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Vishay General Semiconductor - Diodes Division TPSMA18AHE3_A/H
- Part No.:
- TPSMA18AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
TPSMA18AHE3_A/H.pdf
- Description:
- TVS DIODE 15.3VWM 25.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,329
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Product details
Overview
TPSMA18AHE3_A/H 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 18.0 V nominal breakdown voltage (VBR), 400 W peak pulse power (10/1000 µs), 25.5 V maximum clamping voltage at 15.9 A, 1.0 W steady-state power dissipation, and operates up to +185 °C junction temperature - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the TPSMA18AHE3_A/H datasheet, TPSMA18AHE3_A/H pinout, TPSMA18AHE3_A/H application, or TPSMA18AHE3_A/H equivalent, key selection criteria include unidirectional polarity, SMA (DO-214AC) package compatibility, AEC-Q101 qualification status, TJ = 185 °C thermal rating, 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 structure provides fast response time and excellent clamping capability with 0.080 %/°C temperature coefficient of VBR, enabling predictable overvoltage protection across -65 °C to +185 °C operating range.
The device is rated for 40 A non-repetitive forward surge current (8.3 ms half-sine), 1.0 W continuous power dissipation at 25 °C, and meets MSL Level 1 per J-STD-020 with 260 °C lead-free reflow peak. It is RoHS-compliant and AEC-Q101 qualified (HE3 suffix), supporting automotive-grade reliability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 17.1 V / 18.0 V / 18.9 V at 1.0 mA - defines precise voltage threshold where avalanche conduction begins under transient stress |
| VWM | 15.3 V - maximum continuous reverse working voltage before leakage exceeds 1.0 μA at 25 °C |
| VC @ IPPM | 25.5 V at 15.9 A - clamping voltage during 400 W 10/1000 µs surge, limiting downstream IC stress |
| PPPM | 400 W - peak pulse power handling capacity under standardized surge waveform, critical for surge immunity compliance |
| TJ max. | +185 °C - enables operation in under-hood automotive and high-ambient industrial environments without derating |
| Polarity | Unidirectional - protects against positive-going transients only; cathode band denotes terminal polarity |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with 0.208" x 0.157" footprint and matte tin-plated leads |
Pinout & Package
SMA (DO-214AC) package: molded epoxy case meeting UL 94 V-0 flammability rating; terminals are matte tin plated, solderable per J-STD-002 and JESD 22-B102; cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction or clamping | Connected to protected line (e.g., VIN or signal trace); must be routed with low-inductance path to ground reference |
| Cathode | Current exit terminal during clamping; marked with band | Connected to system ground or low-impedance return path; determines unidirectional clamping direction |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier process ensures stable VBR and low leakage over lifetime and temperature |
| AEC-Q101 qualification | Validated for automotive applications including engine control modules and ADAS sensor interfaces |
| MSL Level 1 rating | Supports standard lead-free reflow without moisture sensitivity concerns or baking requirements |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving protection margin for 3.3 V/5 V logic |
| 185 °C junction capability | Enables placement near heat sources (e.g., power MOSFETs, DC/DC converters) without thermal derating |
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 transients before reaching sensitive analog front-end or communication IC. Use Value: Clamps 15.9 A surge to ≤25.5 V, preserving signal integrity and preventing latch-up in 5 V tolerant receivers per ISO 16750-2. |
Use Scenario: Safeguarding 24 V digital input channels on programmable logic controllers against inductive kickback from solenoid valves and relay coils. IC Role / Device Role / Timing Role: Standoff voltage (15.3 V) allows normal 24 V operation while clamping >30 V transients to safe levels within microseconds. Use Value: Withstands 400 W pulses and 40 A surge current, eliminating need for external series impedance in ruggedized factory automation designs. |
| Consumer Power Adapter Input | Telecom Line Interface |
Use Scenario: Secondary-side overvoltage suppression in AC/DC adapters for USB-C PD and laptop chargers exposed to mains-borne surges. IC Role / Device Role / Timing Role: Parallel-connected TVS on +VOUT rail to limit output voltage excursion during feedback loop failure or rectifier short. Use Value: 1.0 W continuous power rating supports sustained fault conditions; 185 °C rating accommodates enclosed thermal environments. |
Use Scenario: Primary protection for Ethernet PHY interface circuits (e.g., RJ45 magnetics secondary side) against lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to local ground plane, suppressing differential-mode transients on data pairs. Use Value: 25.5 V clamping voltage aligns with 3.3 V/5 V PHY absolute maximum ratings; fast response avoids data corruption during sub-100 ns spikes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A | Same SMA package, 18 V VBR, but rated for 400 W with 1.0 mA test current; no AEC-Q101 qualification | Not certified for automotive use; suitable for commercial/industrial grade only | Select when AEC-Q101 is not required and cost sensitivity outweighs qualification needs |
| TPSMA18AHM3_A/H | Identical electrical specs and AEC-Q101 qualification; halogen-free molding compound instead of standard RoHS-compliant compound | Required for strict environmental compliance (e.g., EU automotive Tier 1 supply chains) | Choose when halogen-free material specification is mandated by OEM or regulatory requirement |
Compared with SMAJ18A and TPSMA18AHM3_A/H, the TPSMA18AHE3_A/H delivers identical surge performance and automotive qualification in a RoHS-compliant, non-halogen-free package - making it optimal for cost-sensitive AEC-Q101 applications where halogen content is unrestricted.
