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Taiwan Semiconductor Corporation 1KSMB47A
- Part No.:
- 1KSMB47A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB47A.pdf
- Description:
- TVS DIODE 40.2VWM 64.8VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,750
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Product details
Overview
1KSMB47A from Taiwan Semiconductor is a unidirectional 1000W transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, with breakdown voltage 44.7–49.4 V, stand-off voltage 40.2 V, and clamping voltage 64.8 V at 15.4 A peak pulse current. 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 1KSMB47A datasheet, 1KSMB47A pinout, 1KSMB47A application, or 1KSMB47A equivalent, key selection criteria include unidirectional polarity, 1000 W 10/1000 µs surge rating, 40.2 V working voltage, 64.8 V clamping performance, and SMB surface-mount compatibility for automated placement in industrial and consumer power systems.
Technical Context
The 1KSMB47A operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 44.7–49.4 V breakdown range at 1 mA test current. Its glass-passivated junction ensures stable VBR tolerance and low leakage (<1 µA @ 40.2 V).
Designed for automotive-grade transient immunity, it meets ISO 7637-2 Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line capacitance discharge), with thermal resistance RθJL = 20 °C/W enabling reliable power dissipation in compact layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40.2 V - Maximum continuous reverse operating voltage before leakage exceeds 1 µA |
| VBR min/max | 44.7 V / 49.4 V - Breakdown occurs within this range at 1 mA, defining turn-on threshold |
| VC @ IPP | 64.8 V - Clamps 15.4 A 10/1000 µs surge to ≤64.8 V, limiting downstream stress |
| PPPSM | 1000 W - Peak pulse power handling per standard 10/1000 µs waveform |
| Junction temp | −55 °C to +175 °C - Enables operation in under-hood automotive or high-ambient industrial environments |
| Package | DO-214AA (SMB) - Standard surface-mount outline with matte tin leads, JEDEC-compliant for reflow |
Pinout & Package
DO-214AA (SMB) package: molded plastic body, cathode band marking on one end, lead pitch 2.3 mm, overall dimensions 4.57 × 3.94 × 2.29 mm (L × W × H). Matte tin-plated leads meet J-STD-002 solderability requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side of protected line; conducts during forward surge (e.g., IFSM = 100 A) |
| Cathode (banded end) | Reverse-biased clamping terminal | Connected to higher-potential rail; avalanches into low-impedance state when VREV > VBR |
Key Features
| Feature | Design Value |
|---|---|
| Clamping ratio (VC/VBR) | ≤1.45 - Low overvoltage margin ensures tighter protection of 48 V nominal systems |
| Response time | <1.0 ps - Sub-picosecond junction response enables suppression before IC damage thresholds are exceeded |
| Moisture sensitivity | Level 1 (J-STD-020) - No dry-pack or bake required prior to SMT assembly |
| Flammability rating | UL 94V-0 - Halogen-free molding compound reduces toxic gas emission during fault events |
Applications
| Switching Mode Power Supply (SMPS) | AC-DC Adapters |
|---|---|
Use Scenario: Input rectifier stage subjected to line surges and load-dump transients in 48 V telecom or industrial SMPS. IC Role / Device Role / Timing Role: Unidirectional TVS placed across bulk capacitor or input bridge to clamp negative-going spikes and positive overshoots. Use Value: Limits voltage to ≤64.8 V during 1000 W transients, protecting MOSFETs and controller ICs rated for 80 V max. | Use Scenario: Secondary-side output rail exposed to ESD and fast transient coupling in wall-mounted adapters. IC Role / Device Role / Timing Role: Output-side TVS connected between VOUT and GND to suppress fast-rising noise from cable disconnect or hot-plug events. Use Value: Clamps 15.4 A pulses within 1 ps, preventing latch-up or burnout in USB-PD or multi-output adapter controllers. |
| Television Power Boards | Monitor Backlight Drivers |
Use Scenario: Main 12 V/24 V supply rail in LCD TV power board encountering switching noise from PFC and inverter stages. IC Role / Device Role / Timing Role: TVS mounted near DC-DC converter inputs to absorb repetitive 10/1000 µs transients generated by internal relays and solenoids. Use Value: Withstands ≥1000 surges at rated power and maintains <1 µA leakage at 40.2 V, ensuring no standby current penalty. | Use Scenario: CCFL or LED backlight driver supply experiencing flyback spikes from transformer leakage inductance. IC Role / Device Role / Timing Role: TVS placed across primary winding or post-rectifier to clamp inductive kickback before it reaches PWM controller. Use Value: 64.8 V clamping voltage aligns with typical 65 V MOSFET VDSS, eliminating need for derating or oversized FETs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ47A (Bourns) | Same DO-214AA package, identical VWM = 40.2 V, VC = 64.8 V, but rated for 600 W (not 1000 W) | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 1 without derating | Select 1KSMB47A when full 1000 W 10/1000 µs compliance is required |
| P6SMB47A (ON Semiconductor) | Identical electrical specs and DO-214AA footprint; same 1000 W rating, but moisture sensitivity level 2 (requires baking) | Requires MSL-2 handling protocol; adds process step vs. MSL-1 1KSMB47A | Choose 1KSMB47A for simplified SMT line integration and reduced manufacturing overhead |
Compared with SMBJ47A and P6SMB47A, the 1KSMB47A delivers full 1000 W surge capability with MSL-1 handling and UL 94V-0 halogen-free construction-making it optimal for high-reliability, high-volume automotive and industrial power designs where process simplicity and robustness are jointly critical.
