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Taiwan Semiconductor Corporation 1KSMB20CAH
- Part No.:
- 1KSMB20CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB20CAH.pdf
- Description:
- TVS DIODE 17.1VWM 27.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,869
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Product details
Overview
1KSMB20CAH from Taiwan Semiconductor is a bi-directional 1000W transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, with breakdown voltage 19.0–21.0 V at 1 mA test current, stand-off voltage 17.1 V, clamping voltage 27.7 V at 36.1 A peak pulse current, and AEC-Q101 qualification for automotive use.
For engineers reviewing the 1KSMB20CAH datasheet, 1KSMB20CAH pinout, 1KSMB20CAH application, or 1KSMB20CAH equivalent, this page delivers verified electrical parameters, bi-directional TVS functionality, ISO 7637-2 compliance, moisture sensitivity level 1, and thermal resistance data critical for ESD and load-dump protection design in automotive and industrial systems.
Technical Context
The 1KSMB20CAH is a bi-directional avalanche diode designed to clamp high-energy transients without polarity dependence. Its glass-passivated junction ensures stable breakdown behavior, and its <1.0 ps response time enables protection against fast electrical fast transients (EFT).
It meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b waveforms and operates across –55°C to +175°C junction temperature range. Thermal resistance is 20°C/W (junction-to-lead) and 100°C/W (junction-to-ambient), supporting surface-mount reliability under sustained surge stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 19.0 V / 21.0 V - defines guaranteed avalanche conduction onset under 1 mA DC test; determines minimum system overvoltage threshold before clamping begins |
| VWM | 17.1 V - maximum continuous reverse operating voltage; must exceed normal circuit operating voltage to prevent leakage or false triggering |
| VC@IPP | 27.7 V @ 36.1 A - clamped voltage during 10/1000 µs surge; directly limits peak stress on downstream ICs during transient events |
| PPPSM | 1000 W - peak pulse power rating for single non-repetitive 10/1000 µs waveform; sets maximum energy absorption capability per event |
| IPP | 36.1 A - peak impulse current corresponding to VC; used to size PCB trace width and verify system-level surge path integrity |
| TJ max | +175 °C - maximum junction temperature; enables operation in under-hood automotive environments and high-ambient industrial enclosures |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, bi-directional configuration with cathode band omitted (no polarity marking required). Matte tin-plated leads, UL 94V-0 molding compound, 0.110 g weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bi-directional avalanche terminals | No fixed anode/cathode; either terminal serves as input/output for transient suppression in AC or floating-bus applications |
| Case (body) | Thermal and mechanical interface | DO-214AA body provides primary heat dissipation path to PCB copper; requires adequate thermal pad area per JEDEC MS-012 |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock - required for engine control, ADAS, and body electronics |
| Glass passivated junction | Stable VBR tolerance and low leakage (<1 µA @ VWM) across lifetime and temperature extremes |
| ISO 7637-2 compliance | Proven immunity to vehicle-level transients (Pulse 1/2a/2b/3a/3b); eliminates need for additional filtering in 12 V/24 V battery systems |
| Moisture sensitivity level 1 | Zero bake requirement prior to reflow; supports standard SMT assembly without floor-life constraints or dry-pack handling |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Suppressing load dump and jump-start surges on 12 V power rails in ECUs, lighting modules, and infotainment head units. IC Role / Device Role / Timing Role: Bi-directional TVS clamping device placed at connector entry point to shunt surge energy before it reaches LDOs, MCUs, or CAN transceivers. Use Value: Limits peak rail voltage to ≤27.7 V during 36.1 A transients, preventing latch-up or permanent damage to 3.3 V/5 V logic supplies. | Use Scenario: Protecting analog front-end inputs of pressure, temperature, or current sensors exposed to ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance (typ. <100 pF at 0 V) bi-directional clamp placed adjacent to sensor IC pins to divert ±8 kV HBM ESD pulses. Use Value: Maintains signal integrity by clamping transients within 1 ps while adding negligible loading to mV-level sensor outputs. |
| DC Motor Drive Transient Suppression | Smart Building Controller I/O Protection |
Use Scenario: Absorbing inductive kickback from brushed DC motors in HVAC actuators, window lifters, and seat adjusters. IC Role / Device Role / Timing Role: Parallel-connected TVS across motor terminals or H-bridge outputs to clamp flyback voltages exceeding 21 V breakdown threshold. Use Value: Prevents MOSFET drain-source avalanche failure and gate oxide stress by limiting VDS spikes to ≤27.7 V at 36.1 A. | Use Scenario: Hardening RS-485, DALI, or KNX bus lines in building automation controllers against lightning-induced surges and ground potential differences. IC Role / Device Role / Timing Role: Bi-directional transient suppressor installed on differential bus pairs to equalize line-to-line and line-to-ground overvoltages. Use Value: Enables robust communication up to 10 Mbps by maintaining common-mode voltage within receiver input range during 1000 W surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20CA | Same DO-214AA package, identical VBR (19.0–21.0 V), but lower PPPSM = 600 W and higher VC = 32.4 V @ 25.5 A | Lower energy handling limits suitability to less severe transients (e.g., board-level ESD only, not ISO 7637-2 Pulse 5a) | Select when cost sensitivity outweighs need for full automotive load-dump margin |
| 1.5SMC20CA | Higher PPPSM = 1500 W, same VBR, but larger DO-214AB (SMC) package (7.11 × 6.22 mm vs. 4.57 × 3.94 mm) | Requires PCB layout change; better for high-volume industrial designs where space is not constrained | Choose when thermal derating margin or multi-pulse endurance is prioritized over footprint size |
Compared with SMBJ20CA and 1.5SMC20CA, the 1KSMB20CAH uniquely balances AEC-Q101 qualification, compact SMB footprint, and full 1000 W ISO 7637-2 compliance - making it optimal for space-constrained automotive modules requiring certified surge resilience without board redesign.
