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Vishay General Semiconductor - Diodes Division SMAJ40A-E3/61
- Part No.:
- SMAJ40A-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ40A-E3/61.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:12,953
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Product details
Overview
SMAJ40A-E3/61 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. 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, and 400 W peak pulse power rating with 10/1000 μs waveform.
For engineers reviewing the SMAJ40A-E3/61 datasheet, SMAJ40A-E3/61 pinout, SMAJ40A-E3/61 application, or SMAJ40A-E3/61 equivalent, this device is selected for robust overvoltage protection on DC power rails and signal lines in automotive ECUs, industrial I/O modules, and telecom interface circuits where fast response (<1 ns), low clamping ratio, and AEC-Q101 qualification are critical.
Technical Context
This TVS diode operates as a shunt-clamping device: under normal conditions it presents high impedance (>1 μA leakage at 40 V), but triggers into low-impedance conduction when transient voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable VBR tolerance and long-term reliability across -55 °C to +150 °C operating junction temperature range.
The device delivers 400 W peak pulse power handling (derated to 300 W above 78 V) with 10/1000 μs waveform, supported by low incremental surge resistance and excellent clamping capability-key for limiting transient energy delivered to downstream ICs like microcontrollers, MOSFET gate drivers, and sensor front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin for 36–40 V DC rails. |
| VBR (min/max) | 44.4 V / 49.1 V at 1 mA - Confirmed breakdown range ensures reliable triggering without premature conduction during normal operation. |
| VC @ IPPM | 64.5 V at 6.2 A - Clamping voltage limits transient overshoot to ≤1.6×VWM, protecting 48 V tolerant components. |
| PPPM | 400 W (10/1000 μs) - Sustains high-energy transients common in automotive load-dump and industrial relay-switching events. |
| ID @ VWM | 1.0 μA - Ultra-low leakage preserves system efficiency and avoids false triggering in high-impedance sensing paths. |
| TJ max. | +150 °C - Enables deployment in under-hood automotive environments and thermally constrained industrial enclosures. |
| Package | SMA (DO-214AC) - Surface-mount footprint compatible with automated assembly; meets MSL Level 1 and J-STD-020 reflow profile. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; polarity indicated by cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode of internal PN junction | Connected to protected circuit's higher-potential node (e.g., VCC rail); clamps positive transients to ground. |
| Anode | Cathode of internal PN junction | Connected to system ground or low-side reference; completes clamping path during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Handles high-energy transients from inductive kickback in automotive solenoid drivers and industrial motor controls. |
| 64.5 V clamping voltage at 6.2 A | Limits voltage stress on downstream 48 V-rated components such as CAN transceivers and power management ICs. |
| Glass passivated chip junction | Ensures stable VBR over time and temperature, critical for long-life deployments in automotive and industrial equipment. |
| AEC-Q101 qualified (via HE3/HM3 variants) | Validated for automotive-grade reliability including temperature cycling, humidity testing, and mechanical shock. |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free SMT assembly without moisture sensitivity concerns or pre-bake requirements. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V power inputs in engine control units (ECUs) and body control modules (BCMs) against ISO 7637-2 pulse 1, 2a, and 5a transients. IC Role / Device Role / Timing Role: Shunt-clamping TVS placed between VBAT and GND to clamp negative-going load dump spikes and positive transients. Use Value: Limits transient voltage to ≤64.5 V, preventing latch-up or permanent damage to MCU power supplies and analog front-ends. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loops) and digital I/O (CAN, RS-485) in factory automation sensors exposed to ESD and cable-induced surges. IC Role / Device Role / Timing Role: Unidirectional TVS connected from signal line to ground, triggered within <1 ns to suppress sub-microsecond transients. Use Value: Maintains signal integrity by clamping surges before they propagate to precision ADCs or isolated communication interfaces. |
| Telecom DC Power Input Protection | Consumer Device USB/DC Jack Protection |
Use Scenario: Securing 48 V DC input ports of PoE-powered network switches and base station radios against lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary TVS stage upstream of DC-DC converters and hot-swap controllers, absorbing bulk surge energy. Use Value: Withstands 400 W pulses without degradation, enabling compliance with IEC 61000-4-5 Level 4 (4 kV/2 Ω) test requirements. |
Use Scenario: Adding transient immunity to 5 V/9 V/12 V DC input jacks in smart home hubs, gaming peripherals, and portable audio devices. IC Role / Device Role / Timing Role: Low-leakage (1 μA) unidirectional TVS placed at jack entry point to block ESD and accidental AC adapter misconnection. Use Value: Prevents field failures caused by human-body-model (HBM) ESD events while avoiding standby current drain in battery-backed systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40A-M3/61 | Halogen-free, RoHS-compliant variant with identical electrical specs and SMA package. | No functional difference; selected when halogen-free material compliance is required per IPC-1752 or EU green directives. | Choose SMAJ40A-M3/61 for environmentally regulated industrial or consumer programs requiring halogen-free bill-of-materials. |
| SMAJ40AHE3_A/H | AEC-Q101 qualified version with same VWM/VBR/VC ratings; differs only in qualification testing and traceability documentation. | Required for automotive OEM Tier-1 supply chains where component-level AEC-Q101 certification is mandatory. | Select SMAJ40AHE3_A/H when deploying in automotive applications subject to OEM PPAP submission and long-term reliability audits. |
Compared with SMAJ40A-M3/61 and SMAJ40AHE3_A/H, the SMAJ40A-E3/61 offers commercial-grade RoHS compliance without halogen restrictions or automotive qualification-making it optimal for cost-sensitive industrial and telecom designs where full AEC-Q101 or halogen-free status is not mandated.
