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Vishay General Semiconductor - Diodes Division SMAJ43AHE3/61
- Part No.:
- SMAJ43AHE3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ43AHE3/61.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,663
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Product details
Overview
SMAJ43AHE3/61 from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 43 V standoff voltage (VWM), 47.8–52.8 V breakdown voltage (VBR) at 1 mA, 69.4 V maximum clamping voltage (VC) at 5.8 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - suitable for automotive electronics, industrial sensor interfaces, and power supply input protection.
For engineers reviewing the SMAJ43AHE3/61 datasheet, SMAJ43AHE3/61 pinout, SMAJ43AHE3/61 application, or SMAJ43AHE3/61 equivalent, this AEC-Q101 qualified device delivers verified clamping performance, low incremental surge resistance, and MSL Level 1 moisture sensitivity - critical for high-reliability board-level ESD and lightning surge protection in production-grade designs.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents <1 μA leakage at 43 V; during transients exceeding VBR, it avalanches rapidly (<1 ns response) to clamp the line at ≤69.4 V while diverting up to 5.8 A (10/1000 μs). Its glass-passivated junction ensures stable breakdown and long-term reliability across -55 °C to +150 °C operating range.
The SMAJ43AHE3/61 is rated for 40 A non-repetitive forward surge (8.3 ms half-sine), supports automated SMT placement, and meets UL 497B recognition (QVGQ2) for telecom and industrial protectors. Its thermal resistance (RθJA = 120 °C/W) assumes standard 0.2" × 0.2" copper pads per terminal - essential for thermal design validation in compact layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC rail margin. |
| VBR (min/max) | 47.8 V / 52.8 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on across temperature and unit variation. |
| VC @ IPPM | 69.4 V at 5.8 A - Measured clamping voltage under 10/1000 μs surge; determines protected IC's maximum stress level. |
| PPPM | 400 W - Peak pulse power handling capability; validates protection against IEC 61000-4-5 Level 3/4 surges on 12 V/24 V systems. |
| IFSM | 40 A - 8.3 ms single half-sine forward surge rating; supports inrush and load-dump immunity in automotive power nets. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood or enclosed industrial enclosures without derating. |
| MSL Level | Level 1 (J-STD-020) - No floor life limitation; allows indefinite storage and standard reflow without baking. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by band marking; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when VLINE > VBR. |
| Anode (unbanded end) | Reference node | Typically tied to system ground or lower-potential rail; completes clamping path during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units, body electronics, and ADAS sensor modules. |
| 400 W peak pulse power (10/1000 μs) | Withstands repeated IEC 61000-4-5 surges up to 1 kV open-circuit / 0.5 A short-circuit without degradation. |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes voltage overshoot during fast transients - critical for protecting 48 V tolerant CAN FD or LIN transceivers. |
| Glass passivated junction | Ensures stable VBR over time and temperature; eliminates parameter drift in harsh environments (-55 °C to +150 °C). |
| UL 497B recognized (QVGQ2) | Approved for use in telecom and industrial equipment requiring certified surge protection components. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: 12 V battery-fed ECUs exposed to ISO 7637-2 load dump pulses and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between power rail and chassis ground to clamp transients before they reach PMICs or microcontrollers. Use Value: Limits rail voltage to ≤69.4 V during 100 V/100 ms load dump events, preventing latch-up or gate oxide damage in downstream silicon. |
Use Scenario: 4–20 mA current loop transmitters interfacing with PLC analog inputs in factory automation. IC Role / Device Role / Timing Role: TVS mounted across loop terminals to absorb induced surges from nearby motor switching or lightning coupling. Use Value: Clamps common-mode transients to <70 V while maintaining <1 μA leakage at 24 V nominal - preserving loop accuracy and HART communication integrity. |
| Telecom Line Card Surge Suppression | Consumer Power Adapter Input Protection |
|
Use Scenario: DSL or POTS line cards subjected to longitudinal surges per ITU-T K.20/K.21. IC Role / Device Role / Timing Role: Paired unidirectional TVS devices (line-to-ground) providing primary protection ahead of GDT or MOV secondary stages. Use Value: Responds in <1 ns to limit surge energy delivered to sensitive line interface ICs, meeting UL 497B QVGQ2 certification requirements. |
Use Scenario: AC-DC adapter primary-side rectifier output protecting downstream switching controller ICs. IC Role / Device Role / Timing Role: TVS placed across bulk capacitor to clamp switch-node ringing and transformer leakage spikes. Use Value: Absorbs 400 W transient peaks without failure, enabling smaller bulk capacitors and eliminating need for snubber networks in cost-sensitive designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ43A-E3/61 | Commercial-grade version; same VWM, VBR, VC, and PPPM, but not AEC-Q101 qualified. | Lacks automotive qualification; suitable for consumer or industrial applications where extended temperature validation is not required. | Select SMAJ43AHE3/61 when AEC-Q101 compliance is mandatory; choose SMAJ43A-E3/61 for cost-sensitive non-automotive designs. |
| SMBJ43AHE3/61 | Same electrical specs but in SMB (DO-214AA) package - 2.6 mm wider, 0.3 mm taller, with higher thermal mass (RθJA = 90 °C/W). | Better thermal performance under sustained surge duty; requires larger PCB footprint and different pad layout. | Choose SMBJ43AHE3/61 if surge repetition rate exceeds 0.01 % or ambient temperature exceeds 85 °C; retain SMAJ43AHE3/61 for space-constrained automotive modules. |
Compared with SMAJ43A-E3/61, the SMAJ43AHE3/61 adds AEC-Q101 qualification without sacrificing clamping performance or footprint; versus SMBJ43AHE3/61, it trades thermal margin for 30 % smaller area - making it optimal for dense automotive ECUs where board space and qualification are both critical.
