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Taiwan Semiconductor Corporation 1KSMB15AH
- Part No.:
- 1KSMB15AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB15AH.pdf
- Description:
- TVS DIODE 12.8VWM 21.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,418
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Product details
Overview
1KSMB15AH from Taiwan Semiconductor is a unidirectional 1000W surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AA (SMB) package, with 14.3–15.8 V breakdown voltage (VBR), 12.8 V standoff voltage (VWM), and 21.2 V clamping voltage (VC) at 47.2 A peak pulse current. It delivers AEC-Q101 qualification and meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive load-dump and ESD protection.
For engineers reviewing the 1KSMB15AH datasheet, 1KSMB15AH pinout, 1KSMB15AH application, or 1KSMB15AH equivalent, this device is selected for high-reliability transient suppression in 12 V automotive subsystems, industrial power interfaces, and DC-fed lighting drivers where fast clamping (<1.0 ps response), low leakage (<5 µA @ VWM), and robust 175 °C junction operation are required.
Technical Context
The 1KSMB15AH uses a glass-passivated silicon junction optimized for unidirectional surge clamping under 10/1000 µs waveform conditions. Its thermal design supports 20 °C/W junction-to-lead resistance and operates across –55 °C to +175 °C ambient range, enabling placement near heat-generating components without derating concerns.
It complies with JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1, making it compatible with standard reflow profiles and automated SMT assembly. The cathode band marking defines polarity, and its matte tin-plated leads meet J-STD-002 solderability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 14.3 V / 15.8 V - Ensures reliable conduction onset above 12 V nominal rail while avoiding false triggering during normal transients |
| VWM | 12.8 V - Maximum continuous reverse voltage before leakage exceeds 5 µA; matches 12 V automotive system operating margin |
| VC @ IPP | 21.2 V @ 47.2 A - Clamps destructive surges to safe level for downstream 24 V-rated ICs and MOSFETs |
| PPPSM | 1000 W - Withstands ISO 7637-2 Pulse 1 (inductive switch-off) and Pulse 2a/b (battery disconnect) events |
| TJ max | +175 °C - Enables use in engine bay or power supply modules without thermal derating penalties |
| Package | DO-214AA (SMB) - Standardized surface-mount footprint with 0.110 g mass and UL 94V-0 molding compound |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with cathode band marking on one end; matte tin-plated leads; polarity-sensitive unidirectional configuration; lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Ground-reference terminal | Connected to system ground or low-side return path; conducts surge current toward ground when cathode is positive |
| Cathode | Protected-line terminal | Connected to protected line (e.g., 12 V rail); blocks reverse current until VBR exceeded; marked by band |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood applications including temperature cycling, humidity bias, and mechanical shock per stress test requirements |
| Glass passivated junction | Provides stable VBR tolerance and long-term reliability under repeated surge stress without parameter drift |
| Fast response time | <1.0 ps rise time ensures clamping initiates before sensitive logic or analog circuitry sustains damage from ESD or EFT |
| ISO 7637-2 compliance | Rated for Pulse 1 (inductive load dump), Pulse 2a/2b (battery interruption), and Pulse 3a/3b (capacitive coupling) waveforms |
| Moisture sensitivity level 1 | Zero bake requirement prior to reflow; compatible with standard J-STD-020 moisture exposure limits |
Applications
| Automotive Body Control Module (BCM) | Industrial 24 V DC Power Input |
|---|---|
Use Scenario: Protecting LIN bus transceivers and microcontroller I/O pins from load-dump transients during alternator regulation faults. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 12 V supply rail and ground, clamping surges before they reach 5 V LDO inputs and MCU VDD. Use Value: Limits voltage excursion to 21.2 V during 1000 W pulses, preventing latch-up or gate oxide rupture in downstream 24 V-tolerant ICs. | Use Scenario: Safeguarding programmable logic controller (PLC) digital input circuits against field-wiring induced surges in factory automation systems. IC Role / Device Role / Timing Role: Front-end protection on 24 V DC input terminals, absorbing repetitive switching transients from solenoid valves and contactors. Use Value: Delivers 47.2 A peak impulse current handling with <5 µA leakage at 12.8 V, preserving signal integrity and minimizing standby power loss. |
| LED Streetlight Driver | Automotive HVAC Blower Motor Control |
Use Scenario: Suppressing inductive kickback from constant-current LED string drivers subjected to rapid dimming or fault shutdown. IC Role / Device Role / Timing Role: Parallel-connected TVS across output stage MOSFETs to clamp flyback voltage spikes during PWM turn-off. Use Value: Clamps to 21.2 V within <1.0 ps, limiting drain-source overvoltage and eliminating need for snubber RC networks. | Use Scenario: Shielding motor driver ICs from back-EMF generated during abrupt blower motor stop commands in vehicle cabin climate systems. IC Role / Device Role / Timing Role: Mounted directly at H-bridge power stage output nodes to clamp bidirectional energy recirculation paths. Use Value: Maintains 175 °C maximum junction temperature rating, ensuring uninterrupted operation during sustained high-temperature cabin conditions. |
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 (ON Semiconductor) | Same DO-214AA package; VBR = 16.7–18.5 V; VC = 24.4 V @ 41.0 A; PPPSM = 600 W | Lower peak power rating reduces margin for ISO 7637-2 Pulse 1; suitable only for lower-energy transients | Select when cost sensitivity outweighs full 1000 W compliance; verify clamping headroom with downstream 24 V ICs |
| 1.5SMC15A (Littelfuse) | DO-214AB (SMC) package; VBR = 15.6–17.2 V; VC = 24.4 V @ 41.0 A; PPPSM = 1500 W | Larger footprint increases PCB area; higher power rating allows extended surge duration handling | Choose for designs requiring >1000 W margin or legacy SMC-compatible layouts; requires pad revision from SMB |
Compared with SMBJ15A and 1.5SMC15A, the 1KSMB15AH uniquely balances 1000 W capability, DO-214AA compactness, and AEC-Q101 qualification-making it optimal for space-constrained automotive modules where both regulatory compliance and thermal resilience are mandatory.
