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Taiwan Semiconductor Corporation 1KSMB91CAH
- Part No.:
- 1KSMB91CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB91CAH.pdf
- Description:
- TVS DIODE 77.8VWM 125VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,404
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Product details
Overview
1KSMB91CAH from Taiwan Semiconductor is a bi-directional surface-mount Transient Voltage Suppressor (TVS) in DO-214AA (SMB) package, rated for 1000W peak pulse power, 91V breakdown voltage (min 86.5V, max 95.5V), and clamps to ≤125V at 8.0A peak impulse current. It protects automotive and industrial circuits against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the 1KSMB91CAH datasheet, 1KSMB91CAH pinout, 1KSMB91CAH application, or 1KSMB91CAH equivalent, key selection criteria include bi-directional clamping capability, AEC-Q101 qualification, moisture sensitivity level 1, glass passivated junction, and compliance with IEC 61249-2-21 halogen-free requirements.
Technical Context
The 1KSMB91CAH is a single-die, bi-directional TVS diode designed for high-energy transient suppression in automotive and industrial environments. Its 10/1000µs waveform rating of 1000W and clamping voltage of 125V at 8.0A ensures robust protection against fast electrical fast transients and inductive switching surges.
It features a glass passivated junction for stable VBR tolerance (±5%), fast response time (<1.0 ps), and operates across –55°C to +175°C junction temperature range. Thermal resistance is RθJL = 20°C/W and RθJA = 100°C/W, supporting reliable power dissipation in compact SMB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 86.5V / 95.5V - defines guaranteed breakdown threshold under 1mA test current; enables precise overvoltage trip setting |
| VWM | 77.8V - maximum continuous reverse working voltage; circuit must operate below this to avoid leakage-induced power loss |
| VC@IPP | ≤125V @ 8.0A - clamping voltage during 10/1000µs surge; determines protected IC's maximum stress voltage |
| PPPSM | 1000W - peak pulse power handling; supports high-energy transients per ISO 7637-2 without failure |
| IR@VWM | ≤1.0µA - ultra-low reverse leakage at stand-off voltage; critical for low-power sensor and MCU supply rail protection |
| TJ Range | –55°C to +175°C - extended thermal operating envelope suitable for under-hood automotive placement |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, bi-directional configuration with cathode band omitted (symmetrical terminals).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bi-directional transient path | No polarity marking required; connects across protected line-to-line or line-to-ground without orientation constraint |
| Case (body) | Thermal and mechanical interface | DO-214AA outline provides 0.110g mass and UL 94V-0 molding compound for reflow compatibility and flame resistance |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JESD22 standards |
| Glass passivated junction | Ensures stable VBR tolerance and long-term parameter drift <1% over lifetime under thermal stress |
| Moisture sensitivity level 1 | Enables direct use from dry pack without baking; eliminates production delay in SMT lines |
| ISO 7637-2 compliant | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) waveforms |
| Halogen-free construction | Meets IEC 61249-2-21; supports RoHS-compliant end-product certification and green manufacturing goals |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12V/24V battery-fed ECUs and body control modules from load dump and alternator transients. IC Role / Device Role / Timing Role: Bi-directional TVS placed across power rail and ground to clamp both positive and negative spikes. Use Value: 1KSMB91CAH clamps to ≤125V during 8.0A surge, keeping downstream LDOs and microcontrollers within safe operating area per ISO 7637-2 Pulse 1. | Use Scenario: Safeguarding analog front-end inputs of PLC I/O modules exposed to field wiring transients. IC Role / Device Role / Timing Role: Line-to-line TVS on differential RS-485 or 4–20mA loop inputs to suppress EFT and surge coupling. Use Value: With 1.0µA leakage at 77.8V, 1KSMB91CAH avoids signal offset errors while delivering 1000W surge immunity without derating at 85°C ambient. |
| LED Driver Surge Protection | Automotive CAN Bus Transient Suppression |
Use Scenario: Shielding constant-current LED drivers in headlamp modules from inductive kickback during PWM dimming. IC Role / Device Role / Timing Role: Parallel-connected TVS across driver output to absorb energy from coil flyback and relay bounce. Use Value: Fast <1.0ps response and 125V clamping ensure LED strings remain undamaged during repetitive 100ns–1µs transients common in automotive lighting systems. | Use Scenario: Adding secondary-level protection on CAN_H/CAN_L lines beyond integrated transceiver ESD cells. IC Role / Device Role / Timing Role: Bi-directional TVS pair (one per line) referenced to ground to handle common-mode surges exceeding transceiver limits. Use Value: 1KSMB91CAH's 86.5–95.5V VBR aligns with typical CAN bus common-mode voltage margins, preventing false triggering while maintaining >1kV ESD immunity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ90CA | Breakdown 85.5–94.5V; same DO-214AA package; 1000W rating; VC = 123V @ 8.2A | Slightly lower VBR min and clamping; tighter VBR tolerance (±5% vs ±5.2%) | Select when tighter VBR distribution or marginally lower clamping is needed; verify layout compatibility with identical SMB footprint |
| 1.5KE91CA | Through-hole DO-201 package; same 91V nominal rating; 1500W PPPM; VC = 125V @ 12A | Larger footprint and higher surge capacity; not AEC-Q101 qualified; no MSL-1 rating | Use only in non-automotive, space-tolerant designs where manual assembly or higher single-pulse energy is prioritized over SMT automation |
Compared with SMBJ90CA and 1.5KE91CA, the 1KSMB91CAH offers AEC-Q101 qualification, MSL-1 handling, and optimized thermal performance (RθJL = 20°C/W) for high-volume automotive SMT, making it preferred for under-hood ECUs where reliability and process compatibility are mandatory.
