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Vishay General Semiconductor - Diodes Division TPSMA12AHE3_B/I
- Part No.:
- TPSMA12AHE3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
TPSMA12AHE3_B/I.pdf
- Description:
- TVS DIODE 10.2VWM 16.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,749
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Product details
Overview
TPSMA12AHE3_B/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features a 12.0 V nominal breakdown voltage (VBR), 24.0 V maximum clamping voltage (VC) at 5.0 A peak pulse current, 400 W peak pulse power (10/1000 µs), 1.0 W steady-state power dissipation, and operates up to +185 °C junction temperature - used in automotive sensor protection and industrial power rail surge suppression.
For engineers reviewing the TPSMA12AHE3_B/I datasheet, TPSMA12AHE3_B/I pinout, TPSMA12AHE3_B/I application, or TPSMA12AHE3_B/I equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification status, 10.2 V stand-off voltage (VWM), <1.0 µA reverse leakage at VWM, and compatibility with reflow soldering per J-STD-020 MSL Level 1.
Technical Context
This TVS diode employs passivated anisotropic rectifier technology optimized for high-temperature stability and low incremental surge resistance. Its unidirectional architecture provides forward conduction only during overvoltage events on the cathode-anode path, with clamping action triggered when reverse voltage exceeds 11.4 V (min VBR) at 1.0 mA test current.
The device is rated for 40 A non-repetitive peak forward surge current (IFSM) under 8.3 ms half-sine conditions and exhibits a typical temperature coefficient of VBR of +0.070 %/°C, enabling predictable voltage shift across its -65 °C to +185 °C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 11.4 / 12.0 / 12.6 V - defines precise clamping onset threshold at 1.0 mA; ensures reliable turn-on before downstream IC damage. |
| VWM | 10.2 V - maximum continuous reverse working voltage; sets safe operating margin below breakdown. |
| VC @ IPPM | 24.0 V at 5.0 A - peak clamped voltage during 10/1000 µs surge; determines protected circuit's maximum stress level. |
| PPPM | 400 W - peak pulse power handling capability; supports robust lightning and inductive-switching transient immunity. |
| TJ max. | +185 °C - enables operation in under-hood automotive and high-ambient industrial environments without derating. |
| Polarity | Unidirectional - allows forward conduction only; suited for DC power line protection where reverse blocking is required. |
| MSL Level | Level 1 (260 °C peak) - compatible with standard lead-free reflow profiles without moisture sensitivity concerns. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic case with matte tin-plated leads. Cathode identified by color band. Compliant with UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient voltage clamp input | Connected to protected line; conducts when reverse voltage exceeds VBR, shunting surge current to ground. |
| Anode | Reference/return path | Typically tied to system ground or lower-potential rail; completes clamping current path during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for safety-critical vehicle subsystems. |
| 185 °C junction rating | Enables uninterrupted operation in engine control units, battery management systems, and other high-thermal-load locations. |
| 400 W peak pulse power (10/1000 µs) | Withstands repetitive surges from relay coil switching, motor commutation, and ISO 7637-2 Pulse 1/2a/5a events. |
| Low clamping ratio (VC/VBR ≈ 2.0) | Minimizes overvoltage overshoot during clamping - critical for protecting 12 V-rated logic and analog interfaces. |
| MSL Level 1, 260 °C peak | Eliminates pre-bake requirement and supports single-pass lead-free reflow assembly in high-volume manufacturing. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Input Protection |
|---|---|
Use Scenario: Protects microcontroller GPIO and LIN bus transceivers from load dump and alternator ripple in 12 V vehicle networks. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between LIN line and ground, clamping transients above 10.2 V while remaining inert during normal operation. Use Value: Prevents latch-up and permanent damage to 5 V tolerant transceivers during ISO 16750-2 load dump events up to 35 V. | Use Scenario: Shields digital input terminals of programmable logic controllers from field-wiring induced surges in factory automation. IC Role / Device Role / Timing Role: Standoff protector on 24 V DC input channel, absorbing fast-rising transients from solenoid valve switching and contact bounce. Use Value: Maintains signal integrity by limiting transient voltage to ≤24.0 V, ensuring reliable state detection without false triggering. |
| Automotive Camera Power Rail | Telecom PoE Interface Protection |
Use Scenario: Safeguards image sensor and serializer ICs on rear-view camera power supply against ignition noise and ESD in ADAS systems. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12 V camera power line, mounted adjacent to connector to intercept surges before reaching sensitive analog front-end. Use Value: Withstands 185 °C ambient and clamps 400 W pulses without degradation - extends field life in sealed, thermally constrained housings. | Use Scenario: Provides secondary-level surge protection on powered device (PD) side of IEEE 802.3af/at PoE circuits after primary gas discharge tube. IC Role / Device Role / Timing Role: Fast-response TVS on DC input rail (44–57 V), suppressing residual transients that bypass upstream protection. Use Value: Low VC/VBR ratio ensures downstream DC-DC converter remains within absolute maximum ratings during combined lightning and switching surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12A | Same SMA package, 12 V VBR, but rated for 400 W (10/1000 µs); not AEC-Q101 qualified; higher VC = 19.9 V. | Lacks automotive qualification; suitable for commercial/industrial use only. | Select if AEC-Q101 compliance is unnecessary and lower clamping voltage is prioritized. |
| SMCJ12A | Higher power (1500 W), larger SMC (DO-214AB) package; same VBR and polarity; AEC-Q101 available in HE3 variant. | Requires PCB layout change due to larger footprint and thermal pad area; better for high-energy surges. | Choose when system-level surge requirements exceed 400 W, e.g., in heavy-duty vehicle power distribution. |
Compared with SMAJ12A and SMCJ12A, the TPSMA12AHE3_B/I delivers automotive-grade reliability in the smallest qualified SMA footprint, balancing space-constrained design needs with validated high-temperature performance and precise 12 V clamping behavior.
