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Vishay General Semiconductor - Diodes Division TPSMA20AHM3_B/I
- Part No.:
- TPSMA20AHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
TPSMA20AHM3_B/I.pdf
- Description:
- TVS DIODE 17.1VWM 27.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,452
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Product details
Overview
TPSMA20AHM3_B/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) diode designed for clamping inductive load switching and lightning-induced transients on power rails and signal lines. It features a 20 V breakdown voltage (VBR = 19.0–21.0 V), 400 W peak pulse power (10/1000 µs), 14.4 A peak pulse current, 17.1 V stand-off voltage, and 185 °C maximum junction temperature - deployed in automotive sensor protection and industrial power supply input stages.
For engineers reviewing the TPSMA20AHM3_B/I datasheet, TPSMA20AHM3_B/I pinout, TPSMA20AHM3_B/I application, or TPSMA20AHM3_B/I equivalent, key selection criteria include its AEC-Q101 qualification, SMA (DO-214AC) package compatibility, unidirectional polarity, 1.0 µA max reverse leakage at VWM, and 27.7 V clamping voltage at IPPM.
Technical Context
This TVS diode operates as a voltage-clamping device in parallel with protected circuitry, triggering when transient voltage exceeds its 19.0–21.0 V breakdown range. Its passivated anisotropic rectifier technology ensures stable performance up to TJ = 185 °C and low incremental surge resistance for effective energy diversion.
The device responds within picoseconds to transients and maintains clamping at 27.7 V under 14.4 A 10/1000 µs pulses. It is rated for 40 A non-repetitive forward surge (8.3 ms half-sine) and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak tolerance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 19.0 / 20.0 / 21.0 V - defines precise clamping initiation threshold across temperature and unit variation |
| VWM | 17.1 V - maximum continuous DC or RMS operating voltage before leakage rises significantly |
| VC @ IPPM | 27.7 V - clamped voltage during 400 W transient, limiting stress on downstream ICs or MOSFETs |
| IPPM | 14.4 A - peak surge current capability under standardized 10/1000 µs waveform |
| PPPM | 400 W - transient energy absorption capacity without failure, critical for automotive load-dump immunity |
| TJ max. | 185 °C - enables operation in under-hood automotive environments and high-power industrial enclosures |
| Leakage @ VWM | 1.0 µA - minimal standby power loss and signal integrity impact in always-on circuits |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, cathode indicated by molded band. Dimensions: 4.93 mm × 3.99 mm × 2.29 mm (L × W × H), with 2.54 mm lead pitch and matte tin-plated terminals solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction or transient clamping | Connected to lower-potential side of protected line (e.g., ground or return path) |
| Cathode | Current exit point during clamping; marked by color band | Connected to higher-potential side (e.g., VIN, signal line) - determines unidirectional clamping direction |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity, and mechanical shock |
| Halogen-free & RoHS-compliant | Meets global environmental compliance requirements without compromising thermal or electrical performance |
| MSL Level 1 rating | Zero moisture sensitivity - safe for standard SMT reflow without baking or special handling |
| 185 °C junction capability | Supports operation in high-ambient environments such as engine control units and motor drives |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes overvoltage overshoot during fast transients, improving system-level robustness |
Applications
| Automotive Sensor Protection | Industrial Power Input Stage |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor front-ends (e.g., pressure, temperature) from ISO 7637-2 pulse 1/2a/5a transients in vehicle ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS placed between signal line and ground to clamp negative-going spikes and positive load-dump surges. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V interface ICs while maintaining <1.0 µA leakage at 17.1 V nominal rail. | Use Scenario: Safeguarding AC-DC and DC-DC converter inputs against lightning-induced surges (IEC 61000-4-5) and inductive kickback in factory automation PLCs. IC Role / Device Role / Timing Role: Primary clamping element across bulk input capacitor, triggered within <1 ns to limit voltage to ≤27.7 V during 400 W transients. Use Value: Enables use of lower-voltage-rated MOSFETs and capacitors, reducing BOM cost without sacrificing surge immunity. |
| Consumer Device USB Port ESD | Telecom Line Interface Protection |
Use Scenario: Secondary protection for USB 2.0 data lines (D+/D−) in set-top boxes and smart displays exposed to human-body-model (HBM) ESD events. IC Role / Device Role / Timing Role: Fast-response shunt device absorbing >15 kV contact ESD (IEC 61000-4-2) before reaching USB PHY IC. Use Value: Complements integrated ESD diodes with higher energy handling (400 W vs. typical 100 W on-chip), extending system-level ESD margin. | Use Scenario: Protecting Ethernet PHY and DSL line drivers from induced surges on outdoor telecom wiring (ANSI/IEEE C62.41 Category A/B). IC Role / Device Role / Timing Role: Standoff-rated TVS on differential pair inputs, leveraging 17.1 V VWM to avoid interference with 12 V bias networks. Use Value: Maintains signal integrity during normal operation while clamping >600 V transients to <28 V, preserving PHY functionality. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20A | Same SMA package, 20 V VBR, but rated for 400 W with 1.0 W steady-state dissipation; not AEC-Q101 qualified | Lacks automotive qualification and halogen-free certification; suitable for commercial/industrial only | Select when AEC-Q101 is not required and cost sensitivity outweighs environmental compliance needs |
| TPSMA20AHM3_T/R | Identical electrical specs and AEC-Q101/halogen-free status; differs only in tape-and-reel packaging (7" vs. 13" reel) | No functional difference; reel size impacts SMT line setup and minimum order quantity | Choose based on production volume and pick-and-place feeder compatibility |
Compared with SMAJ20A and TPSMA20AHM3_T/R, the TPSMA20AHM3_B/I delivers identical transient suppression performance with verified automotive qualification and halogen-free compliance, making it the preferred choice for Tier-1 automotive designs where traceability and regulatory alignment are mandatory.
