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Vishay General Semiconductor - Diodes Division TPSMA18HE3/5AT
- Part No.:
- TPSMA18HE3/5AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
TPSMA18HE3/5AT.pdf
- Description:
- TVS DIODE 14.5VWM 26.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,729
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Product details
Overview
TPSMA18HE3/5AT from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for clamping inductive switching surges and lightning-induced transients on power and signal lines. It features a 18.0 V nominal breakdown voltage (VBR), 25.5 V maximum clamping voltage (VC) at 15.9 A peak pulse current, 400 W peak pulse power (10/1000 µs), 1.0 W steady-state power dissipation, and operates up to +185 °C junction temperature - deployed in automotive sensor protection and industrial I/O interfaces.
For engineers reviewing the TPSMA18HE3/5AT datasheet, TPSMA18HE3/5AT pinout, TPSMA18HE3/5AT application, or TPSMA18HE3/5AT 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
The TPSMA18HE3/5AT implements passivated anisotropic rectifier technology with junction passivation optimized for high-temperature stability. Its unidirectional architecture provides reverse-biased transient suppression only, requiring correct cathode orientation relative to protected line polarity.
It delivers 400 W peak pulse power per 10/1000 µs waveform at TA = 25 °C with 0.01 % duty cycle, and maintains clamping integrity across -65 °C to +185 °C operating junction range. The device meets MSL Level 1 per J-STD-020 and passes JESD201 Class 2 whisker testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 17.1 V / 18.0 V / 18.9 V at 1 mA - defines precise voltage threshold where avalanche conduction begins under transient stress |
| VWM | 15.3 V - maximum continuous reverse working voltage before leakage exceeds 1 µA, setting safe DC bias limit |
| VC @ IPPM | 25.5 V at 15.9 A - clamped voltage during full 400 W surge, directly limiting downstream IC stress |
| PPPM | 400 W (10/1000 µs) - peak transient energy absorption capacity without failure under standardized surge waveform |
| TJ max. | +185 °C - enables operation in under-hood automotive and high-ambient industrial environments without derating |
| Polarity | Unidirectional - suppresses only reverse-polarity transients; forward conduction not intended for protection |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic case with matte tin-plated leads; cathode indicated by color band; meets UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts avalanche current to ground during overvoltage events |
| Anode | Reference return path | Typically tied to system ground or low-impedance return plane to complete clamping loop |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation optimized design | Enables stable VBR and low leakage (<1 µA at VWM) after 1000 hrs at 150 °C, critical for long-life automotive modules |
| TJ = 185 °C capability | Supports placement near heat sources (e.g., power MOSFETs, motor drivers) without thermal derating in engine control units |
| 400 W peak pulse power (10/1000 µs) | Withstands ISO 7637-2 Pulse 1/2a/5a transients common in 12 V vehicle electrical systems |
| Meets MSL Level 1, peak reflow 260 °C | Allows single-pass lead-free reflow assembly without moisture-related popcorn failure risk |
| AEC-Q101 qualified (HE3 suffix) | Validated for automotive use per stress test requirements including HTGB, H3TRB, and mechanical shock |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
Use Scenario: Protecting microcontroller GPIOs and CAN transceiver power rails from load dump and alternator ripple in BCMs. IC Role / Device Role / Timing Role: Unidirectional TVS clamping element placed between 12 V supply rail and ground, triggered within <1 ns of overvoltage onset. Use Value: Limits rail voltage to ≤25.5 V during 400 W surges, preventing latch-up or permanent damage to 3.3 V/5 V logic and transceivers. | Use Scenario: Shielding 24 V digital input optocouplers from field-wiring induced transients in factory automation cabinets. IC Role / Device Role / Timing Role: Primary surge clamp on dry-contact input lines, mounted directly at connector entry point. Use Value: Maintains <1 µA leakage at 24 V nominal, ensuring clean logic state detection while clamping 1 kV/500 A surges to safe levels. |
| Consumer Appliance Motor Drive Board | Telecom Power Supply Front-End |
Use Scenario: Suppressing back-EMF spikes from brushed DC motors in washing machine control boards. IC Role / Device Role / Timing Role: Fast-response unidirectional suppressor across motor terminals, absorbing inductive kickback energy. Use Value: Withstands repetitive 40 A IFSM surges and clamps VC to 25.5 V, extending MOSFET lifetime and reducing EMI emissions. | Use Scenario: Safeguarding AC-DC converter primary-side controllers against lightning-induced surges on telecom central office power feeds. IC Role / Device Role / Timing Role: Secondary-level transient suppressor on DC bus output, coordinated with upstream MOVs and fuses. Use Value: Provides precise 18 V clamping threshold and 185 °C operation, enabling compact layout in thermally constrained telecom rectifier modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A | Same SMA package, 18 V VBR, but rated for 400 W with 8.3 ms half-sine waveform (not 10/1000 µs); lower clamping ratio | More suited for longer-duration surges like AC line faults; less optimal for fast automotive pulses | Select TPSMA18HE3/5AT when 10/1000 µs compliance and AEC-Q101 qualification are mandatory |
| 1.5SMC18A | Larger SMC (DO-214AB) package; identical 18 V VBR and 400 W rating; higher thermal mass but 2× PCB footprint | Preferred where board space allows and higher IFSM (100 A vs. 40 A) is needed for heavy-inductive loads | Choose TPSMA18HE3/5AT for space-constrained automotive PCBs requiring AEC-Q101 and MSL-1 reflow compatibility |
Compared with SMAJ18A and 1.5SMC18A, the TPSMA18HE3/5AT offers tighter VBR tolerance (±5 % vs. ±10 %), guaranteed AEC-Q101 qualification, and superior high-temperature leakage stability - making it the preferred choice for automotive and high-reliability industrial designs where thermal margin and qualification traceability are critical.
