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Taiwan Semiconductor Corporation 1KSMB27CAH
- Part No.:
- 1KSMB27CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB27CAH.pdf
- Description:
- TVS DIODE 23.1VWM 37.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,911
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Product details
Overview
1KSMB27CAH from Taiwan Semiconductor is a bi-directional 1000W transient voltage suppressor (TVS) in DO-214AA (SMB) package, with breakdown voltage 25.7–28.4 V at 1 mA, stand-off voltage 23.1 V, clamping voltage 37.5 V at 26.7 A, and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the 1KSMB27CAH datasheet, 1KSMB27CAH pinout, 1KSMB27CAH application, or 1KSMB27CAH equivalent, key selection criteria include bi-directional clamping capability, ISO 7637-2 pulse immunity compliance, moisture sensitivity level 1, and surface-mount compatibility for automated assembly in harsh-environment electronics.
Technical Context
The 1KSMB27CAH employs a glass-passivated silicon junction to achieve fast response (<1.0 ps from 0 V to VBR(min)) and stable clamping under repetitive transients. Its bi-directional configuration enables symmetric protection of AC-coupled or differential signal lines without polarity concerns.
Designed for high-energy surge suppression, it delivers 1000 W peak pulse power (10/1000 µs waveform), supports junction temperatures up to +175 °C, and maintains <1.0 µA reverse leakage at 23.1 V, ensuring low standby power loss in always-on systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 25.7 V / 28.4 V - defines minimum and maximum voltage at which device enters avalanche conduction under 1 mA test current |
| VWM | 23.1 V - maximum continuous reverse operating voltage before significant leakage begins |
| 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 capacity per single 10/1000 µs transient event |
| TJ(max) | +175 °C - maximum junction temperature enabling operation in under-hood automotive environments |
| Package | DO-214AA (SMB) - standardized surface-mount outline with 0.110 g mass and UL 94V-0 molding compound |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with cathode band marking; matte tin-plated leads compliant with J-STD-002 solderability; polarity indicated by band for unidirectional variants - but 1KSMB27CAH is bi-directional, so no functional polarity marking required.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bi-directional terminal pair | Either end serves as input/output; identical electrical behavior in both directions for AC or bidirectional DC protection |
| Case | Non-connected mechanical body | No internal connection; provides thermal path and mechanical mounting only |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control, infotainment, and ADAS modules requiring zero-failure reliability |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Guarantees robustness against load-dump, alternator-switching, and inductive-spike transients in 12 V vehicle systems |
| Moisture sensitivity level 1 (J-STD-020) | Enables direct placement without baking or dry-pack handling, reducing manufacturing cost and process complexity |
| Glass passivated junction | Improves long-term stability and reduces parameter drift under thermal cycling and humidity exposure |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting LIN bus or CAN FD power rails from battery dump and alternator switching spikes in passenger vehicles. IC Role / Device Role / Timing Role: Bi-directional TVS placed between VBAT and GND upstream of LDO regulators and communication ICs. Use Value: Clamps 1000 W surges to ≤37.5 V, preventing latch-up or permanent damage to 3.3 V/5 V microcontrollers and transceivers. | Use Scenario: Shielding analog front-end inputs of pressure/temperature sensors in factory automation PLCs exposed to relay coil flyback. IC Role / Device Role / Timing Role: Parallel-connected transient shunt across sensor supply pins to divert inductive kick energy away from precision amplifiers. Use Value: Sub-1 ps response ensures clamping initiates before sensitive op-amps exceed absolute maximum ratings during 100 ns–1 µs transients. |
| LED Driver Input Stage Protection | USB-C Port ESD & Surge Suppression |
Use Scenario: Safeguarding constant-current LED drivers in outdoor signage from lightning-induced surges on 24 V DC input lines. IC Role / Device Role / Timing Role: Primary overvoltage clamp on DC input rail, coordinated with fuse and MOV for staged protection. Use Value: 1000 W rating handles multi-event surges common in ungrounded outdoor installations without degradation. | Use Scenario: Dual-rail protection for USB-C VBUS and CC lines in portable docking stations subjected to hot-plug ESD and cable discharge events. IC Role / Device Role / Timing Role: Bi-directional TVS on each protected line to absorb ±15 kV contact ESD (IEC 61000-4-2) and 10/1000 µs surges. Use Value: 23.1 V stand-off allows full 20 V VBUS operation while clamping to 37.5 V - below USB-C 24 V abs max rating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ26CA | VBR = 28.9–31.9 V; VC = 42.1 V at 23.8 A; same DO-214AA package | Higher clamping voltage reduces margin for 24 V systems; lower IPP than 1KSMB27CAH | Select when tighter VBR tolerance is needed and 42.1 V clamping is acceptable |
| 1.5SMC27CA | VBR = 28.9–31.9 V; VC = 42.1 V at 23.8 A; larger DO-214AB (SMC) package | Requires PCB layout change; higher thermal mass improves sustained surge handling | Choose for higher reliability in thermally constrained designs where board space permits SMC footprint |
Compared with SMBJ26CA and 1.5SMC27CA, the 1KSMB27CAH offers lower clamping voltage (37.5 V vs ≥42.1 V) and higher peak current (26.7 A vs ≤23.8 A) in the compact SMB outline - making it optimal for space-constrained 24 V automotive and industrial modules needing tight voltage margins.
