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Vishay General Semiconductor - Diodes Division SMAJ40AHE3/5A
- Part No.:
- SMAJ40AHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ40AHE3/5A.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,861
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Product details
Overview
SMAJ40AHE3/5A 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 40 V stand-off 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 (IPPM), 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 SMAJ40AHE3/5A datasheet, SMAJ40AHE3/5A pinout, SMAJ40AHE3/5A application, or SMAJ40AHE3/5A 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 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a clamping device in reverse-biased configuration, activating when transient voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable avalanche characteristics, while the SMA package provides thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead).
The device meets J-STD-020 MSL Level 1 (peak reflow 260 °C), supports 40 A non-repetitive forward surge current (IFSM), and exhibits a positive temperature coefficient of VBR (+0.101 %/°C), enabling predictable voltage drift across operating temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 44.4 V / 49.1 V at 1 mA - Confirmed avalanche onset range under standardized test conditions |
| VC @ IPPM | 64.5 V at 6.2 A - Clamped voltage during 10/1000 μs transient, limiting downstream stress |
| PPPM | 400 W - Peak transient energy absorption capability with defined waveform |
| ID @ VWM | 1.0 μA - Low leakage ensures minimal standby power loss in high-impedance circuits |
| TJ max | +150 °C - Enables operation in under-hood automotive and industrial environments |
| AEC-Q101 | Qualified - Validated for automotive electronics reliability per stress test requirements |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, matte tin-plated leads, RoHS-compliant and AEC-Q101 qualified. 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 avalanche current to ground during overvoltage event |
| Anode (unbanded end) | Reference node | Typically tied to system ground or lower-potential rail to complete clamping path |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power | Supports robust protection against IEC 61000-4-5 Level 3/4 surges without derating below 78 V |
| Glass passivated junction | Ensures consistent avalanche behavior and long-term stability under repetitive transient stress |
| MSL Level 1 rating | Enables single-pass reflow assembly without moisture-related popcorning risk |
| Low profile SMA package | Reduces board space and parasitic inductance vs. through-hole alternatives like DO-15 |
| AEC-Q101 qualification | Validates suitability for automotive powertrain, body control, and ADAS subsystems |
Applications
| Automotive Power Supply Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp spikes above 40 V. Use Value: Limits voltage to ≤64.5 V during 6.2 A transients, preventing damage to 45 V-rated DC-DC controllers and microcontrollers. | Use Scenario: Safeguarding analog outputs of pressure/temperature sensors connected to PLC I/O modules. IC Role / Device Role / Timing Role: TVS mounted at connector entry point to shunt ESD and inductive kickback from field wiring. Use Value: Sub-1 ns response time and 1.0 μA leakage preserve signal integrity and minimize offset error in 24-bit ADC front-ends. |
| Consumer Device USB Port Protection | Telecom Line Card Surge Suppression |
Use Scenario: Secondary-level protection on VBUS line of USB-C ports in portable monitors and docking stations. IC Role / Device Role / Timing Role: Standoff-rated TVS upstream of polyfuse and load switch to absorb hot-swap overshoot and contact bounce. Use Value: 40 V VWM avoids false triggering during 5 V ±10 % regulation; 64.5 V VC prevents latch-up in USB PD controllers. | Use Scenario: Front-end protection on -48 V telecom power feeds exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Unidirectional TVS configured cathode-to-rail to clamp negative-going transients on supply input. Use Value: 400 W rating handles 10/1000 μs surges up to 6.2 A; AEC-Q101 qualification supports extended field life in outdoor cabinets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40AE3/5A | Same electrical specs but commercial-grade (non-AEC-Q101); RoHS-compliant, no halogen restriction | Lacks automotive qualification; suitable for consumer/industrial use where AEC compliance not mandated | Select SMAJ40AE3/5A for cost-sensitive non-automotive designs requiring identical clamping performance |
| SMAJ43AHE3/5A | Higher VWM (43 V), VBR (47.8–52.8 V), and VC (69.4 V); same package and AEC-Q101 rating | Better suited for 48 V systems or designs needing higher margin above nominal rail | Choose SMAJ43AHE3/5A when protecting 48 V power rails where 40 V VWM would cause excessive leakage or premature conduction |
Compared with SMAJ40AHE3/5A, SMAJ40AE3/5A offers identical clamping but lacks automotive qualification, while SMAJ43AHE3/5A raises the protection threshold for higher-voltage rails - both require review of system VWM margin and transient amplitude profiles before substitution.
Availability
SMAJ40AHE3/5A is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface design, and telecom line card development requiring stable component supply and AEC-Q101 traceability.
Supply support for SMAJ40AHE3/5A 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 and application-specific performance.
The SMAJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where robustness, low leakage, and fast response are critical.
FAQ
What is the maximum clamping voltage of the SMAJ40AHE3/5A under standard test conditions?
The SMAJ40AHE3/5A has a maximum clamping voltage (VC) of 64.5 V at 6.2 A peak pulse current with a 10/1000 μs waveform. This value is measured per IEC 61000-4-5 guidelines and defines the upper voltage limit imposed on protected circuitry during transient events. The SMAJ40AHE3/5A maintains this clamping performance across its full operating temperature range.
Is SMAJ40AHE3/5A suitable for automotive applications?
Yes, SMAJ40AHE3/5A is AEC-Q101 qualified and specifically designated for automotive use via the "HE3" suffix. It undergoes stress testing for temperature cycling, humidity, mechanical shock, and high-temperature operating life per AEC standards. The SMAJ40AHE3/5A is deployed in engine control units, body electronics, and infotainment power rails where transient immunity is required.
What is the thermal resistance of SMAJ40AHE3/5A and how does it affect PCB layout?
The SMAJ40AHE3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead (RθJL) of 30 °C/W. To maintain safe operation at full 400 W pulse rating, the datasheet specifies mounting on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. Reducing pad area increases thermal impedance and requires derating of peak power - the SMAJ40AHE3/5A must be laid out per Vishay's recommended footprint.
Does SMAJ40AHE3/5A have polarity markings, and how is it oriented in-circuit?
Yes, SMAJ40AHE3/5A is unidirectional and marked with a cathode band at one end. During PCB layout, the banded end (cathode) connects to the line being protected (e.g., +12 V rail), while the unbanded end (anode) connects to ground. Reversing orientation renders the device ineffective for overvoltage suppression - correct polarity is essential for proper operation of the SMAJ40AHE3/5A.
What is the leakage current specification for SMAJ40AHE3/5A at its rated stand-off voltage?
The SMAJ40AHE3/5A exhibits a maximum reverse leakage current (ID) of 1.0 μA at its 40 V stand-off voltage (VWM) and 25 °C ambient temperature. This low leakage ensures minimal power loss in always-on circuits and avoids loading sensitive reference nodes. Leakage remains within specification up to 125 °C, supporting reliable operation in thermally demanding environments for the SMAJ40AHE3/5A.
SMAJ40AHE3/5A 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)
SMAJ40AHE3/5A FAQ
1.How can I place an order for SMAJ40AHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ40AHE3/5A 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 SMAJ40AHE3/5A reliable?
The price and inventory of SMAJ40AHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ40AHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ40AHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ40AHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ40AHE3/5A?
SMAJ40AHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ40AHE3/5A 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 SMAJ40AHE3/5A?
For technical support, including SMAJ40AHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ40AHE3/5A requirements.
6.How does Aetrix verify that SMAJ40AHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ40AHE3/5A 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 SMAJ40AHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ40AHE3/5A?
All SMAJ40AHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ40AHE3/5A, 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 SMAJ40AHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ40AHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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