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Taiwan Semiconductor Corporation 1KSMB33AH
- Part No.:
- 1KSMB33AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1KSMB33AH.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,820
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Product details
Overview
1KSMB33AH from Taiwan Semiconductor is a unidirectional 1000W surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AA (SMB) package, with breakdown voltage 31.4–34.7 V, stand-off voltage 28.2 V, clamping voltage 45.7 V at 21.9 A, and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the 1KSMB33AH datasheet, 1KSMB33AH pinout, 1KSMB33AH application, or 1KSMB33AH equivalent, key selection factors include its 1000W peak pulse power rating, sub-1 ps response time, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and suitability for high-energy transient suppression in automotive power electronics and industrial control interfaces.
Technical Context
The 1KSMB33AH operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its minimum breakdown threshold of 31.4 V. It clamps transients to ≤45.7 V at 21.9 A (10/1000 µs waveform), limiting energy dissipation across sensitive downstream circuitry.
Its glass-passivated junction ensures stable VBR over temperature and lifetime, while the DO-214AA package provides low thermal resistance (RθJL = 20 °C/W) and supports automated SMT placement per J-STD-002 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR min/max | 31.4 V / 34.7 V - defines minimum and maximum voltage at which avalanche conduction begins under 1 mA test current |
| VWM | 28.2 V - maximum continuous reverse operating voltage before leakage exceeds 1 µA |
| VC@IPP | 45.7 V @ 21.9 A - clamped voltage during 10/1000 µs surge, determining protected circuit's maximum stress level |
| PPPSM | 1000 W - peak pulse power handling capability, enabling protection against high-energy transients like load dump |
| TJ max | +175 °C - maximum junction temperature, supporting operation in under-hood automotive environments |
| Response time | <1.0 ps - enables suppression before transient energy couples into IC inputs or power rails |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, cathode-banded unidirectional configuration. Weight: 0.110 g. Molding compound meets UL 94V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference | Connected to system ground or low-side return path; defines polarity for unidirectional clamping |
| Cathode | Reverse voltage input / Clamping output | Connected to protected line (e.g., 24 V rail); conducts avalanche current to anode during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS power domains |
| Glass passivated junction | Ensures long-term VBR stability and reduced parameter drift under thermal cycling and humidity stress |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (switching noise) immunity requirements |
| Moisture sensitivity level 1 | Enables standard SMT reflow without baking or special handling prior to assembly |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Suppressing load dump transients on 24 V battery-fed ECUs in commercial vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC converter input. Use Value: Limits voltage to ≤45.7 V during 1000 W surges, preventing damage to upstream regulators and microcontrollers. | Use Scenario: Protecting analog front-end inputs of current-sense amplifiers in motor drives. IC Role / Device Role / Timing Role: Clamp ESD and switching noise coupled onto 4–20 mA loop or differential sensor lines. Use Value: Sub-1 ps response prevents latch-up or parametric shift in precision op-amps and ADCs. |
| LED Driver Overvoltage Protection | Telecom Line Card Surge Protection |
Use Scenario: Safeguarding constant-current LED drivers from inductive kickback during PWM dimming. IC Role / Device Role / Timing Role: Placed across driver output terminals to absorb flyback energy from inductive loads. Use Value: 1000 W rating handles repetitive 10/1000 µs pulses common in high-power lighting systems. | Use Scenario: Shielding Ethernet PHY power pins and bias rails from lightning-induced surges on PoE-powered equipment. IC Role / Device Role / Timing Role: Secondary-level TVS on 3.3 V/5 V supply rails feeding communication ICs. Use Value: 28.2 V stand-off voltage avoids false triggering while maintaining margin above nominal rail voltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33A | Same DO-214AA package; VBR = 36.7–40.6 V, VC = 53.3 V @ 18.7 A, PPPM = 600 W | Lower peak power rating limits use in high-energy automotive load dump scenarios | Select SMBJ33A only where 600 W suffices and higher clamping voltage is acceptable |
| 1.5SMC33A | DO-214AB (SMC) package; VBR = 35.1–38.8 V, VC = 53.3 V @ 28.2 A, PPPM = 1500 W | Larger footprint and higher thermal mass; requires PCB layout revision | Choose 1.5SMC33A when 1500 W surge capacity is required and board space permits larger SMC package |
Compared with SMBJ33A and 1.5SMC33A, the 1KSMB33AH delivers optimal balance of 1000 W surge capability, SMB footprint compatibility, and 45.7 V clamping-making it preferred for space-constrained automotive modules needing robust yet compact transient protection.
