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Vishay General Semiconductor - Diodes Division TPSMA18HE3_A/I
- Part No.:
- TPSMA18HE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
TPSMA18HE3_A/I.pdf
- Description:
- TVS DIODE 14.5VWM 26.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,318
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Product details
Overview
TPSMA18HE3_A/I 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 18.0 V nominal breakdown voltage (VBR), 15.3 V stand-off voltage (VWM), 25.5 V maximum clamping voltage (VC) at 15.9 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 TPSMA18HE3_A/I datasheet, TPSMA18HE3_A/I pinout, TPSMA18HE3_A/I application, or TPSMA18HE3_A/I equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, MSL Level 1 rating, 1.0 W steady-state power dissipation, and compatibility with high-reliability PCB layouts using 5.0 mm × 5.0 mm copper pads per terminal.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to deliver stable clamping under repetitive surge conditions. Its 185 °C maximum junction temperature enables operation in under-hood automotive environments and industrial power supplies where thermal derating is critical.
The device responds in sub-nanosecond time to transients and maintains low incremental surge resistance to minimize voltage overshoot during 400 W 10/1000 µs pulses. It meets JESD201 Class 2 whisker resistance and is RoHS-compliant with matte tin-plated leads solderable per J-STD-002.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 17.1 V / 18.0 V / 18.9 V - ensures reliable triggering above normal operating voltage while avoiding false trips |
| VWM | 15.3 V - maximum continuous reverse voltage before leakage exceeds 1 µA at 25 °C |
| VC @ IPPM | 25.5 V at 15.9 A - clamps induced surges to safe levels for downstream 24 V-rated ICs and MOSFETs |
| PPPM | 400 W (10/1000 µs) - handles common lightning and inductive-switching transients without failure |
| TJ max. | +185 °C - supports placement near heat sources in automotive ECUs and industrial motor drives |
| Polarity | Unidirectional - protects only against positive-going transients on cathode-biased lines |
| Package | SMA (DO-214AC) - industry-standard SMD footprint with 5.28 mm length, compatible with automated assembly |
Pinout & Package
SMA (DO-214AC) package with axial lead configuration: molded plastic body, color band indicating cathode terminal, matte tin-plated leads, UL 94 V-0 rated compound, and recommended 5.0 mm × 5.0 mm copper pad layout per terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient clamp output node | Connected to protected line; conducts during overvoltage to shunt energy to ground |
| Anode | Reference/return path | Typically tied to system ground or lower-potential rail; completes clamping current path |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| MSL Level 1 (260 °C) | Zero moisture sensitivity - no baking required prior to reflow soldering |
| 185 °C junction rating | Enables use in high-temperature zones without thermal derating penalties up to rated power |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes stress on protected components by limiting overshoot during surge events |
| Junction passivation | Reduces parameter drift and leakage increase under long-term high-temperature bias |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-fed microcontroller power inputs in engine control units against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamping transient energy before it reaches LDO regulators and MCU VDD pins. Use Value: Prevents latch-up and permanent damage during ISO 7637-2 Pulse 5a (load dump) events up to 60 V, leveraging 25.5 V clamping and 400 W surge capability. | Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) in factory automation systems from ESD and cable discharge events. IC Role / Device Role / Timing Role: Fast-response voltage clamp on differential or single-ended signal lines interfacing with ADC front-ends. Use Value: Limits voltage excursion to ≤25.5 V during ±8 kV contact ESD (IEC 61000-4-2), preserving signal integrity and preventing ADC saturation or input-stage damage. |
| Telecom DC Power Input Protection | Consumer Device USB Port Protection |
Use Scenario: Safeguarding 48 V PoE-powered network switches and base station radios from lightning-induced surges on DC input rails. IC Role / Device Role / Timing Role: Primary overvoltage suppression stage upstream of DC-DC converters and hot-swap controllers. Use Value: Absorbs 400 W 10/1000 µs transients per IEEE C62.41.2 Category B/C requirements while maintaining <1 µA leakage at 15.3 V. | Use Scenario: Adding robustness to USB Type-A power delivery paths in smart home hubs and docking stations exposed to user-handling ESD. IC Role / Device Role / Timing Role: Secondary-level transient suppressor placed after common-mode chokes and before USB controller VBUS pins. Use Value: Clamps fast-rising ESD pulses to 25.5 V within <1 ns, meeting USB-IF ESD immunity requirements without affecting 5 V regulation accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18A | Same VBR (18 V), but SMB package (DO-214AA); 600 W PPPM; higher IPPM (33.6 A) | Larger footprint; better suited for higher-energy transients where board space allows | Select SMBJ18A when surge energy exceeds 400 W or when thermal margin requires larger copper area |
| SMCJ18A | Same VBR, but SMC package (DO-214AB); 1500 W PPPM; 86.5 A IPPM | Substantially larger case; used in primary-level AC/DC or DC/DC input protection | Choose SMCJ18A for front-end protection where IEC 61000-4-5 Level 4 compliance is required |
Compared with SMBJ18A and SMCJ18A, the TPSMA18HE3_A/I offers optimal balance of compact SMA footprint, AEC-Q101 qualification, and 400 W surge handling - making it preferred for space-constrained automotive and industrial PCBs where MSL Level 1 and +185 °C operation are mandatory.
