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Taiwan Semiconductor Corporation SMBJ15AH
- Part No.:
- SMBJ15AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ15AH.pdf
- Description:
- TVS DIODE 15VWM 24.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,832
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Product details
Overview
SMBJ15AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, rated for 600W peak pulse power, 15V working stand-off voltage (VWM), and 24.4V maximum clamping voltage (VC) at 25.1A peak impulse current - designed to protect automotive and industrial power rails against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMBJ15AH datasheet, SMBJ15AH pinout, SMBJ15AH application, or SMBJ15AH equivalent, key selection criteria include clamping performance under 10/1000µs surge, low leakage (<1µA at 15V), AEC-Q101 qualification, and compatibility with automated SMT assembly on 12V–24V DC systems requiring robust ESD and load-dump immunity.
Technical Context
The SMBJ15AH operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its 16.7–18.5V breakdown range (VBR @ IT = 1mA). It features glass-passivated junction construction for stable VBR tolerance and low leakage, with thermal resistance RθJA = 55°C/W enabling reliable operation up to +150°C junction temperature.
Its fast response time (<1.0ps) ensures suppression before downstream ICs experience overvoltage stress, while compliance with ISO 7637-2 Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect/load dump), and Pulse 3a/3b (capacitive coupling) confirms suitability for automotive power line protection without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15 V - Maximum continuous reverse operating voltage before clamping begins; matches 12V automotive nominal systems with margin. |
| VBR min/max | 16.7 / 18.5 V @ 1 mA - Confirmed breakdown threshold ensures predictable turn-on during transients without premature conduction. |
| VC @ IPP | 24.4 V @ 25.1 A - Clamping voltage limits downstream voltage stress to safe levels during 10/1000µs surges. |
| PPK | 600 W - Peak pulse power rating defines maximum transient energy absorption capability per IEC 61000-4-5 and ISO 7637-2. |
| ID @ VWM | <1 µA - Ultra-low reverse leakage preserves system efficiency and prevents false triggers in high-impedance monitoring circuits. |
| Package | DO-214AA (SMB) - Standardized surface-mount outline compatible with IPC-7351B footprint and reflow profiles. |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band; weight ≈ 0.090 g; meets UL 94V-0 and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (non-banded end) | Forward current path / low-side reference | Connected to ground or low-voltage rail; enables unidirectional clamping from VCC to GND. |
| Cathode (banded end) | Transient voltage clamp node | Connected to protected line (e.g., 12V supply); conducts avalanche current during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock per JESD47. |
| Glass passivated junction | Ensures stable VBR tolerance and long-term leakage stability across -55°C to +150°C operating range. |
| Clamping voltage ≤24.4V | Keeps protected ICs (e.g., CAN transceivers, microcontrollers) within absolute maximum ratings during 10/1000µs surges. |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive kick), Pulse 2a/2b (load dump), and Pulse 3a/3b (fast transients) without external filtering. |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: 12V battery-fed ECU power input subjected to load dump (Pulse 2b) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and GND to clamp transients before they reach PMIC or MCU. Use Value: Limits voltage excursion to ≤24.4V during 10/1000µs 100V surges, preventing latch-up or gate oxide damage in downstream silicon. | Use Scenario: 24V DC digital input module exposed to inductive switching noise from solenoids and relays. IC Role / Device Role / Timing Role: TVS mounted at connector entry point to shunt fast transients before signal conditioning circuitry. Use Value: Sub-1ps response captures edge of 50ns EFT bursts (IEC 61000-4-4), reducing need for additional RC filtering stages. |
| LED Driver Overvoltage Clamp | USB-C Power Delivery Line Protection |
Use Scenario: Constant-current LED driver board powered from 12V vehicle bus with risk of back-EMF from motor loads. IC Role / Device Role / Timing Role: SMBJ15AH placed across input capacitor to absorb inductive spikes generated during ignition or HVAC actuation. Use Value: 600W peak power rating handles repetitive 10/1000µs pulses without degradation, extending board lifetime in harsh environments. | Use Scenario: USB-C PD controller supply rail (VCONN/VBUS) in automotive infotainment head unit. IC Role / Device Role / Timing Role: Unidirectional TVS on 5V/9V/15V PD negotiation lines to prevent ESD-induced communication failure. Use Value: <1µA leakage at 15V avoids interference with PD protocol signaling while clamping ±8kV contact ESD per IEC 61000-4-2. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ15A | Same VWM (15V), but higher VC = 26.9V @ 23.1A; no AEC-Q101 qualification. | Not suitable for automotive OEM designs requiring AEC-Q101; acceptable for industrial non-automotive use. | Select SMBJ15A only if AEC-Q101 is not required and higher clamping voltage is acceptable. |
| SAC15 | Same DO-214AA package, but bidirectional; VWM = 15V, VC = 28.0V @ 21.4A; AEC-Q101 qualified. | Supports AC-coupled or floating lines where polarity reversal may occur; clamps in both directions. | Choose SAC15 only when bidirectional protection is needed - e.g., data lines or ungrounded sensors. |
Compared with SMBJ15A and SAC15, the SMBJ15AH provides lower clamping voltage (24.4V vs. 26.9V/28.0V) and AEC-Q101 qualification in a unidirectional configuration optimized for 12V/24V DC power rail protection - making it the preferred choice for automotive body control modules and engine management systems.
