My Inquiry
My Account
Taiwan Semiconductor Corporation 1KSMB68CA
.jpg)
- Part No.:
- 1KSMB68CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB68CA.pdf
- Description:
- TVS DIODE 58.1VWM 92VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,374
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1KSMB68CA from Taiwan Semiconductor is a bi-directional 1000W transient voltage suppressor (TVS) in DO-214AA (SMB) package, with breakdown voltage 64.6–71.4 V at 1 mA, stand-off voltage 58.1 V, clamping voltage 92.0 V at 10.9 A, and operating junction temperature range –55 °C to +175 °C. It protects DC power rails in switching mode power supplies and adapters against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the 1KSMB68CA datasheet, 1KSMB68CA pinout, 1KSMB68CA application, or 1KSMB68CA equivalent, key selection criteria include bi-directional clamping capability, 1000 W peak pulse power rating, DO-214AA mechanical compatibility, moisture sensitivity level 1 compliance, and RoHS/halogen-free status for industrial and consumer power electronics design.
Technical Context
This bi-directional TVS diode uses a glass passivated silicon junction to achieve sub-1 ps response time from 0 V to VBR(min), enabling effective suppression of fast-rising automotive and industrial transients. Its symmetrical I-V characteristics support bidirectional surge protection without polarity dependency.
The device meets ISO 7637-2 test requirements for automotive electronics (Pulse 1, 2a, 2b, 3a, 3b) and is rated for 1000 W non-repetitive peak impulse power with 10/1000 µs waveform. Thermal resistance is 20 °C/W (junction-to-lead) and 100 °C/W (junction-to-ambient), supporting reliable operation under sustained surge stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 64.6 V / 71.4 V @ 1 mA - defines minimum and maximum voltage at which device enters avalanche conduction during transient events |
| VWM | 58.1 V - maximum continuous reverse working voltage before leakage exceeds 1 µA; sets safe DC operating margin |
| VC @ IPP | 92.0 V @ 10.9 A - clamped voltage during 1000 W surge, limiting downstream circuit stress |
| PPPSM | 1000 W - peak pulse power handling per 10/1000 µs waveform, critical for automotive load dump immunity |
| Junction Temp Range | –55 °C to +175 °C - enables use in under-hood and industrial environments without derating |
| Package | DO-214AA (SMB) - surface-mount outline with 0.110 g mass, compatible with automated placement and J-STD-002 soldering |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band (not applicable for bi-directional 1KSMB68CA); UL 94V-0 rated compound; weight ≈ 0.110 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional terminal pair | No polarity marking required; terminals interchangeable for AC or dual-rail DC protection |
| Case (body) | Non-electrical mechanical interface | Thermally conductive path to PCB copper; no electrical connection or grounding function |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable VBR tolerance and long-term reliability under repeated surge stress |
| Sub-1 ps response time | Enables clamping before transient energy couples into sensitive downstream ICs |
| ISO 7637-2 compliance | Validated for automotive ECU protection against real-world battery line disturbances |
| Moisture sensitivity level 1 | Eliminates bake-out requirement prior to reflow, reducing manufacturing cost and risk |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU directives for environmentally constrained applications |
Applications
| Switching Mode Power Supply (SMPS) | Automotive Infotainment System |
|---|---|
Use Scenario: Input stage protection against line surges and hot-swap transients in 24 V/48 V industrial SMPS units. IC Role / Device Role / Timing Role: Bi-directional TVS clamp placed across bulk input capacitor to limit transient overvoltage to <92 V. Use Value: Prevents damage to upstream rectifier and downstream PWM controller ICs during 1000 W surge events. | Use Scenario: CAN bus power rail protection in head unit modules exposed to ISO 7637-2 Pulse 2b (battery disconnect). IC Role / Device Role / Timing Role: Standoff-rated TVS on 5 V or 12 V supply rail, responding within <1 ps to suppress coupled transients. Use Value: Maintains system uptime by preventing latch-up or reset of microcontroller and audio codec ICs. |
| AC-DC Adapter | Industrial Monitor Power Input |
Use Scenario: Secondary-side output overvoltage protection in universal-input wall adapters delivering 5–24 V. IC Role / Device Role / Timing Role: Bidirectional clamp between VOUT and GND, absorbing reverse-polarity misconnection energy. Use Value: Enables robust field deployment without requiring polarity-sensitive connectors or additional diode protection. | Use Scenario: Front-panel power entry protection in medical-grade monitors subjected to ESD and lightning-induced surges. IC Role / Device Role / Timing Role: First-line defense on main 24 V input, clamping transients before they reach DC-DC converters and display drivers. Use Value: Achieves >10 kV contact ESD immunity per IEC 61000-4-2 when combined with proper layout and filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ64CA (Bourns) | Same DO-214AA package; VBR = 71.1–78.6 V; VC = 103 V @ 9.7 A; PPPM = 600 W | Lower peak power rating limits suitability for ISO 7637-2 Pulse 1 (load dump) in 24 V systems | Select 1KSMB68CA when 1000 W surge immunity is mandatory; SMBJ64CA fits space-constrained designs needing only 600 W rating |
| P6SMB68CA (ON Semiconductor) | Identical DO-214AA footprint; VBR = 64.6–71.4 V; VC = 92.0 V @ 10.9 A; PPPM = 600 W | Same clamping performance but lower peak power derates faster above 25 °C ambient | Choose 1KSMB68CA for high-temperature or high-reliability deployments where full 1000 W must be sustained |
Compared with SMBJ64CA and P6SMB68CA, the 1KSMB68CA delivers 67% higher peak pulse power (1000 W vs. 600 W) while maintaining identical VBR, VC, and package-making it the preferred choice for automotive and industrial applications demanding full ISO 7637-2 compliance without thermal derating penalties.
