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Vishay General Semiconductor - Diodes Division TPSMA33AHM3_B/I
- Part No.:
- TPSMA33AHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
TPSMA33AHM3_B/I.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,183
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Product details
Overview
TPSMA33AHM3_B/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) diode designed for clamping inductive switching surges and lightning-induced transients on power and signal lines. It features a 33 V breakdown voltage (VBR = 31.4–34.7 V), 400 W peak pulse power (10/1000 µs), 45.7 V maximum clamping voltage at 8.8 A, and operates up to +185 °C junction temperature - deployed in automotive sensor protection and industrial I/O interfaces.
For engineers reviewing the TPSMA33AHM3_B/I datasheet, TPSMA33AHM3_B/I pinout, TPSMA33AHM3_B/I application, or TPSMA33AHM3_B/I equivalent, key selection criteria include unidirectional polarity, SMA (DO-214AC) package compatibility, AEC-Q101 qualification status, TJ = 185 °C capability, and clamping performance under 10/1000 µs surge conditions.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology optimized for high-temperature stability and low incremental surge resistance. Its unidirectional architecture provides fast response time and excellent clamping with minimal voltage overshoot during transient events.
Rated for 400 W peak pulse power per 10/1000 µs waveform and 40 A non-repetitive forward surge current (8.3 ms half-sine), it supports robust protection in automotive-grade environments where thermal derating above 25 °C must be applied per Figure 2 of the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 31.4 / 33.0 / 34.7 V - defines precise voltage threshold at which avalanche conduction begins under 1 mA test current |
| VWM | 28.2 V - maximum continuous reverse working voltage before leakage exceeds 1 µA at 25 °C |
| VC @ IPPM | 45.7 V - clamped voltage seen across device during 8.8 A 10/1000 µs surge, limiting downstream IC stress |
| PPPM | 400 W - peak transient power handling capacity under standard 10/1000 µs waveform with 0.01 % duty cycle |
| TJ max. | +185 °C - enables operation in under-hood automotive and high-ambient industrial environments without derating failure |
| Polarity | Unidirectional - protects against positive-going transients only; requires correct cathode orientation in PCB layout |
| Package | SMA (DO-214AC) - surface-mount outline with 0.208" x 0.157" footprint, compatible with standard reflow profiles including MSL Level 1 |
Pinout & Package
SMA (DO-214AC) package with molded plastic body, matte tin-plated leads, and cathode band marking. Mounting requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal for rated power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts avalanche current to ground during overvoltage event |
| Anode | Reference node | Typically tied to system ground or lower-potential rail; completes clamping path during surge |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive electronics per stress test requirements including HTOL, TC, and HAST |
| Junction passivation design | Reduces surface leakage and improves long-term reliability under high-humidity and high-temperature bias conditions |
| MSL Level 1 rating | Allows unlimited floor life and compatibility with standard 260 °C peak reflow profile without baking |
| Halogen-free & RoHS-compliant | Meets environmental compliance mandates for automotive and industrial OEM supply chains |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (<1 ns rise time), enhancing protection margin |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load-dump and ESD events in vehicle ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between signal line and chassis ground to shunt surge energy before reaching sensitive interface ICs. Use Value: Clamps 400 W transients at ≤45.7 V while maintaining <1 µA leakage at 28.2 V, preserving signal integrity and enabling AEC-Q100-compliant system design. | Use Scenario: Safeguarding digital input modules in programmable logic controllers exposed to relay coil flyback and field wiring surges. IC Role / Device Role / Timing Role: Standoff protection device mounted at connector entry point to divert inductive kickback away from microcontroller GPIO pins. Use Value: Withstands 40 A 8.3 ms surge and operates reliably up to +185 °C ambient, supporting fanless enclosure designs in harsh factory environments. |
| Consumer Power Adapter Input | Telecom Line Interface Protection |
Use Scenario: Secondary-side DC output protection in AC/DC adapters subjected to conducted surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Fast-response clamping element placed across regulated 5 V/12 V rails to prevent overvoltage damage to USB ports or display drivers. Use Value: Delivers 45.7 V clamping at 8.8 A with <10 ns response time, meeting EN 61000-4-5 Level 3 immunity requirements without adding bulk capacitance. | Use Scenario: Overvoltage suppression on Ethernet PHY or RS-485 transceiver lines in base station equipment exposed to lightning-induced coupling. IC Role / Device Role / Timing Role: Primary-level transient suppressor installed before isolation barrier to limit surge energy entering data interface ICs. Use Value: Maintains <1 µA leakage at 28.2 V while clamping 10/1000 µs surges to 45.7 V, preserving signal eye diagram integrity and reducing bit error rate. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33AHE3_A/H | Same SMA package, 33 V VBR, but rated for 400 W with 1.0 W steady-state PD; not AEC-Q101 qualified | Targeted at commercial/industrial use; lacks automotive qualification and halogen-free certification | Select when AEC-Q101 and halogen-free compliance are not required; lower cost alternative for non-automotive BOMs |
| 1.5SMC33A | Higher 1500 W PPPM, DO-214AB (SMC) package, larger footprint, same VBR range | Used where higher surge energy absorption is needed and board space allows larger SMC outline | Choose for systems requiring >400 W surge handling; requires PCB redesign due to different pad layout and thermal mass |
Compared with SMAJ33AHE3_A/H and 1.5SMC33A, the TPSMA33AHM3_B/I uniquely combines AEC-Q101 qualification, halogen-free construction, and SMA footprint - making it optimal for space-constrained automotive modules where regulatory compliance and thermal resilience are mandatory.
