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Vishay General Semiconductor - Diodes Division TPSMA20AHE3_B/I
- Part No.:
- TPSMA20AHE3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
TPSMA20AHE3_B/I.pdf
- Description:
- TVS DIODE 17.1VWM 27.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
TPSMA20AHE3_B/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features 20 V nominal breakdown voltage (VBR = 19.0–21.0 V), 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. It is used in automotive sensor protection and industrial I/O interface surge suppression.
For engineers reviewing the TPSMA20AHE3_B/I datasheet, TPSMA20AHE3_B/I pinout, TPSMA20AHE3_B/I application, or TPSMA20AHE3_B/I equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification status, 1.0 W steady-state power dissipation, and compatibility with high-reliability PCB layouts using 5.0 mm × 5.0 mm copper pads per terminal.
Technical Context
The TPSMA20AHE3_B/I implements passivated anisotropic rectifier technology with optimized junction passivation for stable clamping under repetitive surge stress. Its 10/1000 µs waveform response delivers 14.4 V clamping at 14.4 A IPPM, with low incremental surge resistance ensuring minimal voltage overshoot during fast transients.
Rated for TJ = –65 °C to +185 °C, it supports automotive-grade thermal cycling and meets MSL Level 1 (260 °C peak reflow). The device is RoHS-compliant, halogen-free optional (HM3 suffix), and qualified to AEC-Q101 - confirmed by Vishay's ordering code HE3 designation for automotive applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 19.0 / 20.0 / 21.0 V - ensures reliable breakdown initiation above 17.1 V stand-off voltage while tolerating ±5 % variation across production lot |
| VWM | 17.1 V - maximum continuous reverse voltage before leakage exceeds 1 µA, defining safe operating margin for 15 V rail protection |
| VC @ IPPM | 27.7 V - clamped voltage seen by protected circuit during 14.4 A 10/1000 µs surge, limiting downstream stress |
| PPPM | 400 W - peak transient energy absorption capability under standard lightning/surge test waveform |
| TJ max. | +185 °C - enables operation in under-hood automotive environments and high-power industrial enclosures without derating |
| IFSM | 40 A - withstands 8.3 ms half-sine surge without failure, supporting motor drive and relay coil snubbing |
| Polarity | Unidirectional - protects only against positive-going transients relative to cathode; requires correct orientation in series with DC supply |
Pinout & Package
Package: SMA (DO-214AC), surface-mount plastic case with matte tin-plated leads, UL 94 V-0 rated molding compound, and cathode band marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when voltage exceeds VBR |
| Anode | Reference node | Typically tied to system ground or low-impedance return path; completes clamping loop during overvoltage event |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use per stress test requirements including HTGB, HTRB, and temperature cycling - required for engine control and ADAS sensor modules |
| Junction passivation design | Reduces parameter drift and leakage growth under high-temperature bias stress, extending lifetime in 15-year automotive deployments |
| MSL Level 1 rating | Supports single-pass 260 °C lead-free reflow without popcorn effect or delamination - eliminates pre-bake requirement |
| Low clamping ratio (VC/VBR) | 1.385 - tight clamping margin minimizes overvoltage exposure to downstream ICs such as CAN transceivers or ADC front-ends |
| 185 °C junction rating | Enables placement near heat sources (e.g., power MOSFETs, DC-DC inductors) without thermal derating penalties |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting LIN bus sensors and pressure transducers in engine compartments exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between sensor signal line and chassis ground to clamp ESD and switching transients. Use Value: Limits transient voltage to ≤27.7 V during 14.4 A surges, preventing latch-up or gate oxide damage in 5 V or 3.3 V sensor ASICs. | Use Scenario: Safeguarding RS-485 transceiver inputs in factory automation PLCs subjected to inductive kickback from solenoid drivers. IC Role / Device Role / Timing Role: Standoff protection element on differential bus lines, absorbing common-mode surges before they reach the transceiver ESD structure. Use Value: Maintains signal integrity by clamping within 1 ns, with <1 µA leakage at 17.1 V to avoid false triggering of receiver thresholds. |
| Power Supply Rail Clamping | Consumer Device USB Port Protection |
Use Scenario: Secondary overvoltage protection on 12 V DC input rails of embedded controllers after primary DC-DC converter stage. IC Role / Device Role / Timing Role: Fast-acting shunt limiter that activates only during abnormal conditions exceeding 17.1 V, preserving normal regulation. Use Value: Withstands 40 A 8.3 ms forward surge (IFSM), enabling robust protection against sustained overvoltage faults without catastrophic failure. | Use Scenario: ESD and surge suppression on VBUS line of USB-C ports in smart home hubs exposed to human-body-model (HBM) events. IC Role / Device Role / Timing Role: High-energy TVS placed upstream of USB power switch to absorb >30 kV contact discharge per IEC 61000-4-2. Use Value: Delivers 400 W peak pulse handling with <100 ps response time, preventing latch-up in USB PD controllers while maintaining <1 µA standby leakage. |
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 SMA package, 20 V VBR, but lower PPPM = 400 W (identical), non-AEC-Q101 qualified, higher VC = 32.4 V | Lacks automotive qualification; suitable for commercial/industrial only where AEC-Q101 not mandated | Select SMAJ20A only if AEC-Q101 is unnecessary and higher clamping voltage is acceptable in system-level testing |
| TPSMA20AHM3_B/I | Identical electrical specs and AEC-Q101 qualification; differs only in halogen-free material composition per JEDEC J-STD-201 Class 2 | Required for RoHS+halogen-free compliance mandates in EU automotive Tier 1 supply chains | Choose TPSMA20AHM3_B/I when halogen-free certification is contractually required; otherwise TPSMA20AHE3_B/I satisfies standard AEC-Q101 needs |
Compared with SMAJ20A and TPSMA20AHM3_B/I, the TPSMA20AHE3_B/I provides identical surge performance and automotive qualification with standard RoHS compliance - making it the default choice for cost-sensitive AEC-Q101 designs without halogen restrictions.
