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Vishay General Semiconductor - Diodes Division SMAJ40AHE3/61
- Part No.:
- SMAJ40AHE3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ40AHE3/61.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,989
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Product details
Overview
SMAJ40AHE3/61 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 40 V standoff voltage (VWM), 44.4–49.1 V breakdown voltage (VBR) at 1 mA, 64.5 V maximum clamping voltage (VC) at 6.2 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial power supplies.
For engineers reviewing the SMAJ40AHE3/61 datasheet, SMAJ40AHE3/61 pinout, SMAJ40AHE3/61 application, or SMAJ40AHE3/61 equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, 150 °C max junction temperature, low incremental surge resistance, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a clamping device that enters avalanche conduction when reverse voltage exceeds its breakdown threshold, diverting transient energy away from protected circuitry. Its glass-passivated junction ensures stable leakage performance and fast response time (<1 ns), while the SMA package supports high thermal dissipation via low RθJL (30 °C/W).
The device is rated for non-repetitive 8.3 ms half-sine surge current up to 40 A (IFSM), and derates linearly above 25 °C ambient per Fig. 2. It meets MSL Level 1 per J-STD-020 and is qualified to AEC-Q101 for automotive underhood applications requiring robust ESD and load-dump immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 40 V - Maximum continuous reverse operating voltage before significant leakage; defines safe operating margin below clamping onset. |
| VBR (Breakdown Voltage) | 44.4–49.1 V at 1 mA - Confirmed avalanche initiation range; ensures reliable turn-on during transients without premature conduction. |
| VC (Clamping Voltage) | 64.5 V at 6.2 A IPPM - Peak voltage seen by protected circuit during 10/1000 μs surge; determines minimum required voltage headroom for downstream devices. |
| PPPM (Peak Pulse Power) | 400 W (10/1000 μs) - Energy-handling capacity under standard lightning surge waveform; sufficient for ISO 7637-2 Pulse 1 & 2b protection. |
| ID (Reverse Leakage) | 1.0 μA at 40 V - Ultra-low leakage preserves signal integrity and minimizes standby power loss in always-on circuits. |
| TJ max | 150 °C - Enables operation in under-hood automotive environments and industrial enclosures without derating at full power. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with cathode band marking; compatible with JEDEC-standard reflow profiles and J-STD-002 solderability. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; polarity indicated by cathode band on unidirectional types.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-impedance return path; completes clamping loop during transient events. |
| Cathode | High-side connection point | Connected to protected line (e.g., 40 V rail or signal trace); blocks normal operation but conducts during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive underhood use including temperature cycling, humidity bias, and mechanical shock per stress test requirements. |
| 400 W peak pulse power | Handles ISO 7637-2 Pulse 1 (inductive switch-off) and Pulse 2b (load dump simulation) without degradation in single-event mode. |
| Glass passivated junction | Ensures stable VBR tolerance and low leakage drift over lifetime and temperature; critical for long-term reliability in industrial controls. |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow without baking; simplifies manufacturing for high-volume SMT assembly lines. |
| Low clamping ratio (VC/VBR ≈ 1.36) | Minimizes overvoltage overshoot during clamping, reducing stress on downstream MOSFET gates and logic inputs. |
Applications
| Automotive Power Distribution | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 40 V battery-fed ECUs from load dump transients during alternator regulation failure. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and input stage of DC-DC converter or LDO regulator. Use Value: Clamps surges up to 64.5 V within nanoseconds, preventing latch-up or gate oxide rupture in upstream power management ICs. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure or temperature transducers) from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance TVS mounted directly at connector entry point before signal conditioning amplifier. Use Value: Sub-μA leakage preserves mV-level signal accuracy; fast response prevents amplifier saturation during ±8 kV contact ESD. |
| Telecom DC Power Input | Consumer Device USB Power Rail |
|
Use Scenario: Safeguarding PoE-powered equipment inputs against induced surges from nearby AC wiring or lightning coupling. IC Role / Device Role / Timing Role: Primary clamping device on 48 V DC input before isolation transformer or hot-swap controller. Use Value: Withstands repetitive 10/1000 μs pulses up to 400 W, meeting IEC 61000-4-5 Level 3 immunity requirements. |
Use Scenario: Preventing damage to USB-C PD controllers and port protection ICs during accidental 20 V adapter misconnection. IC Role / Device Role / Timing Role: Standoff-rated TVS on VBUS line to absorb overvoltage before internal FETs or voltage monitors. Use Value: 40 V VWM provides margin above 20 V PD profile while 64.5 V VC avoids triggering internal OVP thresholds prematurely. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40AE3/61 | Commercial-grade version without AEC-Q101 qualification; identical electrical specs and package. | Limited to non-automotive industrial or consumer applications where automotive reliability certification is not required. | Select SMAJ40AE3/61 for cost-sensitive designs where AEC-Q101 is unnecessary and RoHS compliance suffices. |
| SMAJ43AHE3/61 | Higher VWM (43 V) and VBR (47.8–52.8 V); same 400 W PPPM and SMA package. | Better suited for 42 V nominal systems (e.g., dual-battery architectures) where tighter clamping margin is needed above 40 V rail. | Choose SMAJ43AHE3/61 when protecting circuits referenced to 42–43 V rails to avoid false triggering near nominal voltage. |
Compared with SMAJ40AE3/61 and SMAJ43AHE3/61, the SMAJ40AHE3/61 uniquely balances AEC-Q101 qualification with precise 40 V standoff - making it optimal for automotive 12 V/40 V hybrid systems requiring certified reliability without over-specifying clamping voltage.