Availability
TPSMA18HE3_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 reliability.
Supply support for TPSMA18HE3_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 reliability, thermal performance, and automotive qualification.
The TPSMA18HE3_A/I belongs to Vishay's PAR® series of surface-mount TVS diodes, engineered specifically for high-temperature stability and repeatable clamping in harsh-environment applications such as automotive power systems and industrial controls.
FAQ
What is the breakdown voltage tolerance for TPSMA18HE3_A/I?
The TPSMA18HE3_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% tolerance ensures consistent clamping behavior across production lots while allowing margin for thermal drift - critical for designs operating near the upper limit of the 15.3 V stand-off voltage.
Is TPSMA18HE3_A/I suitable for bidirectional transient protection?
No, the TPSMA18HE3_A/I is unidirectional only, as confirmed in the Vishay datasheet. It protects against positive-going transients on cathode-biased lines and must not be used where negative voltage excursions require suppression. For bidirectional protection, consider dual-diode configurations or dedicated bidirectional TVS devices like the SMAJ18CA.
Does TPSMA18HE3_A/I meet automotive qualification standards?
Yes, TPSMA18HE3_A/I is AEC-Q101 qualified, as explicitly stated in the Vishay documentation. The HE3 suffix denotes RoHS-compliant and AEC-Q101 qualified construction, validated for temperature cycling, high-temperature reverse bias, and mechanical shock - making it suitable for under-hood and chassis-mounted automotive modules.
What is the maximum clamping voltage of TPSMA18HE3_A/I under surge conditions?
The TPSMA18HE3_A/I exhibits a maximum clamping voltage (VC) of 25.5 V at its rated peak pulse current of 15.9 A (10/1000 µs waveform). This value is measured under standardized test conditions with 5.0 mm × 5.0 mm copper pads and defines the upper voltage limit imposed on protected circuitry during transient events.
Can TPSMA18HE3_A/I be used in reflow soldering processes without preconditioning?
Yes, TPSMA18HE3_A/I is rated MSL Level 1 per J-STD-020, with a maximum peak reflow temperature of 260 °C. No moisture sensitivity precautions - such as dry packing or baking - are required before standard lead-free reflow profiles, simplifying manufacturing and reducing process risk.
TPSMA18HE3_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):
- 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_A/I FAQ
1.How can I place an order for TPSMA18HE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for TPSMA18HE3_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 TPSMA18HE3_A/I reliable?
The price and inventory of TPSMA18HE3_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 TPSMA18HE3_A/I is usually 5 days.
3.What payment methods are accepted for TPSMA18HE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPSMA18HE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPSMA18HE3_A/I?
TPSMA18HE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPSMA18HE3_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 TPSMA18HE3_A/I?
For technical support, including TPSMA18HE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPSMA18HE3_A/I requirements.
6.How does Aetrix verify that TPSMA18HE3_A/I is sourced from the original manufacturer or authorized distributors?
All TPSMA18HE3_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 TPSMA18HE3_A/I meets industry standards.
7.What is the process for return or replacement of TPSMA18HE3_A/I?
All TPSMA18HE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with TPSMA18HE3_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 TPSMA18HE3_A/I part is unused and in its original packaging.
Return procedure for TPSMA18HE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TPSMA18HE3_A/I Tags
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