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Vishay General Semiconductor - Diodes Division TPSMA18AHM3_B/H
- Part No.:
- TPSMA18AHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
TPSMA18AHM3_B/H.pdf
- Description:
- TVS DIODE 15.3VWM 25.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,593
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Product details
Overview
TPSMA18AHM3_B/H from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) diode designed for clamping inductive switching and lightning-induced transients on power and signal lines. It features 18.0 V nominal breakdown voltage (VBR), 15.3 V stand-off voltage (VWM), 400 W peak pulse power (10/1000 µs), 15.9 V maximum clamping voltage at 5.0 A, and operates up to +185 °C junction temperature - used in automotive sensor protection and industrial I/O interface circuits.
For engineers reviewing the TPSMA18AHM3_B/H datasheet, TPSMA18AHM3_B/H pinout, TPSMA18AHM3_B/H application, or TPSMA18AHM3_B/H equivalent, key selection criteria include unidirectional polarity, SMA (DO-214AC) package compatibility, AEC-Q101 qualification status, TJ = 185 °C rating, and clamping performance under 10/1000 µs surge conditions.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology with optimized junction passivation for stable high-temperature operation. Its unidirectional architecture provides low incremental surge resistance and fast response time to suppress transients before downstream ICs or MOSFETs are damaged.
The device is rated for 400 W peak pulse power per 10/1000 µs waveform at TA = 25 °C, derated linearly above that ambient, and supports repetitive surge duty cycles up to 0.01 %. It meets MSL Level 1 per J-STD-020 with 260 °C reflow peak and passes JESD201 Class 2 whisker testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 17.1 V / 18.0 V / 18.9 V - ensures reliable turn-on above system operating voltage while avoiding false triggering |
| VWM | 15.3 V - maximum continuous reverse voltage the device blocks without leakage exceeding 1.0 µA |
| VC @ IPPM | 25.5 V at 5.0 A - clamping voltage during full-rated 400 W transient, limiting stress on protected circuitry |
| PPPM | 400 W (10/1000 µs) - surge energy handling capacity suitable for automotive load-dump and inductive kick events |
| TJ max. | +185 °C - enables use in under-hood automotive and high-ambient industrial environments without derating |
| Polarity | Unidirectional - protects against positive-going transients only; requires correct cathode orientation in PCB layout |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, matte tin-plated terminals. Cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to lower-potential side of protected line; forms current path during clamping |
| Cathode | Current exit point during forward conduction; marked with band | Connected to higher-potential side (e.g., VCC or signal rail); defines unidirectional clamping direction |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation optimized design | Enables stable leakage and VBR performance across -65 °C to +185 °C operating range |
| 400 W peak pulse power (10/1000 µs) | Withstands automotive ISO 7637-2 Pulse 1, 2a, 3a/b and IEC 61000-4-5 surge events |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free SMT assembly without moisture sensitivity concerns |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive applications requiring zero defects and long-term field reliability |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (<1 ns rise time capability) |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ESD in engine control modules. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between signal line and ground or supply rail to limit transient overvoltage. Use Value: Clamps 15.3 V nominal system rails to ≤25.5 V during 400 W surges, preserving signal integrity and preventing latch-up in connected ASICs. | Use Scenario: Safeguarding digital input channels on programmable logic controllers exposed to relay coil flyback and motor drive noise. IC Role / Device Role / Timing Role: Standoff-blocking TVS on 24 V DC input lines, triggered only during >17.1 V transients. Use Value: Maintains <1.0 µA leakage at 15.3 V while responding in <1 ns to suppress 1 kV/µs edges, ensuring no false triggering during normal operation. |
| Power Supply Rail Clamping | Telecom Line Interface Protection |
Use Scenario: Secondary overvoltage protection on 15 V auxiliary power rails feeding microcontrollers and communication ICs in base stations. IC Role / Device Role / Timing Role: Parallel-connected TVS providing last-line defense after primary filtering and upstream TVS stages. Use Value: Delivers 25.5 V clamping at 5.0 A with 0.080 %/°C VBR tempco, enabling predictable coordination with upstream protection devices. | Use Scenario: Transient suppression on RS-485/RS-232 data lines in telecom infrastructure equipment subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to local ground, protecting driver/receiver ICs from common-mode transients. Use Value: Withstands 400 W pulses while maintaining <1.0 µA leakage at 15.3 V, minimizing impact on signal integrity and bias networks. |
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 | Same SMA package, 18 V VBR, but rated for 400 W with 10/1000 µs waveform and not AEC-Q101 qualified | Lacks automotive qualification; suitable for industrial/commercial designs where AEC-Q101 is not mandated | Select SMAJ18A when cost sensitivity outweighs automotive reliability requirements |
| TPSMA18AHM3_T/R | Identical electrical specs and AEC-Q101 qualification; differs only in tape-and-reel packaging (7500 pcs vs. 1800 pcs) | No functional difference; same PCB layout and thermal behavior | Choose TPSMA18AHM3_T/R for high-volume production requiring larger reel quantities |
Compared with SMAJ18A and TPSMA18AHM3_T/R, the TPSMA18AHM3_B/H offers identical clamping performance and AEC-Q101 qualification in a smaller 1800-piece reel format - ideal for prototyping, low-volume automotive builds, and JIT inventory management without sacrificing reliability or thermal margin.
