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Vishay General Semiconductor - Diodes Division SMAJ40CAHE3/5A
- Part No.:
- SMAJ40CAHE3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ40CAHE3/5A.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,051
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Product details
Overview
SMAJ40CAHE3/5A from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection on signal and power lines. It features 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 with 10/1000 μs waveform - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMAJ40CAHE3/5A datasheet, SMAJ40CAHE3/5A pinout, SMAJ40CAHE3/5A application, or SMAJ40CAHE3/5A equivalent, this device is selected for bidirectional surge immunity in AEC-Q101-compliant systems where low clamping voltage, fast response (<1 ns), and MSL Level 1 reflow compatibility are critical design requirements.
Technical Context
This TVS operates symmetrically in both directions due to its bidirectional CA construction, enabling suppression of positive and negative transients without polarity sensitivity. Its glass-passivated junction delivers stable VBR tolerance (±5 %), low incremental surge resistance, and repeatable clamping performance under repetitive 0.01 % duty cycle surges.
The device is rated for TJ = –55 °C to +150 °C operation, with thermal resistance RθJA = 120 °C/W (on 0.2" × 0.2" copper pads) and RθJL = 30 °C/W, supporting reliable thermal management in compact PCB layouts. It meets UL 497B recognition (QVGQ2) and JESD201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before leakage exceeds 1 μA; defines safe working margin below clamping threshold. |
| VBR (min/max) | 44.4 V / 49.1 V at IT = 1 mA - Confirmed breakdown range ensures predictable turn-on during ESD or lightning-induced surges. |
| VC @ IPPM | 64.5 V at 6.2 A - Clamping voltage limits downstream IC stress during 10/1000 μs transients; enables protection of 48 V-rated components. |
| PPPM | 400 W - Peak pulse power handling capability with standard 10/1000 μs waveform; derates to 300 W above 78 V per spec. |
| IFSM | 40 A - Non-repetitive forward surge current rating (8.3 ms half-sine); supports unidirectional surge margin even in bidirectional configuration. |
| TJ max. | +150 °C - Maximum junction temperature rating allows operation in under-hood automotive environments and high-ambient industrial settings. |
| Package | SMA (DO-214AC) - Surface-mount outline with 5.28 mm × 4.50 mm footprint, compatible with automated placement and IPC-7351B land patterns. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, MSL Level 1 (peak reflow 260 °C). Bidirectional construction has no polarity marking; terminals are symmetrical anode/cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | Accepts reverse surge energy during negative transients; connects to protected line or ground return path. |
| Cathode | Transient current entry (positive polarity) | Accepts reverse surge energy during positive transients; forms symmetrical conduction path with anode. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control modules and ADAS sensor interfaces per stress test requirements. |
| 400 W peak pulse power | Withstands IEC 61000-4-5 Level 4 (4 kV surge) on 50 Ω source impedance without degradation when properly mounted. |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes voltage overshoot across protected ICs, reducing risk of latch-up or gate oxide damage in MOSFET drivers. |
| Fast response time < 1 ns | Clamps transients before propagation into sensitive analog front-ends or microcontroller I/O pins. |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free reflow assembly without preconditioning or special handling. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting CAN FD and LIN bus transceivers from load dump and ISO 7637-2 pulses in vehicle body control modules. IC Role / Device Role / Timing Role: Bidirectional shunt clamp placed between signal line and chassis ground to divert surge energy away from transceiver ESD structures. Use Value: Maintains signal integrity during 100 V/500 ms load dump events while limiting clamped voltage to ≤64.5 V - within absolute max rating of TJA1043 and similar transceivers. |
Use Scenario: Safeguarding 24 V digital input channels on programmable logic controller (PLC) modules against field-wiring induced transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp on dry-contact inputs, installed upstream of optocoupler input stage. Use Value: Absorbs 400 W surges without failure, enabling compliance with IEC 61000-4-4 (EFT) and IEC 61000-4-5 (surge) immunity standards up to Level 3. |
| Consumer Power Adapter Protection | Telecom DC Power Line Protection |
|
Use Scenario: Secondary-side overvoltage suppression in USB-C PD adapters exposed to hot-plug and cable discharge events. IC Role / Device Role / Timing Role: Fast-acting TVS across 5–20 V output rails to prevent regulator latch-up and downstream SoC damage. Use Value: Sub-1 ns response captures sub-microsecond ESD events; 40 V VWM provides 20 % margin above 33 V max PD output, avoiding false triggering. |
Use Scenario: DC feed protection in PoE-powered access points and base stations subjected to lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Common-mode clamp on 48 V DC input pair, paired with differential-mode filtering to meet GR-1089-CORE requirements. Use Value: Symmetrical bidirectional clamping ensures equal suppression on both conductors, preserving PoE signature detection and maintaining IEEE 802.3af/at compliance. |
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-M3/5A | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification; same SMA package. | No functional difference; selected when halogen-free material compliance is mandated by OEM environmental policy. | Direct drop-in replacement where halogen-free bill-of-materials is required; no layout or validation change needed. |
| SMBJ40CAHE3/5A | Same VWM, VBR, VC, and AEC-Q101 rating, but in larger SMB (DO-214AA) package with 600 W PPPM. | Higher power handling supports longer-duration surges (e.g., ISO 16750-2 pulse 5a); requires larger PCB footprint. | Choose when system-level surge testing exceeds 400 W or when thermal margin must be increased beyond SMA's 120 °C/W RθJA. |
Compared with SMAJ40CAHE3/5A, the SMAJ40CA-M3/5A offers identical protection performance with halogen-free construction, while SMBJ40CAHE3/5A trades smaller size for higher 600 W surge capacity and lower thermal resistance - enabling use in thermally constrained or higher-energy threat environments.
