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Taiwan Semiconductor Corporation 1KSMB91CA
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- Part No.:
- 1KSMB91CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB91CA.pdf
- Description:
- TVS DIODE 77.8VWM 125VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,341
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Product details
Overview
1KSMB91CA from Taiwan Semiconductor is a bi-directional 1000W transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, with breakdown voltage 86.5–95.5 V at 1 mA, stand-off voltage 77.8 V, clamping voltage 125 V at 8.0 A peak pulse current, and operating junction temperature range of –55°C to +175°C. It protects power supplies and interface lines against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the 1KSMB91CA datasheet, 1KSMB91CA pinout, 1KSMB91CA application, or 1KSMB91CA equivalent, key selection criteria include bi-directional clamping capability, 1000W peak pulse power rating, DO-214AA mechanical compatibility, moisture sensitivity level 1 compliance, and RoHS/halogen-free status for automotive and industrial board-level surge protection.
Technical Context
The 1KSMB91CA is a glass-passivated, single-die, bi-directional TVS diode designed for unidirectional and bidirectional transient suppression without polarity dependency. Its fast response time (<1.0 ps from 0 V to VBR min) and low clamping ratio (VC/VBR ≈ 1.30–1.45) ensure effective overvoltage limiting during fast-rising ESD or load-dump events.
It meets ISO 7637-2 test requirements for automotive electronics, supports steady-state power dissipation of 5 W at 25°C, and features JESD201 Class 2 whisker resistance and UL 94V-0 mold compound - enabling reliable use in harsh ambient environments up to 175°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 86.5 V / 95.5 V at 1 mA - defines minimum and maximum voltage at which device enters avalanche conduction under standardized test conditions |
| VWM | 77.8 V - maximum continuous reverse working voltage before leakage exceeds 1 µA; sets system operating margin below breakdown |
| VC@IPP | 125 V at 8.0 A - clamping voltage during 10/1000 µs surge; determines protected circuit's maximum transient exposure level |
| PPPSM | 1000 W - peak pulse power handling per 10/1000 µs waveform; enables robust protection against high-energy automotive transients |
| TJ Range | –55°C to +175°C - full operational junction temperature range; supports under-hood and industrial control applications |
| Package | DO-214AA (SMB) - surface-mount outline with 0.110 g mass, matte tin-plated leads, and J-STD-002 solderability |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with cathode band marking for unidirectional variants; bi-directional 1KSMB91CA has no polarity marking - terminals are symmetrical and interchangeable. Leads are matte tin-plated, compliant with J-STD-002 solderability and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bi-directional transient path | Either terminal serves as input/output for surge current; no polarity dependency enables flexible PCB layout |
| Case (body) | Non-electrical mechanical reference | Non-conductive SMB body provides thermal path to PCB copper and mechanical mounting stability |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity stress |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validates suitability for automotive power line surge immunity without additional external filtering components |
| Moisture sensitivity level 1 | Eliminates bake preconditioning prior to reflow; supports standard SMT assembly without floor-life restrictions |
| RoHS & halogen-free (IEC 61249-2-21) | Meets global environmental compliance mandates for consumer, industrial, and automotive end equipment |
Applications
| Automotive Power Line Protection | Industrial SMPS Input Stage |
|---|---|
Use Scenario: Protecting 12 V/24 V vehicle battery-fed ECUs from load dump and alternator switching transients. IC Role / Device Role / Timing Role: Bi-directional TVS diode placed across power rail and ground to clamp surges before they reach downstream regulators and microcontrollers. Use Value: Withstands 1000 W peak pulses and clamps to ≤125 V, preventing damage to 36 V-rated DC-DC converters and CAN transceivers. | Use Scenario: Safeguarding AC-DC adapter front-end rectifiers and PFC stages against lightning-induced surges and inductive kickback. IC Role / Device Role / Timing Role: Standoff-rated TVS connected between live/neutral and earth to shunt high-voltage spikes during mains disturbances. Use Value: 77.8 V stand-off voltage allows operation with 72 V peak rectified input while maintaining <1 µA leakage at full rated voltage. |
| Consumer Display Power Rails | Point-of-Sale Terminal Interface Lines |
Use Scenario: Securing internal 12 V/19 V power distribution in LCD monitors and digital signage against hot-swap and cable discharge events. IC Role / Device Role / Timing Role: Localized TVS on each power domain to limit transient propagation between modules and prevent latch-up in display controllers. Use Value: Fast <1.0 ps response ensures clamping initiates before 10 ns ESD pulses propagate into sensitive timing ICs or FPGAs. | Use Scenario: Protecting RS-232/RS-485 communication ports in retail kiosks from electrostatic discharge and ground loop surges. IC Role / Device Role / Timing Role: Bi-directional TVS placed across differential pairs and shield to absorb common-mode and differential-mode transients. Use Value: Symmetrical terminal design eliminates polarity concerns during manual assembly and field repair, reducing BOM complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ90CA (Bourns) | VBR = 90–100 V, VC = 125 V @ 8.0 A, same DO-214AA package | Identical clamping performance but tighter VBR tolerance (±5% vs ±5.2% for 1KSMB91CA); slightly higher VWM (81.0 V) | Preferred where tighter breakdown consistency is required; compatible in same footprint with identical thermal derating |
| P6SMB91CA (Littelfuse) | VBR = 86.5–95.5 V, VC = 125 V @ 8.0 A, DO-214AA, but RθJA = 110°C/W (vs 100°C/W for 1KSMB91CA) | Same electrical specs but lower thermal efficiency; requires larger copper pour for equivalent power dissipation | Acceptable for low-duty-cycle surge events; verify thermal margin in high-ambient designs using P6SMB91CA |
Compared with SMBJ90CA and P6SMB91CA, the 1KSMB91CA offers optimal balance of clamping precision, thermal resistance (100°C/W), and moisture sensitivity level 1 - making it especially suitable for high-volume automotive and industrial SMT production where assembly robustness and thermal headroom are critical.
