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Taiwan Semiconductor Corporation SMAJ15H
- Part No.:
- SMAJ15H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ15H.pdf
- Description:
- TVS DIODE 15VWM 26.9VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,708
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Product details
Overview
SMAJ15H from Taiwan Semiconductor is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, with 15V working stand-off voltage (VWM), 16.7–20.4V breakdown voltage (VBR), and 26.9V clamping voltage (VC) at 14.9A 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 SMAJ15H datasheet, SMAJ15H pinout, SMAJ15H application, or SMAJ15H equivalent, this page provides verified electrical parameters, clamping performance under 10/1000μs surge, thermal derating behavior, polarity marking, and direct alternatives for automotive DC/DC converters, SMPS, and lighting systems requiring robust ESD and load-dump immunity.
Technical Context
The SMAJ15H operates as a unidirectional avalanche diode, activated when reverse voltage exceeds its VBR range (16.7–20.4V @ 1mA). Its glass-passivated junction enables fast response (<1.0ps rise to VBR) and low leakage (<1μA @ 15V), critical for protecting sensitive downstream circuitry during transients.
It sustains 400W peak pulse power per 10/1000μs waveform up to TA = 25°C, derating linearly above that temperature per Fig.2, with maximum junction temperature of 150°C and storage range from –55°C to +150°C - enabling use in under-hood automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 16.7 V / 20.4 V @ 1 mA - Confirmed breakdown threshold range defining turn-on consistency |
| VC @ IPPM | 26.9 V @ 14.9 A - Clamped voltage during 10/1000μs surge, limiting stress on protected ICs |
| PPPM | 400 W - Peak pulse power handling capability, sufficient for ISO 7637-2 Pulse 1 (inductive switch-off) |
| IR @ VWM | <1 μA - Ultra-low reverse leakage ensures minimal standby power loss in battery-critical systems |
| TJ max | +150 °C - Enables placement near heat sources in automotive ECUs and LED drivers |
Pinout & Package
DO-214AC (SMA) surface-mount package with cathode band marking on one end; matte tin-plated leads compliant with J-STD-002 solderability and JESD201 Class 2 whisker resistance; UL 94V-0 molding compound; weight ≈ 0.060 g.
| 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 (marked band) | 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 testing per JEDEC standards |
| Glass passivated junction | Ensures stable VBR tolerance and long-term leakage stability across humidity and thermal stress |
| Fast response time <1.0 ps | Clamps transients before propagation into sensitive analog or digital circuitry (e.g., CAN transceivers, microcontrollers) |
| Meets ISO 7637-2 Pulse 1/2a/2b/3a/3b | Provides system-level compliance for 12V/24V vehicle power networks without additional filtering stages |
Applications
| Automotive Body Control Module (BCM) | LED Headlamp Driver |
|---|---|
Use Scenario: Protects LIN bus interface and power inputs against load dump and jump-start surges in BCMs. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 12V supply rail and ground, clamping transients before they reach MCU power pins or LIN transceiver VCC. Use Value: Limits VC to 26.9V during 10/1000μs pulses, keeping protected ICs within absolute maximum ratings while maintaining AEC-Q101 compliance. | Use Scenario: Shields constant-current LED driver ICs from switching noise and battery reversal events in adaptive headlamps. IC Role / Device Role / Timing Role: Mounted at input stage of buck converter, absorbing repetitive 400W pulses from inductive kickback and alternator ripple. Use Value: With 15V VWM, it remains non-conducting during normal 13.5–14.5V operation yet triggers reliably at ≥16.7V, preserving efficiency and thermal margin. |
| Industrial SMPS Input Stage | On-board DC/DC Converter (12V→3.3V) |
Use Scenario: Guards primary-side controller and bulk capacitor from AC line surges and lightning-induced transients in DIN-rail power supplies. IC Role / Device Role / Timing Role: Placed across bridge rectifier output, clamping positive-going spikes before they stress MOSFET gate drivers or PWM controllers. Use Value: 400W PPPM rating supports IEC 61000-4-5 Level 3 (2kV) surge immunity without derating at 25°C ambient. | Use Scenario: Secures secondary-side LDO or buck regulator input in automotive infotainment modules exposed to battery transients. IC Role / Device Role / Timing Role: Positioned upstream of DC/DC IC's VIN pin, diverting energy from ISO 7637-2 Pulse 2b (battery interruption) events. Use Value: Sub-1μA leakage at 15V prevents measurable quiescent current increase in always-on domains, supporting low-power sleep modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ15AH | Narrower VBR range (16.7–18.5V vs. 16.7–20.4V); same VWM, VC, and PPPM | Better VBR consistency for designs requiring tighter clamping onset control | Select SMAJ15AH when statistical VBR distribution must be minimized across production lots. |
| SMBJ15H | Same VWM/VBR/VC specs but in larger DO-214AA (SMB) package; 600W PPPM | Higher surge margin and improved thermal dissipation for high-reliability industrial power rails | Choose SMBJ15H where board space permits and >400W single-pulse robustness is required. |
Compared with SMAJ15AH, the SMAJ15H offers wider VBR tolerance for cost-sensitive automotive modules; versus SMBJ15H, it trades peak power for compact DO-214AC footprint - making SMAJ15H optimal for space-constrained, AEC-Q101-compliant 12V rail protection.
