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Taiwan Semiconductor Corporation 1KSMB15CAH
- Part No.:
- 1KSMB15CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB15CAH.pdf
- Description:
- TVS DIODE 12.8VWM 21.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,138
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Product details
Overview
1KSMB15CAH from Taiwan Semiconductor is a bi-directional 1000W transient voltage suppressor (TVS) in DO-214AA (SMB) package, with breakdown voltage 14.3–15.8 V at 1 mA, stand-off voltage 12.8 V, clamping voltage 21.2 V at 47.2 A, and AEC-Q101 qualification for automotive-grade surge protection.
For engineers reviewing the 1KSMB15CAH datasheet, 1KSMB15CAH pinout, 1KSMB15CAH application, or 1KSMB15CAH equivalent, key selection criteria include bidirectional clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, moisture sensitivity level 1, and compatibility with automated SMT placement on PCBs requiring robust ESD and inductive-switching transient immunity.
Technical Context
The 1KSMB15CAH implements a glass-passivated silicon junction optimized for fast response (<1.0 ps from 0 V to VBR,min) and low clamping ratio (VC/VBR,min ≈ 1.49). It operates across –55°C to +175°C junction temperature range and meets JESD201 Class 2 whisker resistance.
Designed for unidirectional and bidirectional configurations (CAH suffix denotes bi-directional), it delivers 1000 W peak pulse power (10/1000 µs waveform), 5 W steady-state dissipation, and 20°C/W junction-to-lead thermal resistance - enabling direct PCB-mount protection without heatsinking in space-constrained automotive modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR min/max | 14.3 V / 15.8 V - defines minimum and maximum voltage at which device enters avalanche conduction under 1 mA test current |
| VWM | 12.8 V - maximum continuous reverse operating voltage before leakage exceeds 5 µA |
| VC @ IPP | 21.2 V at 47.2 A - clamping voltage during 10/1000 µs transient, limiting downstream IC stress |
| PPPSM | 1000 W - peak pulse power handling capability per single 10/1000 µs surge event |
| TJ max | +175°C - enables operation in under-hood automotive environments without derating |
| Package | DO-214AA (SMB) - surface-mount outline with 0.110 g mass, UL 94V-0 molding, matte tin leads |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with cathode band marking; dual terminals (anode/cathode) symmetrically arranged for bi-directional operation; polarity marked via band - no dedicated anode/cathode designation required for CAH variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Transient current entry point (reverse bias) | Accepts positive-going transients relative to cathode; symmetrical with cathode for bidirectional clamping |
| Cathode (banded end) | Transient current entry point (reverse bias) | Accepts negative-going transients relative to anode; functionally identical to anode in CAH configuration |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including temperature cycling, HTRB, and ESD |
| Glass passivated junction | Enhances long-term reliability and stability of breakdown voltage under thermal and humidity stress |
| Fast response time <1.0 ps | Clamps transients before sensitive logic or analog circuitry sustains damage |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Meets full suite of automotive electrical disturbance immunity standards for 12 V systems |
| Moisture sensitivity level 1 | Allows unlimited floor life and standard reflow without baking preconditioning |
Applications
| Automotive Infotainment Power Rails | LED Headlamp Driver Protection |
|---|---|
Use Scenario: Protecting USB-C, CAN FD, and display interface power inputs in head unit ECUs exposed to load dump and jump-start surges. IC Role / Device Role / Timing Role: Bi-directional TVS placed at board-level input filter stage to clamp ±100 V transients before DC-DC converters. Use Value: Limits voltage to ≤21.2 V during 47.2 A surge, preserving 12 V rail integrity and preventing brownout-induced MCU resets. | Use Scenario: Safeguarding constant-current LED driver ICs against inductive kickback from relay-controlled high-beam switching. IC Role / Device Role / Timing Role: Parallel-connected TVS across driver output to absorb 1000 W energy spikes within <1 ps. Use Value: Prevents gate oxide rupture in MOSFET drivers by clamping transients before VDS exceeds 30 V rating. |
| Industrial PLC Digital I/O Modules | Automotive Body Control Module (BCM) Sensors |
Use Scenario: Shielding 24 V digital input channels from EFT bursts and field-wiring induced noise in factory automation cabinets. IC Role / Device Role / Timing Role: Standoff-rated TVS (12.8 V) on each channel's signal line, referenced to local ground plane. Use Value: Maintains signal integrity below 5 µA leakage at 12.8 V while surviving repeated 4 kV EFT bursts per IEC 61000-4-4. | Use Scenario: Protecting LIN bus transceivers and Hall-effect position sensors from battery disconnect transients in door latch assemblies. IC Role / Device Role / Timing Role: Bidirectional clamping element between sensor supply and ground, rated for –55°C to +175°C operation. Use Value: Ensures sensor functionality remains intact after exposure to ISO 7637-2 Pulse 3b (50 V, 100 ns rise) without latch-up or parametric shift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ15CA | Same DO-214AA package, identical VBR (14.3–15.8 V), but lower PPPSM = 600 W | Limited to lower-energy transients; not suitable for ISO 7637-2 Pulse 1 (load dump) | Select 1KSMB15CAH when full 1000 W surge immunity is required in automotive front-end designs |
| 1.5KE15CA | Higher PPPSM = 1500 W but axial DO-15 package; slower response (~1.5 ps); no AEC-Q101 qualification | Requires through-hole mounting; unsuitable for automated SMT lines or under-hood thermal profiles | Choose 1KSMB15CAH for surface-mount, AEC-Q101-compliant, high-reliability automotive PCBs |
Compared with SMBJ15CA and 1.5KE15CA, the 1KSMB15CAH uniquely combines 1000 W surge rating, AEC-Q101 qualification, DO-214AA SMT compatibility, and sub-1 ps response - making it the only option meeting full ISO 7637-2 immunity in compact automotive control units.
