clamp surges exceeding 15 V while remaining transparent during normal operation. Use Value: Prevents latch-up or permanent damage to microcontrollers and CAN transceivers by limiting transient voltage to ≤24.4 V at 16.4 A. | Use Scenario: Safeguarding isolated 24 V-to-5 V DC/DC converter inputs in programmable logic controllers (PLCs) exposed to factory floor EMI and relay coil kickback. IC Role / Device Role / Timing Role: Standoff-rated transient suppressor mounted at converter input filter stage to absorb repetitive 400 W pulses without derating or thermal runaway. Use Value: Enables continuous operation under IEC 61000-4-5 surge conditions while maintaining <1 µA leakage to preserve efficiency. |
| LED Driver Power Stages | Automotive Lighting Modules |
Use Scenario: Shielding constant-current LED drivers from voltage reversals and hot-swap transients during field maintenance or battery replacement. IC Role / Device Role / Timing Role: Unidirectional clamping device connected anode-to-ground, cathode-to-input, acting as last-line defense before driver ICs. Use Value: Guarantees ≤24.4 V clamping at 16.4 A, preventing gate oxide rupture in MOSFET-based current regulators. | Use Scenario: Integrated into headlamp and tail lamp PCBs to meet OEM EMC requirements for pulse immunity per ISO 16750-2. IC Role / Device Role / Timing Role: Automotive-qualified TVS suppressing transients induced by alternator ripple, starter motor engagement, and ESD discharge near housing seams. Use Value: AEC-Q101 qualification and DO-214AC reflow compatibility allow direct integration into automated SMT lines without process changes. |
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 SMAJ15A | Identical VWM (15 V), VBR (16.7–18.5 V), VC (24.4 V), and DO-214AC package; same 400 W PPPM rating and AEC-Q101 qualification. | No functional difference; validated for identical ISO 7637-2 pulse profiles and automotive thermal environments. | Select based on distributor lead time and traceability requirements - both meet full specification equivalence. |
| ON Semiconductor SMAJ15A | VWM = 15 V, VBR = 16.7–18.5 V, VC = 24.4 V, same DO-214AC package and 400 W rating; also AEC-Q101 qualified and ISO 7637-2 compliant. | Functionally interchangeable in all listed applications; minor differences in IR distribution and thermal resistance not affecting system-level performance. | Preferred where ON Semi's long-term supply assurance or dual-sourcing strategy applies - no design or layout impact. |
Compared with SMAJ15AH, both Littelfuse SMAJ15A and ON Semiconductor SMAJ15A deliver identical clamping performance, automotive qualification, and package compatibility - making them direct alternatives without circuit or layout revision, though Taiwan Semiconductor's version offers tighter VBR consistency per production lot.
Availability
SMAJ15AH is available at Aetrix Electronics and suitable for automotive power distribution, industrial DC/DC converters, and LED driver protection requiring stable component supply with full AEC-Q101 traceability and ISO 7637-2 compliance.
Supply support for SMAJ15AH 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, and rectifiers with global automotive and industrial certifications.
The SMAJ series was developed specifically for high-reliability transient suppression in automotive and industrial power systems - emphasizing AEC-Q101 qualification, fast clamping response, and robust DO-214AC packaging for automated assembly.
FAQ
What is the maximum clamping voltage of the SMAJ15AH under standard test conditions?
The SMAJ15AH has a maximum clamping voltage (VC) of 24.4 V when subjected to a 10/1000 µs peak impulse current of 16.4 A. This value is measured per JEDEC standards and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is the SMAJ15AH suitable for bidirectional transient protection?
No, the SMAJ15AH is a unidirectional TVS diode intended for DC line protection with defined polarity. For bidirectional applications such as AC lines or data bus protection, the SMAJ15CAH variant (with "CAH" suffix) must be used - it provides symmetrical clamping in both directions and is explicitly designated for bipolar operation in the datasheet.
Does the SMAJ15AH meet automotive qualification standards?
Yes, the SMAJ15AH is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements. Its construction includes glass-passivated junctions, JESD201 Class 2 whisker resistance, and J-STD-020 Level 1 moisture sensitivity - all verified for automotive under-hood and cabin applications.
What is the thermal derating behavior of the SMAJ15AH above 25°C ambient?
The SMAJ15AH's peak pulse power (400 W) is linearly derated above TA = 25°C per the manufacturer's Fig.2 curve - reducing to approximately 200 W at +100°C ambient. This derating ensures safe energy absorption without junction overheating, and must be applied when calculating worst-case surge margins in high-temperature enclosures.
Can the SMAJ15AH be used in place of the SMAJ15H in existing designs?
Yes, the SMAJ15AH replaces SMAJ15H with improved VBR tightness (16.7–18.5 V vs. 16.7–20.4 V), resulting in more consistent clamping onset and reduced variation in protected system margin. Both share identical package, pinout, and electrical ratings - making SMAJ15AH a drop-in upgrade with enhanced reliability.
SMAJ15AH 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ15AH FAQ
1.How can I place an order for SMAJ15AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ15AH 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 SMAJ15AH reliable?
The price and inventory of SMAJ15AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ15AH is usually 5 days.
3.What payment methods are accepted for SMAJ15AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ15AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ15AH?
SMAJ15AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ15AH 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 SMAJ15AH?
For technical support, including SMAJ15AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ15AH requirements.
6.How does Aetrix verify that SMAJ15AH is sourced from the original manufacturer or authorized distributors?
All SMAJ15AH 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 SMAJ15AH meets industry standards.
7.What is the process for return or replacement of SMAJ15AH?
All SMAJ15AH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ15AH, 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 SMAJ15AH part is unused and in its original packaging.
Return procedure for SMAJ15AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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