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Vishay General Semiconductor - Diodes Division TPSMA18AHM3_B/I
- Part No.:
- TPSMA18AHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
TPSMA18AHM3_B/I.pdf
- Description:
- TVS DIODE 15.3VWM 25.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,836
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Product details
Overview
TPSMA18AHM3_B/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for clamping inductive switching transients and lightning-induced surges on power rails and signal lines. It features a 18.0 V nominal breakdown voltage (VBR), 400 W peak pulse power (10/1000 µs), 25.5 V maximum clamping voltage at 15.9 A, 1.0 W steady-state power dissipation, and operates up to +185 °C junction temperature - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the TPSMA18AHM3_B/I datasheet, TPSMA18AHM3_B/I pinout, TPSMA18AHM3_B/I application, or TPSMA18AHM3_B/I equivalent, key selection criteria include unidirectional polarity, SMA (DO-214AC) package compatibility, AEC-Q101 qualification status, TJ = 185 °C capability, and clamping performance under 10/1000 µs surge conditions.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to deliver stable clamping with low incremental surge resistance and excellent response time. Its unidirectional architecture enables forward-biased operation during overvoltage events while maintaining low leakage (<1.0 µA at 15.3 V) and high thermal stability across -65 °C to +185 °C.
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 (Nominal) | 18.0 V - ensures reliable triggering just above normal 12 V rail operating range |
| VWM | 15.3 V - maximum continuous reverse standoff voltage before leakage exceeds 1.0 µA |
| VC @ IPPM | 25.5 V - clamping voltage at 15.9 A peak pulse current, limiting downstream stress |
| PPPM | 400 W - surge energy handling per 10/1000 µs waveform, validated on 5.0 mm × 5.0 mm copper pads |
| TJ max. | +185 °C - enables use in under-hood automotive and high-temp industrial environments |
| Polarity | Unidirectional - protects against positive-going transients only; cathode marked by band |
| AEC-Q101 | Qualified - certified for automotive-grade reliability per stress test requirements |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, matte tin-plated terminals solderable per J-STD-002 and JESD22-B102. Cathode identified by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry during clamping event | Connected to protected line (e.g., 12 V rail or signal trace); conducts when voltage exceeds VBR |
| Cathode | Current exit during clamping event | Connected to ground or lower-potential reference; marked by visible band on case |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier design reduces parameter drift and improves long-term leakage stability |
| High-temperature operation | TJ = 185 °C rating supports placement near heat sources without derating penalties |
| Low clamping ratio | VC/VBR ≈ 1.42 enables tighter system-level overvoltage margin control |
| Fast response time | Sub-nanosecond turn-on ensures protection before sensitive ICs experience overstress |
| MSL Level 1 | Compatible with standard SMT reflow profiles up to 260 °C peak, no dry-pack required |
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 ISO 7637-2 pulses in engine control units. IC Role / Device Role / Timing Role: Unidirectional TVS clamping element placed between signal line and chassis ground. Use Value: Limits transient voltage to ≤25.5 V during 15.9 A surge, preserving signal integrity and preventing latch-up in 3.3 V/5 V interface ICs. | Use Scenario: Safeguarding digital input modules in programmable logic controllers exposed to relay coil flyback and ESD in factory automation cabinets. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 24 V DC input channels, upstream of optocoupler or Schmitt trigger input stage. Use Value: Withstands 400 W surges without degradation, enabling >100,000 surge cycles per IEC 61000-4-5 compliance testing. |
| Consumer Power Adapter Input | Telecom Line Card Surge Suppression |
Use Scenario: Secondary-side transient suppression on 12 V output rails of AC/DC adapters used in smart home hubs and set-top boxes. IC Role / Device Role / Timing Role: Standoff protector parallel to DC output, triggered only during abnormal line transients. Use Value: 1.0 µA max leakage at 15.3 V prevents standby power loss; 185 °C rating accommodates enclosed thermal environments. | Use Scenario: Front-end surge protection on Ethernet PHY power supplies and auxiliary bias rails in telecom access equipment. IC Role / Device Role / Timing Role: Fast-clamping element on +3.3 V or +5 V bias lines feeding PHY ICs and clock buffers. Use Value: 25.5 V clamping ensures safe operation below absolute maximum ratings of 3.3 V ICs with 0.3 V tolerance margins. |
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 1.0 W PD; not AEC-Q101 qualified | Lacks automotive qualification; suitable for commercial/industrial use only | Select when AEC-Q101 is not required and cost sensitivity outweighs qualification needs |
| TPSMA18AHE3_B/I | Identical electrical specs and package; differs only in halogen content (HE3 = RoHS + AEC-Q101, HM3 = halogen-free + RoHS + AEC-Q101) | No functional difference; HM3 variant required where halogen-free compliance is mandated | Choose TPSMA18AHM3_B/I if halogen-free material specification applies to your BOM |
Compared with SMAJ18A and TPSMA18AHE3_B/I, the TPSMA18AHM3_B/I uniquely combines halogen-free construction, AEC-Q101 qualification, and 185 °C junction rating - making it the preferred choice for automotive Tier-1 suppliers and high-reliability industrial designs requiring full material compliance.
