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Vishay General Semiconductor - Diodes Division TPSMA20HE3/5AT
- Part No.:
- TPSMA20HE3/5AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
TPSMA20HE3/5AT.pdf
- Description:
- TVS DIODE 16.2VWM 29.1VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,879
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Product details
Overview
TPSMA20HE3/5AT 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 20 V breakdown voltage (VBR = 19.0–21.0 V at 1.0 mA), 17.1 V stand-off voltage (VWM), 27.7 V maximum clamping voltage (VC) at 14.4 A peak pulse current, 400 W peak pulse power (10/1000 µs), and operates up to +185 °C junction temperature - used in automotive sensor protection and industrial power supply input stages.
For engineers reviewing the TPSMA20HE3/5AT datasheet, TPSMA20HE3/5AT pinout, TPSMA20HE3/5AT application, or TPSMA20HE3/5AT equivalent, key selection criteria include unidirectional polarity, 17.1 V working voltage compatibility with 24 V systems, AEC-Q101 qualification status, thermal derating above 25 °C, and PCB pad layout requirements per JESD22-B102 solderability standards.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology optimized for high-temperature stability and low incremental surge resistance. Its clamping behavior is defined by a 10/1000 µs waveform with 0.01 % duty cycle, and it delivers stable performance across -65 °C to +185 °C operating junction temperature range.
The device exhibits fast response time (<1 ns), excellent clamping ratio (VC/VBR ≈ 1.39), and meets MSL Level 1 per J-STD-020 with 260 °C peak reflow profile. Its unidirectional configuration enables use in DC-biased circuits where reverse conduction must be blocked until clamping threshold is exceeded.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 19.0 / 20.0 / 21.0 V at 1.0 mA - defines precise voltage threshold at which avalanche conduction begins under controlled test conditions |
| VWM | 17.1 V - maximum continuous reverse voltage before leakage exceeds 1.0 µA, compatible with 24 V nominal systems |
| VC @ IPPM | 27.7 V at 14.4 A - clamped voltage during 400 W transient, limiting downstream IC stress to safe levels |
| PPPM | 400 W (10/1000 µs) - peak pulse power handling capacity for lightning and inductive switching surges |
| TJ max. | +185 °C - enables operation in under-hood automotive environments and high-power industrial enclosures |
| Polarity | Unidirectional - blocks reverse current until breakdown, suitable for DC power rail protection |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with 0.208" x 0.157" footprint and cathode band marking |
Pinout & Package
SMA (DO-214AC) package with molded epoxy body, matte tin-plated leads, and cathode identification via color band. Mounting requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal per datasheet fig. 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode of internal PN junction | Connected to protected line; conducts when transient exceeds VBR, shunting surge to ground |
| Anode | Cathode of internal PN junction | Typically tied to system ground or low-impedance return path to complete clamping loop |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JEDEC standard |
| Junction passivation | Reduces surface leakage and improves long-term stability under high humidity and bias stress |
| MSL Level 1 rating | Allows unlimited floor life and supports lead-free reflow up to 260 °C peak without preconditioning |
| Low clamping ratio | VC/VBR = 1.39 ensures minimal overvoltage exposure to protected ICs during surge events |
| High IFSM | 40 A non-repetitive forward surge rating supports robustness against repeated inductive turn-off spikes |
Applications
| Automotive Sensor Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor interfaces (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Voltage clamping element placed between signal line and chassis ground, activated within <1 ns of overvoltage event. Use Value: Limits transient voltage to ≤27.7 V, preventing damage to 3.3 V or 5 V interface ICs while maintaining signal integrity during normal operation. |
Use Scenario: Safeguarding digital input modules in programmable logic controllers exposed to relay coil flyback and motor drive noise. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 24 V DC input terminals, coordinated with upstream fuse and series impedance. Use Value: Withstands 400 W surges per IEC 61000-4-5 combination wave, enabling compliance with industrial immunity standards without additional filtering. |
| DC Power Supply Input | Telecom Line Interface |
Use Scenario: Input-stage transient suppression for 24 V switch-mode power supplies in factory automation equipment. IC Role / Device Role / Timing Role: First-line defense against inductive switching transients from contactors and solenoids sharing common bus. Use Value: 17.1 V VWM allows full utilization of 24 V nominal margin while clamping to 27.7 V - minimizing dropout risk during brownout conditions. |
Use Scenario: Secondary-level surge protection on low-voltage telecom signal lines (e.g., RS-485, Ethernet PHY bias rails). IC Role / Device Role / Timing Role: Standby clamping device in parallel with data line, activated only during fault conditions to avoid signal distortion. Use Value: 1.0 µA max reverse leakage at VWM ensures negligible impact on line termination and signal rise/fall times. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20A | Same VBR range (19.0–21.0 V), identical SMA package, but not AEC-Q101 qualified; 350 W PPPM | Lacks automotive qualification; suitable for commercial/industrial use only | Select SMAJ20A if AEC-Q101 is not required and cost sensitivity outweighs 12.5 % lower pulse power margin |
| TPSMA20AHM3/5AT | Identical electrical specs and AEC-Q101 qualification; halogen-free molding compound vs. RoHS-compliant HE3 version | Required for halogen-free BOM compliance in EU/Asia markets | Choose TPSMA20AHM3/5AT when material compliance mandates halogen-free construction per IEC 61249-2-21 |
Compared with SMAJ20A and TPSMA20AHM3/5AT, the TPSMA20HE3/5AT provides certified automotive reliability and full 400 W surge capability in a RoHS-compliant, non-halogen-free form - making it optimal for Tier 1 automotive subsystems where qualification traceability and peak power margin are critical.
