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Taiwan Semiconductor Corporation 1KSMB36A
- Part No.:
- 1KSMB36A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB36A.pdf
- Description:
- TVS DIODE 30.8VWM 49.9VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,326
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Product details
Overview
1KSMB36A from Taiwan Semiconductor is a unidirectional 1000W transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, with breakdown voltage 34.2–37.8 V at 1 mA, stand-off voltage 30.8 V, clamping voltage 49.9 V at 20 A peak pulse current, and operating junction temperature range of −55 °C to +175 °C. It protects DC power rails in switching mode power supplies against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the 1KSMB36A datasheet, 1KSMB36A pinout, 1KSMB36A application, or 1KSMB36A equivalent, key selection criteria include unidirectional polarity, 30.8 V working voltage, 49.9 V clamping under 20 A 10/1000 µs surge, DO-214AA thermal resistance (RθJL = 20 °C/W), and compliance with J-STD-020 moisture sensitivity level 1.
Technical Context
The 1KSMB36A employs a glass-passivated silicon junction optimized for fast transient response (<1.0 ps rise time from 0 V to VBR min) and robust clamping performance under repetitive and non-repetitive surge conditions. Its unidirectional configuration provides forward conduction capability with VF ≤ 3.5 V at 50 A, enabling bidirectional protection when paired with complementary devices.
Designed for automotive-grade EMC resilience, it meets ISO 7637-2 Pulse 1 (inductive load dump suppression), Pulse 2a/2b (battery disconnect/relay bounce), and Pulse 3a/3b (capacitive coupling noise). Thermal design leverages low RθJL (20 °C/W) for PCB copper pour-assisted heat dissipation in high-density SMPS layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30.8 V - Maximum continuous reverse working voltage before leakage exceeds 1 µA; sets upper limit for protected line voltage. |
| VBR @ IT = 1 mA | 34.2–37.8 V - Breakdown voltage range defining onset of avalanche conduction; ensures reliable turn-on above normal operating voltage. |
| VC @ IPP = 20 A | 49.9 V - Clamped voltage during 10/1000 µs surge; determines maximum stress on downstream ICs like controllers or MOSFETs. |
| PPPSM | 1000 W - Peak pulse power rating per 10/1000 µs waveform; defines single-event surge energy handling capacity. |
| RθJL | 20 °C/W - Junction-to-lead thermal resistance; enables direct thermal path to PCB copper for sustained surge duty cycles. |
| Junction Temp Range | −55 °C to +175 °C - Operational temperature envelope supporting under-hood automotive and industrial ambient conditions. |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, matte tin-plated leads, polarity indicated by cathode band, weight ≈ 0.110 g, UL 94V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path | Connected to ground or low-impedance return plane; carries full IPP during clamping. |
| Cathode | Protected line connection | Connected to input rail (e.g., 24 V DC bus); voltage referenced to anode during transient suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure. |
| Response time < 1.0 ps | Enables suppression of nanosecond-scale ESD and fast-rising load dump edges before sensitive circuitry reacts. |
| ISO 7637-2 compliance | Validates performance against standardized automotive transient waveforms without external filtering or derating. |
| J-STD-020 Level 1 MSL | Permits unlimited floor life and standard reflow without baking, simplifying SMT manufacturing flow. |
Applications
| Switching Mode Power Supply (SMPS) | Industrial DC Adapter |
|---|---|
Use Scenario: Input stage protection against inductive kickback and line surges in 24 V/48 V isolated flyback converters. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed across primary-side bulk capacitor or DC input terminals. Use Value: Limits transient overshoot to ≤49.9 V during 20 A surges, preventing overvoltage failure of primary-side controller ICs and MOSFETs. | Use Scenario: Overvoltage protection on secondary-side 12 V/24 V output rails supplying PLC I/O modules. IC Role / Device Role / Timing Role: Standoff-rated protector mounted adjacent to connector interface to absorb hot-plug and cable discharge events. Use Value: Maintains 30.8 V working margin while clamping to 49.9 V, preserving regulation integrity during 10/1000 µs transients up to 1000 W. |
| Automotive Infotainment Display | Commercial Monitor Power Input |
Use Scenario: Protection of 12 V power feed to LCD backlight drivers and video processing SoCs subject to battery load dump. IC Role / Device Role / Timing Role: Primary-line TVS on main board power entry, coordinated with fuse and common-mode choke. Use Value: Withstands ISO 7637-2 Pulse 5a (load dump) up to 1000 W without degradation, ensuring system-level EMC certification pass. | Use Scenario: Input surge suppression for 19 V DC power inputs in office monitors exposed to shared building power disturbances. IC Role / Device Role / Timing Role: Unidirectional clamp between DC jack and upstream DC-DC converter input capacitor. Use Value: Provides 49.9 V clamping ceiling at 20 A, preventing latch-up or gate oxide rupture in synchronous buck controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ36A (Bourns) | Same DO-214AA package, identical VWM (30.8 V), VC = 58.1 V @ 17.3 A - higher clamping voltage, lower IPP rating. | Less effective clamping headroom for 24 V systems near 30 V max; requires verification of downstream IC absolute max ratings. | Select SMBJ36A only if layout constraints demand identical footprint and clamping margin >58 V is acceptable. |
| P6SMB36A (ON Semiconductor) | DO-214AA, VWM = 30.8 V, VC = 49.9 V @ 20 A - identical clamping, but RθJA = 110 °C/W vs. TSC's 100 °C/W. | Slightly reduced thermal margin in high-ambient or high-duty-cycle surge environments; otherwise functionally interchangeable. | P6SMB36A is suitable where thermal derating is not critical; prefer 1KSMB36A for extended lifetime in 70+ °C ambient designs. |
Compared with SMBJ36A and P6SMB36A, the 1KSMB36A delivers identical clamping performance (49.9 V @ 20 A) with superior thermal resistance (RθJL = 20 °C/W) and tighter VBR tolerance (±5.2%), making it optimal for space-constrained, thermally demanding 24 V industrial and automotive power interfaces.
