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Taiwan Semiconductor Corporation 1KSMB15A
- Part No.:
- 1KSMB15A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB15A.pdf
- Description:
- TVS DIODE 12.8VWM 21.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,915
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Product details
Overview
1KSMB15A from Taiwan Semiconductor is a unidirectional 1000W surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AA (SMB) package, with breakdown voltage 14.3–15.8 V at 1.0 mA test current, stand-off voltage 12.8 V, clamping voltage 21.2 V at 47.2 A peak pulse current, and maximum junction temperature of 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 1KSMB15A datasheet, 1KSMB15A pinout, 1KSMB15A application, or 1KSMB15A equivalent, key selection criteria include unidirectional polarity, 12.8 V working voltage, 21.2 V clamping under 47.2 A surge, DO-214AA thermal resistance (RθJL = 20 °C/W), and compliance with J-STD-020 Level 1 moisture sensitivity.
Technical Context
The 1KSMB15A operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 14.3–15.8 V breakdown range. Its glass-passivated junction enables sub-1.0 ps response time and stable clamping performance across -55 °C to +175 °C junction temperature range.
Designed for automotive and industrial DC input protection, it meets ISO 7637-2 transient immunity requirements (Pulse 1, 2a, 2b, 3a, 3b) and supports 1000 W non-repetitive peak pulse power (10/1000 µs waveform) with 20 °C/W junction-to-lead thermal resistance for effective heat dissipation into PCB copper.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR min/max | 14.3 V / 15.8 V - defines minimum and maximum voltage at which avalanche conduction begins reliably at 1.0 mA test current |
| VWM | 12.8 V - maximum continuous reverse operating voltage before leakage exceeds 5 µA; sets safe DC rail margin |
| VC@IPP | 21.2 V - clamped voltage during 47.2 A 10/1000 µs surge; determines protected circuit's peak overvoltage stress |
| PPPSM | 1000 W - peak pulse power handling capability under standardized 10/1000 µs waveform; defines transient energy absorption limit |
| TJ max | +175 °C - maximum allowable junction temperature; enables operation in high-ambient industrial environments |
| RθJL | 20 °C/W - thermal resistance from junction to lead; informs PCB copper pour design for thermal management |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, single-die unidirectional TVS diode with cathode band marking. Matte tin-plated leads, UL 94V-0 molding compound, JESD 201 Class 2 whisker resistance, weight ≈ 0.110 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND) in unidirectional clamp configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., +12 V rail); conducts avalanche current during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable breakdown voltage and low leakage (<5 µA @ VWM) over lifetime and temperature |
| Sub-1.0 ps response time | Enables suppression of fast ESD and switching transients before downstream ICs experience overstress |
| ISO 7637-2 compliance | Validated for automotive load dump and supply line transients (Pulse 1/2a/2b/3a/3b) |
| J-STD-020 Level 1 moisture sensitivity | Allows standard SMT reflow without pre-bake; simplifies manufacturing flow |
Applications
| Switching Mode Power Supply (SMPS) | AC-DC Adapters |
|---|---|
Use Scenario: Input rectified DC bus in offline SMPS subjected to line surges and load dump transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed across bulk capacitor input to limit transient overvoltage. Use Value: Clamps 10/1000 µs surges to ≤21.2 V while absorbing 1000 W peak power, protecting primary-side controller and MOSFET gate drivers. | Use Scenario: Secondary-side 12 V or 24 V output rail in wall-mounted adapters exposed to system-level ESD and cable discharge events. IC Role / Device Role / Timing Role: Output rail protector located adjacent to connector or load interface. Use Value: Limits output overvoltage to 21.2 V during 47.2 A surge, preventing damage to connected USB-PD controllers or microcontrollers. |
| Television Power Inputs | Monitor DC Power Modules |
Use Scenario: Main 12 V or 19 V input stage of LCD/LED TVs receiving power from external brick adapters. IC Role / Device Role / Timing Role: Primary transient suppressor on main DC input before PFC or buck converter stage. Use Value: Withstands repetitive 1000 W pulses per IEC/EN 61000-4-5 Level 3, maintaining VWM = 12.8 V hold-off during normal operation. | Use Scenario: Standby 5 V or main 12 V rail in flat-panel monitors subject to hot-plug and ESD coupling via HDMI/USB cables. IC Role / Device Role / Timing Role: Point-of-load TVS mounted near power entry connector. Use Value: Provides <5 µA leakage at 12.8 V and clamps fast transients within 1 ps, preserving low-power standby integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ15A (Bourns) | Same DO-214AA package, identical VBR (14.3–15.8 V), but higher VC = 24.4 V @ 41.3 A; RθJA = 110 °C/W vs. 100 °C/W | Lower peak current rating (41.3 A vs. 47.2 A) reduces margin for high-energy transients | Select SMBJ15A only if board layout restricts thermal relief or if legacy Bourns sourcing is required |
| P6SMB15A (ON Semiconductor) | Same electrical specs (VBR, VWM, VC, PPPSM), identical DO-214AA footprint, but rated for J-STD-020 Level 2 moisture sensitivity | Requires bake prior to reflow if stored >1 year; no functional impact in final application | Prefer P6SMB15A when ON Semi supply chain alignment is mandated; otherwise 1KSMB15A offers simpler handling |
Compared with SMBJ15A and P6SMB15A, the 1KSMB15A delivers identical clamping performance with superior thermal resistance (RθJL = 20 °C/W) and Level 1 moisture robustness-enabling direct placement without baking and better sustained power dissipation in compact industrial layouts.
