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Taiwan Semiconductor Corporation 1KSMB24CAH
- Part No.:
- 1KSMB24CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB24CAH.pdf
- Description:
- TVS DIODE 20.5VWM 33.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,078
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Product details
Overview
1KSMB24CAH from Taiwan Semiconductor is a bi-directional surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AA (SMB) package, rated for 1000W peak pulse power, 22.8V–25.2V breakdown voltage (VBR), and 33.2V maximum clamping voltage (VC@IPP). It protects automotive and industrial circuits against ISO 7637-2 pulses and ESD transients.
For engineers reviewing the 1KSMB24CAH datasheet, 1KSMB24CAH pinout, 1KSMB24CAH application, or 1KSMB24CAH equivalent, key selection criteria include bi-directional clamping capability, AEC-Q101 qualification, 1.0ps response time, moisture sensitivity level 1, and compliance with IEC 61249-2-21 halogen-free requirements.
Technical Context
The 1KSMB24CAH is a single-die, bi-directional TVS diode designed to clamp transient overvoltages in both polarities without requiring external polarity management. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low leakage (<1.0 µA at VWM = 20.5V).
It delivers 30.1A peak impulse current (IPP) under 10/1000µs waveform while maintaining clamping at ≤33.2V - enabling robust protection of 24V automotive ECUs, CAN bus interfaces, and sensor signal lines against load dump and EFT events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 22.8V / 25.2V - defines reliable conduction onset range for bidirectional surge suppression |
| VWM | 20.5V - maximum continuous reverse operating voltage before leakage exceeds 1.0 µA |
| VC@IPP | 33.2V - clamped voltage during 30.1A 10/1000µs transient, limiting stress on downstream ICs |
| PPPSM | 1000W - peak pulse power handling per single non-repetitive event |
| IPP | 30.1A - maximum surge current supported at rated clamping voltage |
| TJ max | +175°C - enables operation in under-hood automotive environments |
| Package | DO-214AA (SMB) - industry-standard surface-mount outline compatible with automated placement |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band (bi-directional symmetry means no functional anode/cathode distinction; marking band denotes terminal 1 per JEDEC standard).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 (marked end) | Anode/Cathode reference point | Bi-directional device: symmetric terminals; marking band identifies lead 1 for orientation consistency in layout and assembly |
| Terminal 2 (unmarked end) | Complementary terminal | Electrically identical to Terminal 1; forms bidirectional clamping path across both polarities |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HAST, and mechanical shock per JESD22 |
| Glass passivated junction | Ensures stable VBR and low leakage over lifetime, even under humidity and thermal stress |
| Response time <1.0 ps | Clamps transients before propagation into protected ICs - critical for CAN, LIN, and sensor interface protection |
| Meets ISO 7637-2 Pulse 1/2a/2b/3a/3b | Validated for automotive supply-line transient immunity, including load dump and inductive switching spikes |
| Halogen-free & RoHS compliant | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green manufacturing |
Applications
| Automotive Body Control Module (BCM) | Industrial CAN Bus Node |
|---|---|
Use Scenario: Protecting microcontroller I/O and power rails from load dump and alternator ripple in 24V BCMs. IC Role / Device Role / Timing Role: Bi-directional voltage clamp placed at power input and signal line entry points. Use Value: Limits transient voltage to ≤33.2V during 30.1A surges, preventing latch-up or gate oxide damage in 3.3V/5V logic. | Use Scenario: Shielding CAN transceivers from EFT bursts and cable-induced surges in factory automation nodes. IC Role / Device Role / Timing Role: Low-capacitance TVS placed differential across CAN_H/CAN_L lines near connector. Use Value: Clamps common-mode transients without distorting 1Mbps CAN signaling due to fast <1.0ps response and minimal parasitic capacitance. |
| LED Headlamp Driver Circuit | Smart Sensor Interface (e.g., ABS wheel speed) |
Use Scenario: Safeguarding MOSFET gate drivers and current-sense amplifiers from inductive kickback in high-current LED drivers. IC Role / Device Role / Timing Role: Parallel-connected TVS across driver output and supply pins. Use Value: Absorbs 1000W pulses while holding clamping voltage below MOSFET VDS rating, avoiding avalanche failure. | Use Scenario: Protecting analog front-end inputs of wheel speed sensors exposed to road-induced ESD and magnetic coupling. IC Role / Device Role / Timing Role: Bi-directional TVS on sensor signal line between connector and conditioning amplifier. Use Value: Maintains signal integrity with <1.0 µA leakage at 20.5V stand-off, ensuring accurate low-level AC signal detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24CA | Same DO-214AA package, identical VBR (22.8–25.2V), but lower PPPSM = 600W and higher VC = 38.9V | Less margin for high-energy transients like ISO 7637-2 Pulse 5a (load dump); suitable only for lower-risk 24V sub-systems | Select when cost sensitivity outweighs need for full 1000W surge headroom |
| 1.5SMC24CA | Higher power (1500W), larger DO-214AB (SMC) package, same VBR/VC specs, but not footprint-compatible | Requires PCB redesign; preferred where system-level surge testing exceeds 1000W requirements | Choose only if validated test data shows >1000W transient exposure and layout allows SMC footprint |
Compared with SMBJ24CA and 1.5SMC24CA, the 1KSMB24CAH uniquely balances 1000W surge capacity, SMB footprint compatibility, AEC-Q101 qualification, and ISO 7637-2 compliance - making it optimal for space-constrained, automotive-grade 24V node protection without board rework.