Availability
TPSMA18AHM3_B/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O protection, and telecom line card surge suppression requiring stable component supply, halogen-free compliance, and AEC-Q101 qualification.
Supply support for TPSMA18AHM3_B/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 MOSFETs with emphasis on high-reliability, high-temperature, and automotive-grade performance.
The TPSMA series belongs to Vishay's PAR® (Protected Anisotropic Rectifier) transient voltage suppressor family, engineered specifically for robust surge immunity in harsh environments including automotive under-hood, industrial control, and telecommunications infrastructure.
FAQ
What is the clamping voltage of the TPSMA18AHM3_B/I at its rated peak pulse current?
The TPSMA18AHM3_B/I has a maximum clamping voltage (VC) of 25.5 V at its rated peak pulse current (IPPM) of 15.9 A, measured under the standard 10/1000 µs waveform condition. This value is guaranteed per the Vishay datasheet (Document Number: 88405) and defines the upper voltage limit imposed on protected circuits during surge events. The TPSMA18AHM3_B/I maintains this clamping performance across its full operating temperature range.
Is the TPSMA18AHM3_B/I AEC-Q101 qualified?
Yes, the TPSMA18AHM3_B/I is AEC-Q101 qualified. As confirmed in the Vishay datasheet (Revision: 23-Jan-2024), the HM3 suffix denotes halogen-free, RoHS-compliant, and AEC-Q101 qualified construction. This qualification covers stress tests including HTRB, HTGB, AC/DC life test, and temperature cycling - validating suitability for automotive electronic systems. The TPSMA18AHM3_B/I carries this certification explicitly.
What does the "HM3" suffix mean in TPSMA18AHM3_B/I?
The "HM3" suffix in TPSMA18AHM3_B/I indicates halogen-free, RoHS-compliant, and AEC-Q101 qualified construction. Per Vishay's ordering nomenclature, HM3 denotes compliance with JEDEC J-STD-020 moisture sensitivity level 1, JESD201 Class 2 whisker resistance, and halogen-free material requirements (per IEC 61249-2-21). The TPSMA18AHM3_B/I meets all three criteria, distinguishing it from HE3 variants which omit halogen-free status.
What is the maximum operating junction temperature for the TPSMA18AHM3_B/I?
The maximum operating junction temperature (TJ max.) for the TPSMA18AHM3_B/I is +185 °C, as specified in the Vishay datasheet (Document Number: 88405). This rating enables reliable operation in high-temperature environments such as automotive engine compartments and industrial motor drives. The TPSMA18AHM3_B/I sustains its electrical parameters-including VBR, VC, and leakage-within specification up to this junction temperature.
How does the TPSMA18AHM3_B/I differ from the TPSMA18AHE3_B/I?
The TPSMA18AHM3_B/I and TPSMA18AHE3_B/I share identical electrical specifications, package (SMA/DO-214AC), and AEC-Q101 qualification, but differ in halogen content: HM3 is halogen-free, while HE3 is RoHS-compliant but not halogen-free. Both meet JESD201 Class 2 whisker testing and MSL Level 1. The TPSMA18AHM3_B/I is selected when halogen-free compliance is mandatory per customer or regulatory requirements.
TPSMA18AHM3_B/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:
- 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/I FAQ
1.How can I place an order for TPSMA18AHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for TPSMA18AHM3_B/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 TPSMA18AHM3_B/I reliable?
The price and inventory of TPSMA18AHM3_B/I 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/I is usually 5 days.
3.What payment methods are accepted for TPSMA18AHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPSMA18AHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPSMA18AHM3_B/I?
TPSMA18AHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPSMA18AHM3_B/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 TPSMA18AHM3_B/I?
For technical support, including TPSMA18AHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPSMA18AHM3_B/I requirements.
6.How does Aetrix verify that TPSMA18AHM3_B/I is sourced from the original manufacturer or authorized distributors?
All TPSMA18AHM3_B/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 TPSMA18AHM3_B/I meets industry standards.
7.What is the process for return or replacement of TPSMA18AHM3_B/I?
All TPSMA18AHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with TPSMA18AHM3_B/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 TPSMA18AHM3_B/I part is unused and in its original packaging.
Return procedure for TPSMA18AHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TPSMA18AHM3_B/I Tags
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