Availability
TPSMA18HE3/5AT is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, and consumer appliance motor control systems requiring stable component supply, AEC-Q101 compliance, and high-temperature operational assurance.
Supply support for TPSMA18HE3/5AT 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 reliability and high-temperature performance.
The TPSMA series belongs to Vishay's PAR® (Protected Avalanche Rectifier) family, engineered specifically for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications demanding AEC-Q101 qualification and 185 °C junction operation.
FAQ
What is the exact breakdown voltage range for TPSMA18HE3/5AT?
The TPSMA18HE3/5AT has a guaranteed breakdown voltage (VBR) range of 17.1 V to 18.9 V at 1 mA test current, with a typical value of 18.0 V. This specification is measured per ANSI/IEEE C62.35 and confirmed in the Vishay datasheet revision 23-Jan-2024 (Document Number: 88405). The tight ±5 % tolerance ensures predictable clamping behavior in safety-critical circuits such as automotive sensor interfaces.
Is TPSMA18HE3/5AT AEC-Q101 qualified?
Yes, the TPSMA18HE3/5AT is AEC-Q101 qualified. The "HE3" suffix explicitly denotes RoHS-compliant and AEC-Q101 qualified construction, validated per the full stress test suite including high-temperature reverse bias (HTRB), temperature cycling, and unbiased highly accelerated stress test (UHAST). This qualification is documented in the official Vishay datasheet for the TPSMA6.8A–TPSMA43A family.
What is the maximum clamping voltage of TPSMA18HE3/5AT under surge conditions?
The maximum clamping voltage (VC) of the TPSMA18HE3/5AT is 25.5 V at 15.9 A peak pulse current (IPPM), tested with a 10/1000 µs waveform. This value represents the upper limit of voltage seen by protected circuitry during worst-case transient events and is critical for ensuring downstream components like microcontrollers or transceivers remain within absolute maximum ratings.
Does TPSMA18HE3/5AT support lead-free reflow soldering?
Yes, the TPSMA18HE3/5AT supports lead-free reflow soldering and is rated for MSL Level 1 per J-STD-020, with a maximum peak reflow temperature of 260 °C. Its matte tin-plated leads comply with J-STD-002 and JESD22-B102, and the device passes JESD201 Class 2 whisker testing - confirming suitability for modern high-volume SMT assembly processes.
What is the polarity configuration of TPSMA18HE3/5AT?
The TPSMA18HE3/5AT is unidirectional only, meaning it functions as a reverse-biased avalanche diode for transient suppression. The cathode is marked by a color band and must be connected toward the side of higher potential (e.g., power rail), while the anode connects to ground or reference. Forward conduction is not part of its protective function and is limited to 3.5 V at 25 A per datasheet specifications.
TPSMA18HE3/5AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- PAR®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 14.5V
- Voltage - Breakdown (Min):
- 16.2V
- Voltage - Clamping (Max) @ Ipp:
- 26.5V
- Current - Peak Pulse (10/1000µs):
- 15.1A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 185°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
TPSMA18HE3/5AT FAQ
1.How can I place an order for TPSMA18HE3/5AT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPSMA18HE3/5AT 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 TPSMA18HE3/5AT reliable?
The price and inventory of TPSMA18HE3/5AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPSMA18HE3/5AT is usually 5 days.
3.What payment methods are accepted for TPSMA18HE3/5AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPSMA18HE3/5AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPSMA18HE3/5AT?
TPSMA18HE3/5AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPSMA18HE3/5AT 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 TPSMA18HE3/5AT?
For technical support, including TPSMA18HE3/5AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPSMA18HE3/5AT requirements.
6.How does Aetrix verify that TPSMA18HE3/5AT is sourced from the original manufacturer or authorized distributors?
All TPSMA18HE3/5AT 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 TPSMA18HE3/5AT meets industry standards.
7.What is the process for return or replacement of TPSMA18HE3/5AT?
All TPSMA18HE3/5AT units undergo pre-shipment inspection (PSI). If there is an issue with TPSMA18HE3/5AT, 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 TPSMA18HE3/5AT part is unused and in its original packaging.
Return procedure for TPSMA18HE3/5AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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