Availability
1KSMB33AH is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface design, and LED driver protection requiring stable component supply and AEC-Q101-compliant reliability.
Supply support for 1KSMB33AH 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 for automotive, industrial, and consumer markets.
The 1KSMB series was designed specifically for high-reliability transient suppression in harsh automotive environments, emphasizing AEC-Q101 qualification, ISO 7637-2 compliance, and robust thermal performance in compact SMB packages.
FAQ
What is the breakdown voltage range for the 1KSMB33AH?
The 1KSMB33AH has a guaranteed breakdown voltage range of 31.4 V to 34.7 V at 1.0 mA test current, measured per ANSI/IEEE C62.35. This range ensures consistent avalanche initiation across production lots and temperature extremes, critical for predictable clamping behavior in automotive 24 V systems where the 1KSMB33AH is commonly deployed.
Is the 1KSMB33AH suitable for bidirectional transient protection?
No, the 1KSMB33AH is unidirectional. For bidirectional protection, the 1KSMB33CAH variant must be used. The "AH" suffix explicitly denotes unidirectional configuration with cathode band marking, while "CAH" indicates center-tapped bidirectional construction. Using 1KSMB33AH in AC-coupled or dual-polarity signal paths risks failure due to forward conduction during negative transients.
What is the maximum clamping voltage of the 1KSMB33AH under surge conditions?
The 1KSMB33AH clamps to a maximum of 45.7 V when subjected to a 10/1000 µs surge current of 21.9 A. This value is measured at TA = 25°C and defines the upper voltage limit imposed on protected circuitry during worst-case transient events-directly informing system-level voltage tolerance margins for components downstream of the 1KSMB33AH.
Does the 1KSMB33AH meet automotive qualification standards?
Yes, the 1KSMB33AH is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements. These certifications validate its suitability for under-hood and chassis-mounted automotive applications, including engine control units, body control modules, and lighting systems where the 1KSMB33AH serves as primary transient suppression on power rails.
What packaging and reel quantity is available for the 1KSMB33AH?
The 1KSMB33AH is supplied in DO-214AA (SMB) package on 3,000-piece tape-and-reel format, compatible with standard high-speed pick-and-place equipment. The matte tin-plated leads comply with J-STD-002 solderability requirements, and moisture sensitivity level is rated at Level 1 per J-STD-020-eliminating pre-bake requirements prior to reflow soldering.
1KSMB33AH 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):
- 28.2V
- Voltage - Breakdown (Min):
- 31.4V
- Voltage - Clamping (Max) @ Ipp:
- 45.7V
- Current - Peak Pulse (10/1000µs):
- 21.9A
- 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)
1KSMB33AH FAQ
1.How can I place an order for 1KSMB33AH through Aetrix?
Please submit a Request for Quotation (RFQ) for 1KSMB33AH 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 1KSMB33AH reliable?
The price and inventory of 1KSMB33AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1KSMB33AH is usually 5 days.
3.What payment methods are accepted for 1KSMB33AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1KSMB33AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1KSMB33AH?
1KSMB33AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1KSMB33AH 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 1KSMB33AH?
For technical support, including 1KSMB33AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1KSMB33AH requirements.
6.How does Aetrix verify that 1KSMB33AH is sourced from the original manufacturer or authorized distributors?
All 1KSMB33AH 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 1KSMB33AH meets industry standards.
7.What is the process for return or replacement of 1KSMB33AH?
All 1KSMB33AH units undergo pre-shipment inspection (PSI). If there is an issue with 1KSMB33AH, 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 1KSMB33AH part is unused and in its original packaging.
Return procedure for 1KSMB33AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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