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Taiwan Semiconductor Corporation 1KSMB12CAH
- Part No.:
- 1KSMB12CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB12CAH.pdf
- Description:
- TVS DIODE 10.2VWM 16.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,416
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Product details
Overview
1KSMB12CAH from Taiwan Semiconductor is a bi-directional 1000W transient voltage suppressor (TVS) in DO-214AA (SMB) package, with breakdown voltage 11.4–12.6 V at 1 mA, stand-off voltage 10.2 V, max clamping voltage 16.7 V at 59.9 A, and AEC-Q101 qualification for automotive-grade surge protection.
For engineers reviewing the 1KSMB12CAH datasheet, 1KSMB12CAH pinout, 1KSMB12CAH application, or 1KSMB12CAH equivalent, key selection criteria include bidirectional clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, moisture sensitivity level 1 compliance, and surface-mount compatibility for automated placement in ESD- and load-switching-sensitive systems.
Technical Context
The 1KSMB12CAH operates as a bi-directional avalanche diode, leveraging glass-passivated junction technology to achieve sub-1 ps response time from 0 V to VBR(min). Its clamping behavior is defined by peak pulse power rating of 1000 W (10/1000 µs waveform), with thermal resistance RθJL = 20 °C/W enabling effective power dissipation during transients.
Designed for unidirectional and bidirectional configurations (CAH suffix denotes bi-directional), it supports steady-state power dissipation of 5 W at 25 °C ambient and withstands junction temperatures from –55 °C to +175 °C - critical for under-hood automotive electronics and industrial control interfaces exposed to inductive switching noise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 11.4 V / 12.6 V at 1 mA - defines reliable avalanche initiation threshold across process variation |
| VWM | 10.2 V - maximum continuous reverse operating voltage before leakage exceeds 5 µA |
| VC@IPP | 16.7 V at 59.9 A - clamped voltage during full-rated 1000 W transient, limiting downstream IC stress |
| PPPSM | 1000 W - peak pulse power handling per 10/1000 µs waveform, per IEC 61000-4-5 & ISO 7637-2 |
| TJ(max) | +175 °C - enables operation in high-temperature environments such as engine control units |
| Package | DO-214AA (SMB) - standardized surface-mount outline with 0.110 g mass and J-STD-002 solderability |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band (not applicable for bi-directional 1KSMB12CAH); meets UL 94V-0 flammability and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional avalanche junction terminals | No polarity marking required; identical clamping in both directions - simplifies PCB layout and eliminates orientation errors |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including temperature cycling, HTRB, and ESD |
| Glass passivated chip junction | Enhances long-term reliability and stability of breakdown voltage under humidity and thermal cycling |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Guarantees robustness against real-world vehicle electrical disturbances including battery disconnect and load dump |
| Moisture sensitivity level 1 | Enables standard SMT reflow without baking - reduces manufacturing overhead and risk of popcorning |
Applications
| Automotive Lighting Systems | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting LED driver ICs from load-dump transients during headlamp switching in 12 V vehicle architectures. IC Role / Device Role / Timing Role: Bi-directional TVS placed across power rail and ground to clamp both positive and negative spikes. Use Value: Limits voltage to ≤16.7 V during 59.9 A transients, preventing latch-up or gate oxide damage in MOSFET drivers. | Use Scenario: Safeguarding digital input modules from EFT bursts induced by relay coil de-energization in factory automation cabinets. IC Role / Device Role / Timing Role: Standoff protection device on 24 V DC input lines, responding within <1 ps to fast-rising noise. Use Value: Maintains 10.2 V stand-off while delivering 1000 W clamping capacity - compatible with IEC 61000-4-4 Level 4 immunity requirements. |
| Automotive Body Control Modules | Consumer Appliance Motor Drivers |
Use Scenario: Shielding LIN bus transceivers and microcontroller GPIOs from inductive kickback in seat/mirror actuator circuits. IC Role / Device Role / Timing Role: Bidirectional transient suppressor connected between signal line and chassis ground. Use Value: Symmetrical clamping ensures equal protection for rising/falling edge transients - essential for bidirectional serial buses. | Use Scenario: Suppressing back-EMF from brushed DC motors in washing machine control boards during commutation. IC Role / Device Role / Timing Role: Rail-to-rail TVS on motor supply line, absorbing energy from 1000 W inductive surges. Use Value: Withstands 175 °C junction temperature and meets RoHS/halogen-free standards for white goods compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12CA | Same DO-214AA package; VBR = 13.3–14.7 V, VC = 19.9 V @ 50.3 A - higher clamping voltage and lower peak current rating | Less margin for low-voltage 12 V systems where 16.7 V clamping is critical | Select when higher VBR tolerance is acceptable and legacy SMBJ footprint reuse is prioritized |
| 1.5KE12CA | Through-hole DO-15 package; same VBR range but 1500 W rating and slower thermal response - not surface-mountable | Requires PCB redesign; unsuitable for automated assembly or space-constrained layouts | Choose only for prototyping or legacy through-hole designs where reflow compatibility is not required |
Compared with SMBJ12CA and 1.5KE12CA, the 1KSMB12CAH delivers tighter VBR tolerance (11.4–12.6 V), lower clamping (16.7 V), and AEC-Q101 qualification - making it the preferred choice for production automotive and high-reliability industrial SMT applications requiring validated automotive-grade surge immunity.