Availability
TPSMA20AHM3_B/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial power supplies, and telecom line interfaces requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant sourcing.
Supply support for TPSMA20AHM3_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 optoelectronics with emphasis on reliability, thermal performance, and application-specific validation.
The TPSMA series belongs to Vishay's PAR® (Protected Anisotropic Rectifier) transient voltage suppressor family, engineered for high-energy clamping in harsh environments including automotive under-hood, industrial motor controls, and outdoor telecom infrastructure.
FAQ
What is the exact breakdown voltage range for TPSMA20AHM3_B/I?
The TPSMA20AHM3_B/I has a guaranteed breakdown voltage (VBR) range of 19.0 V to 21.0 V at 1.0 mA test current, measured per ANSI/IEEE C62.35. This range reflects unit-to-unit variation and ensures reliable clamping onset across temperature and manufacturing lots - a critical parameter for coordinating with downstream IC absolute maximum ratings in the TPSMA20AHM3_B/I design.
Is TPSMA20AHM3_B/I qualified for automotive applications?
Yes, the TPSMA20AHM3_B/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" (halogen-free, RoHS-compliant, and AEC-Q101 qualified). It undergoes stress testing for temperature cycling, mechanical shock, and humidity resistance - making it suitable for engine control units, ADAS sensors, and body electronics where TPSMA20AHM3_B/I must operate reliably at 185 °C junction temperature.
What does the "B/I" suffix mean in TPSMA20AHM3_B/I?
The "B/I" suffix in TPSMA20AHM3_B/I indicates revision level "B" and packaging in 13-inch diameter plastic tape-and-reel (7500 units per reel). The "HM3" base denotes halogen-free, RoHS-compliant, and AEC-Q101-qualified construction. This full ordering code ensures traceability, consistent thermal performance, and compatibility with high-volume SMT assembly for TPSMA20AHM3_B/I deployments.
How does TPSMA20AHM3_B/I compare to bidirectional TVS diodes?
The TPSMA20AHM3_B/I is unidirectional only, optimized for DC-biased lines like power rails or single-ended signals referenced to ground. Unlike bidirectional variants, it provides lower capacitance and tighter VBR tolerance in one polarity - ideal where reverse conduction is not required. For AC-coupled or differential lines, a bidirectional part would be needed, but TPSMA20AHM3_B/I excels in efficiency and precision for grounded systems.
What is the clamping voltage of TPSMA20AHM3_B/I under surge conditions?
The TPSMA20AHM3_B/I clamps to a maximum of 27.7 V at its rated peak pulse current of 14.4 A (10/1000 µs waveform). This value is measured per standard test conditions and represents the upper limit of voltage seen by protected circuitry during transient events - a key specification used to verify margin against the absolute maximum ratings of ICs safeguarded by the TPSMA20AHM3_B/I.
TPSMA20AHM3_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):
- 17.1V
- Voltage - Breakdown (Min):
- 19V
- Voltage - Clamping (Max) @ Ipp:
- 27.7V
- Current - Peak Pulse (10/1000µs):
- 14.4A
- 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)
TPSMA20AHM3_B/I FAQ
1.How can I place an order for TPSMA20AHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for TPSMA20AHM3_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 TPSMA20AHM3_B/I reliable?
The price and inventory of TPSMA20AHM3_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 TPSMA20AHM3_B/I is usually 5 days.
3.What payment methods are accepted for TPSMA20AHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPSMA20AHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPSMA20AHM3_B/I?
TPSMA20AHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPSMA20AHM3_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 TPSMA20AHM3_B/I?
For technical support, including TPSMA20AHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPSMA20AHM3_B/I requirements.
6.How does Aetrix verify that TPSMA20AHM3_B/I is sourced from the original manufacturer or authorized distributors?
All TPSMA20AHM3_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 TPSMA20AHM3_B/I meets industry standards.
7.What is the process for return or replacement of TPSMA20AHM3_B/I?
All TPSMA20AHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with TPSMA20AHM3_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 TPSMA20AHM3_B/I part is unused and in its original packaging.
Return procedure for TPSMA20AHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TPSMA20AHM3_B/I Tags
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Diodes Incorporated
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Diodes Incorporated
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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