Availability
SMAJ40A-E3/61 is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface protection, telecom DC power input protection, and consumer device USB/DC jack protection requiring stable component supply and consistent tape-and-reel delivery.
Supply support for SMAJ40A-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, power efficiency, and automotive-grade performance.
The SMAJ series is engineered for high-reliability transient suppression in harsh environments-targeting automotive, industrial, and telecom applications where robustness against ESD, lightning, and inductive switching surges is non-negotiable.
FAQ
What is the maximum clamping voltage of the SMAJ40A-E3/61 under specified test conditions?
The SMAJ40A-E3/61 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 and ensures that downstream components rated for up to 65 V will remain within safe operating limits during transient events. The clamping performance is guaranteed across the full operating temperature range of -55 °C to +150 °C.
Is the SMAJ40A-E3/61 suitable for automotive applications?
The SMAJ40A-E3/61 itself is a commercial-grade part and not AEC-Q101 qualified; however, Vishay offers the pin-compatible SMAJ40AHE3_A/H variant which carries full AEC-Q101 qualification. For non-OEM automotive designs where qualification is not contractually required, SMAJ40A-E3/61 may be used-but SMAJ40AHE3_A/H must be selected for Tier-1 automotive production to meet PPAP and reliability audit requirements.
What is the thermal resistance and power dissipation capability of the SMAJ40A-E3/61?
The SMAJ40A-E3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and a steady-state power dissipation (PD) rating of 3.3 W at TA = 50 °C on an infinite heatsink. In practical PCB layouts with 0.2" × 0.2" copper pads per terminal, derating curves show usable power handling drops to ~1.5 W at 85 °C ambient-sufficient for intermittent surge duty but not continuous DC dissipation.
How does the SMAJ40A-E3/61 differ from bidirectional TVS diodes like SMAJ40CA?
The SMAJ40A-E3/61 is unidirectional and functions only against positive transients on its cathode terminal relative to anode (ground), whereas SMAJ40CA is bidirectional and clamps both polarities symmetrically. SMAJ40A-E3/61 exhibits lower leakage (<1 μA at 40 V) and is preferred for DC power rail protection; SMAJ40CA suits AC-coupled signal lines or floating buses where polarity reversal occurs.
What packaging and reel configuration is supplied for the SMAJ40A-E3/61?
The SMAJ40A-E3/61 is supplied in 7-inch diameter plastic tape-and-reel format (package code /61) with 1800 units per reel. The tape conforms to EIA-481 standards, and the device is mounted in standard orientation with cathode band visible for automated optical inspection. Lead finish is matte tin, compliant with J-STD-002 and JESD 22-B102 solderability requirements.
SMAJ40A-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):
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ40A-E3/61 FAQ
1.How can I place an order for SMAJ40A-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ40A-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 SMAJ40A-E3/61 reliable?
The price and inventory of SMAJ40A-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 SMAJ40A-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ40A-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ40A-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ40A-E3/61?
SMAJ40A-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ40A-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 SMAJ40A-E3/61?
For technical support, including SMAJ40A-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ40A-E3/61 requirements.
6.How does Aetrix verify that SMAJ40A-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ40A-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 SMAJ40A-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ40A-E3/61?
All SMAJ40A-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ40A-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 SMAJ40A-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ40A-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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