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Taiwan Semiconductor Corporation 1KSMB30CAH
- Part No.:
- 1KSMB30CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB30CAH.pdf
- Description:
- TVS DIODE 25.6VWM 41.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,611
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Product details
Overview
1KSMB30CAH from Taiwan Semiconductor is a bi-directional 30V transient voltage suppressor diode in DO-214AA (SMB) package, rated for 1000W peak pulse power, 41.4V clamping voltage at 24.2A, and AEC-Q101 qualified for automotive electronics protection. It features glass passivated junction, <1.0ps response time, and meets ISO 7637-2 Pulse 1/2a/2b/3a/3b.
For engineers reviewing the 1KSMB30CAH datasheet, 1KSMB30CAH pinout, 1KSMB30CAH application, or 1KSMB30CAH equivalent, key selection factors include bi-directional clamping capability, 30V standoff voltage, 41.4V max clamping under 24.2A 10/1000µs surge, AEC-Q101 qualification, and DO-214AA surface-mount compatibility with automated placement.
Technical Context
The 1KSMB30CAH is a bi-directional TVS diode designed to protect sensitive ICs and systems against fast-rising transients such as ESD, EFT, and load dump. Its symmetrical breakdown behavior (VBR min/max = 28.5V/31.5V) enables bidirectional clamping without polarity dependency.
It operates within -55°C to +175°C junction temperature range, delivers 20°C/W junction-to-lead thermal resistance, and maintains ≤1.0µA reverse leakage at 25.6V standoff - critical for low-power sensor and communication interface protection where leakage-induced offset must be minimized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 25.6 V - maximum continuous reverse operating voltage before significant leakage begins |
| VBR (min/max) | 28.5 V / 31.5 V - guaranteed breakdown threshold range at 1mA test current, defining turn-on precision |
| VC @ IPP | 41.4 V at 24.2 A - clamped voltage during 10/1000µs surge, directly limiting stress on downstream circuitry |
| PPPM | 1000 W - peak pulse power handling per single non-repetitive transient event |
| IR @ VWM | ≤1.0 µA - ultra-low leakage ensures minimal DC loading on high-impedance signal lines |
| TJ max | +175 °C - extended thermal rating supports under-hood automotive and industrial environments |
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 (bidirectional) | Transient conduction path | Either terminal serves as anode or cathode depending on transient polarity; no fixed polarity marking required |
| Case (cathode band absent) | Thermal and mechanical interface | DO-214AA molded body provides UL 94V-0 flammability rating and 0.110g mass for thermal mass and reflow stability |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JESD47 |
| Glass passivated junction | Enhances long-term stability and moisture resistance versus epoxy-passivated alternatives |
| Response time <1.0 ps | Clamps transients before propagation into protected ICs - essential for high-speed data line protection |
| Meets ISO 7637-2 Pulse 1/2a/2b/3a/3b | Complies with automotive electrical disturbance immunity standards for battery-powered systems |
| Halogen-free & RoHS compliant | Fulfills IEC 61249-2-21 and EU RoHS Directive requirements for environmentally constrained applications |
Applications
| Automotive Lighting Control | Industrial CAN Bus Interface |
|---|---|
Use Scenario: Protecting LED driver ICs from load-dump transients and alternator ripple in headlamp modules. IC Role / Device Role / Timing Role: Bi-directional clamping device placed across power rail and ground near driver IC input. Use Value: Limits voltage excursion to ≤41.4V during 24.2A surges, preventing latch-up or gate oxide damage in 30V-rated drivers. | Use Scenario: Safeguarding CAN transceiver pins against ESD and coupled noise in factory automation nodes. IC Role / Device Role / Timing Role: Low-capacitance TVS connected between CAN_H/CAN_L differential pair and ground. Use Value: Clamps common-mode transients without distorting signal integrity due to symmetric 28.5–31.5V VBR and sub-µA leakage. |
| Smart Meter Power Input | Automotive Body Control Module (BCM) |
Use Scenario: Shielding microcontroller power supply from lightning-induced surges on AC/DC adapter inputs. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 24V DC input rail upstream of LDO regulators. Use Value: Absorbs 1000W pulses while maintaining ≤25.6V standby operation, enabling robust brownout-free startup after surge. | Use Scenario: Protecting window lift motor driver outputs from inductive kickback during direction reversal. IC Role / Device Role / Timing Role: Bidirectional TVS across motor terminals to clamp reverse EMF in both directions. Use Value: Handles repetitive 24.2A surges at 41.4V clamping, eliminating need for external flyback diodes in H-bridge designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ30CA | Same DO-214AA package, identical 30V VWM and 41.4V VC, but not AEC-Q101 qualified | Lacks automotive qualification; suitable for industrial/commercial only | Select when AEC-Q101 is not required and cost sensitivity outweighs qualification needs |
| 1.5SMC30CA | Higher 1500W PPPM rating, larger DO-214AB (SMC) package, same 30V VWM/41.4V VC | Requires PCB layout change; better for higher-energy transients where space permits | Choose when system-level surge energy exceeds 1000W and board area allows SMC footprint |
Compared with SMBJ30CA and 1.5SMC30CA, the 1KSMB30CAH uniquely combines AEC-Q101 qualification, DO-214AA compactness, and precise 30V bi-directional clamping - making it optimal for space-constrained automotive modules requiring certified reliability without footprint penalty.
