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Taiwan Semiconductor Corporation 1KSMB24A
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- Part No.:
- 1KSMB24A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB24A.pdf
- Description:
- TVS DIODE 20.5VWM 33.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,941
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Product details
Overview
1KSMB24A 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 junction temperature range −55 °C to +175 °C. It protects DC power rails in switching mode power supplies against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the 1KSMB24A datasheet, 1KSMB24A pinout, 1KSMB24A application, or 1KSMB24A equivalent, key selection criteria include unidirectional clamping performance, 1000W peak pulse power rating, 33.2 V max clamping at 30.1 A, DO-214AA mechanical compatibility, and compliance with automotive transient immunity standards.
Technical Context
The 1KSMB24A operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 22.8–25.2 V breakdown threshold. It clamps transient energy within <1.0 ps response time and sustains 30.1 A peak impulse current under 10/1000 µs waveform while limiting voltage to 33.2 V.
Its glass-passivated junction ensures stable leakage (<1.0 µA at 20.5 V), and thermal design supports 20 °C/W junction-to-lead resistance. The device meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements for SMB molding compound.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR min/max | 22.8 V / 25.2 V - defines minimum and maximum guaranteed avalanche initiation voltage at 1.0 mA test current |
| VWM | 20.5 V - maximum continuous reverse operating voltage before significant leakage begins |
| VC@IPP | 33.2 V @ 30.1 A - clamped voltage during 10/1000 µs transient, critical for downstream IC protection margin |
| PPPSM | 1000 W - peak pulse power handling capability per single 10/1000 µs surge event |
| IPP | 30.1 A - maximum non-repetitive peak current the device can safely divert without failure |
| TJ max | +175 °C - maximum allowable junction temperature, enabling operation in high-ambient industrial environments |
| RθJL | 20 °C/W - thermal resistance from junction to lead, supporting PCB copper pour design for power dissipation |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, cathode-banded unidirectional configuration. Matte tin-plated leads, RoHS-compliant and halogen-free per IEC 61249-2-21.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to system ground or low-voltage rail; forms current path during forward conduction or clamping |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., 24 V supply rail); avalanche conduction occurs when cathode-to-anode voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure |
| Sub-1.0 ps response time | Enables effective suppression of fast-rising ESD and load-dump transients before sensitive circuitry is damaged |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validates suitability for automotive 12 V power network protection without additional filtering stages |
| Moisture sensitivity level 1 | Eliminates need for baking prior to reflow soldering, reducing manufacturing cost and process complexity |
| UL 94V-0 molding compound | Meets flame-retardancy requirements for enclosed industrial and consumer power equipment |
Applications
| Switching Mode Power Supply (SMPS) | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Protection of 24 V input stage against load dump and alternator ripple in off-board SMPS units. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between input rail and ground, absorbing >1000 W surges within nanoseconds. Use Value: Prevents overvoltage damage to upstream rectifiers and downstream PWM controllers by limiting transient voltage to ≤33.2 V. | Use Scenario: Input rail protection in BCM modules exposed to ISO 7637-2 Pulse 2b (battery disconnect) and Pulse 5a (load dump). IC Role / Device Role / Timing Role: Primary transient suppressor on main 24 V supply line, positioned before DC-DC converters and microcontroller LDOs. Use Value: Maintains system uptime by clamping 1000 W pulses without degradation, validated per automotive EMC test plan. |
| Industrial Motor Drive DC Bus | Medical Power Adapter Input Stage |
Use Scenario: Surge protection on 24 V DC bus feeding gate drivers and current sensors in compact motor drives. IC Role / Device Role / Timing Role: Fast-response unidirectional clamp that diverts inductive kickback energy away from isolated feedback circuits. Use Value: Enables use of smaller input capacitors by absorbing repetitive 30.1 A transients without thermal runaway (TJ ≤ 175 °C). | Use Scenario: Secondary-side transient suppression in 24 V medical-grade AC/DC adapters meeting IEC 60601-1 creepage and flammability requirements. IC Role / Device Role / Timing Role: Final-stage TVS on output rail, safeguarding connected diagnostic equipment from external surge coupling. Use Value: Halogen-free, UL 94V-0 package and MSL-1 rating support regulatory compliance and automated assembly in certified production lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24A (Bourns) | Same DO-214AA package, identical VBR (22.8–25.2 V), but higher VC = 38.9 V @ 25.7 A and lower PPPSM = 600 W | Less robust clamping margin in high-energy 10/1000 µs events; suitable only where peak current <25 A is expected | Select 1KSMB24A when full 1000 W immunity per ISO 7637-2 Pulse 5a is required |
| 1.5SMC24A (ON Semiconductor) | Same electrical specs (VBR, VC, IPP) but in larger DO-214AB (SMC) package; 1.5× footprint area and 2.5× weight | Requires PCB layout change; better thermal mass but incompatible with space-constrained SMB footprints | Choose 1KSMB24A for DO-214AA footprint compatibility and automated placement optimization |
Compared with SMBJ24A and 1.5SMC24A, the 1KSMB24A delivers superior 1000 W pulse handling in the smallest standard SMB outline, with tighter clamping (33.2 V vs. 38.9 V) and MSL-1 process readiness-making it optimal for high-density automotive and industrial 24 V rail protection.
