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Vishay General Semiconductor - Diodes Division TPSMA18AHE3/5AT
- Part No.:
- TPSMA18AHE3/5AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
TPSMA18AHE3/5AT.pdf
- Description:
- TVS DIODE 15.3VWM 25.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,410
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Product details
Overview
TPSMA18AHE3/5AT from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features a 18.0 V nominal breakdown voltage (VBR), 15.3 V stand-off voltage (VWM), 25.5 V maximum clamping voltage (VC) at 5.0 A peak pulse current, 400 W peak pulse power (10/1000 μs), and operates up to +185 °C junction temperature - ideal for automotive power rail protection.
For engineers reviewing the TPSMA18AHE3/5AT datasheet, TPSMA18AHE3/5AT pinout, TPSMA18AHE3/5AT application, or TPSMA18AHE3/5AT equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification status, clamping performance under 10/1000 μs surge, thermal derating above 25 °C, and compatibility with standard SMA PCB pad layouts per JESD22-B102 solderability requirements.
Technical Context
The TPSMA18AHE3/5AT uses passivated anisotropic rectifier technology to deliver stable breakdown behavior and low incremental surge resistance. Its 185 °C maximum junction temperature enables operation in high-temperature automotive engine compartments and industrial control enclosures without thermal derating penalties beyond those specified in Fig. 2 of the datasheet.
It is rated for 400 W peak pulse power with 10/1000 μs waveform at 0.01 % duty cycle and exhibits 0.080 %/°C temperature coefficient of VBR, ensuring predictable clamping voltage shift across its full operating range. The device meets MSL Level 1 per J-STD-020 and supports lead-free reflow up to 260 °C peak.
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 reliably |
| VWM | 15.3 V - maximum continuous reverse voltage before leakage exceeds 1.0 μA, sets safe operating margin below VBR |
| VC @ IPPM | 25.5 V at 5.0 A - clamping voltage during 10/1000 μs surge, determines protected circuit's worst-case overvoltage exposure |
| PPPM | 400 W - peak transient energy handling capacity, directly limits survivable surge magnitude per pulse |
| TJ max. | +185 °C - enables placement near heat sources (e.g., power MOSFETs, DC/DC converters) without derating loss |
| Polarity | Unidirectional - protects against positive-going transients only; requires correct cathode orientation toward protected line |
| 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 with axial lead configuration: molded plastic body, cathode band marking on one end, and two coplanar matte tin-plated terminals suitable for reflow soldering per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when VLINE exceeds VBR |
| Anode | Reference node | Typically tied to system ground or low-impedance return path; completes clamping loop during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for under-hood ECUs |
| Junction passivation | Optimized die surface treatment ensures stable VBR and low leakage (<1.0 μA at VWM) over lifetime and temperature |
| MSL Level 1 rating | Zero floor life limitation; supports unlimited storage and single-reflow processing at 260 °C peak without preconditioning |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., ISO 7637-2 Pulse 1/2a), improving protection margin |
| 185 °C TJ capability | Enables use in high-ambient environments (e.g., battery management systems, motor drives) without external heatsinking |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Clamping |
|---|---|
Use Scenario: Suppresses load dump and alternator ripple transients on 12 V battery-fed ECUs in passenger vehicles. IC Role / Device Role / Timing Role: TVS diode placed between power input and chassis ground to clamp surges above 15.3 V. Use Value: Limits peak voltage to ≤25.5 V during 400 W pulses, preventing damage to downstream LDOs and microcontrollers. |
Use Scenario: Protects analog outputs of pressure/temperature sensors in factory automation PLC modules. IC Role / Device Role / Timing Role: Unidirectional TVS connected across sensor output and reference ground to absorb ESD and switching noise. Use Value: Maintains signal integrity by clamping transients within 1 ns response time while adding <1 pF capacitance at 0 V bias. |
| Consumer Power Adapter Input Stage | Telecom DC Power Feed Protection |
Use Scenario: Guards AC/DC adapter primary-side input against lightning-induced surges entering via mains lines. IC Role / Device Role / Timing Role: Mounted between bridge rectifier output and bulk capacitor to clamp differential-mode spikes. Use Value: Withstands repetitive 400 W pulses at 0.01 % duty cycle, extending capacitor and controller IC lifetime. |
Use Scenario: Safeguards PoE-powered equipment (e.g., IP cameras, wireless APs) from induced surges on 48 V DC feed lines. IC Role / Device Role / Timing Role: Placed between PSE output and PD input to limit common-mode overvoltage during cable coupling events. Use Value: Delivers 25.5 V clamping at 5 A with 0.080 %/°C VBR drift, ensuring consistent protection across outdoor temperature ranges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient 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 voltage (23.2 V @ 5.0 A) | Limited to non-repetitive surge events; not qualified to AEC-Q101 | Select SMAJ18A only for cost-sensitive consumer applications where automotive qualification and 10/1000 μs compliance are unnecessary |
| 1.5SMC18A | Higher-power SMC package (1500 W), same 18 V VBR, but larger footprint (0.315" x 0.220") and higher VC (29.2 V @ 43.3 A) | Used where higher single-pulse energy absorption is required, e.g., industrial motor drive inputs | Choose 1.5SMC18A when surge energy exceeds 400 W capability and PCB space allows SMC mounting |
Compared with SMAJ18A and 1.5SMC18A, the TPSMA18AHE3/5AT uniquely combines AEC-Q101 qualification, 10/1000 μs waveform compliance, and SMA footprint - making it the only option among the three validated for automotive power rail designs requiring both reliability and space constraints.
