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Vishay General Semiconductor - Diodes Division SMAJ40AHM3_A/H
- Part No.:
- SMAJ40AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ40AHM3_A/H.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,118
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Product details
Overview
SMAJ40AHM3_A/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features a 40 V stand-off 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 power supplies.
For engineers reviewing the SMAJ40AHM3_A/H datasheet, SMAJ40AHM3_A/H pinout, SMAJ40AHM3_A/H application, or SMAJ40AHM3_A/H equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification (via HM3 suffix), 150 °C max junction temperature, low incremental surge resistance, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a clamping device that remains high-impedance below VWM (40 V) and rapidly transitions to low-impedance conduction above VBR (min 44.4 V) to limit transient overvoltage. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and fast response time (<1.0 ps).
Rated for 400 W peak pulse power (derated to 300 W above 78 V), it handles 6.2 A IPPM under 10/1000 μs waveform with thermal resistance RθJA = 120 °C/W and RθJL = 30 °C/W - enabling reliable operation in compact PCB layouts without forced cooling when mounted per recommended pad dimensions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 44.4 V / 49.1 V at 1 mA - precise breakdown threshold defining turn-on sensitivity |
| VC @ IPPM | 64.5 V at 6.2 A - clamped voltage during worst-case 10/1000 μs surge, limiting downstream stress |
| PPPM | 400 W - peak transient energy absorption capability with standard lightning/surge waveform |
| ID @ VWM | ≤1.0 μA - ultra-low leakage preserves signal integrity and battery life in always-on circuits |
| TJ max. | +150 °C - supports under-hood automotive and high-temperature industrial environments |
| Package | SMA (DO-214AC) - industry-standard 2-pin SMD footprint compatible with JEDEC MS-013 |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, cathode-banded unidirectional configuration. Dimensions: 4.93 mm × 2.92 mm × 2.29 mm (L × W × H); matte tin-plated leads, MSL Level 1, reflow-compatible up to 260 °C peak.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (unidirectional) | Connected to protected line's lower-potential side (e.g., GND or return path) |
| Cathode | Reverse-biased terminal (marked by band) | Connected to protected line's higher-potential side (e.g., VCC or signal rail) |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock |
| 400 W peak pulse power (10/1000 μs) | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth) without degradation |
| Glass passivated junction | Ensures stable VBR tolerance (±5 %), low leakage, and long-term parameter stability over 10+ years |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage overshoot during fast transients, protecting 3.3 V/5 V/12 V logic and analog inputs |
| Halogen-free & RoHS-compliant (HM3) | Meets IPC-1752A material declaration requirements and EU ELV Directive for end-of-life recycling |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: 12 V battery-supplied ECUs exposed to load dump (ISO 7637-2 Pulse 5a, up to 60 V/100 ms). IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and GND to clamp overvoltage before it reaches LDOs and microcontrollers. Use Value: Limits peak voltage to ≤64.5 V, preventing latch-up or gate oxide damage in downstream 40 V-rated FETs and PMICs. |
Use Scenario: 4–20 mA current loop transmitters interfacing with PLC analog inputs in factory automation. IC Role / Device Role / Timing Role: TVS installed across loop terminals to suppress ESD (IEC 61000-4-2 ±8 kV contact) and inductive kickback from solenoid drivers. Use Value: Sub-μA leakage avoids current loop error; 6.2 A surge handling prevents failure during 200 V/1 Ω surge testing. |
| Consumer USB Power Input Protection | Telecom DC Feeder Line Protection |
|
Use Scenario: USB-C PD input stage in portable medical devices requiring robust 5–20 V input surge immunity. IC Role / Device Role / Timing Role: Primary clamping device upstream of buck converter, oriented anode-to-GND, cathode-to-VIN. Use Value: Clamps 1 kV EFT (IEC 61000-4-4) transients to <65 V within <1 ns, preserving USB PD controller communication integrity. |
Use Scenario: -48 V DC feeder lines in telecom base station remote radio units subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Paired unidirectional TVS on positive feed line (cathode to +48 V) and negative feed line (anode to -48 V) for bipolar protection. Use Value: Withstands 10/1000 μs 100 A surges per Telcordia GR-1089-CORE, maintaining <100 V clamping across full operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40AHE3_A/H | Same electrical specs; RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification | Approved for commercial/industrial use only; not certified for automotive under-hood deployment | Select when halogen-free requirement or automotive qualification is not mandated |
| SMBJ40A-HM3 | Higher 600 W PPPM rating; SMB (DO-214AA) package - 25 % larger footprint and 20 % higher RθJA (145 °C/W) | Better surge margin for infrequent high-energy events; requires larger PCB area and thermal relief | Choose when system-level surge testing exceeds IEC 61000-4-5 Level 4 or layout allows larger package |
Compared with SMAJ40AHE3_A/H, SMAJ40AHM3_A/H adds halogen-free construction and AEC-Q101 validation without sacrificing clamping performance; versus SMBJ40A-HM3, it trades peak power headroom for space-constrained designs where 400 W suffices and thermal budget is tight.
