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Taiwan Semiconductor Corporation 1KSMB24AH
- Part No.:
- 1KSMB24AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB24AH.pdf
- Description:
- TVS DIODE 20.5VWM 33.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,357
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Product details
Overview
1KSMB24AH from Taiwan Semiconductor is a unidirectional 1000W surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AA (SMB) package, with breakdown voltage 22.8–25.2 V, stand-off voltage 20.5 V, clamping voltage 33.2 V at 30.1 A, and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the 1KSMB24AH datasheet, 1KSMB24AH pinout, 1KSMB24AH application, or 1KSMB24AH equivalent, key selection criteria include unidirectional polarity, 10/1000 µs surge capability, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, glass-passivated junction, and J-STD-020 Level 1 moisture sensitivity - all critical for ESD and load-dump protection in automotive electronics.
Technical Context
The 1KSMB24AH operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 22.8–25.2 V breakdown threshold. It clamps transients to ≤33.2 V at 30.1 A peak pulse current using a glass-passivated silicon junction with <1.0 ps response time.
Thermally, it features 20 °C/W junction-to-lead and 100 °C/W junction-to-ambient resistance, enabling 5 W steady-state dissipation at 25 °C ambient. Its DO-214AA (SMB) package supports automated placement and meets UL 94V-0 flammability and JESD 201 Class 2 whisker requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR min/max | 22.8 V / 25.2 V - defines minimum and maximum voltage at which avalanche conduction begins under 1 mA test current |
| VWM | 20.5 V - maximum continuous reverse operating voltage before leakage exceeds 1 µA |
| VC@IPP | 33.2 V @ 30.1 A - clamped voltage during 10/1000 µs transient, limiting downstream IC stress |
| PPPSM | 1000 W - non-repetitive peak pulse power handling per IEC 61000-4-5 and ISO 7637-2 |
| TJ max | +175 °C - maximum junction temperature enabling operation in under-hood automotive environments |
| Response time | <1.0 ps - enables suppression of fast ESD events before sensitive circuitry is damaged |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, cathode-banded unidirectional configuration. Matte tin-plated leads, 0.110 g weight, UL 94V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or low-side return path during normal operation |
| Cathode | Reverse-biased transient clamp terminal | Connected to protected line (e.g., 24 V supply rail); conducts only during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and infotainment systems |
| Glass passivated junction | Enhances long-term reliability and stability under thermal cycling and humidity exposure |
| ISO 7637-2 compliance | Withstands standardized automotive load-dump (Pulse 5a/b) and coupled transient (Pulse 1/2a/2b/3a/3b) waveforms |
| J-STD-020 Level 1 moisture sensitivity | Enables standard SMT reflow without pre-bake, reducing manufacturing complexity and cost |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 24 V supply lines in vehicle ECUs against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between battery rail and DC-DC input, clamping surges before they reach power management ICs. Use Value: Limits peak voltage to 33.2 V during 30.1 A transients, preventing damage to 36 V-rated regulators and microcontrollers. | Use Scenario: Shielding analog sensor inputs (e.g., pressure, temperature) from ESD and switching noise in factory automation PLCs. IC Role / Device Role / Timing Role: Front-end transient suppressor on signal lines entering precision ADCs or op-amp buffers. Use Value: Sub-1 ps response ensures clamping occurs before ESD energy couples into high-impedance input stages, preserving measurement accuracy. |
| LED Lighting Driver Protection | Automotive CAN Bus Node Protection |
Use Scenario: Safeguarding constant-current LED drivers in commercial lighting against inductive kickback from relay or MOSFET switching. IC Role / Device Role / Timing Role: Parallel-connected TVS across driver output to absorb stored inductor energy during turn-off. Use Value: 1000 W peak power rating handles repetitive 10/1000 µs pulses common in 24 V industrial lighting control. | Use Scenario: Secondary-level protection for CAN transceivers exposed to board-level ESD and cable-coupled transients. IC Role / Device Role / Timing Role: Placed on CAN_H/CAN_L lines upstream of common-mode choke to limit differential-mode overvoltage. Use Value: 20.5 V stand-off voltage avoids interference with 2.5–3.3 V CAN signaling while clamping >25 V threats to safe levels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24A | Same DO-214AA package, identical VBR (22.8–25.2 V), but rated for 600 W PPPM vs. 1000 W | Lower surge capacity limits use to non-load-dump scenarios like ESD-only protection | Select 1KSMB24AH where ISO 7637-2 Pulse 5a/b (load dump) immunity is required |
| 1.5SMC24A | DO-214AB (SMC) package, larger footprint, same VBR, 1500 W rating, higher thermal mass | Requires PCB redesign due to larger pad layout and 2.5× footprint area | Choose 1KSMB24AH for space-constrained SMB layouts needing 1000 W in minimal area |
Compared with SMBJ24A and 1.5SMC24A, the 1KSMB24AH delivers optimal balance of 1000 W surge capability, AEC-Q101 qualification, and DO-214AA footprint - making it preferred for automotive 24 V rail protection where board space and regulatory compliance are both critical.
