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Vishay General Semiconductor - Diodes Division SMAJ40CAHE3/61
- Part No.:
- SMAJ40CAHE3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ40CAHE3/61.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,726
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Product details
Overview
SMAJ40CAHE3/61 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, and 400 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial systems.
For engineers reviewing the SMAJ40CAHE3/61 datasheet, SMAJ40CAHE3/61 pinout, SMAJ40CAHE3/61 application, or SMAJ40CAHE3/61 equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 150 °C junction temperature rating, low incremental surge resistance, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This device operates as a voltage-clamping protector in bidirectional mode, with symmetrical reverse/forward conduction behavior and no polarity marking. Its glass-passivated junction enables fast response (<1 ns) to ESD and lightning-induced surges while maintaining stable leakage (<1.0 μA at VWM) across -55 °C to +150 °C operating range.
The SMAJ40CAHE3/61 delivers 400 W peak pulse power up to 78 V, derating to 300 W above that threshold, and exhibits 0.101 %/°C temperature coefficient of VBR - ensuring predictable clamping performance under thermal stress in engine control units and power supply rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - maximum continuous reverse stand-off voltage before significant leakage begins; defines safe operating margin below clamping threshold |
| VBR min/max | 44.4 V / 49.1 V at 1 mA - guaranteed breakdown range ensures reliable turn-on during transient events without premature conduction |
| VC @ IPPM | 64.5 V at 6.2 A - clamping voltage under 10/1000 μs surge; limits downstream voltage stress to protected circuitry |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - peak pulse power handling per JEDEC standard; determines survivability against repetitive transients |
| ID @ VWM | ≤1.0 μA - ultra-low reverse leakage preserves signal integrity and minimizes standby power loss in high-impedance circuits |
| TJ max. | +150 °C - extended junction temperature rating supports under-hood automotive and industrial environments |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness per AEC specification |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; meets UL 94 V-0 flammability rating and MSL Level 1 (peak reflow 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; symmetrical with cathode in bidirectional operation | No polarity marking required; terminals are functionally identical for transient suppression in either direction |
| Cathode | Current exit terminal in forward bias; symmetrical with anode in bidirectional operation | Same physical terminal as anode; bidirectional conduction eliminates need for orientation-aware PCB layout |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity constraints |
| 400 W peak pulse power (10/1000 μs) | Withstands high-energy transients from inductive switching or EFT bursts in automotive power nets |
| AEC-Q101 qualified | Validated for automotive electronics including body control modules and ADAS sensor interfaces |
| Low profile SMA package | Reduces board space and enables high-density routing in compact ECUs and IoT edge nodes |
| Glass passivated junction | Ensures stable VBR and low leakage over lifetime, even under humidity and thermal cycling stress |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed microcontroller power rails from load dump and alternator ripple. IC Role / Device Role / Timing Role: Voltage clamping element placed between VCC and GND to limit transient excursions to ≤64.5 V. Use Value: Prevents latch-up or permanent damage to MCU and CAN transceivers during ISO 7637-2 Pulse 5a events. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) from ESD and cable discharge events. IC Role / Device Role / Timing Role: Bidirectional shunt clamp across signal pair to divert surge energy before reaching ADC input stage. Use Value: Maintains measurement accuracy by limiting voltage excursion to <65 V, well below typical op-amp absolute max ratings. |
| Consumer Device USB Port Protection | Telecom Line Card Surge Suppression |
Use Scenario: Safeguarding USB 2.0 D+/D− lines against human-body-model ESD (±8 kV contact). IC Role / Device Role / Timing Role: Low-capacitance TVS placed directly at connector to absorb sub-nanosecond ESD pulses. Use Value: Clamps transients within 1 ns while adding <0.5 pF parasitic capacitance - preserving signal integrity up to 480 Mbps. |
Use Scenario: Protecting Ethernet PHY interface pins from lightning-induced surges on outdoor telecom links. IC Role / Device Role / Timing Role: Primary-level TVS on line-side transformer secondary to limit common-mode voltage spikes. Use Value: Handles 400 W surges per IEC 61000-4-5 Level 4, enabling compliance with GR-1089-CORE requirements. |
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-M3/61 | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification | No difference in circuit design or layout; differs only in material composition for environmental compliance | Select when halogen-free bill-of-materials is mandated by OEM or regional regulatory requirement |
| SMBJ40CAHE3/61 | Higher 600 W peak pulse power rating; larger SMB (DO-214AA) package with 150 °C TJ rating | Requires larger PCB pad area and higher thermal mass; suited for higher-energy surge environments | Choose when system-level surge testing exceeds 400 W or when board layout allows larger footprint |
Compared with SMAJ40CAHE3/61, the SMAJ40CA-M3/61 offers identical protection performance with halogen-free construction, while the SMBJ40CAHE3/61 provides 50 % higher pulse power handling at the cost of increased board area and thermal inertia - enabling trade-offs between density, compliance, and ruggedness.
