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Vishay General Semiconductor - Diodes Division TPSMP18HM3/85A
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- Part No.:
- TPSMP18HM3/85A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-220AA
- Datasheet:
-
TPSMP18HM3/85A.pdf
- Description:
- TVS DIODE 14.5VWM 26.5VC DO220AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,677
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Product details
Overview
TPSMP18HM3/85A from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in DO-220AA (SMP) package, designed for high-reliability overvoltage protection of sensitive electronics. It features a 16.2 V to 19.8 V breakdown voltage (VBR), 26.5 V clamping voltage (VC) at 15.1 A peak pulse current (IPPM), and 400 W peak pulse power (PPPM) - optimized for automotive and industrial signal-line protection.
For engineers reviewing the TPSMP18HM3/85A datasheet, TPSMP18HM3/85A pinout, TPSMP18HM3/85A application, or TPSMP18HM3/85A equivalent, this device delivers AEC-Q101 qualification, 185 °C junction temperature capability, low-profile 1.0 mm height, MSL Level 1 moisture sensitivity, and halogen-free RoHS-compliant construction - critical for automotive ECU, sensor interface, and power rail surge protection design.
Technical Context
This TVS diode employs passivated anisotropic rectifier technology to achieve fast response time (<1 ns), low incremental surge resistance, and excellent clamping performance under 10/1000 μs transients. Its unidirectional polarity and cathode band marking ensure correct PCB orientation during automated placement.
Rated for operation from -65 °C to +185 °C, the TPSMP18HM3/85A maintains stable VBR with a temperature coefficient of 0.088 %/°C and exhibits only 1.0 μA maximum reverse leakage at 14.5 V stand-off voltage (VWM) - enabling robust protection in high-temperature engine bay and industrial control environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage VBR | 16.2 V min / 19.8 V max at 1.0 mA - defines precise turn-on threshold for overvoltage triggering |
| Clamping Voltage VC | 26.5 V at 15.1 A IPPM - limits downstream voltage stress during 10/1000 μs surge events |
| Peak Pulse Power PPPM | 400 W - sustains high-energy transients without failure when mounted on 5 mm × 5 mm copper pads |
| Stand-off Voltage VWM | 14.5 V - ensures no conduction during normal 12 V automotive system operation |
| Maximum Reverse Leakage IR | 1.0 μA at VWM - minimizes standby power loss and avoids false triggering |
| Junction Temperature Range | -65 °C to +185 °C - supports under-hood automotive and industrial ambient conditions |
| AEC-Q101 Qualified | Yes - validated for automotive-grade reliability per stress test requirements |
Pinout & Package
Package: DO-220AA (SMP), surface-mount, single-ended unidirectional configuration. Cathode identified by color band. Matte tin-plated terminals, solderable per J-STD-002 and JESD 22-B102, whisker-tested per JESD 201 Class 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/protected line connection | Connected to signal or power line requiring transient suppression; carries forward current during clamping |
| Cathode | Ground reference / return path | Connected to system ground or low-impedance return; defines unidirectional conduction direction |
Key Features
| Feature | Design Value |
|---|---|
| Passivated anisotropic rectifier technology | Enables stable VBR and low leakage across temperature, eliminating need for external passivation layers |
| 185 °C junction rating | Supports direct placement near heat sources (e.g., power MOSFETs, motor drivers) without derating |
| 1.0 mm typical height | Reduces board profile for space-constrained modules like ADAS sensors and compact ECUs |
| MSL Level 1 (260 °C peak) | Allows standard lead-free reflow without pre-baking, simplifying SMT manufacturing flow |
| Halogen-free, RoHS-compliant, AEC-Q101 qualified | Meets automotive supply chain compliance mandates and environmental regulations without trade-offs in performance |
Applications
| Automotive Sensor Interface | Industrial PLC Input Protection |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus lines and analog sensor outputs (e.g., pressure, temperature) in engine control units against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS placed between signal line and chassis ground to clamp transients before they reach MCU GPIO or analog front-end. Use Value: Clamps 400 W surges at 26.5 V while maintaining <1.0 μA leakage at 14.5 V - preserving signal integrity and preventing false triggers in 12 V systems. |
Use Scenario: Safeguarding digital input channels of programmable logic controllers exposed to inductive switching noise from solenoids and contactors. IC Role / Device Role / Timing Role: Front-end transient suppressor on 24 V DC input lines, absorbing repetitive 10/1000 μs spikes up to 15.1 A. Use Value: Withstands 185 °C junction temperature and AEC-Q101 qualification, ensuring long-term reliability in factory-floor environments with elevated ambient temperatures. |
| Consumer Power Adapter Output | Motor Drive Gate Driver Protection |
|
Use Scenario: Secondary-side overvoltage protection on 5–12 V USB-C PD and AC/DC adapter outputs against output short-circuit recovery spikes. IC Role / Device Role / Timing Role: Unidirectional clamp between regulated output and ground, activated only during positive overvoltage events. Use Value: 26.5 V clamping voltage limits stress on downstream USB-PD controllers and load switches, while 1.0 mm height enables layout in tight output filter sections. |
Use Scenario: Protecting high-side and low-side gate driver ICs from Miller-induced voltage spikes during fast IGBT/MOSFET switching in BLDC inverters. IC Role / Device Role / Timing Role: Localized TVS on gate drive traces to suppress dV/dt-induced ringing before it couples into driver inputs. Use Value: Sub-1 ns response time and low incremental surge resistance minimize voltage overshoot on gate nodes, reducing risk of spurious turn-on and shoot-through. |
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-E3/5AT | DO-214AC (SMA) package; 18 V nominal VBR; 400 W PPPM; 27.7 V VC at 14.4 A | Larger footprint (2.54 mm × 4.57 mm vs. 2.67 mm × 1.15 mm); higher VC increases protected circuit stress | Select when existing SMA footprint is fixed and 0.5 mm height tolerance allows |
| TPSMA6.8A-Q | DO-214AC package; lower VBR (6.45–7.14 V); same AEC-Q101 qualification; 23.8 V VC at 500 A | Designed for 5 V logic rails; unsuitable for 12 V automotive systems due to premature conduction at VWM = 6.4 V | Use only for sub-8 V signal lines; not interchangeable with TPSMP18HM3/85A in 12 V applications |
Compared with SMAJ18A-E3/5AT and TPSMA6.8A-Q, the TPSMP18HM3/85A offers superior board-space efficiency via its ultra-low-profile DO-220AA package, tighter VBR tolerance (±10 % vs. ±15 %), and optimized clamping for 12 V systems - making it the preferred choice where thermal density, layout area, and automotive compliance are jointly constrained.