Availability
1KSMB47A is available at Aetrix Electronics and suitable for switching mode power supplies, AC-DC adapters, and television power boards requiring stable component supply, consistent MSL-1 handling, and full ISO 7637-2 compliance.
Supply support for 1KSMB47A 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 1KSMBxxA series is part of TSC's high-power TVS portfolio designed specifically for robust, surface-mount transient protection in automotive power nets and industrial DC distribution systems where reliability under repeated surge stress is mandatory.
FAQ
What is the maximum clamping voltage of the 1KSMB47A under a 10/1000 µs surge?
The 1KSMB47A has a maximum clamping voltage (VC) of 64.8 V when subjected to its rated peak pulse current of 15.4 A using the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees predictable overvoltage limiting for downstream components such as MOSFETs and controllers in 48 V systems.
Is the 1KSMB47A RoHS and halogen-free compliant?
Yes, the 1KSMB47A is RoHS compliant and halogen-free per IEC 61249-2-21. Its molding compound meets UL 94V-0 flammability rating, and all plating and materials are qualified to current environmental directives-critical for export to EU, Japan, and other regulated markets.
Does the 1KSMB47A meet automotive transient standards?
Yes, the 1KSMB47A meets ISO 7637-2 Pulse 1 (load dump), Pulse 2a/2b (supply interruption), and Pulse 3a/3b (capacitive coupling) requirements. Its 1000 W rating, fast <1 ps response, and −55 °C to +175 °C operating range make it suitable for under-hood and powertrain-adjacent applications.
What is the moisture sensitivity level (MSL) of the 1KSMB47A?
The 1KSMB47A has a moisture sensitivity level of MSL-1 per J-STD-020, meaning it can be stored indefinitely at ambient conditions without dry packing or baking prior to reflow soldering-reducing manufacturing complexity and cost versus MSL-2 or higher alternatives.
How does the 1KSMB47A differ from the bi-directional 1KSMB47CA?
The 1KSMB47A is unidirectional (anode-cathode), intended for DC line protection with polarity-sensitive placement, while the 1KSMB47CA is bidirectional (symmetrical breakdown), used where AC or reversible polarity transients occur. They share identical VBR, VC, and PPPSM, but differ in marking (A10U vs. N10U) and circuit role.
1KSMB47A 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:
- 1
- Bidirectional Channels:
- -
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
1KSMB47A FAQ
1.How can I place an order for 1KSMB47A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB47A 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 1KSMB47A reliable?
The price and inventory of 1KSMB47A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB47A is usually 5 days.
3.What payment methods are accepted for 1KSMB47A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB47A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB47A?
1KSMB47A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB47A 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 1KSMB47A?
For technical support, including 1KSMB47A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB47A requirements.
6.How does Aetrix verify that 1KSMB47A is sourced from the original manufacturer or authorized distributors?
All 1KSMB47A 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 1KSMB47A meets industry standards.
7.What is the process for return or replacement of 1KSMB47A?
All 1KSMB47A units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB47A, 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 1KSMB47A part is unused and in its original packaging.
Return procedure for 1KSMB47A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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