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Vishay General Semiconductor - Diodes Division SMAJ43A-E3/61
- Part No.:
- SMAJ43A-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ43A-E3/61.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ43A-E3/61 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 43 V standoff voltage (VWM), 47.8–52.8 V breakdown range at 1 mA, 69.4 V maximum clamping voltage at 5.8 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - deployed in automotive ECUs, industrial sensor interfaces, and DC power input protection.
For engineers reviewing the SMAJ43A-E3/61 datasheet, SMAJ43A-E3/61 pinout, SMAJ43A-E3/61 application, or SMAJ43A-E3/61 equivalent, key selection criteria include unidirectional polarity, 120 °C/W junction-to-ambient thermal resistance, AEC-Q101 qualification eligibility (via HE3 suffix variants), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a clamping device that conducts above its breakdown voltage to divert surge energy away from protected circuitry. Its glass-passivated junction ensures stable leakage performance (<1.0 μA at 43 V), while low incremental surge resistance enables rapid response to transients induced by inductive switching or ESD events.
The device is rated for repetitive 400 W pulses (duty cycle 0.01%) up to 78 V; above that threshold, derated to 300 W. Its 150 °C maximum junction temperature and MSL Level 1 moisture sensitivity support reflow soldering at 260 °C peak, and its matte tin-plated leads comply with J-STD-002 and JESD 22-B102 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 48 V nominal systems. |
| VBR min/max | 47.8 V / 52.8 V at 1 mA - Confirmed breakdown range ensures predictable turn-on across process variation and temperature. |
| VC @ IPPM | 69.4 V at 5.8 A - Clamping voltage under 10/1000 μs surge defines worst-case overvoltage seen by downstream ICs. |
| PPPM | 400 W - Peak pulse power handling capability with standard 10/1000 μs waveform; supports IEC 61000-4-5 Level 4 compliance when properly laid out. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance determines self-heating under sustained leakage or repeated surges on standard PCB pads. |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine) validates robustness against accidental polarity reversal during system startup. |
| TJ max | +150 °C - Maximum junction temperature enables operation in under-hood automotive environments and high-temperature industrial enclosures. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, single-ended unidirectional configuration with cathode band marking. Dimensions: 4.93 mm × 3.99 mm × 2.29 mm (L × W × H); weight: 0.064 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND or return path); carries surge current during clamping in unidirectional mode. |
| Cathode | Reverse-biased terminal | Marked with band; connected to protected line (e.g., 48 V rail); initiates avalanche conduction when transient exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables protection against IEC 61000-4-5 combination wave surges up to 4 kV without external series impedance in many 48 V applications. |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes overvoltage stress on downstream MOSFETs or interface ICs during transient events, preserving reliability margins. |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free reflow profiles without preconditioning, reducing manufacturing complexity and cost. |
| Glass passivated junction | Ensures long-term stability of leakage current (<1 μA at VWM) and breakdown voltage across temperature and humidity stress. |
| AEC-Q101 qualification option | HE3/HM3 suffix variants meet automotive-grade reliability requirements for engine control, body electronics, and ADAS power domains. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Clamp |
|---|---|
|
Use Scenario: Protecting 48 V supply rails in vehicle infotainment head units against load dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed directly at connector entry point to shunt surge energy to chassis ground. Use Value: Limits voltage to ≤69.4 V during 5.8 A transients, preventing damage to DC-DC controllers and PMICs rated for 75 V absolute maximum. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loop) from ESD and field-wiring faults in factory automation sensors. IC Role / Device Role / Timing Role: Fast-response clamping element between signal line and local ground, placed adjacent to connector. Use Value: Sub-nanosecond response time and <1 μA leakage preserve signal integrity and accuracy while surviving ±8 kV contact ESD per IEC 61000-4-2. |
| Telecom DC Power Interface | Consumer Device USB VBUS Protection |
|
Use Scenario: Guarding PoE-powered equipment inputs against lightning-induced surges on 57 V PSE outputs. IC Role / Device Role / Timing Role: Primary overvoltage clamp on DC input stage, coordinated with upstream fuse and downstream filtering. Use Value: 400 W rating and 69.4 V clamping allow robust protection without derating at elevated ambient temperatures up to 85 °C. |
Use Scenario: Secondary-level surge suppression on USB-C VBUS lines in portable docking stations exposed to hot-plug transients. IC Role / Device Role / Timing Role: Standoff-rated TVS placed after primary protection to handle residual fast-rising edges missed by bulk suppressors. Use Value: 43 V VWM provides margin above 20 V USB PD3.1 extended power range while maintaining low capacitance (<100 pF). |
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-M3/61 | Halogen-free, RoHS-compliant variant with identical electrical specs and package; same thermal and surge ratings. | No functional difference; selected where halogen-free material compliance is mandated (e.g., EU public infrastructure projects). | Choose SMAJ43A-M3/61 when halogen-free bill-of-materials is required; no layout or performance trade-offs. |
| SMAJ43AHE3_A/61 | AEC-Q101 qualified version with enhanced reliability testing (HTOL, TC, UHAST); otherwise identical VWM, VC, and PPPM. | Required for automotive OEM designs needing component-level qualification evidence; not suitable for commercial-only use cases. | Select SMAJ43AHE3_A/61 only for automotive applications requiring AEC-Q101 documentation; adds qualification overhead but no electrical change. |
Compared with SMAJ43A-E3/61, the M3 variant offers halogen-free compliance without altering surge performance, while the HE3 variant adds AEC-Q101 qualification for automotive deployment - neither changes pinout, footprint, or clamping behavior, making them direct material substitutions within their respective compliance scopes.