Availability
1KSMB27CAH is available at Aetrix Electronics and suitable for automotive power line protection, industrial sensor interface protection, and LED driver input stage protection requiring stable component supply and AEC-Q101-compliant sourcing.
Supply support for 1KSMB27CAH 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 1KSMBxxCAH series is part of TSC's AEC-Q101-qualified SMB-format TVS portfolio, engineered specifically for robust transient immunity in 12 V/24 V automotive and industrial power systems.
FAQ
What does the 'CAH' suffix indicate in 1KSMB27CAH?
The 'CAH' suffix denotes a bi-directional configuration - meaning the 1KSMB27CAH provides symmetrical clamping for both positive and negative transients without polarity dependency. This differs from 'AH' variants, which are unidirectional and require correct anode/cathode orientation. The CAH version is ideal for AC signal lines or differential buses where voltage polarity reverses.
Is 1KSMB27CAH suitable for ISO 7637-2 Pulse 5a (load dump) protection?
No - 1KSMB27CAH is rated for ISO 7637-2 Pulses 1, 2a, 2b, 3a, and 3b, but not Pulse 5a (load dump), which requires higher energy handling (≥400 V, 100 ms duration). For Pulse 5a, a dedicated load-dump suppressor or hybrid solution with a TVS plus regulator is required. The 1KSMB27CAH remains effective for all other vehicle-level transients defined in that standard.
What is the maximum reverse leakage current of 1KSMB27CAH at its stand-off voltage?
The maximum reverse leakage current of 1KSMB27CAH is 1.0 µA at VWM = 23.1 V and TA = 25 °C. This low leakage ensures minimal power loss in always-on circuits such as automotive body control modules or IoT sensor nodes operating from battery sources.
Does 1KSMB27CAH require derating at elevated ambient temperatures?
Yes - the 1KSMB27CAH must be derated above TA = 25 °C per Figure 2 in the datasheet. At 85 °C ambient, its 1000 W peak pulse power rating drops to approximately 650 W. Designers must apply this derating when sizing for repeated surge events in high-temperature enclosures like engine compartments or industrial control cabinets.
Can 1KSMB27CAH be used in place of a unidirectional TVS like 1KSMB27AH?
Only if circuit topology supports bi-directional clamping - the 1KSMB27CAH replaces 1KSMB27AH in applications where polarity is undefined or alternating, such as differential data lines or AC-coupled power rails. It cannot substitute in unidirectional configurations requiring forward conduction (e.g., DC output rail with freewheeling path), as its symmetrical structure lacks a dedicated anode/cathode function.
1KSMB27CAH 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:
- -
- Bidirectional Channels:
- 1
- 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)
1KSMB27CAH FAQ
1.How can I place an order for 1KSMB27CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB27CAH 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 1KSMB27CAH reliable?
The price and inventory of 1KSMB27CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB27CAH is usually 5 days.
3.What payment methods are accepted for 1KSMB27CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB27CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB27CAH?
1KSMB27CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB27CAH 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 1KSMB27CAH?
For technical support, including 1KSMB27CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB27CAH requirements.
6.How does Aetrix verify that 1KSMB27CAH is sourced from the original manufacturer or authorized distributors?
All 1KSMB27CAH 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 1KSMB27CAH meets industry standards.
7.What is the process for return or replacement of 1KSMB27CAH?
All 1KSMB27CAH units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB27CAH, 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 1KSMB27CAH part is unused and in its original packaging.
Return procedure for 1KSMB27CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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