Availability
TPSMA20HE3/5AT is available at Aetrix Electronics and suitable for automotive sensor protection, industrial PLC input stages, and 24 V DC power supply inputs requiring stable component supply, consistent AEC-Q101 qualification, and verified 400 W transient handling.
Supply support for TPSMA20HE3/5AT 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, MOSFETs, and protection devices with emphasis on high-reliability, high-temperature, and automotive-grade performance.
The TPSMAxxA family is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where sustained operation at +185 °C and AEC-Q101 validation are mandatory.
FAQ
What is the maximum clamping voltage of the TPSMA20HE3/5AT under standard test conditions?
The TPSMA20HE3/5AT has a maximum clamping voltage (VC) of 27.7 V when subjected to its rated peak pulse current of 14.4 A using a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and reflects worst-case voltage seen by downstream circuitry during surge events. The TPSMA20HE3/5AT maintains this clamping performance across its full operating temperature range.
Is the TPSMA20HE3/5AT qualified for automotive applications?
Yes, the TPSMA20HE3/5AT is AEC-Q101 qualified, as confirmed by Vishay's documentation (Document Number 88405, Revision 23-Jan-2024). This qualification covers stress tests including high-temperature reverse bias, temperature cycling, and mechanical shock - validating suitability for under-hood and chassis-mounted automotive electronics. The TPSMA20HE3/5AT carries the HE3 suffix denoting RoHS-compliant and AEC-Q101 qualified construction.
What is the stand-off voltage (VWM) of the TPSMA20HE3/5AT, and how does it relate to 24 V systems?
The TPSMA20HE3/5AT has a stand-off voltage (VWM) of 17.1 V, meaning it remains non-conductive with ≤1.0 µA leakage up to that voltage. In 24 V nominal systems, this provides ~29 % headroom above typical regulated 13.5–16.5 V operating ranges, allowing tolerance for ripple and transients while avoiding false triggering. The TPSMA20HE3/5AT is commonly deployed on 24 V supply rails where VWM must exceed maximum steady-state voltage but remain below VBR.
Does the TPSMA20HE3/5AT have a bidirectional configuration option?
No, the TPSMA20HE3/5AT is unidirectional only, as explicitly stated in the Vishay datasheet. It conducts only when the cathode is positive relative to the anode beyond VBR. For AC or bipolar signal line protection, a separate bidirectional variant (e.g., TPSMA20CA) would be required - the TPSMA20HE3/5AT is not interchangeable with bidirectional types due to fundamental junction architecture differences.
What is the thermal derating behavior of the TPSMA20HE3/5AT above 25 °C ambient?
The TPSMA20HE3/5AT follows linear derating of peak pulse power above 25 °C ambient, per Figure 2 in the Vishay datasheet (88405). At 100 °C, its 400 W PPPM rating reduces to approximately 240 W; at 150 °C, it drops to ~120 W. This derating ensures safe operation within its +185 °C maximum junction temperature limit. Designers must apply this curve when sizing PCB copper area and estimating thermal resistance for the TPSMA20HE3/5AT in high-temperature enclosures.
TPSMA20HE3/5AT 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):
- 16.2V
- Voltage - Breakdown (Min):
- 18V
- Voltage - Clamping (Max) @ Ipp:
- 29.1V
- Current - Peak Pulse (10/1000µs):
- 13.7A
- 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)
TPSMA20HE3/5AT FAQ
1.How can I place an order for TPSMA20HE3/5AT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPSMA20HE3/5AT 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 TPSMA20HE3/5AT reliable?
The price and inventory of TPSMA20HE3/5AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPSMA20HE3/5AT is usually 5 days.
3.What payment methods are accepted for TPSMA20HE3/5AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPSMA20HE3/5AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPSMA20HE3/5AT?
TPSMA20HE3/5AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPSMA20HE3/5AT 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 TPSMA20HE3/5AT?
For technical support, including TPSMA20HE3/5AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPSMA20HE3/5AT requirements.
6.How does Aetrix verify that TPSMA20HE3/5AT is sourced from the original manufacturer or authorized distributors?
All TPSMA20HE3/5AT 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 TPSMA20HE3/5AT meets industry standards.
7.What is the process for return or replacement of TPSMA20HE3/5AT?
All TPSMA20HE3/5AT units undergo pre-shipment inspection (PSI). If there is an issue with TPSMA20HE3/5AT, 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 TPSMA20HE3/5AT part is unused and in its original packaging.
Return procedure for TPSMA20HE3/5AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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