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Taiwan Semiconductor Corporation 1KSMB27AH
- Part No.:
- 1KSMB27AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB27AH.pdf
- Description:
- TVS DIODE 23.1VWM 37.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,962
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Product details
Overview
1KSMB27AH from Taiwan Semiconductor is a unidirectional 1000W transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, with breakdown voltage 25.7–28.4 V at 1.0 mA test current, stand-off voltage 23.1 V, and clamping voltage 37.5 V at 26.7 A peak pulse current. It provides fast-response overvoltage protection for automotive power lines and industrial control inputs.
For engineers reviewing the 1KSMB27AH datasheet, 1KSMB27AH pinout, 1KSMB27AH application, or 1KSMB27AH equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, 175°C max junction temperature, and DO-214AA surface-mount footprint compatibility with automated placement.
Technical Context
The 1KSMB27AH operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 25.7–28.4 V breakdown range. Its glass-passivated junction enables sub-1.0 ps response time and stable clamping performance under repetitive transients.
Designed for high-energy surge suppression, it delivers 1000 W peak pulse power (10/1000 µs waveform), supports 100 A forward surge current (8.3 ms half-sine), and maintains ≤1.0 µA reverse leakage at 23.1 V stand-off voltage - critical for low-power sensor interface protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR min/max | 25.7 V / 28.4 V - defines minimum and maximum voltage at which avalanche conduction begins reliably at 1.0 mA |
| VWM | 23.1 V - maximum continuous reverse operating voltage before significant leakage occurs |
| VC@IPP | 37.5 V at 26.7 A - clamped voltage during 10/1000 µs surge, limiting downstream IC stress |
| PPPSM | 1000 W - peak pulse power handling capability per standard 10/1000 µs waveform |
| TJ max | +175 °C - enables operation in under-hood automotive or high-ambient industrial environments |
| Package | DO-214AA (SMB) - standardized surface-mount outline with 0.110 g mass and J-STD-002 solderability |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with matte tin-plated leads; cathode indicated by band marking; polarity-critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / low-side reference | Connected to ground or low-impedance return path during clamping |
| Cathode | Reverse voltage sensing / high-side connection | Connected to protected line; avalanche conduction initiates here above VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| Glass passivated junction | Ensures stable VBR tolerance and long-term leakage stability across thermal cycles |
| ISO 7637-2 compliant | Withstands defined automotive load-dump and inductive-switching transients (Pulse 1/2a/2b/3a/3b) |
| Moisture sensitivity level 1 | No floor-life limitation or bake requirement prior to reflow; compatible with standard SMT assembly |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground to clamp surges before they reach LDOs or microcontrollers. Use Value: Limits voltage to ≤37.5 V during 26.7 A transients, preventing latch-up or gate oxide damage in downstream silicon. | Use Scenario: Safeguarding 4–20 mA current-loop transmitters against field wiring ESD and inductive kickback. IC Role / Device Role / Timing Role: Standoff-rated TVS on signal input path to absorb fast transients without affecting loop accuracy. Use Value: 23.1 V stand-off ensures no conduction during normal operation; <1.0 µA leakage avoids measurement error. |
| LED Driver Input Protection | Motor Control Board DC Bus Protection |
Use Scenario: Shielding constant-current LED drivers from supply-line switching noise and hot-plug spikes. IC Role / Device Role / Timing Role: Primary overvoltage clamp on input capacitor node to prevent overvoltage failure of driver ICs. Use Value: 1000 W peak power rating handles repeated 10/1000 µs surges common in commercial lighting systems. | Use Scenario: Suppressing inductive flyback from brushed DC motors connected to 24 V control boards. IC Role / Device Role / Timing Role: Unidirectional TVS across motor terminals or H-bridge supply rails to divert energy during turn-off. Use Value: 175 °C junction rating allows mounting near heat-generating MOSFETs without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ27A | Same DO-214AA package; VBR = 28.9–31.9 V; VC = 43.5 V @ 23.0 A; lower PPPSM = 600 W | Lower surge capacity limits use in high-energy automotive pulses | Select 1KSMB27AH when full 1000 W ISO 7637-2 Pulse 1 compliance is required |
| 1.5SMC27A | DO-214AB (SMC) package; larger footprint; VBR = 28.5–31.5 V; VC = 43.0 V @ 23.3 A; PPPSM = 1500 W | Larger size may conflict with space-constrained layouts; higher power margin for industrial surge standards | Choose 1KSMB27AH for SMB footprint compatibility and AEC-Q101 validation |
Compared with SMBJ27A and 1.5SMC27A, the 1KSMB27AH offers optimal balance of AEC-Q101 qualification, DO-214AA footprint, and 1000 W surge rating - making it preferred for automotive body electronics and space-limited industrial modules where both reliability and board area matter.
