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Taiwan Semiconductor Corporation 1KSMB22A
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- Part No.:
- 1KSMB22A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB22A.pdf
- Description:
- TVS DIODE 18.8VWM 30.6VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,213
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Product details
Overview
1KSMB22A from Taiwan Semiconductor is a unidirectional 1000W transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, with breakdown voltage 20.9–23.1 V at 1.0 mA test current, stand-off voltage 18.8 V, clamping voltage 30.6 V at 32.7 A peak pulse current, and junction temperature range −55 °C to +175 °C. It protects DC power rails in switching mode power supplies, adapters, and display electronics against ESD and surge events per ISO 7637-2.
For engineers reviewing the 1KSMB22A datasheet, 1KSMB22A pinout, 1KSMB22A application, or 1KSMB22A equivalent, key selection criteria include unidirectional polarity, 18.8 V working voltage, 30.6 V clamping under 32.7 A 10/1000 µs surge, DO-214AA thermal resistance (RθJL = 20 °C/W), and compliance with J-STD-020 moisture level 1 and RoHS/halogen-free requirements.
Technical Context
The 1KSMB22A operates as a silicon avalanche diode with glass-passivated junction, delivering sub-1 ps response time from 0 V to VBR(min). Its unidirectional configuration enables asymmetric clamping on positive-going transients only, with forward voltage ≤3.5 V at 50 A for VBR ≤50 V devices.
It meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b automotive transient immunity standards and supports automated SMT placement. Thermal performance is defined by RθJA = 100 °C/W and RθJL = 20 °C/W, enabling reliable operation up to TJ = 175 °C in high-density PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR @ IT = 1.0 mA | 20.9–23.1 V: Ensures precise avalanche initiation threshold for repeatable clamping behavior |
| VWM | 18.8 V: Maximum continuous reverse operating voltage without leakage exceeding 1.0 µA |
| VC @ IPP = 32.7 A | 30.6 V: Clamped voltage during 10/1000 µs surge, limiting downstream IC stress |
| PPPSM | 1000 W: Peak pulse power handling capability under standardized surge waveform |
| TJ Range | −55 °C to +175 °C: Enables deployment in industrial and automotive under-hood environments |
| RθJL | 20 °C/W: Junction-to-lead thermal resistance supports efficient heat conduction to PCB copper |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, single-diode unidirectional configuration with cathode band marking. Matte tin-plated leads, UL 94V-0 molding compound, JESD 201 Class 2 whisker resistance, and 0.110 g typical weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to protected circuit ground or low-side return path in clamp-to-rail topology |
| Cathode | Current exit terminal during reverse-biased clamping | Connected to protected line (e.g., +12 V rail); marked by band for polarity identification |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enhances long-term reliability and stability of VBR under repeated surge stress |
| Sub-1 ps response time | Enables effective suppression of fast ESD transients before sensitive ICs experience overvoltage |
| ISO 7637-2 compliance | Validates robustness against automotive load-dump and inductive-switching transients |
| J-STD-020 Level 1 moisture sensitivity | Eliminates need for baking prior to reflow, simplifying SMT manufacturing flow |
Applications
| Switching Mode Power Supply (SMPS) | AC-DC Adapter |
|---|---|
Use Scenario: Input rectifier output rail protection against line surges and MOSFET switching spikes. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between bulk capacitor and primary-side controller. Use Value: Limits transient voltage to ≤30.6 V during 1000 W surges, preventing controller latch-up or gate oxide damage. | Use Scenario: Secondary-side 12 V or 19 V DC output line protection in wall-mounted adapters. IC Role / Device Role / Timing Role: Standoff-rated (18.8 V) clamping element absorbing coupling noise from primary side or external ESD. Use Value: Maintains regulated output integrity during 32.7 A surge events while drawing <1 µA leakage at nominal voltage. |
| Flat Panel TV Power Board | Computer Monitor DC Input Stage |
Use Scenario: Protection of main 24 V or 48 V logic supply rail against hot-swap and cable discharge events. IC Role / Device Role / Timing Role: Fast-response unidirectional suppressor mounted adjacent to DC input connector. Use Value: Clamps 10/1000 µs transients within 30.6 V, preserving MCU and backlight driver functionality. | Use Scenario: Surge suppression on 12 V auxiliary rail powering USB-C PD interface and display timing controllers. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA @ 18.8 V), high-power (1000 W) TVS integrated into compact SMB footprint. Use Value: Enables compliance with IEC 61000-4-2/4-4 while occupying minimal board area on dense monitor PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ22A (Bourns) | Same DO-214AA package, identical VBR (20.9–23.1 V), but VC = 33.2 V @ 30.1 A - 8.5% higher clamping voltage | Marginally reduced protection level for 12 V systems near absolute maximum ratings | Select when Bourns sourcing preference or dual-sourcing strategy applies; verify system-level clamping margin |
| P6SMB22A (ON Semiconductor) | Identical electrical specs and DO-214AA footprint; differs in JEDEC registration and minor thermal resistance (RθJL = 22 °C/W vs. 20 °C/W) | No functional impact in standard PCB layouts with ≥1 cm² copper pour | Drop-in alternative with full parametric equivalence and same RoHS/halogen-free status |
Compared with SMBJ22A and P6SMB22A, the 1KSMB22A offers the lowest clamping voltage (30.6 V) and best thermal resistance (20 °C/W), making it optimal for space-constrained 12–24 V systems requiring tight voltage margins and high-reliability surge immunity.
