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Vishay General Semiconductor - Diodes Division SMAJ40CA-E3/61
- Part No.:
- SMAJ40CA-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ40CA-E3/61.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,645
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Product details
Overview
SMAJ40CA-E3/61 from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on signal or power lines. It features a 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 (10/1000 μs waveform), commonly deployed to protect MOSFET gates, sensor interfaces, and automotive ECUs against ESD and inductive switching surges.
For engineers reviewing the SMAJ40CA-E3/61 datasheet, SMAJ40CA-E3/61 pinout, SMAJ40CA-E3/61 application, or SMAJ40CA-E3/61 equivalent, key selection criteria include bidirectional clamping capability, 150 °C max junction temperature, MSL Level 1 moisture sensitivity, RoHS-compliant matte tin plating, and compatibility with automated SMT placement on standard 0.2" × 0.2" copper pads.
Technical Context
This bidirectional TVS diode operates symmetrically across both polarities, delivering consistent clamping performance without polarity dependence. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 μA at VWM), while the low incremental surge resistance enables rapid energy diversion during transient events.
The device is rated for 400 W peak pulse power up to 78 V and derates to 300 W above that threshold, with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead). It meets AEC-Q101 qualification when ordered with HE3/HM3 suffixes, though SMAJ40CA-E3/61 is commercial-grade RoHS-compliant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before significant conduction begins |
| VBR (min/max) | 44.4 V / 49.1 V at 1 mA - Ensures reliable triggering above system operating voltage with margin |
| VC @ IPPM | 64.5 V at 6.2 A - Clamped voltage seen by protected circuit during 10/1000 μs surge |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - Peak transient energy absorption capacity under standardized waveform |
| IFSM | 40 A - Single half-sine surge current rating (8.3 ms), relevant for unidirectional variants only; not applicable to SMAJ40CA |
| TJ max | +150 °C - Enables operation in under-hood automotive or industrial environments with elevated ambient temps |
| Package | SMA (DO-214AC) - Surface-mount footprint compatible with IPC-7351B standard, 0.208" × 0.157" body size |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads; no polarity marking for bidirectional types; terminals solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (positive polarity) | One terminal of symmetrical PN junction; conducts during positive overvoltage events |
| Cathode | Transient current entry (negative polarity) | Second terminal of symmetrical PN junction; conducts during negative overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| 400 W peak pulse power (10/1000 μs) | Handles typical ISO 7637-2 pulse 1/2/5a surges in 12 V automotive systems |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes voltage overshoot during transients, reducing stress on downstream ICs |
| MSL Level 1 (260 °C peak reflow) | Supports standard lead-free reflow profiles without preconditioning or baking |
| Glass passivated junction | Ensures long-term stability of breakdown voltage and leakage current over temperature and life |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Protects LIN bus transceivers and microcontroller I/O pins from load dump and inductive kickback in door modules and lighting controls. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between LIN line and ground, responding within <1 ns to transients exceeding 40 V. Use Value: Prevents latch-up or permanent damage to 5 V tolerant transceivers during 100 V/50 ms load dump events per ISO 16750-2. |
Use Scenario: Shields 4–20 mA current loop receivers and ADC front-ends from ESD and field wiring surges in factory automation sensors. IC Role / Device Role / Timing Role: Low-capacitance TVS placed across differential input pins of instrumentation amplifiers or isolated analog front-ends. Use Value: Maintains signal integrity with <1.0 μA leakage at 40 V, avoiding offset drift in precision current measurement circuits. |
| Consumer USB-C Port Protection | Telecom DSL Line Interface |
Use Scenario: Safeguards USB-C CC and VCONN lines against human-body-model (HBM) ESD and hot-plug transients in portable devices. IC Role / Device Role / Timing Role: Bidirectional clamp mounted directly at connector, with minimal trace length to reduce inductance. Use Value: Withstands ±15 kV HBM per IEC 61000-4-2 due to fast response and low dynamic impedance below 1 Ω. |
Use Scenario: Suppresses lightning-induced surges and AC power cross-talk on twisted-pair DSL lines entering residential gateways. IC Role / Device Role / Timing Role: Primary protection device placed before hybrid transformer and line driver ICs in ADSL/VDSL front-end. Use Value: 400 W rating handles 10/700 μs telecom surges (IEC 61000-4-5) without degradation after repeated strikes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40A-E3/61 | Unidirectional; cathode band marked; VF = 3.5 V at 25 A forward current | Requires correct polarity orientation; unsuitable for AC or floating lines | Select only when protecting DC-biased lines where polarity is fixed and forward conduction must be minimized |
| SMBJ40CA-E3/52 | Same VWM/VC, but SMB (DO-214AA) package; 600 W PPPM; larger footprint (0.260" × 0.177") | Higher power handling; requires more PCB area; better thermal dissipation on large pads | Choose when surge threat exceeds 400 W or board layout allows larger package for improved reliability margin |
Compared with SMAJ40CA-E3/61, the unidirectional SMAJ40A-E3/61 offers lower forward voltage but mandates strict polarity alignment, while the SMBJ40CA-E3/52 provides 50 % higher surge power at the cost of PCB real estate-making SMAJ40CA-E3/61 optimal for space-constrained, polarity-agnostic protection in consumer and industrial designs.