Availability
1KSMB24CAH is available at Aetrix Electronics and suitable for automotive body electronics, industrial CAN networks, and LED lighting control systems requiring stable component supply and long-term lifecycle support.
Supply support for 1KSMB24CAH 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 transient protection in 12V/24V automotive subsystems, emphasizing high surge robustness, fast response, and surface-mount manufacturability.
FAQ
What does the 'CAH' suffix indicate in 1KSMB24CAH?
The 'CAH' suffix in 1KSMB24CAH denotes a bi-directional configuration - meaning the device provides symmetrical transient voltage clamping for both positive and negative polarity surges. This distinguishes it from the 'AH' variant (uni-directional), and confirms its suitability for protecting AC-coupled or differential signal lines such as CAN bus, where polarity reversal is possible. The 1KSMB24CAH achieves this using a single die with back-to-back zener structure.
Is 1KSMB24CAH qualified for automotive use?
Yes, the 1KSMB24CAH is AEC-Q101 qualified, having passed stress tests including temperature cycling, highly accelerated stress testing (HAST), and mechanical shock per JESD22 standards. It also meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b for automotive electrical transient immunity - confirming its suitability for under-hood and chassis-mounted applications in passenger and commercial vehicles.
What is the maximum clamping voltage of 1KSMB24CAH during a surge event?
The maximum clamping voltage (VC) of the 1KSMB24CAH is 33.2V when subjected to its rated peak impulse current of 30.1A under the standard 10/1000µs waveform. This value is measured at TA = 25°C and guarantees that protected circuitry downstream will not experience voltages exceeding 33.2V during specified transient events - a critical parameter for safeguarding 3.3V, 5V, or 24V-rated ICs.
Does 1KSMB24CAH require special PCB layout considerations?
Yes - to preserve its <1.0ps response time and minimize inductance, the 1KSMB24CAH should be placed as close as possible to the protected port or connector, with short, wide traces to ground and minimal loop area. Its DO-214AA (SMB) footprint requires adherence to TSC's suggested pad layout (documented in Rev A2102), and thermal relief on pads must balance solderability with heat dissipation during surge events.
How does the 1KSMB24CAH compare to uni-directional variants like 1KSMB24AH?
The 1KSMB24CAH differs from the uni-directional 1KSMB24AH in internal construction and application scope: it uses a bi-directional junction to protect both polarities without polarity dependency, whereas 1KSMB24AH functions only in reverse-bias mode and requires correct orientation. The 1KSMB24CAH is preferred for differential buses (e.g., CAN, RS-485) and AC signal paths; 1KSMB24AH suits DC power rail protection where polarity is fixed and forward conduction must be avoided.
1KSMB24CAH 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):
- 20.5V
- Voltage - Breakdown (Min):
- 22.8V
- Voltage - Clamping (Max) @ Ipp:
- 33.2V
- Current - Peak Pulse (10/1000µs):
- 30.1A
- 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)
1KSMB24CAH FAQ
1.How can I place an order for 1KSMB24CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB24CAH 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 1KSMB24CAH reliable?
The price and inventory of 1KSMB24CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB24CAH is usually 5 days.
3.What payment methods are accepted for 1KSMB24CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB24CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB24CAH?
1KSMB24CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB24CAH 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 1KSMB24CAH?
For technical support, including 1KSMB24CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB24CAH requirements.
6.How does Aetrix verify that 1KSMB24CAH is sourced from the original manufacturer or authorized distributors?
All 1KSMB24CAH 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 1KSMB24CAH meets industry standards.
7.What is the process for return or replacement of 1KSMB24CAH?
All 1KSMB24CAH units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB24CAH, 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 1KSMB24CAH part is unused and in its original packaging.
Return procedure for 1KSMB24CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1KSMB24CAH Tags
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