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Vishay General Semiconductor - Diodes Division TPSMB20AHM3_A/I
- Part No.:
- TPSMB20AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
TPSMB20AHM3_A/I.pdf
- Description:
- TVS DIODE 17.1VWM 27.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
TPSMB20AHM3_A/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for clamping inductive and lightning-induced transients on power rails and signal lines. It features a 20 V breakdown voltage (VBR = 19–21 V), 17.1 V stand-off voltage (VWM), 600 W peak pulse power (10/1000 µs), 21.7 A peak pulse current (IPPM), and 27.7 V maximum clamping voltage (VC) at IPPM. It is used to protect MOSFETs, microcontrollers, and sensor interfaces in automotive power supplies.
For engineers reviewing the TPSMB20AHM3_A/I datasheet, TPSMB20AHM3_A/I pinout, TPSMB20AHM3_A/I application, or TPSMB20AHM3_A/I equivalent, key selection criteria include unidirectional polarity, SMB (DO-214AA) package compatibility, AEC-Q101 qualification, TJ = 185 °C operation, and 0.082 %/°C VBR temperature coefficient - all critical for high-reliability automotive and industrial surge protection design.
Technical Context
This TVS diode employs passivated anisotropic rectifier technology with junction passivation optimized for stable clamping under repetitive surge stress. Its 185 °C maximum junction temperature and MSL Level 1 rating support reflow soldering at 260 °C peak and long-term reliability in under-hood automotive environments.
The device delivers low incremental surge resistance and fast response time (<1 ns), enabling effective suppression of ESD and switching transients before downstream ICs are damaged. Clamping performance is specified per ANSI/IEEE C62.35, with VC = 27.7 V at IPPM = 21.7 A (10/1000 µs waveform), ensuring predictable overvoltage limiting during fault events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 19.0 / 20.0 / 21.0 V - defines precise voltage threshold at which avalanche conduction begins; ensures reliable turn-on before protected circuit exceeds safe operating limits |
| VWM | 17.1 V - maximum continuous reverse working voltage; sets upper limit for normal operation without leakage degradation |
| VC @ IPPM | 27.7 V - clamped voltage during 600 W surge; determines worst-case overvoltage seen by downstream components |
| IPPM | 21.7 A - peak surge current capability (10/1000 µs); quantifies energy-handling capacity for common transient waveforms |
| TJ max. | +185 °C - enables use in high-temperature automotive locations (e.g., engine control units) without derating |
| Package | SMB (DO-214AA) - industry-standard surface-mount outline with 0.205" × 0.220" footprint; compatible with automated assembly and IPC-7351B land patterns |
| AEC-Q101 | Qualified - confirms compliance with automotive-grade stress testing (HTOL, TC, HAST, etc.), required for Tier-1 production |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when VRM exceeds VBR; polarity must match system grounding scheme |
| Anode | Reference node | Typically tied to ground or low-impedance return path; completes current loop during clamping; requires low-inductance layout |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Supports robust protection against ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 3 surges without derating |
| TJ = 185 °C capability | Enables uninterrupted operation in under-hood ECUs, battery management systems, and motor drive inverters |
| AEC-Q101 qualified (HM3 suffix) | Validates reliability for automotive applications including ADAS, body control modules, and infotainment power rails |
| Low clamping ratio (VC/VBR ≈ 1.385) | Minimizes overvoltage margin needed in protected circuit design; reduces risk of latch-up or gate oxide damage |
| MSL Level 1, 260 °C peak reflow | Eliminates moisture sensitivity concerns and allows standard SMT assembly without baking or special handling |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Suppresses load-dump transients (ISO 16750-2) and alternator ripple on 12 V battery-fed ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp overvoltage spikes before they reach LDOs or MCU VDD. Use Value: Limits peak rail voltage to ≤27.7 V during 100 V/100 ms load dump, preventing brownout reset or permanent damage to 3.3 V/5 V logic. |
Use Scenario: Shields analog front-end inputs of pressure/temperature sensors in PLC I/O modules from field-wiring induced surges. IC Role / Device Role / Timing Role: TVS connected across differential signal pair (e.g., RS-485 A/B) to shunt common-mode transients. Use Value: Clamps ±30 V transients to <±28 V within nanoseconds, preserving signal integrity and avoiding ADC saturation or input stage breakdown. |
| Consumer Device DC Input Protection | Telecom Power Supply Surge Suppression |
Use Scenario: Protects USB-C PD port input stages in portable medical monitors from hot-plug and adapter surge events. IC Role / Device Role / Timing Role: Placed upstream of buck converter input to absorb 600 W pulses without thermal runaway. Use Value: Withstands repeated 10/1000 µs surges up to 21.7 A while maintaining VWM = 17.1 V, ensuring no false triggering during normal 20 V PD negotiation. |
Use Scenario: Guards -48 V telecom power distribution boards against lightning-induced surges on central office feed lines. IC Role / Device Role / Timing Role: Mounted on primary side of DC-DC converter input to clamp negative-going transients to safe levels. Use Value: Delivers 27.7 V clamping at 21.7 A with <1 ns response, meeting Telcordia GR-1089-CORE Level 3 requirements for Class 3 equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20AHE3/A | Same VBR (19–21 V), lower PPPM = 400 W, SMA package (smaller footprint, lower thermal mass) | Limited to lower-energy transients; not AEC-Q101 qualified; unsuitable for automotive under-hood use | Select when space-constrained PCBs require smaller footprint and surge energy is ≤400 W |
| TPSMB20AHM3_A/H | Identical electrical specs and qualification; differs only in tape-and-reel packaging (750 pcs vs. 3200 pcs per reel) | No functional difference; choice depends solely on production volume and SMT feeder compatibility | Select for low-volume prototyping or when 7" reels align with existing pick-and-place setup |
Compared with SMAJ20AHE3/A and TPSMB20AHM3_A/H, the TPSMB20AHM3_A/I offers full AEC-Q101 qualification and 600 W surge capacity in the robust SMB package - making it the preferred choice for automotive and high-reliability industrial designs where thermal stability and long-term surge endurance are mandatory.
