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Taiwan Semiconductor Corporation 1KSMB43AH
- Part No.:
- 1KSMB43AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB43AH.pdf
- Description:
- TVS DIODE 36.8VWM 59.3VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,371
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Product details
Overview
1KSMB43AH from Taiwan Semiconductor is a unidirectional 1000W surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AA (SMB) package, with breakdown voltage 40.9–45.2 V, stand-off voltage 36.8 V, clamping voltage 59.3 V at 16.9 A, and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the 1KSMB43AH datasheet, 1KSMB43AH pinout, 1KSMB43AH application, or 1KSMB43AH equivalent, this part serves as a high-energy, fast-response (sub-1 ps) overvoltage protector for DC power rails, automotive electronics, and industrial control interfaces where precise clamping and ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance are required.
Technical Context
The 1KSMB43AH operates as a unidirectional avalanche diode, designed to clamp transient surges on positive-polarity DC lines. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1 µA @ 36.8 V), while its thermal resistance (RθJL = 20 °C/W) supports sustained surge handling under PCB-constrained thermal conditions.
It meets ISO 7637-2 immunity requirements for automotive applications and is rated for 1000 W peak pulse power (10/1000 µs waveform), with a maximum junction temperature of +175 °C and moisture sensitivity level 1 per J-STD-020 - enabling robust reflow compatibility and long-term reliability in harsh environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR min/max | 40.9 V / 45.2 V - defines minimum and maximum guaranteed avalanche initiation voltage at 1 mA test current |
| VWM | 36.8 V - maximum continuous reverse operating voltage before significant leakage begins |
| VC@IPP | 59.3 V @ 16.9 A - clamping voltage during 10/1000 µs surge, limiting downstream circuit stress |
| PPPSM | 1000 W - peak pulse power rating determines surge energy absorption capability |
| IPP | 16.9 A - maximum non-repetitive peak impulse current the device can safely divert |
| TJ max | +175 °C - maximum junction temperature enables operation in under-hood automotive environments |
| Package | DO-214AA (SMB) - standardized surface-mount outline with cathode band marking and 0.110 g mass |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band; lead-free and RoHS-compliant; UL 94V-0 flammability rating; JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or return path; forms current path during forward-biased surge conduction |
| Cathode | High-side transient input | Connected to protected line; avalanche breakdown occurs between cathode and anode when VRM exceeded |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics use, including temperature cycling, humidity bias, and mechanical shock testing |
| Glass passivated junction | Ensures stable VBR tolerance and low parameter drift over time and temperature |
| Sub-1 ps response time | Enables protection against ultrafast ESD and EFT events before sensitive ICs experience damage |
| ISO 7637-2 compliance | Guarantees immunity to automotive load-dump and inductive-switching transients (Pulse 1/2a/2b/3a/3b) |
| Moisture sensitivity level 1 | Allows unlimited floor life and standard reflow without baking preconditioning |
Applications
| Automotive Power Rail Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 36 V battery-fed ECUs from load dump and alternator transients in passenger vehicles and commercial trucks. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and regulator input to clamp spikes above 36.8 V. Use Value: Limits voltage to ≤59.3 V during 16.9 A surges, preventing damage to downstream LDOs and microcontrollers. | Use Scenario: Safeguarding 24 V DC digital input modules in programmable logic controllers exposed to field-wiring inductive kickback. IC Role / Device Role / Timing Role: Standoff-rated TVS on each channel input to absorb repetitive switching transients from solenoids and relays. Use Value: Maintains system uptime by preventing false triggering and latch-up in optocoupler input stages. |
| LED Driver Overvoltage Clamp | Telecom DC Power Interface |
Use Scenario: Clamping voltage overshoot on constant-current LED driver outputs during hot-swap or cable disconnect events. IC Role / Device Role / Timing Role: Parallel-connected TVS across output terminals to limit transient excursions beyond LED string Vf + margin. Use Value: Prevents catastrophic failure of GaN FETs and current-sense amplifiers by capping voltage at 59.3 V. | Use Scenario: Front-end protection for 48 V telecom power supplies receiving input from PoE++ or distributed DC sources. IC Role / Device Role / Timing Role: Primary surge suppressor on input bus before DC-DC conversion stage. Use Value: Absorbs up to 1000 W of 10/1000 µs energy without degradation, preserving upstream fuse coordination. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ43A | Same DO-214AA package; VBR = 45.2–50.0 V; VC = 69.4 V @ 14.4 A; PPPM = 600 W | Lower peak power rating limits use in high-energy automotive load dump scenarios | Select SMBJ43A only for cost-sensitive, lower-energy industrial applications where 600 W suffices |
| 1.5KE43A | Through-hole DO-15 package; same VBR range; VC = 64.5 V @ 15.5 A; PPPM = 1500 W | Not surface-mountable; incompatible with automated SMT assembly; higher thermal mass slows response slightly | Choose 1.5KE43A only for prototyping or legacy through-hole designs requiring higher peak power |
Compared with SMBJ43A and 1.5KE43A, the 1KSMB43AH delivers optimal balance of 1000 W surge capacity, SMT manufacturability, AEC-Q101 qualification, and tight 40.9–45.2 V VBR tolerance - making it preferred for production automotive and industrial systems requiring both reliability and assembly efficiency.
