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Vishay General Semiconductor - Diodes Division TPSMA18AHE3_A/I
- Part No.:
- TPSMA18AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
TPSMA18AHE3_A/I.pdf
- Description:
- TVS DIODE 15.3VWM 25.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,344
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Product details
Overview
TPSMA18AHE3_A/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, rated for 18.0 V breakdown voltage (VBR), 400 W peak pulse power (10/1000 µs), 25.5 V clamping voltage at 15.9 A peak surge current, and 185 °C maximum junction temperature - used to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial power supply rails.
For engineers reviewing the TPSMA18AHE3_A/I datasheet, TPSMA18AHE3_A/I pinout, TPSMA18AHE3_A/I application, or TPSMA18AHE3_A/I equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification status, 1.0 W steady-state power dissipation, low incremental surge resistance, and compatibility with high-reliability PCB layouts requiring MSL Level 1 reflow.
Technical Context
This TVS diode operates as a clamping-type overvoltage protection device, leveraging passivated anisotropic rectifier technology to deliver fast response time (<1 ns) and stable clamping under repetitive transients. Its unidirectional configuration enables integration into DC-biased power rails where reverse conduction must be blocked.
The device is characterized by a temperature coefficient of VBR = +0.080 %/°C and supports operation from −65 °C to +185 °C, enabling use in under-hood automotive environments and industrial control systems exposed to thermal cycling and high ambient temperatures.
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 at which avalanche conduction begins under controlled test conditions |
| VWM | 15.3 V - maximum continuous reverse working voltage before leakage exceeds 1.0 µA, setting safe DC bias limit |
| VC @ IPPM | 25.5 V at 15.9 A - clamped voltage during 400 W transient event, directly limiting stress on downstream components |
| PPPM | 400 W (10/1000 µs waveform) - peak transient energy absorption capability without failure |
| TJ max. | +185 °C - enables reliable operation in high-temperature automotive and industrial enclosures without derating |
| Polarity | Unidirectional - blocks reverse current flow while clamping positive transients, suitable for DC power line protection |
| MSL Level | Level 1 (J-STD-020) - supports standard Pb-free reflow profiles up to 260 °C peak without moisture-induced damage |
Pinout & Package
Package: SMA (DO-214AC), surface-mount plastic case with matte tin-plated leads, cathode indicated by color band. Dimensions per JEDEC DO-214AC standard: 4.93 mm × 3.99 mm × 2.29 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction or clamping | Connected to lower-potential side of protected circuit (e.g., ground or return path) |
| Cathode | Current exit terminal during clamping; marked with band | Connected to higher-potential side (e.g., VIN, signal line) to clamp positive transients to VC |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation optimized design | Enables stable VBR performance and low leakage (<1.0 µA at VWM) across temperature and lifetime |
| AEC-Q101 qualified (HE3 suffix) | Validated for automotive-grade reliability including temperature cycling, humidity, and mechanical shock testing |
| 400 W peak pulse power (10/1000 µs) | Withstands ISO 7637-2 Pulse 1, 2a, 3a/b, and IEC 61000-4-5 surge events in 12 V/24 V systems |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving protection margin for sensitive ICs |
| MSL Level 1, 260 °C peak reflow | Eliminates pre-bake requirement and supports high-throughput SMT assembly without popcorn cracking |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Clamping TVS diode placed between power input and ground, activated within nanoseconds of overvoltage onset. Use Value: Limits voltage to ≤25.5 V during 400 W surges, preventing latch-up or gate oxide damage in MCU and CAN transceivers. | Use Scenario: Shielding analog output lines of pressure/temperature sensors in factory automation PLC modules. IC Role / Device Role / Timing Role: Unidirectional shunt protector on 0–5 V or 4–20 mA signal paths, suppressing ESD and inductive switching noise. Use Value: Maintains signal integrity with <1.0 µA leakage at 15.3 V, avoiding offset errors in precision ADC front-ends. |
| Consumer Power Adapter Input Stage | Telecom DC-DC Converter Input Protection |
Use Scenario: Safeguarding AC/DC adapter primary-side rectifier outputs against lightning-induced surges on mains-connected devices. IC Role / Device Role / Timing Role: Secondary-side TVS on bulk capacitor rail, clamping transients before they reach switching controller ICs. Use Value: Withstands repetitive 10/1000 µs pulses at 0.01% duty cycle, ensuring long-term reliability in wall-wart designs. | Use Scenario: Protecting isolated DC-DC converter inputs in PoE-powered network switches and base stations. IC Role / Device Role / Timing Role: Transient suppressor on 48 V input bus, coordinated with upstream MOVs and fuses per IEC 61000-4-5 Class 3. Use Value: Delivers 25.5 V clamping at 15.9 A, reducing stress on primary-side FETs and enabling smaller input filter capacitors. |
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 (Bourns) | Same SMA package, 18 V VBR, but rated for 400 W with 1.0 µA IR at VWM; not AEC-Q101 qualified | Lacks automotive qualification; suitable for commercial/industrial only | Select when AEC-Q101 is not required and cost sensitivity outweighs qualification needs |
| 1.5SMC18A (ON Semiconductor) | Same electrical specs, but in larger SMC (DO-214AB) package; 1.5 kW rating, higher thermal mass | Requires larger PCB footprint and different pad layout; better for high-energy, low-duty-cycle events | Choose when higher single-pulse robustness is needed and board space permits SMC footprint |
Compared with SMAJ18A and 1.5SMC18A, the TPSMA18AHE3_A/I uniquely combines AEC-Q101 qualification, MSL Level 1 reflow compatibility, and DO-214AC footprint in a single solution - making it optimal for space-constrained automotive modules requiring zero requalification effort.