Availability
1KSMB91CA is available at Aetrix Electronics and suitable for automotive power line protection, industrial SMPS input stages, consumer display power rails, and point-of-sale terminal interface lines requiring stable component supply and full compliance with ISO 7637-2 and RoHS/halogen-free standards.
Supply support for 1KSMB91CA 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 ISO/TS 16949 certification and global distribution.
The 1KSMB91CA belongs to TSC's 1KSMBxxCA bi-directional TVS family, engineered specifically for high-reliability, high-energy transient suppression in automotive and industrial environments where ISO 7637-2 compliance and extended temperature operation are mandatory.
FAQ
What is the breakdown voltage range of the 1KSMB91CA?
The 1KSMB91CA has a specified breakdown voltage range of 86.5 V to 95.5 V at 1 mA test current, measured per ANSI/IEEE C62.35. This range reflects manufacturing tolerance and ensures consistent avalanche initiation across production lots while maintaining compatibility with 77.8 V stand-off voltage requirements in 12 V/24 V systems.
Is the 1KSMB91CA unidirectional or bi-directional?
The 1KSMB91CA is a bi-directional TVS diode, indicated by the "CA" suffix per Taiwan Semiconductor's ordering convention. Unlike unidirectional variants (e.g., 1KSMB91A), it conducts symmetrically in both polarities and has no cathode band marking - enabling use in AC-coupled or floating signal paths without polarity orientation constraints.
What is the maximum clamping voltage of the 1KSMB91CA under surge conditions?
The 1KSMB91CA exhibits a maximum clamping voltage of 125 V when subjected to an 8.0 A peak impulse current with a 10/1000 µs waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during standardized surge events per IEC 61000-4-5 and ISO 7637-2.
Does the 1KSMB91CA meet automotive surge immunity standards?
Yes, the 1KSMB91CA meets ISO 7637-2 requirements for Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling), verified through standardized test waveforms. Its 1000 W peak pulse rating and fast sub-picosecond response make it suitable for protecting ECUs, body control modules, and infotainment systems in modern vehicles.
What is the thermal resistance specification for the 1KSMB91CA?
The 1KSMB91CA has a junction-to-ambient thermal resistance (RθJA) of 100°C/W and a junction-to-lead thermal resistance (RθJL) of 20°C/W, measured under standard JEDEC test conditions. These values enable accurate thermal modeling for PCB layout - for example, a 5 W steady-state dissipation yields ~500°C rise above ambient without heatsinking, confirming its intended use for transient-only duty cycles.
1KSMB91CA 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
1KSMB91CA FAQ
1.How can I place an order for 1KSMB91CA through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB91CA 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 1KSMB91CA reliable?
The price and inventory of 1KSMB91CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB91CA is usually 5 days.
3.What payment methods are accepted for 1KSMB91CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB91CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB91CA?
1KSMB91CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB91CA 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 1KSMB91CA?
For technical support, including 1KSMB91CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB91CA requirements.
6.How does Aetrix verify that 1KSMB91CA is sourced from the original manufacturer or authorized distributors?
All 1KSMB91CA 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 1KSMB91CA meets industry standards.
7.What is the process for return or replacement of 1KSMB91CA?
All 1KSMB91CA units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB91CA, 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 1KSMB91CA part is unused and in its original packaging.
Return procedure for 1KSMB91CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1KSMB91CA Tags
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