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Vishay General Semiconductor - Diodes Division TPSMA20AHM3_B/H
- Part No.:
- TPSMA20AHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
TPSMA20AHM3_B/H.pdf
- Description:
- TVS DIODE 17.1VWM 27.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,557
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Product details
Overview
TPSMA20AHM3_B/H from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features 20 V nominal breakdown voltage (VBR), 17.1 V stand-off voltage (VWM), 400 W peak pulse power (10/1000 µs), 14.4 V maximum clamping voltage at 14.4 A peak pulse current, and operates up to +185 °C junction temperature - used in automotive sensor protection and industrial power supply input stages.
For engineers reviewing the TPSMA20AHM3_B/H datasheet, TPSMA20AHM3_B/H pinout, TPSMA20AHM3_B/H application, or TPSMA20AHM3_B/H equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification status, TJ = 185 °C capability, low clamping ratio (VC/VBR ≈ 0.72), and halogen-free RoHS-compliant construction per HM3 suffix.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology with optimized junction passivation for stable performance under high-temperature stress. Its unidirectional configuration enables robust clamping of positive-going transients while maintaining low leakage (<1 µA at VWM) and fast response time.
The device is rated for 400 W peak pulse power (10/1000 µs waveform, 0.01% duty cycle) and supports repetitive surge events when mounted on 5.0 mm × 5.0 mm copper pads. It meets MSL Level 1 per J-STD-020 and passes JESD201 Class 2 whisker testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 19.0 / 20.0 / 21.0 V - ensures reliable triggering above system operating voltage with margin against tolerance drift |
| VWM | 17.1 V - maximum continuous reverse voltage before significant leakage begins; defines safe operating window |
| VC @ IPPM | 27.7 V - clamping voltage at 14.4 A peak pulse current; determines protected circuit's maximum transient exposure |
| PPPM | 400 W - peak transient energy absorption capacity using standard 10/1000 µs waveform |
| TJ max. | +185 °C - enables operation in under-hood automotive and high-ambient industrial environments |
| Polarity | Unidirectional - protects against positive transients only; requires correct cathode orientation in PCB layout |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with 5.28 mm length, 4.50 mm width, and 2.29 mm height |
Pinout & Package
SMA (DO-214AC) package with molded epoxy body, matte tin-plated leads, and cathode band marking. Mounting requires minimum recommended pad layout per datasheet Figure 4.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient clamp output node | Connected to protected line; conducts during overvoltage to shunt current to ground |
| Anode | Reference/return path | Typically tied to system ground or lower-potential rail; completes clamping path |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| Halogen-free, RoHS-compliant | Meets environmental compliance requirements for modern automotive and industrial electronics |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow without moisture sensitivity concerns |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 pulse 1/2a) |
| 185 °C junction rating | Enables placement near heat sources such as power MOSFETs or DC/DC converters |
Applications
| Automotive Sensor Protection | Industrial Power Input Stage |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor front-ends from load dump and inductive switching spikes in engine control modules. IC Role / Device Role / Timing Role: Transient voltage suppressor placed across signal/power pins to clamp ESD and surge events below IC damage threshold. Use Value: Prevents latch-up or gate oxide failure in 3.3 V/5 V interface ICs by limiting transient excursion to ≤27.7 V at 14.4 A. | Use Scenario: Safeguarding AC-DC and DC-DC converter inputs against lightning-induced surges and relay contact bounce in factory automation PLCs. IC Role / Device Role / Timing Role: Primary-level TVS on 24 V rail upstream of input filter and regulator ICs. Use Value: Absorbs 400 W pulses without degradation, maintaining system uptime where replacement access is limited. |
| Consumer Power Adapter Output | Telecom Line Interface |
Use Scenario: Secondary-side overvoltage protection in USB-C PD adapters and multi-output wall chargers exposed to hot-plug and cable discharge events. IC Role / Device Role / Timing Role: Fast-response clamping device parallel to output capacitor and downstream USB controller. Use Value: Limits transient overshoot to <28 V, preserving USB PD compliance and preventing port controller reset. | Use Scenario: Surge suppression on Ethernet PHY power rails and auxiliary bias lines in PoE-powered switches and base stations. IC Role / Device Role / Timing Role: Standby-mode TVS protecting low-noise LDOs and clock buffers from induced transients on shared backplane supplies. Use Value: Maintains <1 µA leakage at 17.1 V, avoiding quiescent current impact on always-on telecom subsystems. |
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 (19–21 V), but rated for 400 W with 8.3 ms half-sine waveform; not AEC-Q101 qualified | Lacks automotive qualification and 185 °C rating; suitable for commercial-grade power supplies only | Select if AEC-Q101 and high-TJ are not required; verify thermal derating for long-duration surges |
| 1.5SMC20A | Higher package thermal mass (SMC/DO-214AB); same electrical specs but larger footprint and higher IFSM (50 A vs. 40 A) | Requires PCB redesign due to 7.11 mm × 6.22 mm outline; better for high-repetition surge environments | Choose when board space allows and surge repetition rate exceeds 0.01%; avoid for space-constrained automotive modules |
Compared with SMAJ20A and 1.5SMC20A, the TPSMA20AHM3_B/H delivers automotive-grade reliability in the smallest standardized surface-mount TVS outline, enabling direct integration into compact ECU designs without sacrificing clamping performance or thermal robustness.