Availability
1KSMB68CA is available at Aetrix Electronics and suitable for switching mode power supplies, automotive infotainment systems, and industrial monitor power inputs requiring stable component supply, long-lifecycle availability, and traceable sourcing.
Supply support for 1KSMB68CA 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving global industrial, automotive, and consumer markets since 1979.
The 1KSMBxxCA series belongs to TSC's high-power TVS diode product line, engineered specifically for robust transient immunity in harsh electromagnetic environments including automotive power distribution and industrial power conversion.
FAQ
What does the 'CA' suffix indicate in 1KSMB68CA?
The 'CA' suffix in 1KSMB68CA denotes a bi-directional configuration, meaning the device provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional variants (e.g., 1KSMB68A), the 1KSMB68CA has no cathode marking and can be installed without regard to polarity-ideal for AC-coupled lines or dual-rail DC systems where reverse transients are possible.
Is 1KSMB68CA compliant with automotive transient standards?
Yes, 1KSMB68CA meets ISO 7637-2 requirements for Pulses 1, 2a, 2b, 3a, and 3b, making it suitable for protecting electronic control units in 12 V and 24 V automotive systems. Its 1000 W peak pulse power rating and 92.0 V clamping voltage at 10.9 A ensure robust immunity against load dump and battery disconnection events without requiring additional external components.
What is the maximum clamping voltage of 1KSMB68CA and how is it measured?
The maximum clamping voltage of 1KSMB68CA is 92.0 V, measured at a peak pulse current (IPP) of 10.9 A using a 10/1000 µs waveform. This value represents the upper limit of voltage seen by protected circuitry during a standardized surge event and is guaranteed across the full operating temperature range (–55 °C to +175 °C), ensuring consistent protection in extreme environments.
Does 1KSMB68CA require special handling during PCB assembly?
No, 1KSMB68CA has moisture sensitivity level 1 per J-STD-020, meaning it can be stored indefinitely at ambient conditions and placed directly into reflow without baking. Its matte tin-plated leads comply with J-STD-002 for solderability, and the DO-214AA package supports standard SMT pick-and-place and reflow profiles-reducing process complexity and yield risk in high-volume manufacturing.
How does the thermal performance of 1KSMB68CA compare to similar SMB-package TVS diodes?
1KSMB68CA features a junction-to-lead thermal resistance (RθJL) of 20 °C/W, significantly lower than typical SMB TVS devices (often >30 °C/W). This allows more efficient heat transfer to the PCB copper, enabling sustained operation at higher ambient temperatures and improving reliability during repetitive surge events-especially critical in enclosed power supply enclosures or under-hood automotive locations.
1KSMB68CA 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):
- 58.1V
- Voltage - Breakdown (Min):
- 64.6V
- Voltage - Clamping (Max) @ Ipp:
- 92V
- Current - Peak Pulse (10/1000µs):
- 10.9A
- 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)
1KSMB68CA FAQ
1.How can I place an order for 1KSMB68CA through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB68CA 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 1KSMB68CA reliable?
The price and inventory of 1KSMB68CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB68CA is usually 5 days.
3.What payment methods are accepted for 1KSMB68CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB68CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB68CA?
1KSMB68CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB68CA 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 1KSMB68CA?
For technical support, including 1KSMB68CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB68CA requirements.
6.How does Aetrix verify that 1KSMB68CA is sourced from the original manufacturer or authorized distributors?
All 1KSMB68CA 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 1KSMB68CA meets industry standards.
7.What is the process for return or replacement of 1KSMB68CA?
All 1KSMB68CA units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB68CA, 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 1KSMB68CA part is unused and in its original packaging.
Return procedure for 1KSMB68CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1KSMB68CA Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