Availability
TPSMA20AHE3_B/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O interface hardening, and power supply rail clamping requiring stable component supply across multi-year production cycles.
Supply support for TPSMA20AHE3_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 automotive qualification.
The TPSMAxxA family was engineered specifically for high-temperature, high-reliability transient suppression in automotive and industrial environments - delivering AEC-Q101 compliance, 185 °C operation, and consistent clamping behavior across life.
FAQ
What is the clamping voltage of the TPSMA20AHE3_B/I at its rated peak pulse current?
The TPSMA20AHE3_B/I has a maximum clamping voltage (VC) of 27.7 V at its rated peak pulse current (IPPM) of 14.4 A under the standard 10/1000 µs waveform. This value is measured per Figure 1 in Vishay Document 88405 and defines the upper voltage limit imposed on protected circuits during surge events. The TPSMA20AHE3_B/I maintains this clamping performance across its full operating temperature range.
Is the TPSMA20AHE3_B/I qualified to AEC-Q101?
Yes, the TPSMA20AHE3_B/I is explicitly AEC-Q101 qualified, as confirmed by Vishay's ordering nomenclature: the "HE3" suffix denotes RoHS-compliant and AEC-Q101 qualified variants. This qualification covers stress tests including high-temperature reverse bias (HTRB), high-temperature gate bias (HTGB), and temperature cycling - validating suitability for automotive powertrain and body electronics applications.
What does the "B/I" suffix mean in TPSMA20AHE3_B/I?
The "B/I" suffix in TPSMA20AHE3_B/I indicates revision level "B" and packaging format "I", meaning 13-inch diameter plastic tape and reel with 7500 units per reel. This matches Vishay's ordering information table in Document 88405, where "I" denotes the high-volume reel configuration versus "H" for 7-inch reels (1800 units). The "B" revision reflects updated manufacturing process or test criteria per Vishay's change control.
Can the TPSMA20AHE3_B/I be used in bidirectional protection circuits?
No, the TPSMA20AHE3_B/I is unidirectional only, as stated in the Features section of Vishay Document 88405. It conducts surge current only from cathode to anode and must be oriented with cathode toward the protected line. For bidirectional protection, a separate device such as the TPSMA20CA (center-tapped, bidirectional variant) would be required - the TPSMA20AHE3_B/I does not support reverse-polarity transient suppression.
What is the maximum steady-state power dissipation of the TPSMA20AHE3_B/I?
The TPSMA20AHE3_B/I has a maximum steady-state power dissipation (PD) of 1.0 W at ambient temperature (TA) = 25 °C, derating linearly above that temperature per Figure 2 in Vishay Document 88405. This rating applies to continuous reverse-bias leakage and forward-conduction losses - not transient events - and determines heatsinking requirements for long-term DC operation in high-temperature enclosures.
TPSMA20AHE3_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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 185°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
TPSMA20AHE3_B/I FAQ
1.How can I place an order for TPSMA20AHE3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for TPSMA20AHE3_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 TPSMA20AHE3_B/I reliable?
The price and inventory of TPSMA20AHE3_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 TPSMA20AHE3_B/I is usually 5 days.
3.What payment methods are accepted for TPSMA20AHE3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPSMA20AHE3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPSMA20AHE3_B/I?
TPSMA20AHE3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPSMA20AHE3_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 TPSMA20AHE3_B/I?
For technical support, including TPSMA20AHE3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPSMA20AHE3_B/I requirements.
6.How does Aetrix verify that TPSMA20AHE3_B/I is sourced from the original manufacturer or authorized distributors?
All TPSMA20AHE3_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 TPSMA20AHE3_B/I meets industry standards.
7.What is the process for return or replacement of TPSMA20AHE3_B/I?
All TPSMA20AHE3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with TPSMA20AHE3_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 TPSMA20AHE3_B/I part is unused and in its original packaging.
Return procedure for TPSMA20AHE3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TPSMA20AHE3_B/I Tags
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