Availability
1KSMB22A is available at Aetrix Electronics and suitable for switching mode power supplies, AC-DC adapters, and flat-panel display electronics requiring stable component supply, consistent lead-time visibility, and full traceability across production lots.
Supply support for 1KSMB22A 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 1KSMB22A belongs to TSC's 1000W SMB-series TVS family, engineered for cost-effective, high-reliability transient suppression in industrial power conversion and consumer electronics where ISO 7637-2 compliance and automated assembly are mandatory.
FAQ
What is the polarity configuration of the 1KSMB22A?
The 1KSMB22A is a unidirectional TVS diode, configured with anode and cathode terminals. The cathode is marked by a band on the DO-214AA package body. It conducts in forward bias and clamps only positive transients on the cathode-connected line, making it suitable for DC rail protection where polarity is fixed and known.
Does the 1KSMB22A meet automotive transient immunity standards?
Yes, the 1KSMB22A meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements for automotive electrical systems. Its 1000 W peak pulse power rating and 30.6 V clamping voltage at 32.7 A enable robust protection against load dump, inductive switching, and battery connection transients in 12 V vehicle subsystems.
What is the maximum steady-state power dissipation for the 1KSMB22A?
The 1KSMB22A has a steady-state power dissipation (PD) of 5 W at TA = 25 °C. This rating applies only to continuous DC or low-frequency conditions - its primary function is transient suppression, not sustained power handling. For repetitive surges, derating per Fig.2 in the datasheet must be applied.
Is the 1KSMB22A compatible with lead-free reflow soldering processes?
Yes, the 1KSMB22A features matte tin-plated leads compliant with J-STD-002 for solderability and is rated for lead-free reflow profiles. Its moisture sensitivity level is J-STD-020 Level 1, meaning it can be stored indefinitely at ambient conditions without baking prior to assembly.
How does the 1KSMB22A compare to bidirectional variants like 1KSMB22CA?
The 1KSMB22CA is the bidirectional counterpart with symmetrical clamping for AC or polarity-agnostic lines. The 1KSMB22A provides lower forward voltage (≤3.5 V) and tighter VBR tolerance in unidirectional use cases. Select 1KSMB22A for DC rails with known polarity; choose 1KSMB22CA only when protecting AC-coupled signals or reversible connections.
1KSMB22A 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):
- 18.8V
- Voltage - Breakdown (Min):
- 20.9V
- Voltage - Clamping (Max) @ Ipp:
- 30.6V
- Current - Peak Pulse (10/1000µs):
- 32.7A
- 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)
1KSMB22A FAQ
1.How can I place an order for 1KSMB22A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB22A 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 1KSMB22A reliable?
The price and inventory of 1KSMB22A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB22A is usually 5 days.
3.What payment methods are accepted for 1KSMB22A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB22A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB22A?
1KSMB22A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB22A 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 1KSMB22A?
For technical support, including 1KSMB22A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB22A requirements.
6.How does Aetrix verify that 1KSMB22A is sourced from the original manufacturer or authorized distributors?
All 1KSMB22A 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 1KSMB22A meets industry standards.
7.What is the process for return or replacement of 1KSMB22A?
All 1KSMB22A units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB22A, 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 1KSMB22A part is unused and in its original packaging.
Return procedure for 1KSMB22A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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