Availability
1KSMB12CAH is available at Aetrix Electronics and suitable for automotive lighting systems, industrial PLC I/O protection, and body control module designs requiring stable component supply, AEC-Q101 compliance, and DO-214AA surface-mount form factor.
Supply support for 1KSMB12CAH 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 automotive-qualified components.
The 1KSMB series was developed specifically for high-power, surface-mount transient suppression in automotive and industrial environments - emphasizing AEC-Q101 reliability, ISO 7637-2 compliance, and automated assembly readiness.
FAQ
What does the 'CAH' suffix indicate in 1KSMB12CAH?
The 'CAH' suffix in 1KSMB12CAH explicitly denotes a bi-directional configuration - meaning the device provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike uni-directional variants (e.g., 1KSMB12AH), the 1KSMB12CAH has no polarity marking and functions identically regardless of terminal orientation, simplifying layout and eliminating installation errors in AC-coupled or bidirectional signal paths.
Is 1KSMB12CAH compliant with automotive reliability standards?
Yes, 1KSMB12CAH is AEC-Q101 qualified, having passed stress tests including high-temperature reverse bias (HTRB), temperature cycling, and electrostatic discharge per automotive electronics requirements. It also meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b specifications - confirming suitability for use in engine control units, body modules, and lighting systems in passenger vehicles and commercial trucks.
What is the maximum clamping voltage of 1KSMB12CAH under rated surge conditions?
The maximum clamping voltage (VC) of 1KSMB12CAH is 16.7 V when subjected to its peak pulse current of 59.9 A (10/1000 µs waveform). This value is measured at the device terminals and represents the upper limit of voltage seen by protected circuitry during a full-rated transient event - critical for ensuring downstream ICs remain within absolute maximum ratings.
Can 1KSMB12CAH be used in high-humidity environments?
Yes, 1KSMB12CAH is rated at Moisture Sensitivity Level 1 per J-STD-020, meaning it can be stored indefinitely at ≤30 °C/85 % RH without baking prior to reflow. Its glass-passivated junction and UL 94V-0 molding compound provide inherent resistance to moisture ingress and electrochemical migration - supporting reliable operation in humid under-hood or outdoor industrial enclosures.
Does 1KSMB12CAH require special PCB layout considerations?
No special layout is needed beyond standard high-current TVS practices: short, low-inductance traces to minimize voltage overshoot during fast transients; connection directly across protected node and ground plane; and avoidance of vias in the main current path. Because 1KSMB12CAH is bi-directional and DO-214AA packaged, no polarity alignment is required - reducing design complexity versus uni-directional alternatives.
1KSMB12CAH 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):
- 10.2V
- Voltage - Breakdown (Min):
- 11.4V
- Voltage - Clamping (Max) @ Ipp:
- 16.7V
- Current - Peak Pulse (10/1000µs):
- 59.9A
- 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)
1KSMB12CAH FAQ
1.How can I place an order for 1KSMB12CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB12CAH 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 1KSMB12CAH reliable?
The price and inventory of 1KSMB12CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB12CAH is usually 5 days.
3.What payment methods are accepted for 1KSMB12CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB12CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB12CAH?
1KSMB12CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB12CAH 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 1KSMB12CAH?
For technical support, including 1KSMB12CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB12CAH requirements.
6.How does Aetrix verify that 1KSMB12CAH is sourced from the original manufacturer or authorized distributors?
All 1KSMB12CAH 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 1KSMB12CAH meets industry standards.
7.What is the process for return or replacement of 1KSMB12CAH?
All 1KSMB12CAH units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB12CAH, 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 1KSMB12CAH part is unused and in its original packaging.
Return procedure for 1KSMB12CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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