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Taiwan Semiconductor Corporation 1KSMB36AH
- Part No.:
- 1KSMB36AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB36AH.pdf
- Description:
- TVS DIODE 30.8VWM 49.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,879
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Product details
Overview
1KSMB36AH from Taiwan Semiconductor is a unidirectional 1000W transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, with breakdown voltage 34.2–37.8 V, stand-off voltage 30.8 V, clamping voltage 49.9 V at 20.0 A peak pulse current, and AEC-Q101 qualification for automotive use.
For engineers reviewing the 1KSMB36AH datasheet, 1KSMB36AH pinout, 1KSMB36AH application, or 1KSMB36AH equivalent, key selection factors include its 1000W peak pulse power rating, sub-1 ps response time, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, moisture sensitivity level 1, and unidirectional polarity marking for ESD and load-switching surge protection in automotive electronics.
Technical Context
The 1KSMB36AH operates as a unidirectional avalanche diode optimized for fast clamping of high-energy transients. Its glass-passivated junction ensures stable breakdown behavior, while the DO-214AA package provides thermal resistance of 20°C/W (junction-to-lead) and supports automated SMT placement.
It delivers 49.9 V clamping voltage at 20.0 A (10/1000 µs waveform), with 1.0 mA test current defining VBR, and exhibits ≤10 µA reverse leakage at 30.8 V stand-off voltage - enabling reliable protection of 3.3 V/5 V/12 V rail interfaces without false triggering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR min/max | 34.2 V to 37.8 V - defines minimum and maximum guaranteed avalanche onset under 1.0 mA DC test, ensuring predictable turn-on across temperature and lot variation |
| VWM | 30.8 V - maximum continuous reverse operating voltage; must exceed system nominal rail voltage (e.g., 24 V automotive) with margin |
| VC@IPP | 49.9 V at 20.0 A - clamping voltage during 10/1000 µs surge; determines protected IC's maximum transient stress level |
| PPPSM | 1000 W - peak pulse power handling capability; enables robust suppression of ISO 7637-2 Pulse 2b (inductive switch-off) events |
| TJ max | +175 °C - maximum junction temperature; supports operation in under-hood automotive environments with minimal derating |
| Response time | <1.0 ps - time from 0 V to VBR min; ensures effective suppression of ESD and fast electrical fast transients (EFT) |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, single-die unidirectional configuration with cathode band marking. Dimensions per JEDEC DO-214AA standard; matte tin-plated leads, RoHS and halogen-free compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to ground or low-side return path; conducts during forward surge (e.g., IFSM = 100 A, VF = 3.5 V) |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., CAN_H, LIN, 12 V supply); avalanches into conduction when VLINE exceeds VBR |
| Cathode band | Polarity indicator | Visible marking on package body; identifies cathode end for correct PCB orientation and unidirectional protection direction |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and mechanical shock - required for engine control, body electronics, and ADAS modules |
| Glass passivated junction | Stable VBR tolerance and low leakage over lifetime; prevents parameter drift due to humidity or contamination in harsh environments |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (EFT) without degradation - eliminates need for external filtering stages |
| Moisture sensitivity level 1 | No floor life limitation or baking requirement before reflow; simplifies SMT manufacturing and reduces assembly cost |
| 1000 W peak pulse rating | Handles high-energy surges from alternator load dump or relay coil collapse without failure - protects downstream CAN transceivers and microcontrollers |
Applications
| Automotive Power Line Protection | CAN Bus Transient Suppression |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator transients in passenger vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp surges above 30.8 V. Use Value: Limits peak voltage to 49.9 V during 1000 W pulses, preventing damage to 40 V-rated LDOs and MCU power supplies. | Use Scenario: Safeguarding high-speed CAN FD transceivers against ESD and coupled noise on differential bus lines. IC Role / Device Role / Timing Role: Unidirectional TVS connected from CAN_H to ground, leveraging fast <1 ps response to suppress EFT bursts. Use Value: Clamps transients before they propagate into the transceiver input stage, maintaining signal integrity and bit error rate below 10⁻¹². |
| Industrial Sensor Interface Protection | LED Driver Load-Switching Clamp |
Use Scenario: Shielding analog front-end circuits (e.g., current-sense amps, ADC inputs) in factory automation sensors. IC Role / Device Role / Timing Role: TVS placed at sensor signal entry point to absorb coupling from nearby motor drives or solenoids. Use Value: 30.8 V stand-off avoids interference with 24 V sensor supply rails while clamping induced spikes to safe levels for 5 V logic interfaces. | Use Scenario: Absorbing inductive kickback from PWM-driven LED strings in automotive lighting modules. IC Role / Device Role / Timing Role: Unidirectional TVS across LED anode and ground to shunt flyback energy during MOSFET turn-off. Use Value: 1000 W rating handles repetitive 10/1000 µs surges from 2 A–5 A LED currents, extending driver FET lifetime and reducing EMI. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ36A | Same DO-214AA package, identical VBR (34.2–37.8 V), but lower PPPSM = 600 W and higher VC = 58.1 V at 10.3 A | Not suitable for ISO 7637-2 Pulse 1 or sustained load dump; limited to lower-energy ESD/EFT scenarios | Select 1KSMB36AH where full 1000 W surge immunity is required - e.g., powertrain or chassis modules |
| 1.5SMC36A | Higher power (1500 W), same VBR range, but larger DO-214AB (SMC) package (7.11 × 6.22 mm vs. 4.57 × 3.94 mm) | Requires PCB layout change; unsuitable for space-constrained automotive modules using SMB footprint | Choose 1KSMB36AH when board area is constrained and 1000 W suffices - balances performance, size, and cost |
Compared with SMBJ36A and 1.5SMC36A, the 1KSMB36AH uniquely combines AEC-Q101 qualification, DO-214AA footprint, 1000 W rating, and 49.9 V clamping in a single solution - making it optimal for automotive body control units and infotainment power rails where space, reliability, and surge margin are jointly critical.
