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Taiwan Semiconductor Corporation 1KSMB47CAH
- Part No.:
- 1KSMB47CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB47CAH.pdf
- Description:
- TVS DIODE 40.2VWM 64.8VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,696
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Product details
Overview
1KSMB47CAH from Taiwan Semiconductor is a bi-directional 1000W transient voltage suppressor (TVS) in DO-214AA (SMB) package, with 44.7V minimum breakdown voltage (VBR), 40.2V stand-off voltage (VWM), and 64.8V maximum clamping voltage (VC) at 15.4A peak pulse current. It delivers AEC-Q101 qualification and meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive load-dump and ESD protection.
For engineers reviewing the 1KSMB47CAH datasheet, 1KSMB47CAH pinout, 1KSMB47CAH application, or 1KSMB47CAH equivalent, this device serves as a robust, surface-mount bidirectional TVS for high-energy transients in automotive power electronics, lighting control modules, and industrial I/O protection where fast response (<1.0 ps), low leakage (<1 µA @ VWM), and UL 94V-0 molding are critical.
Technical Context
The 1KSMB47CAH employs a glass-passivated silicon junction optimized for bi-directional clamping, enabling symmetrical surge suppression without polarity sensitivity. Its thermal design supports 175°C max junction temperature and achieves 20°C/W junction-to-lead resistance (RθJL), ensuring reliable power dissipation during repetitive 10/1000µs transients.
It operates across -55°C to +175°C ambient range, complies with JESD201 Class 2 whisker resistance, and features matte tin-plated leads solderable per J-STD-002. Moisture sensitivity is rated Level 1 per J-STD-020 - eliminating bake requirements prior to reflow.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 44.7V / 49.4V - defines guaranteed avalanche initiation range under 1mA test current; ensures consistent turn-on across production lots |
| VWM | 40.2V - maximum continuous reverse operating voltage; sets safe DC bias margin before leakage rises above 1µA |
| VC @ IPP | 64.8V @ 15.4A - clamped voltage during 10/1000µs surge; determines protected circuit's worst-case overvoltage exposure |
| PPPSM | 1000W - non-repetitive peak pulse power rating; validates capability to absorb automotive load-dump energy (ISO 7637-2 Pulse 5a) |
| Junction Temp (TJ) | -55°C to +175°C - enables deployment in engine bay, powertrain, and under-hood ECUs without derating |
| Package | DO-214AA (SMB) - industry-standard surface-mount outline with 0.110g mass; compatible with automated pick-and-place and reflow profiles |
Pinout & Package
DO-214AA (SMB) package: molded epoxy case with cathode band marking (bi-directional symmetry means no functional polarity; band denotes terminal orientation only). Matte tin-plated leads meet J-STD-002 solderability; weight ≈0.110g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bi-directional surge path | Both terminals function identically; no DC polarity dependency - simplifies PCB layout and eliminates orientation errors |
| Cathode Band Marking | Physical reference indicator | Visible band aligns with one terminal for mechanical identification only; no electrical asymmetry in 1KSMB47CAH |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for powertrain and body-control modules |
| Glass passivated junction | Enhances long-term stability and moisture resistance vs. epoxy-passivated alternatives; critical for under-hood longevity |
| Fast response time <1.0 ps | Clamps transients before sensitive logic or analog circuitry sustains damage - essential for CAN/LIN bus node protection |
| Meets ISO 7637-2 Pulse 1/2a/2b/3a/3b | Complies with full suite of automotive electrical disturbance tests - qualifies for OEM Tier-1 supplier BOMs without additional validation |
| Halogen-free & RoHS compliant | Fulfills EU ELV and China RoHS material restrictions; supports global vehicle homologation and end-of-life recycling |
Applications
| Automotive Lighting Control | Industrial PLC Digital I/O |
|---|---|
Use Scenario: Protecting LED driver ICs and MOSFET switches from inductive kickback during headlamp or DRL switching. IC Role / Device Role: Bi-directional TVS placed across power rail and ground near load switch output. Use Value: Clamps 64.8V spikes at 15.4A, preventing latch-up or gate oxide rupture in 40V-rated drivers used in 12V/24V systems. | Use Scenario: Safeguarding 24V digital input channels against field-wiring transients and ESD events in factory automation controllers. IC Role / Device Role: Primary surge clamp on signal line between connector and optocoupler/schmitt trigger input stage. Use Value: Withstands 1000W pulses while maintaining <1µA leakage at 40.2V - preserves input threshold accuracy and reduces false triggering. |
| Automotive Body Control Module (BCM) | DC Power Supply Input Protection |
Use Scenario: Suppressing load-dump surges on 12V supply rails feeding microcontrollers and CAN transceivers in door modules or seat controllers. IC Role / Device Role: Secondary clamping device downstream of primary fuse and upstream of LDO regulators. Use Value: 175°C max junction temperature allows placement near heat-generating components; DO-214AA footprint fits tight BCM layouts. | Use Scenario: Guarding AC/DC or DC/DC converter inputs against lightning-induced surges and grid switching transients in telecom or industrial power supplies. IC Role / Device Role: First-line transient absorber on bulk input capacitor rail, before rectifier and filter stages. Use Value: 1000W rating handles 10/1000µs waveforms per IEC 61000-4-5 Level 3; UL 94V-0 compound prevents flame propagation during fault conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ47CA | Same DO-214AA package, identical VBR/VC specs, but not AEC-Q101 qualified | Limited to industrial/commercial use; unsuitable for automotive safety-critical nodes | Select 1KSMB47CAH when automotive qualification or extended temperature operation is mandatory |
| 1.5SMC47CA | Higher 1500W PPPM, larger DO-214AB (SMC) package, same VBR/VC ratings | Better suited for higher-energy surges but requires larger PCB area and different thermal management | Choose 1KSMB47CAH for space-constrained automotive modules where SMB footprint and AEC-Q101 are prioritized over extra power headroom |
Compared with SMBJ47CA and 1.5SMC47CA, the 1KSMB47CAH uniquely combines AEC-Q101 compliance, DO-214AA compactness, and verified ISO 7637-2 immunity - making it the preferred choice for automotive body electronics and industrial controls requiring certified reliability in minimal board space.