Availability
1KSMB30CAH is available at Aetrix Electronics and suitable for automotive lighting control, industrial CAN bus interface, and smart meter power input requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for 1KSMB30CAH 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 for automotive, industrial, and consumer markets.
The 1KSMBxxCAH series is part of TSC's AEC-Q101-qualified TVS portfolio, engineered specifically for robust transient immunity in automotive subsystems where space, reliability, and standard compliance are critical.
FAQ
What does the 'CAH' suffix indicate in 1KSMB30CAH?
The 'CAH' suffix denotes bi-directional configuration - meaning the 1KSMB30CAH functions identically in both polarities, with no cathode marking required. This distinguishes it from uni-directional variants like 1KSMB30AH and enables symmetric clamping across differential or AC-coupled signal paths without polarity concerns.
Is 1KSMB30CAH suitable for protecting CAN FD interfaces?
Yes, the 1KSMB30CAH is suitable for CAN FD interface protection due to its 41.4V clamping voltage, ≤1.0µA leakage at 25.6V, and bi-directional symmetry - all critical for preserving signal integrity on high-speed differential buses. Its AEC-Q101 qualification further validates suitability for automotive CAN FD node designs.
What is the maximum steady-state power dissipation for 1KSMB30CAH?
The maximum steady-state power dissipation for 1KSMB30CAH is 5 W at TA = 25°C, as specified in the Absolute Maximum Ratings table. Derating applies above 25°C ambient per the pulse derating curve (Fig.2), with RθJA = 100°C/W confirming thermal limits under continuous DC bias conditions.
Does 1KSMB30CAH meet moisture sensitivity level (MSL) requirements for lead-free reflow?
Yes, the 1KSMB30CAH is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life and requires no dry-pack or baking prior to lead-free reflow soldering - simplifying manufacturing for high-volume automated assembly lines.
How does the 1KSMB30CAH compare to 1KSMB33CAH in terms of clamping performance?
The 1KSMB30CAH clamps at 41.4V @ 24.2A, while the 1KSMB33CAH clamps at 45.7V @ 21.9A. For circuits with tight voltage margins below 42V, the 1KSMB30CAH provides lower clamping stress; however, the 1KSMB33CAH offers higher standoff (28.2V vs. 25.6V), allowing greater normal operating headroom before conduction begins.
1KSMB30CAH 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):
- 25.6V
- Voltage - Breakdown (Min):
- 28.5V
- Voltage - Clamping (Max) @ Ipp:
- 41.4V
- Current - Peak Pulse (10/1000µs):
- 24.2A
- 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)
1KSMB30CAH FAQ
1.How can I place an order for 1KSMB30CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB30CAH 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 1KSMB30CAH reliable?
The price and inventory of 1KSMB30CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB30CAH is usually 5 days.
3.What payment methods are accepted for 1KSMB30CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB30CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB30CAH?
1KSMB30CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB30CAH 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 1KSMB30CAH?
For technical support, including 1KSMB30CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB30CAH requirements.
6.How does Aetrix verify that 1KSMB30CAH is sourced from the original manufacturer or authorized distributors?
All 1KSMB30CAH 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 1KSMB30CAH meets industry standards.
7.What is the process for return or replacement of 1KSMB30CAH?
All 1KSMB30CAH units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB30CAH, 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 1KSMB30CAH part is unused and in its original packaging.
Return procedure for 1KSMB30CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1KSMB30CAH Tags
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