Availability
TPSMP18HM3/85A is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and consumer power adapter production requiring stable component supply and full AEC-Q101 traceability.
Supply support for TPSMP18HM3/85A 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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for automotive, industrial, and computing markets.
The TPSMP series belongs to Vishay's eSMP® family of high-power-density TVS diodes, engineered specifically for space-constrained, high-temperature automotive and industrial surge protection - emphasizing low profile, AEC-Q101 compliance, and repeatable clamping performance.
FAQ
What is the breakdown voltage range of the TPSMP18HM3/85A?
The TPSMP18HM3/85A has a guaranteed breakdown voltage (VBR) range of 16.2 V to 19.8 V at 1.0 mA test current, as specified in the Vishay datasheet revision 22-Jul-16. This range ensures reliable turn-on behavior across production lots and temperature extremes, and directly supports 12 V automotive system protection where VWM is set to 14.5 V to avoid conduction during normal operation. The TPSMP18HM3/85A maintains this specification under AEC-Q101 stress conditions.
Is the TPSMP18HM3/85A suitable for automotive applications?
Yes, the TPSMP18HM3/85A is AEC-Q101 qualified and rated for junction temperatures up to +185 °C, making it fully suitable for under-hood and transmission-control module applications. Its halogen-free, RoHS-compliant construction and MSL Level 1 rating meet automotive manufacturing requirements. The TPSMP18HM3/85A is explicitly listed in Vishay's automotive-grade product documentation and used in production ECUs for CAN bus and sensor line protection.
What is the clamping voltage of the TPSMP18HM3/85A at its rated peak pulse current?
The TPSMP18HM3/85A clamps to a maximum of 26.5 V at 15.1 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured with the device mounted on a PCB using 5.0 mm × 5.0 mm copper pads per terminal, per JEDEC test conditions. The clamping voltage ensures downstream 12 V-rated ICs remain within safe operating limits during ISO 7637-2 pulse 5a events. The TPSMP18HM3/85A achieves this with low incremental surge resistance inherent to its passivated anisotropic structure.
Does the TPSMP18HM3/85A have polarity marking, and how is it oriented on the PCB?
Yes, the TPSMP18HM3/85A uses a cathode band marking on the DO-220AA (SMP) package body to indicate the cathode terminal. During PCB layout, the banded end must be connected to ground or the lower-potential reference node, as the device is unidirectional and conducts only when anode voltage exceeds cathode voltage by ≥VBR. This marking is visible under standard optical inspection and compatible with automated optical recognition (AOI) systems used in SMT lines handling the TPSMP18HM3/85A.
What is the maximum steady-state power dissipation for the TPSMP18HM3/85A?
The TPSMP18HM3/85A has a maximum steady-state power dissipation (PD) of 2.5 W at an ambient temperature of 75 °C on an infinite heatsink. In real-world PCB layouts, derating applies - for example, at 100 °C ambient, PD drops to approximately 1.5 W. This rating governs continuous leakage-based heating and is distinct from its 400 W peak pulse capability. The TPSMP18HM3/85A's 185 °C TJmax allows operation well beyond typical industrial ambient limits without exceeding junction limits.
TPSMP18HM3/85A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-220AA
- Series:
- PAR®, eSMP®
- 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-220AA (SMP)
TPSMP18HM3/85A FAQ
1.How can I place an order for TPSMP18HM3/85A through Aetrix?
Please submit a Request for Quotation (RFQ) for TPSMP18HM3/85A 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 TPSMP18HM3/85A reliable?
The price and inventory of TPSMP18HM3/85A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPSMP18HM3/85A is usually 5 days.
3.What payment methods are accepted for TPSMP18HM3/85A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPSMP18HM3/85A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPSMP18HM3/85A?
TPSMP18HM3/85A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPSMP18HM3/85A 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 TPSMP18HM3/85A?
For technical support, including TPSMP18HM3/85A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPSMP18HM3/85A requirements.
6.How does Aetrix verify that TPSMP18HM3/85A is sourced from the original manufacturer or authorized distributors?
All TPSMP18HM3/85A 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 TPSMP18HM3/85A meets industry standards.
7.What is the process for return or replacement of TPSMP18HM3/85A?
All TPSMP18HM3/85A units undergo pre-shipment inspection (PSI). If there is an issue with TPSMP18HM3/85A, 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 TPSMP18HM3/85A part is unused and in its original packaging.
Return procedure for TPSMP18HM3/85A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TPSMP18HM3/85A Tags
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