Availability
1KSMB47CAH is available at Aetrix Electronics and suitable for automotive lighting control, industrial PLC digital I/O, and DC power supply input protection requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for 1KSMB47CAH 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, and rectifiers, with global distribution and AEC-Q101 validation capabilities.
The 1KSMBxxCAH series was engineered specifically for automotive and industrial transient suppression, emphasizing high-power density, bi-directional symmetry, and robust qualification for harsh-environment deployment.
FAQ
What does the 'CAH' suffix indicate in 1KSMB47CAH?
The 'CAH' suffix in 1KSMB47CAH explicitly denotes a bi-directional configuration, meaning the device provides symmetrical transient suppression across both polarities without requiring orientation-specific placement. This differs from 'AH' variants, which are unidirectional and require correct anode/cathode alignment. The CAH version is essential for AC-coupled or polarity-agnostic protection circuits such as CAN bus lines or dual-rail sensor interfaces.
Is 1KSMB47CAH suitable for protecting a 24V automotive system?
Yes, 1KSMB47CAH is well-suited for 24V automotive systems: its 40.2V stand-off voltage (VWM) provides sufficient margin above nominal 24V and typical 28V alternator regulation, while its 64.8V clamping voltage remains below the absolute maximum ratings of most 36V-tolerant interface ICs. It is validated per ISO 7637-2 Pulse 1/2a/2b/3a/3b - covering all common 24V vehicle transient profiles.
How does the thermal performance of 1KSMB47CAH compare to similar SMB-packaged TVS diodes?
1KSMB47CAH achieves a junction-to-lead thermal resistance (RθJL) of 20°C/W, matching industry-leading SMB TVS devices. This value enables effective heat transfer to the PCB copper pour, supporting sustained operation at elevated ambient temperatures. Its 175°C max junction rating - combined with RθJL - allows reliable handling of repetitive surges in engine compartment environments where other SMB devices may thermally saturate.
Can 1KSMB47CAH be used in place of a unidirectional TVS like 1KSMB47AH?
No - 1KSMB47CAH and 1KSMB47AH are not interchangeable without circuit review. While both share identical VBR, VC, and package, the CAH variant is bi-directional and lacks polarity dependence, whereas the AH variant is unidirectional and must be oriented correctly to conduct reverse surges. Substituting one for the other may result in failed protection or forward conduction during normal operation.
Does 1KSMB47CAH meet halogen-free and RoHS requirements?
Yes, 1KSMB47CAH is fully halogen-free per IEC 61249-2-21 and RoHS compliant, with lead content below 1000 ppm and no restricted substances exceeding EU Directive 2011/65/EU limits. These certifications are documented in TSC's material declarations and support global vehicle type approval and WEEE-compliant end-of-life processing.
1KSMB47CAH 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):
- 40.2V
- Voltage - Breakdown (Min):
- 44.7V
- Voltage - Clamping (Max) @ Ipp:
- 64.8V
- Current - Peak Pulse (10/1000µs):
- 15.4A
- 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)
1KSMB47CAH FAQ
1.How can I place an order for 1KSMB47CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB47CAH 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 1KSMB47CAH reliable?
The price and inventory of 1KSMB47CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB47CAH is usually 5 days.
3.What payment methods are accepted for 1KSMB47CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB47CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB47CAH?
1KSMB47CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB47CAH 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 1KSMB47CAH?
For technical support, including 1KSMB47CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB47CAH requirements.
6.How does Aetrix verify that 1KSMB47CAH is sourced from the original manufacturer or authorized distributors?
All 1KSMB47CAH 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 1KSMB47CAH meets industry standards.
7.What is the process for return or replacement of 1KSMB47CAH?
All 1KSMB47CAH units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB47CAH, 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 1KSMB47CAH part is unused and in its original packaging.
Return procedure for 1KSMB47CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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