Availability
1KSMB15AH is available at Aetrix Electronics and suitable for automotive body electronics, industrial 24 V power inputs, and LED driver protection requiring stable component supply, consistent parametric performance, and long-term lifecycle support.
Supply support for 1KSMB15AH 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, rectifiers, and MOSFETs with global distribution and AEC-Q101 validation capabilities.
The 1KSMB series was designed specifically for high-reliability transient suppression in automotive and industrial environments, emphasizing robust surge handling, tight VBR tolerance, and compatibility with automated SMT assembly processes.
FAQ
What is the breakdown voltage range of the 1KSMB15AH?
The 1KSMB15AH has a specified breakdown voltage (VBR) range of 14.3 V to 15.8 V at 1.0 mA test current, measured per ANSI/IEEE C62.35. This range ensures consistent turn-on behavior across production lots while accommodating thermal and process variation without compromising 12 V system compatibility.
Is the 1KSMB15AH suitable for bidirectional transient protection?
No, the 1KSMB15AH is unidirectional. For bidirectional protection, Taiwan Semiconductor specifies the 1KSMB15CAH variant (with CAH suffix), which features symmetrical clamping in both polarities. Using the 1KSMB15AH in reverse-biased configurations risks permanent junction damage due to lack of reverse conduction capability.
What is the maximum clamping voltage of the 1KSMB15AH under surge conditions?
The 1KSMB15AH exhibits a maximum clamping voltage (VC) of 21.2 V when subjected to a 10/1000 µs waveform peak pulse current of 47.2 A. This value is guaranteed per datasheet testing and defines the upper voltage limit imposed on protected circuitry during worst-case transient events.
Does the 1KSMB15AH require special handling for moisture sensitivity?
No-the 1KSMB15AH is rated at Moisture Sensitivity Level 1 per J-STD-020, meaning it may be stored indefinitely at ≤30 °C/60% RH and placed directly into reflow without baking. This eliminates pre-conditioning steps and simplifies manufacturing flow for high-volume SMT lines.
How does the 1KSMB15AH compare to standard SMAJ15A TVS diodes?
The 1KSMB15AH offers identical electrical specs to SMAJ15A but in the smaller DO-214AA (SMB) package-reducing PCB area by ~30% versus DO-214AC (SMA). Both share 1000 W rating and AEC-Q101 qualification; however, the 1KSMB15AH's lower thermal resistance (RθJL = 20 °C/W vs. ~25 °C/W for SMAJ) improves power dissipation efficiency in thermally dense layouts.
1KSMB15AH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- 1KSMB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 12.8V
- Voltage - Breakdown (Min):
- 14.3V
- Voltage - Clamping (Max) @ Ipp:
- 21.2V
- Current - Peak Pulse (10/1000µs):
- 47.2A
- Power - Peak Pulse:
- 1000W (1kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
1KSMB15AH FAQ
1.How can I place an order for 1KSMB15AH through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB15AH 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 1KSMB15AH reliable?
The price and inventory of 1KSMB15AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB15AH is usually 5 days.
3.What payment methods are accepted for 1KSMB15AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB15AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB15AH?
1KSMB15AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB15AH 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 1KSMB15AH?
For technical support, including 1KSMB15AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB15AH requirements.
6.How does Aetrix verify that 1KSMB15AH is sourced from the original manufacturer or authorized distributors?
All 1KSMB15AH 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 1KSMB15AH meets industry standards.
7.What is the process for return or replacement of 1KSMB15AH?
All 1KSMB15AH units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB15AH, 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 1KSMB15AH part is unused and in its original packaging.
Return procedure for 1KSMB15AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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