Availability
TPSMA33AHM3_B/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC I/O hardening, and telecom line interface applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for TPSMA33AHM3_B/I 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, TVS devices, and optoelectronics with emphasis on high-reliability and automotive-grade solutions.
The TPSMA series belongs to Vishay's PAR® family of transient voltage suppressors, engineered specifically for high-temperature stability and AEC-Q101-compliant protection in demanding automotive and industrial environments.
FAQ
What is the breakdown voltage tolerance for TPSMA33AHM3_B/I?
The TPSMA33AHM3_B/I has a specified breakdown voltage range of 31.4 V (minimum) to 34.7 V (maximum) at 1.0 mA test current, with a nominal value of 33.0 V. This ±4.7 % tolerance ensures consistent clamping behavior across production lots and supports reliable system-level surge margin calculations in designs using the TPSMA33AHM3_B/I.
Is TPSMA33AHM3_B/I suitable for bidirectional transient protection?
No, the TPSMA33AHM3_B/I is a unidirectional TVS diode and provides protection only against positive-going transients relative to its cathode. It cannot suppress negative excursions or AC-coupled surges. For bidirectional protection, a separate device such as the TPSMA33CAHM3_B/I or dual-diode configuration is required - the TPSMA33AHM3_B/I must be oriented correctly in-circuit with cathode toward the protected line.
Does TPSMA33AHM3_B/I meet automotive qualification standards?
Yes, the HM3 suffix confirms that the TPSMA33AHM3_B/I is AEC-Q101 qualified, having passed stress tests including high-temperature operating life, temperature cycling, and humidity testing. It is certified for use in automotive powertrain, body electronics, and ADAS subsystems where reliability under extended thermal and mechanical stress is critical - a key differentiator of the TPSMA33AHM3_B/I versus commercial-grade alternatives.
What is the maximum clamping voltage of TPSMA33AHM3_B/I under surge conditions?
The TPSMA33AHM3_B/I exhibits a maximum clamping voltage (VC) of 45.7 V when subjected to its rated 8.8 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value represents the worst-case voltage seen by downstream circuitry during surge events and is essential for verifying safe operating margins of protected ICs - the TPSMA33AHM3_B/I maintains this clamping performance across its full operating temperature range.
How does the thermal performance of TPSMA33AHM3_B/I compare to standard SMA TVS diodes?
The TPSMA33AHM3_B/I supports a maximum junction temperature of +185 °C - significantly higher than typical SMA TVS diodes rated to +150 °C - enabling uninterrupted operation in under-hood automotive locations and sealed industrial enclosures. Its thermal derating curve (Figure 2) shows usable power capability up to +175 °C ambient, a key advantage reflected in the TPSMA33AHM3_B/I's suitability for high-reliability applications where thermal headroom is constrained.
TPSMA33AHM3_B/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- PAR®
- 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):
- 8.8A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 185°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
TPSMA33AHM3_B/I FAQ
1.How can I place an order for TPSMA33AHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for TPSMA33AHM3_B/I 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 TPSMA33AHM3_B/I reliable?
The price and inventory of TPSMA33AHM3_B/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPSMA33AHM3_B/I is usually 5 days.
3.What payment methods are accepted for TPSMA33AHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPSMA33AHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPSMA33AHM3_B/I?
TPSMA33AHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPSMA33AHM3_B/I 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 TPSMA33AHM3_B/I?
For technical support, including TPSMA33AHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPSMA33AHM3_B/I requirements.
6.How does Aetrix verify that TPSMA33AHM3_B/I is sourced from the original manufacturer or authorized distributors?
All TPSMA33AHM3_B/I 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 TPSMA33AHM3_B/I meets industry standards.
7.What is the process for return or replacement of TPSMA33AHM3_B/I?
All TPSMA33AHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with TPSMA33AHM3_B/I, 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 TPSMA33AHM3_B/I part is unused and in its original packaging.
Return procedure for TPSMA33AHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TPSMA33AHM3_B/I Tags
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Diodes Incorporated
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Diodes Incorporated
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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