Availability
SMAJ43A-E3/61 is available at Aetrix Electronics and suitable for automotive power input protection, industrial sensor interface hardening, and telecom DC interface surge suppression requiring stable component supply, consistent tape-and-reel delivery, and full traceability.
Supply support for SMAJ43A-E3/61 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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where robustness against load dump, ESD, and lightning-induced surges is mission-critical.
FAQ
What is the maximum clamping voltage of the SMAJ43A-E3/61 under a 10/1000 μs surge?
The SMAJ43A-E3/61 has a maximum clamping voltage (VC) of 69.4 V at 5.8 A peak pulse current with a 10/1000 μs waveform. This value is measured per standard test conditions (TA = 25 °C, mounted on 0.2" × 0.2" copper pads) and defines the upper voltage limit imposed on protected circuitry during surge events. The SMAJ43A-E3/61 maintains this clamping performance across its specified operating temperature range.
Is the SMAJ43A-E3/61 suitable for automotive applications?
The base SMAJ43A-E3/61 is commercial-grade and RoHS-compliant but not AEC-Q101 qualified. However, Vishay offers the SMAJ43AHE3_A/61 variant - identical in electrical and mechanical specifications - which is fully AEC-Q101 qualified for automotive use. For automotive designs requiring formal qualification evidence, SMAJ43AHE3_A/61 must be specified; the SMAJ43A-E3/61 remains appropriate for non-automotive industrial or telecom applications.
What is the standoff voltage (VWM) of the SMAJ43A-E3/61, and how does it relate to system voltage?
The SMAJ43A-E3/61 has a standoff voltage (VWM) of 43 V, meaning it remains non-conductive up to this reverse voltage under normal operation. This rating provides a 10% margin above a nominal 39 V system or 15% margin above a 48 V nominal rail operating at 90% regulation (43.2 V), ensuring reliable blocking during steady-state conditions while allowing clamping to activate only during overvoltage transients. The SMAJ43A-E3/61 is therefore well-suited for 48 V architectures.
Does the SMAJ43A-E3/61 have polarity marking, and how is it oriented on the PCB?
Yes, the SMAJ43A-E3/61 is unidirectional and features a cathode band marking on the package body. During PCB layout, the banded end must be connected to the line being protected (e.g., 48 V rail), while the anode connects to ground or the return path. Incorrect orientation will prevent proper clamping function and may result in catastrophic failure under surge conditions. The SMAJ43A-E3/61 follows standard DO-214AC polarity conventions used across Vishay's SMAJ family.
What is the thermal resistance and maximum junction temperature of the SMAJ43A-E3/61?
The SMAJ43A-E3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on minimum recommended pad layout (0.2" × 0.2" copper), and a maximum junction temperature (TJ) of +150 °C. These values define its thermal limits under sustained leakage or repeated surge conditions. Derating curves in the datasheet show allowable pulse power reduction above 25 °C ambient, and the SMAJ43A-E3/61 must be applied within these boundaries to ensure long-term reliability.
SMAJ43A-E3/61 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ43A-E3/61 FAQ
1.How can I place an order for SMAJ43A-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ43A-E3/61 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 SMAJ43A-E3/61 reliable?
The price and inventory of SMAJ43A-E3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ43A-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ43A-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ43A-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ43A-E3/61?
SMAJ43A-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ43A-E3/61 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 SMAJ43A-E3/61?
For technical support, including SMAJ43A-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ43A-E3/61 requirements.
6.How does Aetrix verify that SMAJ43A-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ43A-E3/61 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 SMAJ43A-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ43A-E3/61?
All SMAJ43A-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ43A-E3/61, 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 SMAJ43A-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ43A-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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