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Vishay General Semiconductor - Diodes Division SMAJ40A-E3/5A
- Part No.:
- SMAJ40A-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ40A-E3/5A.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,190
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Product details
Overview
SMAJ40A-E3/5A from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection of sensitive electronics. It features a 40 V standoff voltage (VWM), 44.4–49.1 V breakdown voltage (VBR) at 1 mA, and clamps transients to ≤64.5 V at 6.2 A peak pulse current (IPPM) under 10/1000 μs waveform - deployed on power rails and signal lines in automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMAJ40A-E3/5A datasheet, SMAJ40A-E3/5A pinout, SMAJ40A-E3/5A application, or SMAJ40A-E3/5A equivalent, key selection criteria include its 400 W peak pulse power rating (≤78 V), low 0.101 %/°C VBR temperature coefficient, SMA (DO-214AC) package compatibility with automated SMT assembly, and AEC-Q101 qualification eligibility via HE3/HM3 variants.
Technical Context
This unidirectional TVS diode operates as a clamping device that remains high-impedance below 40 V and rapidly transitions to low-impedance conduction above its 44.4–49.1 V breakdown threshold. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and fast response time (<1.0 ns), enabling suppression of ESD, lightning-induced surges, and inductive switching spikes.
Thermal performance is defined by RθJA = 120 °C/W (on standard 0.2" × 0.2" copper pads) and maximum junction temperature of +150 °C. The device sustains 40 A non-repetitive forward surge current (8.3 ms half-sine) and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak tolerance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working range. |
| VBR @ IT = 1 mA | 44.4–49.1 V - Measured breakdown voltage range confirming reliable turn-on margin above VWM. |
| VC @ IPPM = 6.2 A | ≤64.5 V - Clamped voltage during 10/1000 μs surge; determines protected circuit's maximum transient exposure. |
| PPPM | 400 W - Peak pulse power handling capability (≤78 V); enables protection against IEC 61000-4-5 Level 4 surges. |
| IFSM | 40 A - Single half-sine surge current rating (8.3 ms); supports inrush and fault-current resilience in power stages. |
| TJ max. | +150 °C - Maximum junction temperature; allows operation in under-hood automotive and industrial ambient environments. |
| RθJA | 120 °C/W - Thermal resistance junction-to-ambient on standard PCB pad layout; informs derating requirements above 25 °C. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Polarity indicated by cathode band; anode and cathode terminals are axially aligned along the body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connected to protected line; conducts surge current to ground when VLINE exceeds VBR. |
| Anode | Reference/return path | Typically tied to system ground or lower-potential rail; completes clamping path during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables compliance with IEC 61000-4-5 surge immunity up to 4 kV (line-earth) in compact SMA footprint. |
| Glass passivated junction | Ensures stable VBR and low leakage (<1.0 μA) across temperature and lifetime, critical for battery-powered sensors. |
| MSL Level 1, 260 °C peak reflow | Supports lead-free reflow without preconditioning; eliminates moisture-related popcorning risk in high-volume SMT lines. |
| AEC-Q101 qualification option | HE3/HM3 suffix variants meet automotive reliability standards for engine control, ADAS, and body electronics. |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast-rising transients (e.g., ISO 7637-2 pulse 1/2a), improving IC survivability. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V supply inputs in engine control units (ECUs) against load dump and alternator transients per ISO 16750-2. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between battery rail and LDO/regulator input. Use Value: Limits transient voltage to ≤64.5 V, preventing damage to downstream 40 V-rated regulators and microcontrollers. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) in factory-floor pressure/temperature sensors from ESD and cable-coupled noise. IC Role / Device Role / Timing Role: Low-capacitance TVS mounted directly at connector interface to shunt fast transients before signal conditioning stage. Use Value: Sub-1 ns response and <1.0 μA leakage preserve signal integrity and measurement accuracy in precision 16-bit ADC systems. |
| Consumer Device USB Port Protection | Telecom Base Station DC Feeder Protection |
Use Scenario: Safeguarding VBUS and D+/D− lines in USB-C power delivery circuits against hot-plug and ESD events (IEC 61000-4-2 ±15 kV air). IC Role / Device Role / Timing Role: Discrete TVS array (dual-channel variant) placed upstream of USB controller and power switch. Use Value: 400 W rating absorbs multiple ESD strikes without degradation; RoHS-compliant E3 finish ensures consumer product compliance. |