Availability
1KSMB24AH is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and LED driver surge suppression requiring stable component supply and full traceability.
Supply support for 1KSMB24AH 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 1KSMB series is designed specifically for high-reliability transient suppression in automotive and industrial environments, emphasizing AEC-Q101 compliance, robust surge handling, and SMT manufacturability.
FAQ
What is the polarity configuration of the 1KSMB24AH?
The 1KSMB24AH is a unidirectional TVS diode, with cathode marked by a band on the DO-214AA package. It conducts only during reverse overvoltage events and blocks forward current above ~3.5 V, making it suitable for DC rail protection where polarity is fixed. This differs from bidirectional variants like 1KSMB24CAH, which protect AC or differential signals.
Does the 1KSMB24AH meet automotive qualification standards?
Yes, the 1KSMB24AH is AEC-Q101 qualified and tested to ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b transient waveforms. Its construction - glass-passivated junction, J-STD-020 Level 1 moisture sensitivity, and UL 94V-0 molding - supports deployment in engine control units, body modules, and other automotive subsystems requiring validated reliability.
What is the maximum clamping voltage of the 1KSMB24AH under surge conditions?
The 1KSMB24AH has a maximum clamping voltage (VC) of 33.2 V at 30.1 A peak pulse current (IPP) under the standard 10/1000 µs waveform. This value ensures downstream 36 V-rated ICs remain within safe operating limits during transient events, and is verified per ANSI/IEEE C62.35 test methodology.
Can the 1KSMB24AH be used in bidirectional signal protection?
No - the 1KSMB24AH is unidirectional and unsuitable for bidirectional signal lines such as RS-485 or CAN without additional circuitry. For those applications, the pin-compatible 1KSMB24CAH (with CAH suffix) must be selected, as it provides symmetrical breakdown in both directions and is explicitly designated for bipolar use in the datasheet.
What is the thermal resistance profile of the 1KSMB24AH?
The 1KSMB24AH has a junction-to-lead thermal resistance (RθJL) of 20 °C/W and junction-to-ambient resistance (RθJA) of 100 °C/W at 25 °C ambient. These values enable 5 W steady-state power dissipation and inform heatsinking decisions when deployed in high-temperature enclosures or near heat-generating components.
1KSMB24AH 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):
- 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)
1KSMB24AH FAQ
1.How can I place an order for 1KSMB24AH through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB24AH 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 1KSMB24AH reliable?
The price and inventory of 1KSMB24AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB24AH is usually 5 days.
3.What payment methods are accepted for 1KSMB24AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB24AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB24AH?
1KSMB24AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB24AH 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 1KSMB24AH?
For technical support, including 1KSMB24AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB24AH requirements.
6.How does Aetrix verify that 1KSMB24AH is sourced from the original manufacturer or authorized distributors?
All 1KSMB24AH 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 1KSMB24AH meets industry standards.
7.What is the process for return or replacement of 1KSMB24AH?
All 1KSMB24AH units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB24AH, 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 1KSMB24AH part is unused and in its original packaging.
Return procedure for 1KSMB24AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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