Availability
1KSMB91CAH is available at Aetrix Electronics and suitable for automotive ECU protection, industrial sensor interface hardening, and LED driver surge suppression requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for 1KSMB91CAH 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 1KSMBxxCAH series is part of TSC's automotive-grade SMB TVS platform, engineered specifically for ISO 7637-2 compliance and under-hood deployment in passenger vehicles and commercial trucks.
FAQ
What does the 'CAH' suffix indicate in 1KSMB91CAH?
The 'CAH' suffix denotes a bi-directional configuration with symmetrical anode/cathode terminals and no polarity marking. Unlike 'AH' (uni-directional) variants, 1KSMB91CAH suppresses transients of either polarity across the same two terminals, making it ideal for AC-coupled or differential signal lines such as CAN bus or sensor bridges.
Is 1KSMB91CAH suitable for use in automotive under-hood applications?
Yes, 1KSMB91CAH is AEC-Q101 qualified and rated for junction temperatures up to +175°C. Its DO-214AA package, glass passivated junction, and ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance make it suitable for engine control units, lighting modules, and other under-hood systems where thermal and transient stress are severe.
What is the maximum clamping voltage of 1KSMB91CAH and at what current is it specified?
The maximum clamping voltage of 1KSMB91CAH is 125V, measured at a peak impulse current (IPP) of 8.0A using the standard 10/1000µs waveform. This value guarantees worst-case voltage seen by downstream circuitry during a defined surge event, enabling accurate overvoltage margin analysis in system design.
Does 1KSMB91CAH require baking before reflow soldering?
No, 1KSMB91CAH has a moisture sensitivity level (MSL) of 1 per J-STD-020, meaning it can be used directly from dry pack without pre-baking. This eliminates production delays and moisture-related popcorning risks during lead-free reflow, supporting high-yield automated assembly.
How does the 1KSMB91CAH differ from uni-directional 1KSMB91AH?
1KSMB91CAH is bi-directional with symmetrical terminals and no cathode band, while 1KSMB91AH is uni-directional with marked cathode and forward voltage drop (~3.5V @ 50A). The CAH version clamps both polarities equally and is used where polarity is undefined or bidirectional surges occur; AH is used for DC rail protection with defined polarity.
1KSMB91CAH 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):
- 77.8V
- Voltage - Breakdown (Min):
- 86.5V
- Voltage - Clamping (Max) @ Ipp:
- 125V
- Current - Peak Pulse (10/1000µs):
- 8A
- 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)
1KSMB91CAH FAQ
1.How can I place an order for 1KSMB91CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB91CAH 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 1KSMB91CAH reliable?
The price and inventory of 1KSMB91CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB91CAH is usually 5 days.
3.What payment methods are accepted for 1KSMB91CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB91CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB91CAH?
1KSMB91CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB91CAH 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 1KSMB91CAH?
For technical support, including 1KSMB91CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB91CAH requirements.
6.How does Aetrix verify that 1KSMB91CAH is sourced from the original manufacturer or authorized distributors?
All 1KSMB91CAH 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 1KSMB91CAH meets industry standards.
7.What is the process for return or replacement of 1KSMB91CAH?
All 1KSMB91CAH units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB91CAH, 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 1KSMB91CAH part is unused and in its original packaging.
Return procedure for 1KSMB91CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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