Availability
SMAJ43AHE3/61 is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and telecom line card protection requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMAJ43AHE3/61 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMAJ series is engineered for high-energy transient suppression in automotive, industrial, and telecom systems - delivering consistent clamping, AEC-Q101 qualification, and UL recognition in compact surface-mount packages.
FAQ
What is the clamping voltage of the SMAJ43AHE3/61 under a 10/1000 μs surge?
The SMAJ43AHE3/61 has a maximum clamping voltage (VC) of 69.4 V at 5.8 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is measured per IEC 61000-4-5 test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ43AHE3/61 maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C).
Is the SMAJ43AHE3/61 suitable for automotive applications?
Yes, the SMAJ43AHE3/61 is AEC-Q101 qualified and explicitly designated for automotive use with the "HE3" suffix. It meets stringent requirements for temperature cycling, humidity testing, and mechanical shock - validated for under-hood and cabin-mounted ECUs. The SMAJ43AHE3/61 is commonly deployed in powertrain control modules, body control units, and ADAS camera power supplies where ISO 7637-2 compliance is required.
What is the standoff voltage (VWM) and why does it matter for SMAJ43AHE3/61 selection?
The SMAJ43AHE3/61 has a standoff voltage (VWM) of 43 V - the maximum continuous reverse voltage it can block without significant leakage (<1 μA). This parameter ensures the device remains non-conductive during normal operation while allowing sufficient margin above typical 36 V or 42 V automotive system voltages. Selecting a VWM too close to nominal rail voltage risks premature conduction and power loss; the SMAJ43AHE3/61 provides 7 V headroom for 36 V systems.
How does the SMAJ43AHE3/61 compare to bidirectional TVS diodes like SMAJ43CA?
The SMAJ43AHE3/61 is unidirectional and intended for DC line protection with defined polarity (cathode to protected line), whereas SMAJ43CA is bidirectional and used for AC or floating signal lines. The SMAJ43AHE3/61 offers lower leakage (<1 μA vs. ≤5 μA for SMAJ43CA at VWM) and slightly tighter VBR tolerance. For automotive 12 V/24 V rails, the SMAJ43AHE3/61 is preferred due to its AEC-Q101 status and optimized DC clamping behavior.
What is the thermal resistance and how does it affect PCB layout for SMAJ43AHE3/61?
The SMAJ43AHE3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes minimal copper area - increasing pad size or adding internal ground planes reduces RθJA and improves surge endurance. For repeated surges, thermal design must ensure peak junction temperature stays below +150 °C; the SMAJ43AHE3/61's RθJL of 30 °C/W also supports localized heat sinking via lead connections.
SMAJ43AHE3/61 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 69.4V
- Current - Peak Pulse (10/1000µs):
- 5.8A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ43AHE3/61 FAQ
1.How can I place an order for SMAJ43AHE3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ43AHE3/61 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 SMAJ43AHE3/61 reliable?
The price and inventory of SMAJ43AHE3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ43AHE3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ43AHE3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ43AHE3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ43AHE3/61?
SMAJ43AHE3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ43AHE3/61 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 SMAJ43AHE3/61?
For technical support, including SMAJ43AHE3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ43AHE3/61 requirements.
6.How does Aetrix verify that SMAJ43AHE3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ43AHE3/61 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 SMAJ43AHE3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ43AHE3/61?
All SMAJ43AHE3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ43AHE3/61, 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 SMAJ43AHE3/61 part is unused and in its original packaging.
Return procedure for SMAJ43AHE3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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