Availability
1KSMB36AH is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and LED lighting systems requiring stable component supply and long-term lifecycle support.
Supply support for 1KSMB36AH 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-compliant production lines.
The 1KSMB series was designed specifically for automotive-grade transient suppression - targeting under-hood and body electronics that demand high surge robustness, zero maintenance reliability, and seamless SMT integration.
FAQ
What is the maximum clamping voltage of the 1KSMB36AH under standard test conditions?
The 1KSMB36AH has a maximum clamping voltage (VC) of 49.9 V when subjected to a 10/1000 µs peak pulse current of 20.0 A. This value is measured at TA = 25°C and defines the upper voltage limit imposed on protected circuitry during surge events. The 1KSMB36AH maintains this clamping performance across its specified junction temperature range of –55°C to +175°C, with minor derating above 25°C ambient per the pulse derating curve in the datasheet.
Is the 1KSMB36AH suitable for bidirectional transient protection?
No, the 1KSMB36AH is a unidirectional TVS diode and is not rated for bidirectional operation. For bidirectional protection, the pin-compatible 1KSMB36CAH variant must be used - it features symmetrical breakdown in both polarities and carries the "CAH" suffix. Using the 1KSMB36AH in reverse-biased configurations risks permanent junction damage, as its reverse standoff voltage (30.8 V) applies only in the marked cathode-to-anode direction.
Does the 1KSMB36AH require special handling during PCB assembly?
No, the 1KSMB36AH has moisture sensitivity level (MSL) 1 per J-STD-020, meaning it can be stored indefinitely at ambient conditions without baking or dry-pack requirements. It is compatible with standard lead-free reflow profiles (peak temperature ≤260°C), and its matte tin-plated leads meet J-STD-002 solderability specifications. No special handling beyond standard SMT practices is needed for the 1KSMB36AH.
How does the 1KSMB36AH compare to standard 1N6267A-type TVS diodes?
The 1KSMB36AH offers superior automotive qualification (AEC-Q101), tighter VBR tolerance (±5% vs. ±10% typical for 1N6267A), lower clamping voltage (49.9 V vs. ≥53.3 V), and enhanced thermal performance (RθJL = 20°C/W). Unlike legacy 1N6267A in DO-201AD, the 1KSMB36AH uses DO-214AA for smaller footprint and better SMT yield - making it a direct upgrade for new designs targeting modern automotive and industrial standards.
Can the 1KSMB36AH be used in parallel to increase surge current handling?
Parallel connection of 1KSMB36AH devices is not recommended due to mismatch in VBR (34.2–37.8 V) and dynamic impedance, which causes uneven current sharing and potential thermal runaway. For higher current capability, select a single higher-rated device such as 1.5SMC36A (1500 W) or verify matched-bin parts with VBR spread ≤1% - but note that the 1KSMB36AH itself is not characterized for paralleling in the official datasheet.
1KSMB36AH 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):
- 30.8V
- Voltage - Breakdown (Min):
- 34.2V
- Voltage - Clamping (Max) @ Ipp:
- 49.9V
- Current - Peak Pulse (10/1000µs):
- 20A
- 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)
1KSMB36AH FAQ
1.How can I place an order for 1KSMB36AH through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB36AH 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 1KSMB36AH reliable?
The price and inventory of 1KSMB36AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB36AH is usually 5 days.
3.What payment methods are accepted for 1KSMB36AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB36AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB36AH?
1KSMB36AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB36AH 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 1KSMB36AH?
For technical support, including 1KSMB36AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB36AH requirements.
6.How does Aetrix verify that 1KSMB36AH is sourced from the original manufacturer or authorized distributors?
All 1KSMB36AH 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 1KSMB36AH meets industry standards.
7.What is the process for return or replacement of 1KSMB36AH?
All 1KSMB36AH units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB36AH, 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 1KSMB36AH part is unused and in its original packaging.
Return procedure for 1KSMB36AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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