Availability
TPSMA18AHE3/5AT is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom power feed circuits requiring stable component supply with guaranteed long-term continuity and traceable sourcing.
Supply support for TPSMA18AHE3/5AT 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® (Protection and Regulation) transient suppressor family, engineered specifically for robust voltage clamping in automotive, industrial, and telecom systems exposed to harsh electrical environments.
FAQ
What is the AEC-Q101 qualification status of the TPSMA18AHE3/5AT?
The TPSMA18AHE3/5AT is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HE3", which denotes RoHS-compliant and AEC-Q101 qualified variants. This qualification covers stress tests including HTGB, H3TRB, and temperature cycling, validating suitability for automotive under-hood applications. The TPSMA18AHE3/5AT meets all requirements defined in the AEC-Q101 standard for discrete semiconductors.
Does the TPSMA18AHE3/5AT support lead-free reflow soldering?
Yes, the TPSMA18AHE3/5AT supports lead-free reflow soldering with a maximum peak temperature of 260 °C, meeting J-STD-020 MSL Level 1 requirements. Its matte tin-plated leads are solderable per J-STD-002 and JESD22-B102, and the device undergoes whisker testing per JESD201 Class 2. No moisture preconditioning is required prior to assembly.
What is the maximum clamping voltage of the TPSMA18AHE3/5AT under surge conditions?
The TPSMA18AHE3/5AT has a maximum clamping voltage (VC) of 25.5 V at 5.0 A peak pulse current using the 10/1000 μs waveform. This value is measured per Figure 1 in the datasheet and represents the upper bound of voltage seen by downstream circuitry during standardized transient events, ensuring reliable protection of 15 V-rated components.
How does the temperature coefficient affect the TPSMA18AHE3/5AT's breakdown voltage?
The TPSMA18AHE3/5AT has a typical temperature coefficient of VBR (αT) of +0.080 %/°C. This means VBR increases by approximately 14.4 mV per °C rise above 25 °C. For example, at 125 °C, VBR rises to ~18.8 V - a predictable shift critical for designing margin into overvoltage protection schemes across wide ambient ranges.
Is the TPSMA18AHE3/5AT unidirectional or bidirectional?
The TPSMA18AHE3/5AT is unidirectional, as explicitly stated in the Vishay datasheet under FEATURES and PRIMARY CHARACTERISTICS. It protects against positive-going transients only and must be oriented with the cathode band toward the line being protected. Bidirectional variants (e.g., TPSMA18CA) are separate part numbers and not interchangeable with the TPSMA18AHE3/5AT.
TPSMA18AHE3/5AT 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):
- 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)
TPSMA18AHE3/5AT FAQ
1.How can I place an order for TPSMA18AHE3/5AT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPSMA18AHE3/5AT 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 TPSMA18AHE3/5AT reliable?
The price and inventory of TPSMA18AHE3/5AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPSMA18AHE3/5AT is usually 5 days.
3.What payment methods are accepted for TPSMA18AHE3/5AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPSMA18AHE3/5AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPSMA18AHE3/5AT?
TPSMA18AHE3/5AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPSMA18AHE3/5AT 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 TPSMA18AHE3/5AT?
For technical support, including TPSMA18AHE3/5AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPSMA18AHE3/5AT requirements.
6.How does Aetrix verify that TPSMA18AHE3/5AT is sourced from the original manufacturer or authorized distributors?
All TPSMA18AHE3/5AT 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 TPSMA18AHE3/5AT meets industry standards.
7.What is the process for return or replacement of TPSMA18AHE3/5AT?
All TPSMA18AHE3/5AT units undergo pre-shipment inspection (PSI). If there is an issue with TPSMA18AHE3/5AT, 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 TPSMA18AHE3/5AT part is unused and in its original packaging.
Return procedure for TPSMA18AHE3/5AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TPSMA18AHE3/5AT Tags
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