Availability
TPSMA18AHM3_B/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom line protection requiring stable component supply, AEC-Q101 compliance, and high-temperature operational assurance.
Supply support for TPSMA18AHM3_B/H 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 TPSMAxxA family is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where failure due to voltage surges must be eliminated.
FAQ
What is the breakdown voltage tolerance for TPSMA18AHM3_B/H?
The TPSMA18AHM3_B/H has a specified breakdown voltage (VBR) range of 17.1 V (min) to 18.9 V (max) at 1.0 mA test current, with 18.0 V nominal. This ±5.6 % tolerance ensures consistent clamping behavior across production lots while accommodating process variation and temperature drift.
Is TPSMA18AHM3_B/H compatible with lead-free reflow soldering processes?
Yes, TPSMA18AHM3_B/H meets MSL Level 1 per J-STD-020 and supports peak reflow temperatures up to 260 °C, making it fully compatible with standard lead-free soldering profiles. Its matte tin-plated terminals comply with J-STD-002 and JESD 22-B102 for reliable wetting and intermetallic formation.
Does TPSMA18AHM3_B/H support bidirectional transient suppression?
No, TPSMA18AHM3_B/H is unidirectional only, as confirmed in the Vishay datasheet. It clamps positive transients relative to its cathode terminal and blocks reverse voltage up to 15.3 V. For bidirectional protection, a separate device such as P6SMB18CA or dual-diode configuration is required.
What is the maximum clamping voltage of TPSMA18AHM3_B/H at rated surge current?
The TPSMA18AHM3_B/H exhibits a maximum clamping voltage (VC) of 25.5 V at 5.0 A peak pulse current (IPPM), measured using the standardized 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuitry during worst-case surge events.
How does the temperature coefficient affect VBR in TPSMA18AHM3_B/H?
The TPSMA18AHM3_B/H has a typical VBR temperature coefficient (αT) of +0.080 %/°C. This means VBR increases by approximately 0.0144 V per °C rise above 25 °C - critical for designing coordinated protection schemes where multiple TVS devices operate across wide temperature ranges.
TPSMA18AHM3_B/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- PAR®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 185°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
TPSMA18AHM3_B/H FAQ
1.How can I place an order for TPSMA18AHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for TPSMA18AHM3_B/H 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 TPSMA18AHM3_B/H reliable?
The price and inventory of TPSMA18AHM3_B/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPSMA18AHM3_B/H is usually 5 days.
3.What payment methods are accepted for TPSMA18AHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPSMA18AHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPSMA18AHM3_B/H?
TPSMA18AHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPSMA18AHM3_B/H 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 TPSMA18AHM3_B/H?
For technical support, including TPSMA18AHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPSMA18AHM3_B/H requirements.
6.How does Aetrix verify that TPSMA18AHM3_B/H is sourced from the original manufacturer or authorized distributors?
All TPSMA18AHM3_B/H 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 TPSMA18AHM3_B/H meets industry standards.
7.What is the process for return or replacement of TPSMA18AHM3_B/H?
All TPSMA18AHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with TPSMA18AHM3_B/H, 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 TPSMA18AHM3_B/H part is unused and in its original packaging.
Return procedure for TPSMA18AHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TPSMA18AHM3_B/H Tags
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