Availability
TPSMA18AHE3_A/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom power supply designs requiring stable component supply, AEC-Q101 compliance, and high-temperature operational assurance.
Supply support for TPSMA18AHE3_A/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® (Protected Anisotropic Rectifier) transient voltage suppressor product line, engineered specifically for robust, high-temperature-stable clamping in automotive power distribution and industrial control systems.
FAQ
What is the breakdown voltage tolerance for TPSMA18AHE3_A/I?
The TPSMA18AHE3_A/I has a specified breakdown voltage range of 17.1 V (minimum) to 18.9 V (maximum) at 1.0 mA test current, with 18.0 V as the nominal value. This ±5.6% tolerance ensures predictable clamping onset across production lots and temperature extremes, critical for consistent protection in automotive and industrial applications where margin analysis depends on tight VBR bounds. The TPSMA18AHE3_A/I maintains this specification under full AEC-Q101 qualification testing.
Is TPSMA18AHE3_A/I RoHS-compliant and halogen-free?
Yes, the TPSMA18AHE3_A/I is RoHS-compliant and halogen-free. Per Vishay's ordering nomenclature, the "HE3" suffix denotes RoHS-compliance and AEC-Q101 qualification, while the "HM3" suffix adds halogen-free status. Since TPSMA18AHE3_A/I uses the HE3 suffix, it meets RoHS Directive 2011/65/EU but does not carry halogen-free certification - for halogen-free requirements, the TPSMA18AHM3_A/I variant must be selected. Both versions share identical electrical and thermal performance.
What is the maximum clamping voltage of TPSMA18AHE3_A/I at its rated peak pulse current?
The TPSMA18AHE3_A/I exhibits a maximum clamping voltage (VC) of 25.5 V at its rated peak pulse current (IPPM) of 15.9 A, measured using the standardized 10/1000 µs double-exponential waveform. This clamping level directly determines the voltage stress imposed on protected components during surge events - for example, ensuring that a 3.3 V microcontroller powered via a local LDO remains below its absolute maximum rating even during worst-case transients. The TPSMA18AHE3_A/I achieves this with low incremental surge resistance, minimizing overshoot.
Can TPSMA18AHE3_A/I be used in bidirectional configurations?
No, the TPSMA18AHE3_A/I is unidirectional only, as explicitly stated in the Vishay datasheet. It conducts and clamps only for positive transients relative to its cathode terminal and blocks reverse current flow. For bidirectional protection (e.g., AC lines or differential signals), two TPSMA18AHE3_A/I devices must be connected in series opposition, or a dedicated bidirectional TVS such as the TPSMA18CA should be selected. Using TPSMA18AHE3_A/I in reverse-biased mode beyond its 15.3 V stand-off voltage risks permanent degradation.
What is the thermal derating behavior of TPSMA18AHE3_A/I above 25 °C ambient?
The TPSMA18AHE3_A/I follows standard thermal derating per Figure 2 in its datasheet: peak pulse power (PPPM) decreases linearly above 25 °C ambient, reaching ~50% of 400 W at 125 °C and maintaining usable clamping capability up to its 185 °C maximum junction temperature. Steady-state power dissipation (PD = 1.0 W) also derates linearly to zero at 185 °C. These curves are validated under defined PCB mounting conditions (0.2" × 0.2" copper pads), and actual performance in end equipment depends on thermal layout - the TPSMA18AHE3_A/I's high TJ rating enables operation in thermally demanding locations where other TVS diodes would require derating or heatsinking.
TPSMA18AHE3_A/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:
- 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/I FAQ
1.How can I place an order for TPSMA18AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for TPSMA18AHE3_A/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 TPSMA18AHE3_A/I reliable?
The price and inventory of TPSMA18AHE3_A/I 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/I is usually 5 days.
3.What payment methods are accepted for TPSMA18AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPSMA18AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPSMA18AHE3_A/I?
TPSMA18AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPSMA18AHE3_A/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 TPSMA18AHE3_A/I?
For technical support, including TPSMA18AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPSMA18AHE3_A/I requirements.
6.How does Aetrix verify that TPSMA18AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All TPSMA18AHE3_A/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 TPSMA18AHE3_A/I meets industry standards.
7.What is the process for return or replacement of TPSMA18AHE3_A/I?
All TPSMA18AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with TPSMA18AHE3_A/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 TPSMA18AHE3_A/I part is unused and in its original packaging.
Return procedure for TPSMA18AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TPSMA18AHE3_A/I Tags
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