Availability
1KSMB43AH is available at Aetrix Electronics and suitable for automotive electronics, industrial PLCs, LED driver modules, and telecom power interfaces requiring stable component supply and full traceability.
Supply support for 1KSMB43AH 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, with global distribution and AEC-Q101 validation capabilities.
The 1KSMB series was developed specifically for high-reliability, surface-mount transient suppression in automotive and industrial environments - emphasizing fast response, stable clamping, and robust thermal performance in compact SMB packages.
FAQ
What is the polarity configuration of the 1KSMB43AH?
The 1KSMB43AH is a unidirectional TVS diode, with cathode marked by a band on the DO-214AA package. It conducts only during reverse-biased overvoltage events - i.e., when the cathode voltage exceeds the anode by more than VBR. This makes it suitable for protecting positive-rail DC systems. The 1KSMB43AH does not conduct in forward bias except during surge clamping.
Does the 1KSMB43AH meet automotive qualification standards?
Yes, the 1KSMB43AH is AEC-Q101 qualified and tested per the full automotive stress test suite, including temperature cycling, high-temperature operating life, and mechanical shock. It also meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements - confirming suitability for engine control units, body electronics, and ADAS power domains.
What is the maximum clamping voltage of the 1KSMB43AH under surge conditions?
The 1KSMB43AH has a maximum clamping voltage (VC) of 59.3 V at a peak pulse current (IPP) of 16.9 A using the 10/1000 µs waveform. This value is guaranteed across temperature and process variation, and defines the upper voltage limit imposed on protected circuits during transient events.
Can the 1KSMB43AH be used in bidirectional configurations?
No - the 1KSMB43AH is unidirectional only. For bidirectional protection, the designated variant is 1KSMB43CAH, which uses a center-tapped dual-diode configuration in the same DO-214AA package. Substituting 1KSMB43AH for bidirectional use would leave negative transients unprotected and may cause failure.
What is the thermal resistance of the 1KSMB43AH, and how does it affect layout design?
The 1KSMB43AH has a junction-to-lead thermal resistance (RθJL) of 20 °C/W and junction-to-ambient (RθJA) of 100 °C/W. To maintain safe operation during repeated surges, PCB layout must include adequate copper pour on both anode and cathode pads - especially for the cathode - to emulate the thermal performance measured on standard JEDEC test boards.
1KSMB43AH 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):
- 36.8V
- Voltage - Breakdown (Min):
- 40.9V
- Voltage - Clamping (Max) @ Ipp:
- 59.3V
- Current - Peak Pulse (10/1000µs):
- 16.9A
- 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)
1KSMB43AH FAQ
1.How can I place an order for 1KSMB43AH through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB43AH 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 1KSMB43AH reliable?
The price and inventory of 1KSMB43AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB43AH is usually 5 days.
3.What payment methods are accepted for 1KSMB43AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB43AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB43AH?
1KSMB43AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB43AH 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 1KSMB43AH?
For technical support, including 1KSMB43AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB43AH requirements.
6.How does Aetrix verify that 1KSMB43AH is sourced from the original manufacturer or authorized distributors?
All 1KSMB43AH 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 1KSMB43AH meets industry standards.
7.What is the process for return or replacement of 1KSMB43AH?
All 1KSMB43AH units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB43AH, 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 1KSMB43AH part is unused and in its original packaging.
Return procedure for 1KSMB43AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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