Availability
1KSMB27AH is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor interfaces, LED driver inputs, and motor control board DC bus protection requiring stable component supply and AEC-Q101-compliant surge immunity.
Supply support for 1KSMB27AH 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 automotive qualification capabilities.
The 1KSMB series was developed specifically for AEC-Q101-compliant, high-reliability transient suppression in automotive and industrial environments - emphasizing robustness, tight VBR tolerance, and consistent clamping performance across temperature.
FAQ
What is the polarity configuration of the 1KSMB27AH?
The 1KSMB27AH is a unidirectional TVS diode, with cathode marked by a band on the DO-214AA package. It conducts only when reverse-biased above its breakdown voltage (25.7–28.4 V), making it suitable for DC power rail protection where polarity is fixed. Bidirectional variants use the "CAH" suffix (e.g., 1KSMB27CAH).
Does the 1KSMB27AH meet automotive qualification standards?
Yes, the 1KSMB27AH is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements. Its construction - glass-passivated junction, moisture sensitivity level 1, and 175°C max junction temperature - supports deployment in engine bay and chassis-mounted automotive electronics.
What is the maximum clamping voltage of the 1KSMB27AH under surge conditions?
The 1KSMB27AH has a maximum clamping voltage (VC) of 37.5 V at 26.7 A peak pulse current (10/1000 µs waveform). This value ensures protected circuits remain below critical overvoltage thresholds during standardized transients, preserving integrity of downstream regulators and microcontrollers.
Can the 1KSMB27AH be used in bidirectional signal line protection?
No - the 1KSMB27AH is unidirectional and unsuitable for AC or bidirectional signal lines. For such applications, use the bidirectional variant 1KSMB27CAH, which features symmetrical breakdown in both polarities and identical package/mechanical dimensions.
What is the standoff voltage rating of the 1KSMB27AH and why does it matter?
The 1KSMB27AH has a maximum working peak reverse voltage (VWM) of 23.1 V. This rating ensures the device remains non-conductive during normal operation, minimizing leakage (<1.0 µA) and avoiding interference with circuit functionality - essential for precision analog and low-power sensor interfaces.
1KSMB27AH 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):
- 23.1V
- Voltage - Breakdown (Min):
- 25.7V
- Voltage - Clamping (Max) @ Ipp:
- 37.5V
- Current - Peak Pulse (10/1000µs):
- 26.7A
- 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)
1KSMB27AH FAQ
1.How can I place an order for 1KSMB27AH through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB27AH 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 1KSMB27AH reliable?
The price and inventory of 1KSMB27AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB27AH is usually 5 days.
3.What payment methods are accepted for 1KSMB27AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB27AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB27AH?
1KSMB27AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB27AH 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 1KSMB27AH?
For technical support, including 1KSMB27AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB27AH requirements.
6.How does Aetrix verify that 1KSMB27AH is sourced from the original manufacturer or authorized distributors?
All 1KSMB27AH 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 1KSMB27AH meets industry standards.
7.What is the process for return or replacement of 1KSMB27AH?
All 1KSMB27AH units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB27AH, 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 1KSMB27AH part is unused and in its original packaging.
Return procedure for 1KSMB27AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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