Availability
SMAJ40CAHE3/61 is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, consumer USB interfaces, and telecom line cards requiring stable component supply with AEC-Q101 assurance and long-term production continuity.
Supply support for SMAJ40CAHE3/61 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, efficiency, and application-specific optimization.
The SMAJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and communications systems where failure due to voltage surges must be eliminated.
FAQ
What is the clamping voltage of SMAJ40CAHE3/61 at its rated peak pulse current?
The SMAJ40CAHE3/61 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 JEDEC test conditions and guarantees that downstream components experience no more than 64.5 V during a defined surge event, making it suitable for protecting 48 V nominal systems and 3.3 V/5 V logic interfaces via appropriate series impedance.
Is SMAJ40CAHE3/61 suitable for automotive applications?
Yes, SMAJ40CAHE3/61 is AEC-Q101 qualified and explicitly designated for automotive use with the "HE3" suffix. It undergoes rigorous stress testing including temperature cycling, highly accelerated life testing (HALT), and ESD validation - meeting requirements for engine control units, body electronics, and ADAS sensor modules where reliability under thermal and electrical stress is critical.
How does the bidirectional configuration of SMAJ40CAHE3/61 affect PCB layout?
The SMAJ40CAHE3/61 has no polarity marking and functions identically in both directions, eliminating orientation constraints during placement. This simplifies PCB layout for AC-coupled signals, differential buses, or floating grounds - no silkscreen polarity indicator is needed, and the device can be placed in either direction without functional impact or risk of misassembly.
What is the thermal resistance of SMAJ40CAHE3/61, and how does it influence power dissipation?
The SMAJ40CAHE3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead (RθJL) of 30 °C/W. When mounted on the recommended 0.2" × 0.2" copper pads, it sustains 3.3 W continuous power dissipation at TA = 50 °C. These values inform heatsinking decisions and derating curves - especially important in enclosed automotive enclosures where ambient temperature may exceed 85 °C.
Does SMAJ40CAHE3/61 meet RoHS and lead-free assembly requirements?
Yes, SMAJ40CAHE3/61 is RoHS-compliant and compatible with lead-free reflow soldering profiles up to 260 °C peak temperature (MSL Level 1). The matte tin-plated leads meet J-STD-002 and JESD 22-B102 solderability standards, and whisker resistance is certified to JESD 201 Class 2 - ensuring long-term reliability in high-volume automated assembly lines.
SMAJ40CAHE3/61 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- 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)
SMAJ40CAHE3/61 FAQ
1.How can I place an order for SMAJ40CAHE3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ40CAHE3/61 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 SMAJ40CAHE3/61 reliable?
The price and inventory of SMAJ40CAHE3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ40CAHE3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ40CAHE3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ40CAHE3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ40CAHE3/61?
SMAJ40CAHE3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ40CAHE3/61 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 SMAJ40CAHE3/61?
For technical support, including SMAJ40CAHE3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ40CAHE3/61 requirements.
6.How does Aetrix verify that SMAJ40CAHE3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ40CAHE3/61 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 SMAJ40CAHE3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ40CAHE3/61?
All SMAJ40CAHE3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ40CAHE3/61, 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 SMAJ40CAHE3/61 part is unused and in its original packaging.
Return procedure for SMAJ40CAHE3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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