Availability
SMAJ15H is available at Aetrix Electronics and suitable for automotive body electronics, LED lighting drivers, and industrial SMPS requiring stable component supply with full traceability and AEC-Q101 documentation support.
Supply support for SMAJ15H 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 AEC-Q101-compliant transient suppression in 12V/24V automotive subsystems, balancing compact size, high surge capability, and production-grade parametric consistency.
FAQ
What is the clamping voltage of SMAJ15H under standard 10/1000μs surge conditions?
The SMAJ15H has a maximum clamping voltage (VC) of 26.9 V at 14.9 A peak pulse current under the standardized 10/1000μs waveform. This value is measured per Fig.5 in the official Taiwan Semiconductor datasheet (Version A2102) and defines the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream ICs remain within their absolute maximum ratings. The SMAJ15H maintains this clamping performance across its specified operating temperature range.
Is SMAJ15H suitable for bidirectional transient protection?
No, SMAJ15H is a unidirectional TVS diode intended for protection against positive-going transients on DC lines referenced to ground. For bidirectional applications (e.g., data lines or AC-coupled signals), Taiwan Semiconductor specifies variants with CH or CAH suffixes (e.g., SMAJ15CH). Using SMAJ15H in reverse-biased configurations risks permanent damage due to lack of symmetrical avalanche structure - always confirm polarity alignment per the cathode band marking on the DO-214AC package.
Does SMAJ15H meet automotive qualification standards?
Yes, SMAJ15H is AEC-Q101 qualified and explicitly tested to meet ISO 7637-2 Pulse 1 (inductive switch-off), Pulse 2a/2b (battery interruption), and Pulse 3a/3b (capacitive coupling) requirements. Its construction - including glass-passivated junction, J-STD-020 Level 1 moisture sensitivity, and JESD201 Class 2 whisker resistance - satisfies automotive electronics reliability mandates. Documentation for SMAJ15H includes full AEC-Q101 test reports and PPAP-ready manufacturing records.
What is the maximum steady-state power dissipation for SMAJ15H?
The SMAJ15H has a steady-state power dissipation (PD) rating of 1 W at 25°C ambient temperature, as defined in the Absolute Maximum Ratings table. This value applies only to continuous DC or low-frequency reverse bias conditions - not transient events. In practical design, sustained reverse voltage near VWM (15 V) results in sub-1μA leakage, yielding negligible power (≤15 μW); therefore, thermal design focuses on transient energy absorption rather than DC thermal management. Derating curves (Fig.2) apply exclusively to pulsed power, not PD.
How does SMAJ15H compare to SMAJ15AH in terms of breakdown voltage tolerance?
SMAJ15H has a VBR range of 16.7–20.4 V at 1 mA test current, while SMAJ15AH tightens this to 16.7–18.5 V - reducing the upper bound by 1.9 V. Both share identical VWM (15 V), VC (26.9 V), and PPPM (400 W), meaning the difference lies solely in production binning control. Designs requiring predictable clamping onset - such as those with narrow voltage margins between VWM and IC absolute maximum ratings - benefit from SMAJ15AH's tighter VBR spread, whereas SMAJ15H offers broader process latitude for cost-optimized automotive modules.
SMAJ15H 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:
- 26.9V
- Current - Peak Pulse (10/1000µs):
- 14.9A
- 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)
SMAJ15H FAQ
1.How can I place an order for SMAJ15H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ15H 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 SMAJ15H reliable?
The price and inventory of SMAJ15H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ15H is usually 5 days.
3.What payment methods are accepted for SMAJ15H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ15H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ15H?
SMAJ15H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ15H 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 SMAJ15H?
For technical support, including SMAJ15H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ15H requirements.
6.How does Aetrix verify that SMAJ15H is sourced from the original manufacturer or authorized distributors?
All SMAJ15H 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 SMAJ15H meets industry standards.
7.What is the process for return or replacement of SMAJ15H?
All SMAJ15H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ15H, 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 SMAJ15H part is unused and in its original packaging.
Return procedure for SMAJ15H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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