Availability
1KSMB36A is available at Aetrix Electronics and suitable for switching mode power supplies, industrial DC adapters, and automotive infotainment displays requiring stable component supply, RoHS-compliant packaging, and ISO 7637-2 certified transient immunity.
Supply support for 1KSMB36A 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 engineered for high-energy transient suppression in automotive and industrial power systems, emphasizing fast response, repeatable clamping, and robust thermal performance in surface-mount SMB packages.
FAQ
What is the maximum clamping voltage of the 1KSMB36A under a 10/1000 µs surge?
The 1KSMB36A has a maximum clamping voltage (VC) of 49.9 V when subjected to a 20 A peak pulse current with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 standards and represents the upper voltage limit imposed on protected circuitry during worst-case transient events, directly impacting downstream IC survivability.
Is the 1KSMB36A suitable for bidirectional transient protection?
No - the 1KSMB36A is a unidirectional TVS diode intended for DC line protection with defined anode/cathode polarity. For bidirectional AC or dual-polarity DC protection, the 1KSMB36CA variant must be used. Using 1KSMB36A in reverse-biased configurations risks permanent breakdown due to lack of symmetrical avalanche structure.
What is the standoff voltage (VWM) specification for the 1KSMB36A?
The standoff voltage (VWM) for the 1KSMB36A is 30.8 V, meaning it remains in high-impedance state with ≤1 µA leakage current up to this DC or RMS voltage. This parameter ensures compatibility with 24 V nominal systems while providing sufficient margin above normal operating voltage to avoid false triggering during ripple or tolerance drift.
Does the 1KSMB36A meet automotive EMC requirements?
Yes - the 1KSMB36A is explicitly rated to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test waveforms, covering load dump, supply interruption, and capacitive coupling transients common in 12 V/24 V vehicle electrical systems. Its 1000 W peak power rating and fast <1.0 ps response ensure compliance without additional filtering components.
What is the thermal resistance from junction to lead (RθJL) for the 1KSMB36A?
The junction-to-lead thermal resistance (RθJL) of the 1KSMB36A is 20 °C/W, measured under standard JEDEC test conditions. This low value enables efficient heat transfer from the silicon die to the PCB copper via the cathode/anode leads, supporting reliable operation during repeated surge events in compact, high-power-density layouts.
1KSMB36A 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):
- 30.8V
- Voltage - Breakdown (Min):
- 34.2V
- Voltage - Clamping (Max) @ Ipp:
- 49.9V
- Current - Peak Pulse (10/1000µs):
- 20A
- 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)
1KSMB36A FAQ
1.How can I place an order for 1KSMB36A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB36A 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 1KSMB36A reliable?
The price and inventory of 1KSMB36A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB36A is usually 5 days.
3.What payment methods are accepted for 1KSMB36A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB36A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB36A?
1KSMB36A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB36A 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 1KSMB36A?
For technical support, including 1KSMB36A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB36A requirements.
6.How does Aetrix verify that 1KSMB36A is sourced from the original manufacturer or authorized distributors?
All 1KSMB36A 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 1KSMB36A meets industry standards.
7.What is the process for return or replacement of 1KSMB36A?
All 1KSMB36A units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB36A, 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 1KSMB36A part is unused and in its original packaging.
Return procedure for 1KSMB36A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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