Use Scenario: Protecting -48 V DC power feeds in 4G/5G remote radio units (RRUs) from lightning-induced surges entering via outdoor cabling. IC Role / Device Role / Timing Role: Primary clamping device on DC input stage, coordinated with gas discharge tube (GDT) for staged protection. Use Value: 40 A IFSM withstands sustained overcurrents; 150 °C TJ max supports operation in sealed, high-temperature enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40CA-E3/5A | Bidirectional variant with same VWM (40 V), VBR (44.4–49.1 V), and VC (≤64.5 V), but symmetrical clamping in both polarities. | Required where AC-coupled or floating signal lines (e.g., RS-485, CAN bus) need protection against bipolar transients. | Select SMAJ40CA-E3/5A only if bidirectional clamping is mandated; unidirectional SMAJ40A-E3/5A offers lower cost and simpler grounding for DC rails. |
| SMBJ40A-E3/52 | Same electrical specs but in larger SMB (DO-214AA) package; 600 W PPPM rating (vs. 400 W), higher IPPM (9.6 A), and lower RθJA (80 °C/W). | Better suited for high-energy surge environments (e.g., industrial motor drives) where thermal margin and energy absorption exceed SMA limits. | Choose SMBJ40A-E3/52 when PCB space permits and surge energy exceeds 400 W; SMAJ40A-E3/5A remains optimal for space-constrained automotive modules. |
Compared with SMAJ40CA-E3/5A, the SMAJ40A-E3/5A provides polarity-specific clamping essential for DC power rails, while SMBJ40A-E3/52 delivers superior thermal and surge-handling headroom at the cost of footprint size - making SMAJ40A-E3/5A the balanced choice for volume automotive and industrial SMT designs requiring proven reliability in DO-214AC.
Availability
SMAJ40A-E3/5A is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom power feeders requiring stable component supply, RoHS compliance, and consistent tape-and-reel delivery for SMT production.
Supply support for SMAJ40A-E3/5A 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, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-speed transient suppression in harsh environments - targeting automotive, industrial, and communications systems where robustness, small footprint, and AEC-Q101 readiness are mandatory.
FAQ
What is the clamping voltage of the SMAJ40A-E3/5A under a 10/1000 μs surge?
The SMAJ40A-E3/5A clamps to a maximum of 64.5 V when subjected to its rated peak pulse current of 6.2 A using the standardized 10/1000 μs waveform. This value is measured at TA = 25 °C and reflects worst-case voltage seen by downstream circuitry during surge events - critical for ensuring protected ICs remain within absolute maximum ratings.
Is the SMAJ40A-E3/5A RoHS-compliant and halogen-free?
Yes, the SMAJ40A-E3/5A carries the "E3" suffix, indicating it is RoHS-compliant per EU Directive 2011/65/EU and manufactured without intentionally added halogens. It meets Vishay's material categorization standard per document 99912 and is suitable for consumer, industrial, and automotive applications requiring green compliance.
Does the SMAJ40A-E3/5A have AEC-Q101 qualification?
The base SMAJ40A-E3/5A is commercial-grade and not AEC-Q101 qualified; however, Vishay offers the functionally identical SMAJ40AHE3_A variant (with HE3 suffix) that is fully AEC-Q101 qualified for automotive use. Both share identical electrical specs and SMA package, differing only in test documentation and traceability.
What is the maximum operating temperature for the SMAJ40A-E3/5A?
The SMAJ40A-E3/5A has a maximum junction temperature (TJ) of +150 °C and an operating junction/storage temperature range of -55 °C to +150 °C. This enables deployment in under-hood automotive locations and industrial enclosures where ambient temperatures exceed 100 °C, provided thermal design accounts for RθJA = 120 °C/W.
How does the SMAJ40A-E3/5A differ from the SMAJ40CA-E3/5A?
The SMAJ40A-E3/5A is unidirectional, with a cathode band marking and clamping action only for positive transients relative to ground; the SMAJ40CA-E3/5A is bidirectional, offering symmetrical clamping for both polarities - essential for AC signals or floating buses like CAN or RS-485. Their VWM, VBR, and VC values are identical, but polarity behavior differs fundamentally.
SMAJ40A-E3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- 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-E3/5A FAQ
1.How can I place an order for SMAJ40A-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ40A-E3/5A 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 SMAJ40A-E3/5A reliable?
The price and inventory of SMAJ40A-E3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ40A-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ40A-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ40A-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ40A-E3/5A?
SMAJ40A-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ40A-E3/5A 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 SMAJ40A-E3/5A?
For technical support, including SMAJ40A-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ40A-E3/5A requirements.
6.How does Aetrix verify that SMAJ40A-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ40A-E3/5A 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 SMAJ40A-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ40A-E3/5A?
All SMAJ40A-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ40A-E3/5A, 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 SMAJ40A-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ40A-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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