Availability
1KSMB15A is available at Aetrix Electronics and suitable for switching mode power supplies, AC-DC adapters, and television power inputs requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1KSMB15A 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-Q200 qualified product lines.
The 1KSMB series is designed specifically for high-reliability DC transient suppression in automotive and industrial power systems, emphasizing robust surge handling, tight parameter tolerances, and SMT manufacturability.
FAQ
What is the polarity configuration of the 1KSMB15A?
The 1KSMB15A is a unidirectional TVS diode, with cathode marked by a band on the DO-214AA package body. It conducts only during reverse overvoltage events and blocks forward current like a standard rectifier diode. This configuration is confirmed in the "Devices for Bipolar Applications" note specifying CA suffix for bidirectional variants-1KSMB15A lacks the CA suffix and is therefore strictly unidirectional.
Does the 1KSMB15A meet automotive transient standards?
Yes, the 1KSMB15A meets ISO 7637-2 requirements for Pulse 1, 2a, 2b, 3a, and 3b, as explicitly stated in the FEATURES section. Its 1000 W peak pulse power rating, 21.2 V clamping voltage, and sub-1.0 ps response time ensure reliable suppression of load dump and supply line transients encountered in 12 V automotive systems.
What is the maximum steady-state power dissipation for the 1KSMB15A?
The 1KSMB15A has a steady-state power dissipation (PD) of 5 W at TA = 25 °C, as specified in the Absolute Maximum Ratings table. This value decreases with rising ambient temperature per the Pulse Derating Curve (Fig.2), and actual continuous power handling depends on PCB copper area and airflow-junction temperature must remain ≤175 °C.
How does the 1KSMB15A compare to bidirectional versions like 1KSMB15CA?
The 1KSMB15CA is the bidirectional variant, with symmetrical breakdown in both directions and no polarity marking. The 1KSMB15A differs by having unidirectional behavior, cathode band marking, and slightly tighter VBR tolerance (14.3–15.8 V vs. ±5% for CA parts). Use 1KSMB15A where only negative-going transients occur or where polarity-aware clamping is required.
Is the 1KSMB15A RoHS and halogen-free compliant?
Yes, the 1KSMB15A is RoHS compliant and halogen-free per IEC 61249-2-21, as confirmed in the FEATURES section. Its molding compound meets UL 94V-0 flammability rating, and matte tin-plated leads comply with J-STD-002 solderability requirements-ensuring compatibility with lead-free reflow processes.
1KSMB15A 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):
- 12.8V
- Voltage - Breakdown (Min):
- 14.3V
- Voltage - Clamping (Max) @ Ipp:
- 21.2V
- Current - Peak Pulse (10/1000µs):
- 47.2A
- 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)
1KSMB15A FAQ
1.How can I place an order for 1KSMB15A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB15A 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 1KSMB15A reliable?
The price and inventory of 1KSMB15A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB15A is usually 5 days.
3.What payment methods are accepted for 1KSMB15A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB15A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB15A?
1KSMB15A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB15A 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 1KSMB15A?
For technical support, including 1KSMB15A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB15A requirements.
6.How does Aetrix verify that 1KSMB15A is sourced from the original manufacturer or authorized distributors?
All 1KSMB15A 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 1KSMB15A meets industry standards.
7.What is the process for return or replacement of 1KSMB15A?
All 1KSMB15A units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB15A, 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 1KSMB15A part is unused and in its original packaging.
Return procedure for 1KSMB15A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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