Availability
TPSMA18AHE3_A/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O protection, and telecom line interface circuits requiring stable component supply, long-term lifecycle support, and AEC-Q101 compliance.
Supply support for TPSMA18AHE3_A/H 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 TPSMAxxA family is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where AEC-Q101 qualification, 185 °C operation, and consistent clamping are mandatory.
FAQ
What is the breakdown voltage tolerance for TPSMA18AHE3_A/H?
The TPSMA18AHE3_A/H has a guaranteed breakdown voltage range of 17.1 V (minimum) to 18.9 V (maximum) at 1.0 mA test current, with 18.0 V nominal value. This ±5.6% tolerance ensures reliable triggering across production lots and temperature extremes, and is verified per ANSI/IEEE C62.35 standards in the official Vishay datasheet (Doc. #88405).
Is TPSMA18AHE3_A/H compatible with lead-free reflow processes?
Yes, TPSMA18AHE3_A/H meets MSL Level 1 per J-STD-020 and supports peak reflow temperatures up to 260 °C. Its matte tin-plated leads are solderable per J-STD-002 and JESD 22-B102, and the HE3 suffix confirms qualification for standard lead-free assembly without pre-baking or special handling.
Does TPSMA18AHE3_A/H support bidirectional transient suppression?
No, TPSMA18AHE3_A/H is strictly unidirectional. Its internal structure clamps only positive transients relative to cathode. For bidirectional protection, two devices in series opposition or a dedicated bidirectional TVS (e.g., TPSMA18CA) would be required - the datasheet explicitly states "Available in uni-directional polarity only".
What is the maximum clamping voltage of TPSMA18AHE3_A/H under surge conditions?
The TPSMA18AHE3_A/H clamps to a maximum of 25.5 V when subjected to its rated 15.9 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured per Fig. 1 and Table on page 2 of the Vishay datasheet (88405), and defines the upper voltage limit imposed on protected circuitry during surge events.
How does the temperature coefficient affect TPSMA18AHE3_A/H performance?
The TPSMA18AHE3_A/H has a VBR temperature coefficient (αT) of +0.080 %/°C. This means its breakdown voltage increases by approximately 14.4 mV/°C above 25 °C - a predictable, linear shift used to calculate VBR at elevated junction temperatures per the formula in the datasheet, ensuring accurate design margining up to +185 °C.
TPSMA18AHE3_A/H 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):
- 15.3V
- Voltage - Breakdown (Min):
- 17.1V
- Voltage - Clamping (Max) @ Ipp:
- 25.5V
- Current - Peak Pulse (10/1000µs):
- 15.9A
- 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)
TPSMA18AHE3_A/H FAQ
1.How can I place an order for TPSMA18AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for TPSMA18AHE3_A/H 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 TPSMA18AHE3_A/H reliable?
The price and inventory of TPSMA18AHE3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPSMA18AHE3_A/H is usually 5 days.
3.What payment methods are accepted for TPSMA18AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPSMA18AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPSMA18AHE3_A/H?
TPSMA18AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPSMA18AHE3_A/H 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 TPSMA18AHE3_A/H?
For technical support, including TPSMA18AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPSMA18AHE3_A/H requirements.
6.How does Aetrix verify that TPSMA18AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All TPSMA18AHE3_A/H 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 TPSMA18AHE3_A/H meets industry standards.
7.What is the process for return or replacement of TPSMA18AHE3_A/H?
All TPSMA18AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with TPSMA18AHE3_A/H, 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 TPSMA18AHE3_A/H part is unused and in its original packaging.
Return procedure for TPSMA18AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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