Availability
1KSMB24A is available at Aetrix Electronics and suitable for switching mode power supplies, automotive body control modules, and industrial motor drive DC buses requiring stable component supply, automotive-grade transient immunity, and surface-mount manufacturability.
Supply support for 1KSMB24A 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 for industrial, automotive, and consumer markets.
The 1KSMB series was engineered specifically for high-reliability 12 V and 24 V automotive and industrial power rail protection, emphasizing fast response, ISO 7637-2 compliance, and automated assembly readiness.
FAQ
What is the polarity configuration of the 1KSMB24A?
The 1KSMB24A is a unidirectional TVS diode with cathode band marking. It conducts in reverse bias above its 22.8–25.2 V breakdown voltage and blocks up to 20.5 V in forward direction. Its polarity must be observed during PCB layout-cathode connects to the protected line, anode to ground. This configuration is confirmed in the device's marking diagram and absolute maximum ratings table.
Does the 1KSMB24A meet automotive transient immunity standards?
Yes, the 1KSMB24A meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements, as explicitly stated in its features list. Its 1000 W peak pulse power rating, 33.2 V clamping voltage at 30.1 A, and sub-1.0 ps response time enable direct compliance with load-dump and supply interruption test profiles common in 12 V and 24 V vehicle networks.
What is the maximum steady-state power dissipation for the 1KSMB24A?
The 1KSMB24A has a steady-state power dissipation (PD) of 5 W at TA = 25 °C, as specified in its Absolute Maximum Ratings table. This value derates linearly above 25 °C per the Pulse Derating Curve (Fig.2), reaching zero at 175 °C junction temperature. Continuous DC power dissipation must remain below this limit to avoid thermal runaway.
Is the 1KSMB24A compatible with lead-free reflow soldering processes?
Yes, the 1KSMB24A uses matte tin-plated leads compliant with J-STD-002 solderability standards and has a moisture sensitivity level (MSL) of 1 per J-STD-020-meaning it can be stored indefinitely at ambient conditions and placed directly into lead-free reflow without pre-baking. Its UL 94V-0 molding compound also withstands peak reflow temperatures up to 260 °C.
How does the 1KSMB24A differ from the 1KSMB24CA variant?
The 1KSMB24CA is the bidirectional version of the same device, with symmetrical breakdown in both polarities (VBR = 22.8–25.2 V in either direction) and no polarity marking. In contrast, the 1KSMB24A is unidirectional, optimized for DC rail protection where only reverse transients occur. Their clamping voltages, peak power, and package are identical-but circuit function and schematic symbol differ fundamentally.
1KSMB24A 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
1KSMB24A FAQ
1.How can I place an order for 1KSMB24A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB24A 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 1KSMB24A reliable?
The price and inventory of 1KSMB24A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB24A is usually 5 days.
3.What payment methods are accepted for 1KSMB24A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB24A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB24A?
1KSMB24A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB24A 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 1KSMB24A?
For technical support, including 1KSMB24A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB24A requirements.
6.How does Aetrix verify that 1KSMB24A is sourced from the original manufacturer or authorized distributors?
All 1KSMB24A 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 1KSMB24A meets industry standards.
7.What is the process for return or replacement of 1KSMB24A?
All 1KSMB24A units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB24A, 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 1KSMB24A part is unused and in its original packaging.
Return procedure for 1KSMB24A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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