Availability
TPSMA20AHM3_B/H is available at Aetrix Electronics and suitable for automotive sensor protection, industrial power input stages, and consumer power adapter output circuits requiring stable component supply and long-term lifecycle support.
Supply support for TPSMA20AHM3_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 TPSMA series belongs to Vishay's PAR® family of transient voltage suppressors, engineered specifically for high-reliability protection in automotive, industrial, and telecom systems where sustained operation at elevated junction temperatures is critical.
FAQ
What is the meaning of the "HM3" suffix in TPSMA20AHM3_B/H?
The HM3 suffix in TPSMA20AHM3_B/H indicates halogen-free, RoHS-compliant construction and full AEC-Q101 qualification. It confirms compliance with automotive reliability standards including temperature cycling, highly accelerated life testing (HALT), and electrostatic discharge (ESD) immunity. The "B/H" denotes packaging in 7-inch tape-and-reel format with 1800 units per reel.
Does TPSMA20AHM3_B/H support bidirectional transient suppression?
No, TPSMA20AHM3_B/H is strictly unidirectional. Its internal structure provides clamping only for positive transients relative to the anode. For bidirectional protection, two devices must be used in series opposition or a dedicated bidirectional TVS like TPSMA20CA must be selected. The datasheet explicitly states "Available in uni-directional polarity only."
What is the maximum clamping voltage of TPSMA20AHM3_B/H and how is it measured?
The maximum clamping voltage (VC) of TPSMA20AHM3_B/H is 27.7 V, measured at 14.4 A peak pulse current (IPPM) using a 10/1000 µs waveform. This value is guaranteed per the datasheet's Electrical Characteristics table and reflects worst-case voltage seen by downstream circuitry during standardized surge events.
Can TPSMA20AHM3_B/H be used in place of TPSMA20AHE3_B/H?
Yes, TPSMA20AHM3_B/H is functionally identical to TPSMA20AHE3_B/H in electrical and thermal specifications, differing only in material composition: HM3 is halogen-free while HE3 is standard RoHS-compliant. Both are AEC-Q101 qualified and share identical VBR, VC, PPPM, and package dimensions. No layout or schematic changes are needed for substitution.
What is the thermal resistance junction-to-ambient (RθJA) for TPSMA20AHM3_B/H?
The datasheet does not specify RθJA for TPSMA20AHM3_B/H as a standalone parameter. Thermal performance is defined via derating curves (Figure 2) and mounting conditions: 5.0 mm × 5.0 mm copper pads per terminal. At 25 °C ambient, the device dissipates 1.0 W continuously; above that temperature, power must be linearly reduced per the published derating curve.
TPSMA20AHM3_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):
- 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/H FAQ
1.How can I place an order for TPSMA20AHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for TPSMA20AHM3_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 TPSMA20AHM3_B/H reliable?
The price and inventory of TPSMA20AHM3_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 TPSMA20AHM3_B/H is usually 5 days.
3.What payment methods are accepted for TPSMA20AHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPSMA20AHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPSMA20AHM3_B/H?
TPSMA20AHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPSMA20AHM3_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 TPSMA20AHM3_B/H?
For technical support, including TPSMA20AHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPSMA20AHM3_B/H requirements.
6.How does Aetrix verify that TPSMA20AHM3_B/H is sourced from the original manufacturer or authorized distributors?
All TPSMA20AHM3_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 TPSMA20AHM3_B/H meets industry standards.
7.What is the process for return or replacement of TPSMA20AHM3_B/H?
All TPSMA20AHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with TPSMA20AHM3_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 TPSMA20AHM3_B/H part is unused and in its original packaging.
Return procedure for TPSMA20AHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TPSMA20AHM3_B/H Tags
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