Availability
SMAJ40CA-E3/61 is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, consumer USB-C port protection, and telecom line interface applications requiring stable component supply, full traceability, and RoHS compliance.
Supply support for SMAJ40CA-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 qualification.
The SMAJ series is engineered for robust transient suppression in harsh environments, targeting design-in across automotive, industrial, and communications infrastructure where compact, high-power TVS performance is critical.
FAQ
What is the maximum clamping voltage of SMAJ40CA-E3/61 at its rated peak pulse current?
The SMAJ40CA-E3/61 has a maximum clamping voltage (VC) of 64.5 V at its specified peak pulse current (IPPM) of 6.2 A under the 10/1000 μs waveform. This value is measured per JEDEC standards and guarantees the protected circuit will not experience voltages exceeding 64.5 V during such transient events, making SMAJ40CA-E3/61 suitable for safeguarding 48 V nominal systems and 5 V/3.3 V logic interfaces with appropriate margin.
Is SMAJ40CA-E3/61 suitable for automotive applications requiring AEC-Q101 qualification?
No-SMAJ40CA-E3/61 carries the E3 suffix, indicating RoHS-compliant commercial grade. For AEC-Q101 qualification, the part must be ordered as SMAJ40CAHE3_A or SMAJ40CAHM3_A (halogen-free), which include additional stress testing and traceability. The SMAJ40CA-E3/61 itself is not AEC-Q101 qualified, though it shares identical electrical specs and package with qualified variants.
What is the thermal resistance of SMAJ40CA-E3/61, and how does it affect PCB layout?
SMAJ40CA-E3/61 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 near its 150 °C max junction temperature, PCB layout must use minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. Reducing pad size increases RθJA, risking thermal runaway during repetitive surges-so SMAJ40CA-E3/61 layout adherence is critical for sustained reliability.
How does the bidirectional nature of SMAJ40CA-E3/61 impact its use in signal line protection?
The bidirectional configuration of SMAJ40CA-E3/61 allows it to clamp overvoltages of either polarity symmetrically, eliminating the need for polarity awareness during placement. This makes SMAJ40CA-E3/61 ideal for protecting AC-coupled data lines (e.g., RS-485, CAN, USB D+/D−), floating sensor outputs, or any interface where voltage reversals occur-unlike unidirectional variants that would conduct destructively if reverse-biased beyond VWM.
What is the leakage current specification for SMAJ40CA-E3/61 at its standoff voltage?
At its 40 V standoff voltage (VWM), SMAJ40CA-E3/61 exhibits a maximum reverse leakage current (ID) of 1.0 μA at 25 °C. This ultra-low leakage ensures minimal loading on high-impedance signal paths-such as those found in precision analog sensors or battery-powered IoT nodes-where even nanoamp-level currents could degrade accuracy or battery life. Leakage remains under 5 μA up to 85 °C per datasheet characterization.
SMAJ40CA-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:
- -
- Bidirectional Channels:
- 1
- 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)
SMAJ40CA-E3/61 FAQ
1.How can I place an order for SMAJ40CA-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ40CA-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 SMAJ40CA-E3/61 reliable?
The price and inventory of SMAJ40CA-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 SMAJ40CA-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ40CA-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ40CA-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ40CA-E3/61?
SMAJ40CA-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ40CA-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 SMAJ40CA-E3/61?
For technical support, including SMAJ40CA-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ40CA-E3/61 requirements.
6.How does Aetrix verify that SMAJ40CA-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ40CA-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 SMAJ40CA-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ40CA-E3/61?
All SMAJ40CA-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ40CA-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 SMAJ40CA-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ40CA-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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