Availability
SMAJ40CAHE3/5A is available at Aetrix Electronics and suitable for automotive electronics, industrial control systems, and telecom infrastructure requiring stable component supply with AEC-Q101 qualification and full traceability.
Supply support for SMAJ40CAHE3/5A 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, and protection devices with emphasis on reliability, automotive qualification, and high-volume manufacturability.
The SMAJ series is engineered for board-level transient suppression in harsh environments, targeting automotive, industrial, and communications applications where consistent clamping, low leakage, and reflow robustness are mandatory.
FAQ
What is the clamping voltage of SMAJ40CAHE3/5A at its rated peak pulse current?
The SMAJ40CAHE3/5A has a maximum clamping voltage (VC) of 64.5 V at 6.2 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is measured under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream ICs remain within their absolute maximum ratings. The SMAJ40CAHE3/5A achieves this clamping performance while maintaining low dynamic impedance.
Is SMAJ40CAHE3/5A suitable for automotive applications?
Yes, SMAJ40CAHE3/5A is AEC-Q101 qualified and explicitly designated for automotive use with the "HE3" suffix. It meets stress test requirements for temperature cycling, humidity bias, mechanical shock, and surge endurance relevant to engine control units, body electronics, and ADAS sensor modules. Its bidirectional architecture and 150 °C junction rating make SMAJ40CAHE3/5A appropriate for under-hood and cabin-mounted systems.
How does the bidirectional design of SMAJ40CAHE3/5A affect its circuit implementation?
The bidirectional design of SMAJ40CAHE3/5A eliminates polarity concerns during PCB layout - it can be placed across any two nodes requiring symmetrical overvoltage protection without regard to anode/cathode orientation. This simplifies routing in differential interfaces (e.g., RS-485, CAN) and reduces BOM complexity versus using two unidirectional devices. SMAJ40CAHE3/5A conducts equally for positive and negative transients, delivering matched clamping in both directions.
What is the standoff voltage (VWM) of SMAJ40CAHE3/5A, and why is it important?
The standoff voltage (VWM) of SMAJ40CAHE3/5A is 40 V - the maximum DC or continuous reverse voltage the device blocks without exceeding 1 μA leakage current. This parameter establishes the operational margin below clamping onset and ensures the SMAJ40CAHE3/5A remains non-conductive during normal system operation. Selecting VWM ≥ 1.1× nominal line voltage prevents nuisance conduction while retaining sufficient headroom for transients.
Does SMAJ40CAHE3/5A require special PCB layout considerations?
Yes - for optimal surge performance, SMAJ40CAHE3/5A should be mounted on minimum recommended pad layout: 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, per Vishay specification. This minimizes trace inductance and improves heat dissipation, directly affecting clamping voltage and power derating. Short, direct traces to protected node and ground plane are essential; long leads increase VC during fast transients. SMAJ40CAHE3/5A's SMA package supports standard SMT reflow profiles including lead-free 260 °C peak.
SMAJ40CAHE3/5A 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:
- -
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ40CAHE3/5A FAQ
1.How can I place an order for SMAJ40CAHE3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ40CAHE3/5A 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 SMAJ40CAHE3/5A reliable?
The price and inventory of SMAJ40CAHE3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ40CAHE3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ40CAHE3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ40CAHE3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ40CAHE3/5A?
SMAJ40CAHE3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ40CAHE3/5A 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 SMAJ40CAHE3/5A?
For technical support, including SMAJ40CAHE3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ40CAHE3/5A requirements.
6.How does Aetrix verify that SMAJ40CAHE3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ40CAHE3/5A 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 SMAJ40CAHE3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ40CAHE3/5A?
All SMAJ40CAHE3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ40CAHE3/5A, 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 SMAJ40CAHE3/5A part is unused and in its original packaging.
Return procedure for SMAJ40CAHE3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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