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Vishay General Semiconductor - Diodes Division SMAJ40CA-E3/5A
- Part No.:
- SMAJ40CA-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ40CA-E3/5A.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,000
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Product details
Overview
SMAJ40CA-E3/5A from Vishay General Semiconductor is a bidirectional surface-mount 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 (IPPM), and 400 W peak pulse power (10/1000 μs waveform), targeting protection of MOSFETs, ICs, and sensor interfaces in automotive and industrial systems.
For engineers reviewing the SMAJ40CA-E3/5A datasheet, SMAJ40CA-E3/5A pinout, SMAJ40CA-E3/5A application, or SMAJ40CA-E3/5A equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VWM ≈ 1.61), MSL Level 1 moisture sensitivity, RoHS-compliant matte tin plating, and AEC-Q101 qualification availability via HE3 suffix variants.
Technical Context
This TVS diode operates symmetrically in both directions due to its CA (bidirectional) configuration, enabling suppression of positive and negative transients without polarity constraints. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ns), while low incremental surge resistance supports effective energy diversion during ESD or lightning-induced surges.
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) on standard 5.0 mm × 5.0 mm copper pads. It meets UL 497B recognition and complies with ANSI/IEEE C62.35 surge standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR min/max | 44.4 V / 49.1 V at 1 mA - Confirmed breakdown range ensuring reliable turn-on under transient stress. |
| VC @ IPPM | 64.5 V at 6.2 A - Clamped voltage during 10/1000 μs surge; determines protected circuit's maximum overvoltage exposure. |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - Peak surge energy handling capacity; defines survivability against repetitive transients. |
| ID @ VWM | 1.0 μA - Reverse leakage at standoff voltage; ensures minimal power loss and signal integrity in standby. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive or high-ambient industrial environments. |
| Package | SMA (DO-214AC) - Surface-mount outline with 5.28 mm length, 4.50 mm width, and 2.29 mm height; compatible with automated placement. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, MSL Level 1 compliant, UL 94 V-0 rated compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Terminal 1 (cathode band side) | Bidirectional symmetry means no functional anode/cathode distinction; terminals are interchangeable for transient suppression. |
| Cathode | Terminal 2 (opposite cathode band) | No polarity marking on CA devices; both terminals behave identically under reverse or forward surge conditions. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without external polarity management. |
| 400 W peak pulse power (10/1000 μs) | Handles high-energy transients from inductive switching or EFT events common in motor drives and power supplies. |
| Low clamping ratio (VC/VWM = 1.61) | Minimizes overvoltage stress on downstream ICs compared to higher-ratio suppressors, improving system robustness. |
| MSL Level 1, 260 °C reflow compatible | Supports standard lead-free SMT assembly without pre-baking or special handling requirements. |
| AEC-Q101 qualified option (HE3/HM3) | Validated for automotive applications including engine control units and ADAS sensor interfaces. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional TVS placed across differential or single-ended signal lines to clamp ±100 V transients within nanoseconds. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V interface ICs while maintaining signal fidelity during normal operation. |
Use Scenario: Safeguarding digital input/output channels in programmable logic controllers exposed to relay coil flyback and ESD in factory automation. IC Role / Device Role / Timing Role: Standoff-connected TVS shunting surge energy away from microcontroller GPIOs and optocoupler drivers. Use Value: Eliminates need for discrete RC snubbers or additional isolation components, reducing BOM count and board space. |
| Consumer Power Adapter Input | Telecom Line Interface |
Use Scenario: Secondary-side overvoltage suppression in AC/DC adapters subjected to lightning-induced surges on DC output rails. IC Role / Device Role / Timing Role: Parallel-connected TVS limiting output voltage spikes to <65 V during 10/1000 μs transients. Use Value: Ensures compliance with IEC 62368-1 secondary circuit insulation requirements without derating primary-side components. |
Use Scenario: Protecting Ethernet PHYs and DSL line drivers from induced surges on twisted-pair telecom lines per ITU-T K.21. IC Role / Device Role / Timing Role: Differential-mode TVS pair suppressing common-mode transients between tip/ring conductors. Use Value: Maintains signal integrity up to 100 MHz while meeting GR-1089-CORE lightning immunity thresholds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40CA-M3/5A | Halogen-free, RoHS-compliant variant with identical electrical specs and package; same thermal and surge ratings. | No difference in circuit function or layout; selected when halogen-free compliance is mandated by OEM environmental policy. | Choose SMAJ40CA-M3/5A if halogen-free materials are required for final product certification. |
| SMAJ43CA-E3/5A | Higher VWM (43 V), VBR (47.8–52.8 V), and VC (69.4 V); same 400 W PPPM rating and SMA package. | Better suited for 48 V nominal systems where 40 V VWM risks false triggering during normal ripple or tolerance drift. | Choose SMAJ40CA-E3/5A for 36 V nominal circuits; select SMAJ43CA-E3/5A for 48 V rail protection with added margin. |
Compared with SMAJ40CA-M3/5A, the E3/5A offers standard RoHS compliance without halogen restrictions; versus SMAJ43CA-E3/5A, it provides tighter clamping headroom for lower-voltage rails but less margin against sustained overvoltage conditions.