Availability
TPSMB20AHM3_A/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, consumer DC power inputs, and telecom power supply surge suppression requiring stable component supply and AEC-Q101-compliant sourcing.
Supply support for TPSMB20AHM3_A/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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for demanding industrial and automotive applications.
The TPSMB series belongs to Vishay's PAR® transient voltage suppressor family, engineered specifically for high-temperature, high-surge environments such as automotive power systems and industrial automation - with emphasis on AEC-Q101 compliance and 185 °C junction operation.
FAQ
What is the breakdown voltage tolerance for TPSMB20AHM3_A/I?
The TPSMB20AHM3_A/I has a guaranteed breakdown voltage range of 19.0 V to 21.0 V at 1 mA test current, with a nominal value of 20.0 V. This ±5 % tolerance ensures consistent clamping behavior across production lots and supports robust design margins for protected circuits. The specification is verified per ANSI/IEEE C62.35 and confirmed in Vishay's official datasheet revision 23-Jan-2024 (Document Number: 88406).
Is TPSMB20AHM3_A/I suitable for bidirectional transient protection?
No, TPSMB20AHM3_A/I is strictly unidirectional and must be used with correct polarity - cathode connected to the line being protected, anode to ground. For bidirectional protection, a separate device such as the SMBJ20CA or a dual-diode configuration is required. The datasheet explicitly states "Available in unidirectional polarity only", and no reverse-direction clamping data is provided for TPSMB20AHM3_A/I.
Does TPSMB20AHM3_A/I meet automotive qualification standards?
Yes, TPSMB20AHM3_A/I carries the HM3 suffix, confirming it is halogen-free, RoHS-compliant, and AEC-Q101 qualified. This certification covers stress tests including high-temperature operating life (HTOL), temperature cycling (TC), and highly accelerated stress test (HAST), validating its suitability for automotive applications such as body control modules and powertrain subsystems.
What is the maximum clamping voltage of TPSMB20AHM3_A/I at rated surge current?
The TPSMB20AHM3_A/I clamps to a maximum of 27.7 V when subjected to its rated peak pulse current of 21.7 A (10/1000 µs waveform). This VC value is measured under standardized conditions per JEDEC and ANSI/IEEE C62.35, and directly determines the peak overvoltage imposed on downstream components during transient events.
Can TPSMB20AHM3_A/I be used in place of SMAJ20AHE3/A without layout changes?
No - although both devices share identical VBR and polarity, TPSMB20AHM3_A/I uses the larger SMB (DO-214AA) package, whereas SMAJ20AHE3/A uses the smaller SMA (DO-214AC) outline. Their footprints are not interchangeable; replacing one with the other requires PCB land pattern modification and thermal validation due to differing thermal dissipation characteristics.
TPSMB20AHM3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- 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):
- 21.7A
- Power - Peak Pulse:
- 600W
- 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-214AA (SMB)
TPSMB20AHM3_A/I FAQ
1.How can I place an order for TPSMB20AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for TPSMB20AHM3_A/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 TPSMB20AHM3_A/I reliable?
The price and inventory of TPSMB20AHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPSMB20AHM3_A/I is usually 5 days.
3.What payment methods are accepted for TPSMB20AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPSMB20AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPSMB20AHM3_A/I?
TPSMB20AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPSMB20AHM3_A/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 TPSMB20AHM3_A/I?
For technical support, including TPSMB20AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPSMB20AHM3_A/I requirements.
6.How does Aetrix verify that TPSMB20AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All TPSMB20AHM3_A/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 TPSMB20AHM3_A/I meets industry standards.
7.What is the process for return or replacement of TPSMB20AHM3_A/I?
All TPSMB20AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with TPSMB20AHM3_A/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 TPSMB20AHM3_A/I part is unused and in its original packaging.
Return procedure for TPSMB20AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TPSMB20AHM3_A/I Tags
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ESD9B5.0ST5G
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DESD3V3E1BL-7B
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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