Availability
1KSMB15CAH is available at Aetrix Electronics and suitable for automotive infotainment systems, LED lighting controllers, industrial PLC I/O modules, and body control module sensor interfaces requiring stable component supply across extended production lifecycles.
Supply support for 1KSMB15CAH 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 automotive-qualified components.
The 1KSMBxxCAH series was developed specifically for AEC-Q101-compliant, high-power transient suppression in 12 V and 24 V automotive subsystems - emphasizing reliability, fast clamping, and SMT manufacturability.
FAQ
What does the "CAH" suffix indicate in 1KSMB15CAH?
The "CAH" suffix in 1KSMB15CAH designates a bi-directional configuration, meaning the device provides symmetrical clamping for both positive and negative transients without polarity dependency. This differs from "AH" variants, which are unidirectional and require correct anode/cathode orientation. The CAH version uses identical terminals for both directions, simplifying layout in differential or AC-coupled protection paths.
Is 1KSMB15CAH compliant with automotive reliability standards?
Yes, 1KSMB15CAH is AEC-Q101 qualified, having passed stress tests including high-temperature reverse bias (HTRB), temperature cycling, and electrostatic discharge per JESD22-A114. It also meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive electrical disturbances and carries moisture sensitivity level 1 per J-STD-020 - confirming suitability for under-hood and safety-critical vehicle systems.
What is the maximum clamping voltage of 1KSMB15CAH during a surge event?
The maximum clamping voltage of 1KSMB15CAH is 21.2 V when subjected to its rated peak pulse current of 47.2 A (10/1000 µs waveform). This value is measured at the device terminals and represents the upper limit of voltage seen by downstream circuitry during worst-case transient events, ensuring protected ICs remain within safe operating voltage margins.
Can 1KSMB15CAH be used in place of a unidirectional TVS like 1KSMB15AH?
No - 1KSMB15CAH is bi-directional and cannot replace 1KSMB15AH in circuits requiring unidirectional forward conduction or DC blocking. While both share identical VBR and VC specs, the 1KSMB15AH allows forward current flow (VF = 3.5 V @ 50 A), whereas the 1KSMB15CAH blocks in both directions. Substitution requires verifying system-level polarity and conduction requirements.
What is the thermal resistance profile of 1KSMB15CAH?
1KSMB15CAH has a junction-to-lead thermal resistance (RθJL) of 20°C/W and junction-to-ambient resistance (RθJA) of 100°C/W at TA = 25°C. These values enable effective heat dissipation through PCB copper pours and allow operation up to +175°C junction temperature without external heatsinking - critical for sustained surge duty in engine bay modules.
1KSMB15CAH 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:
- -
- Bidirectional Channels:
- 1
- 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)
1KSMB15CAH FAQ
1.How can I place an order for 1KSMB15CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB15CAH 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 1KSMB15CAH reliable?
The price and inventory of 1KSMB15CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB15CAH is usually 5 days.
3.What payment methods are accepted for 1KSMB15CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB15CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB15CAH?
1KSMB15CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB15CAH 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 1KSMB15CAH?
For technical support, including 1KSMB15CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB15CAH requirements.
6.How does Aetrix verify that 1KSMB15CAH is sourced from the original manufacturer or authorized distributors?
All 1KSMB15CAH 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 1KSMB15CAH meets industry standards.
7.What is the process for return or replacement of 1KSMB15CAH?
All 1KSMB15CAH units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB15CAH, 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 1KSMB15CAH part is unused and in its original packaging.
Return procedure for 1KSMB15CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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