Availability
SMAJ40CA-E3/5A is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and consumer power adapter designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SMAJ40CA-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, precision, and application-specific validation.
The SMAJ series targets board-level transient protection across automotive, industrial, and telecom markets, engineered for high surge robustness, low clamping voltage, and seamless integration into automated SMT lines.
FAQ
What is the clamping voltage of SMAJ40CA-E3/5A at its rated peak pulse current?
The SMAJ40CA-E3/5A 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 defines the upper voltage limit imposed on protected circuitry during surge events. The clamping performance remains consistent across both polarities due to its bidirectional design, making SMAJ40CA-E3/5A suitable for protecting balanced or floating signal paths where polarity cannot be assumed.
Is SMAJ40CA-E3/5A suitable for automotive applications?
SMAJ40CA-E3/5A itself is commercial-grade, but Vishay offers AEC-Q101 qualified versions under the HE3 and HM3 suffixes (e.g., SMAJ40CAHE3_A/I). These variants undergo stress testing for temperature cycling, humidity, and mechanical shock per automotive qualification standards. For non-automotive use, SMAJ40CA-E3/5A delivers full electrical performance in industrial and consumer systems; for automotive deployment, specify the HE3/HM3 variant to ensure compliance with OEM reliability requirements.
What is the thermal resistance of SMAJ40CA-E3/5A, and how does it affect PCB layout?
The SMAJ40CA-E3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes minimum recommended pad layout per Vishay's DO-214AC footprint. To maintain safe junction temperatures during repetitive surges, designers must provide adequate copper area and avoid excessive trace length or thermal bottlenecks. The device's RθJL of 30 °C/W indicates efficient heat transfer to PCB leads, supporting reliable operation up to +150 °C junction temperature.
Does SMAJ40CA-E3/5A have polarity markings, and how is it installed on the PCB?
No - SMAJ40CA-E3/5A is a bidirectional TVS diode and carries no cathode band or polarity marking. Both terminals are functionally identical, allowing installation in either orientation on the PCB. This simplifies layout and eliminates risk of reverse placement errors during automated assembly. Unlike unidirectional SMAJ variants (e.g., SMAJ40A), the CA version suppresses transients equally in both directions, making it ideal for AC-coupled lines, differential buses, or any application where voltage polarity is undefined or alternating.
How does the 400 W peak pulse power rating of SMAJ40CA-E3/5A scale with ambient temperature?
The 400 W peak pulse power rating of SMAJ40CA-E3/5A applies at TA = 25 °C and derates linearly above that temperature per Figure 2 in Vishay document 88390. At 75 °C ambient, the usable PPPM drops to approximately 280 W; at 125 °C, it falls to ~160 W. This derating is critical for high-temperature environments like under-hood automotive or enclosed industrial enclosures. Designers must verify worst-case ambient plus self-heating to ensure the device remains within its safe operating area during surge events, especially with repetitive pulse duty cycles.
SMAJ40CA-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:
- -
- 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-E3/5A FAQ
1.How can I place an order for SMAJ40CA-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ40CA-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 SMAJ40CA-E3/5A reliable?
The price and inventory of SMAJ40CA-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 SMAJ40CA-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ40CA-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ40CA-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ40CA-E3/5A?
SMAJ40CA-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ40CA-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 SMAJ40CA-E3/5A?
For technical support, including SMAJ40CA-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ40CA-E3/5A requirements.
6.How does Aetrix verify that SMAJ40CA-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ40CA-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 SMAJ40CA-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ40CA-E3/5A?
All SMAJ40CA-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ40CA-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 SMAJ40CA-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ40CA-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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