Availability
TPSMA12AHE3_B/I is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, and telecom power-over-Ethernet interfaces requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for TPSMA12AHE3_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, MOSFETs, and protection devices with emphasis on reliability, thermal performance, and automotive qualification.
The TPSMA series belongs to Vishay's PAR® (Protection and Regulation) transient voltage suppressor family, engineered specifically for high-temperature, high-reliability surge protection in automotive and industrial power and signal lines.
FAQ
What is the clamping voltage of the TPSMA12AHE3_B/I at its rated peak pulse current?
The TPSMA12AHE3_B/I has a maximum clamping voltage (VC) of 24.0 V at 5.0 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured per JEDEC test conditions and reflects the actual voltage seen by protected circuitry during worst-case transient events. The TPSMA12AHE3_B/I maintains this clamping performance across its full operating temperature range.
Is the TPSMA12AHE3_B/I AEC-Q101 qualified?
Yes, the TPSMA12AHE3_B/I is AEC-Q101 qualified. The "HE3" suffix denotes RoHS-compliant and AEC-Q101 qualified construction, verified through stress tests including high-temperature reverse bias, temperature cycling, and ESD. This qualification makes the TPSMA12AHE3_B/I suitable for automotive applications such as body control modules and ADAS camera power rails.
What is the stand-off voltage (VWM) and why does it matter for TPSMA12AHE3_B/I placement?
The TPSMA12AHE3_B/I has a stand-off voltage (VWM) of 10.2 V, meaning it remains non-conductive up to this reverse voltage. This parameter ensures the device does not interfere with normal 12 V system operation while providing margin before breakdown. For correct placement, the TPSMA12AHE3_B/I must be positioned so that VWM exceeds the maximum steady-state voltage on the protected line - e.g., 12 V ±10% nominal systems.
Can the TPSMA12AHE3_B/I be used in bidirectional configurations?
No, the TPSMA12AHE3_B/I is unidirectional only, as confirmed in the Vishay datasheet. It conducts in reverse bias above VBR but blocks forward current beyond ~3.5 V. For bidirectional protection (e.g., AC signal lines), a pair of TPSMA12AHE3_B/I devices in series opposition or a dedicated bidirectional TVS like TPSMA12CAHE3_B/I would be required - the TPSMA12AHE3_B/I alone cannot protect both polarities.
What is the thermal derating behavior of the TPSMA12AHE3_B/I above 25 °C ambient?
The TPSMA12AHE3_B/I follows standard thermal derating curves per Figure 2 in its datasheet: peak pulse power (PPPM) decreases linearly above 25 °C ambient, reaching ~50% of 400 W at ~125 °C case temperature. Its 185 °C maximum junction temperature allows sustained operation at elevated ambient, but designers must ensure PCB copper pad area (0.2" × 0.2") and airflow meet Vishay's recommended layout to maintain thermal performance. The TPSMA12AHE3_B/I's derating is defined relative to initial junction temperature, not ambient alone.
TPSMA12AHE3_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):
- 10.2V
- Voltage - Breakdown (Min):
- 11.4V
- Voltage - Clamping (Max) @ Ipp:
- 16.7V
- Current - Peak Pulse (10/1000µs):
- 24A
- 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)
TPSMA12AHE3_B/I FAQ
1.How can I place an order for TPSMA12AHE3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for TPSMA12AHE3_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 TPSMA12AHE3_B/I reliable?
The price and inventory of TPSMA12AHE3_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 TPSMA12AHE3_B/I is usually 5 days.
3.What payment methods are accepted for TPSMA12AHE3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPSMA12AHE3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPSMA12AHE3_B/I?
TPSMA12AHE3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPSMA12AHE3_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 TPSMA12AHE3_B/I?
For technical support, including TPSMA12AHE3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPSMA12AHE3_B/I requirements.
6.How does Aetrix verify that TPSMA12AHE3_B/I is sourced from the original manufacturer or authorized distributors?
All TPSMA12AHE3_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 TPSMA12AHE3_B/I meets industry standards.
7.What is the process for return or replacement of TPSMA12AHE3_B/I?
All TPSMA12AHE3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with TPSMA12AHE3_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 TPSMA12AHE3_B/I part is unused and in its original packaging.
Return procedure for TPSMA12AHE3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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