Availability
SMBJ15AH is available at Aetrix Electronics and suitable for automotive electronics, industrial PLCs, LED lighting drivers, and USB-C power delivery systems requiring stable component supply with full traceability and lifecycle support.
Supply support for SMBJ15AH 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 SMBJH series was developed specifically for AEC-Q101-compliant automotive transient suppression, targeting 12V/24V power networks subject to ISO 7637-2 and IEC 61000-4-5 threats in ECUs, ADAS modules, and infotainment systems.
FAQ
What is the clamping voltage of SMBJ15AH and how is it measured?
The SMBJ15AH has a maximum clamping voltage (VC) of 24.4 V at a peak impulse current (IPP) of 25.1 A, tested with a 10/1000 µs waveform per IEC 61000-4-5. This value is guaranteed across temperature and represents the highest voltage seen at the device terminals during standardized surge events - critical for ensuring protected ICs remain within their absolute maximum ratings. The SMBJ15AH's low VC directly enables robust protection of 3.3V and 5V logic interfaces powered from 12V rails.
Is SMBJ15AH suitable for automotive applications?
Yes, SMBJ15AH is AEC-Q101 qualified and explicitly designed for automotive use, meeting ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements. Its glass-passivated junction, -55°C to +150°C operating range, and moisture sensitivity level 1 (per J-STD-020) ensure reliability in under-hood and cabin environments. The SMBJ15AH is commonly deployed in body control modules, lighting controllers, and telematics units where load-dump and ESD immunity are mandatory.
What is the difference between SMBJ15AH and SMBJ15H?
SMBJ15AH offers tighter breakdown voltage tolerance (16.7–18.5 V) versus SMBJ15H (16.7–20.4 V), resulting in more consistent clamping behavior and lower VC (24.4 V vs. 26.9 V). Both share the same 15 V VWM and DO-214AA package, but SMBJ15AH's enhanced VBR uniformity improves design margin in safety-critical automotive systems. The SMBJ15AH also maintains identical AEC-Q101 qualification and ISO 7637-2 compliance as SMBJ15H.
Does SMBJ15AH require a heatsink in typical applications?
No, SMBJ15AH does not require an external heatsink in standard applications because its 600W peak pulse rating applies to single, non-repetitive events - not continuous power dissipation. With a steady-state power dissipation (PD) of only 3 W and RθJA = 55°C/W, PCB copper area (≥1 cm² per pad) provides sufficient thermal relief for transient duty cycles. The SMBJ15AH's thermal performance is validated for operation up to +150°C junction temperature without forced cooling.
Can SMBJ15AH be used in bidirectional configurations?
No, SMBJ15AH is a unidirectional TVS diode and must be connected with cathode to the protected line and anode to ground. For bidirectional protection, TSC offers the SAC15 (bidirectional, AEC-Q101 qualified) or SMBJ15CAH (if available), which clamps symmetrically in both polarities. Using SMBJ15AH in reverse-biased mode risks permanent damage due to lack of forward surge rating in that direction - always verify polarity alignment in schematic and layout for the SMBJ15AH.
SMBJ15AH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJH
- 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):
- 25.1A
- Power - Peak Pulse:
- 600W
- 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-214AA (SMB)
SMBJ15AH FAQ
1.How can I place an order for SMBJ15AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ15AH 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 SMBJ15AH reliable?
The price and inventory of SMBJ15AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ15AH is usually 5 days.
3.What payment methods are accepted for SMBJ15AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ15AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ15AH?
SMBJ15AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ15AH 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 SMBJ15AH?
For technical support, including SMBJ15AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ15AH requirements.
6.How does Aetrix verify that SMBJ15AH is sourced from the original manufacturer or authorized distributors?
All SMBJ15AH 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 SMBJ15AH meets industry standards.
7.What is the process for return or replacement of SMBJ15AH?
All SMBJ15AH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ15AH, 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 SMBJ15AH part is unused and in its original packaging.
Return procedure for SMBJ15AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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