Availability
SMAJ40AHE3/61 is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface protection, telecom DC input stages, and consumer USB power rail designs requiring stable component supply and long-term lifecycle support.
Supply support for SMAJ40AHE3/61 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 automotive-grade validation.
The SMAJ series is engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness against load dump, ESD, and inductive switching surges is mandatory.
FAQ
What is the clamping voltage of SMAJ40AHE3/61 at its rated peak pulse current?
The SMAJ40AHE3/61 has a maximum clamping voltage (VC) of 64.5 V at 6.2 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and reflects the worst-case voltage imposed on protected circuitry during surge events - critical for ensuring downstream components remain within absolute maximum ratings.
Is SMAJ40AHE3/61 suitable for automotive applications?
Yes, SMAJ40AHE3/61 is AEC-Q101 qualified and explicitly designated for automotive use with suffix "HE3". It undergoes stress testing for temperature cycling, humidity bias, and mechanical shock, and is rated for operation from –55 °C to +150 °C - making it appropriate for engine control units, body electronics, and ADAS power domains where load dump and ESD immunity are essential.
How does the SMAJ40AHE3/61 differ from the SMAJ40AE3/61 variant?
The SMAJ40AHE3/61 differs from SMAJ40AE3/61 solely in qualification status: HE3 denotes AEC-Q101 qualification and automotive-grade screening, while E3 is commercial-grade only. All electrical parameters (VWM, VBR, VC, PPPM), package (SMA), and thermal characteristics are identical between the two variants.
What is the maximum reverse leakage current for SMAJ40AHE3/61 at its standoff voltage?
The SMAJ40AHE3/61 exhibits a maximum reverse leakage current (ID) of 1.0 μA at its 40 V standoff voltage (VWM), measured at 25 °C. This ultra-low leakage ensures minimal impact on precision analog circuits and battery-powered systems where quiescent current must be tightly controlled.
Can SMAJ40AHE3/61 be used in bidirectional configurations?
No, SMAJ40AHE3/61 is a unidirectional TVS diode, indicated by the "A" suffix and cathode band marking. For bidirectional operation, the "CA" suffix (e.g., SMAJ40CAHE3/61) must be selected - which provides symmetrical clamping in both polarities and no polarity marking on the package.
SMAJ40AHE3/61 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):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 6.2A
- 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)
SMAJ40AHE3/61 FAQ
1.How can I place an order for SMAJ40AHE3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ40AHE3/61 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 SMAJ40AHE3/61 reliable?
The price and inventory of SMAJ40AHE3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ40AHE3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ40AHE3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ40AHE3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ40AHE3/61?
SMAJ40AHE3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ40AHE3/61 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 SMAJ40AHE3/61?
For technical support, including SMAJ40AHE3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ40AHE3/61 requirements.
6.How does Aetrix verify that SMAJ40AHE3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ40AHE3/61 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 SMAJ40AHE3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ40AHE3/61?
All SMAJ40AHE3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ40AHE3/61, 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 SMAJ40AHE3/61 part is unused and in its original packaging.
Return procedure for SMAJ40AHE3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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