Availability
1KSMB20CAH is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and DC motor drive transient suppression requiring stable component supply and long-term lifecycle support.
Supply support for 1KSMB20CAH 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-compliant production lines.
The 1KSMBxxCAH series is part of TSC's automotive-grade TVS portfolio, engineered specifically for ISO 7637-2-compliant transient suppression in 12 V/24 V vehicle electrical systems - emphasizing reliability, fast response, and surface-mount manufacturability.
FAQ
What does the "CAH" suffix indicate in 1KSMB20CAH?
The "CAH" suffix denotes bi-directional configuration - meaning the 1KSMB20CAH functions identically for positive and negative transients, with no polarity marking required. This distinguishes it from the "AH" variant (uni-directional), which has a cathode band and conducts only in reverse bias. The CAH version is essential for AC-coupled or floating-bus protection where voltage polarity is undefined.
Is 1KSMB20CAH suitable for ISO 7637-2 Pulse 5a (load dump) protection?
Yes, the 1KSMB20CAH is explicitly rated for ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b - but Pulse 5a (load dump) requires higher energy handling (typically >1500 W). While the 1KSMB20CAH's 1000 W rating covers many load dump scenarios, TSC recommends verifying system-level testing per vehicle manufacturer requirements; for full Pulse 5a margin, consider 1.5SMC20CA or stacked TVS solutions.
What is the maximum reverse leakage current for 1KSMB20CAH at its stand-off voltage?
The maximum reverse leakage current for 1KSMB20CAH is 1.0 µA at VWM = 17.1 V and TA = 25°C. This ultra-low leakage ensures minimal power loss in always-on automotive circuits and avoids false triggering in high-impedance sensor bias networks.
Does 1KSMB20CAH require special handling for moisture sensitivity?
No - the 1KSMB20CAH is rated at Moisture Sensitivity Level 1 per J-STD-020, meaning it has unlimited floor life and can be processed using standard SMT reflow profiles without baking or dry-pack storage. This simplifies manufacturing and reduces handling overhead in high-mix automotive production.
How does the thermal performance of 1KSMB20CAH affect PCB layout?
The 1KSMB20CAH has RθJL = 20°C/W and RθJA = 100°C/W, so effective heat dissipation relies heavily on copper area connected to its leads. For reliable 1000 W pulse handling, design ≥40 mm² thermal pads per lead with 2+ internal ground/power planes - insufficient copper will cause localized overheating and premature failure during repetitive surges.
1KSMB20CAH 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):
- 17.1V
- Voltage - Breakdown (Min):
- 19V
- Voltage - Clamping (Max) @ Ipp:
- 27.7V
- Current - Peak Pulse (10/1000µs):
- 36.1A
- 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)
1KSMB20CAH FAQ
1.How can I place an order for 1KSMB20CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB20CAH 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 1KSMB20CAH reliable?
The price and inventory of 1KSMB20CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB20CAH is usually 5 days.
3.What payment methods are accepted for 1KSMB20CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB20CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB20CAH?
1KSMB20CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB20CAH 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 1KSMB20CAH?
For technical support, including 1KSMB20CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB20CAH requirements.
6.How does Aetrix verify that 1KSMB20CAH is sourced from the original manufacturer or authorized distributors?
All 1KSMB20CAH 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 1KSMB20CAH meets industry standards.
7.What is the process for return or replacement of 1KSMB20CAH?
All 1KSMB20CAH units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB20CAH, 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 1KSMB20CAH part is unused and in its original packaging.
Return procedure for 1KSMB20CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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