Availability
SMAJ40AHM3_A/H is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, consumer USB power systems, and telecom DC feeder protection requiring stable component supply and long-term lifecycle support.
Supply support for SMAJ40AHM3_A/H 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 delivers standardized, high-reliability TVS diodes optimized for cost-sensitive, high-volume automotive and industrial surge protection - balancing clamping precision, surge robustness, and SMT manufacturability.
FAQ
What is the clamping voltage of SMAJ40AHM3_A/H at its rated peak pulse current?
The SMAJ40AHM3_A/H has a maximum clamping voltage (VC) of 64.5 V at 6.2 A peak pulse current (IPPM), measured under the standard 10/1000 μs double-exponential surge waveform. This value ensures protected circuitry sees no more than 64.5 V during transient events, making SMAJ40AHM3_A/H suitable for safeguarding 40 V-rated components such as automotive gate drivers and industrial power controllers.
Is SMAJ40AHM3_A/H qualified for automotive applications?
Yes, SMAJ40AHM3_A/H is AEC-Q101 qualified, as confirmed by the "HM3" suffix denoting halogen-free, RoHS-compliant, and automotive-grade validation. It meets stress tests including temperature cycling, high-temperature operating life, and mechanical shock - enabling use in engine control modules, body electronics, and ADAS power domains where reliability under harsh conditions is mandatory.
How does the SMAJ40AHM3_A/H differ from the SMAJ40A-E3 variant?
SMAJ40AHM3_A/H differs from SMAJ40A-E3 in three key ways: it uses halogen-free molding compound (vs. standard RoHS), carries AEC-Q101 qualification (vs. commercial grade only), and employs a different tape-and-reel packaging code ("H" vs. "61"). Electrically and dimensionally, both share identical VWM (40 V), VBR (44.4–49.1 V), VC (64.5 V), and SMA package - but SMAJ40AHM3_A/H is specified for automotive deployment where ESD robustness and material compliance are critical.
What is the maximum operating junction temperature for SMAJ40AHM3_A/H?
The maximum operating junction temperature (TJ max.) for SMAJ40AHM3_A/H is +150 °C, consistent across all SMAJ-A variants. This rating allows sustained operation in under-hood automotive environments and high-ambient industrial enclosures. Derating curves in the datasheet show usable power dissipation decreases linearly above 25 °C ambient, with full 400 W capability maintained only at TA ≤ 25 °C and proper 0.2" × 0.2" copper pad layout.
Can SMAJ40AHM3_A/H be used in bidirectional configurations?
No, SMAJ40AHM3_A/H is strictly unidirectional, indicated by the "A" suffix and cathode band marking. Bidirectional variants carry the "CA" suffix (e.g., SMAJ40CA). Using SMAJ40AHM3_A/H in reverse-biased AC signal paths would result in forward conduction and potential failure. For bidirectional protection, select SMAJ40CA-HM3 or equivalent - which exhibits symmetric clamping in both polarities and no polarity marking.
SMAJ40AHM3_A/H 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ40AHM3_A/H FAQ
1.How can I place an order for SMAJ40AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ40AHM3_A/H 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 SMAJ40AHM3_A/H reliable?
The price and inventory of SMAJ40AHM3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ40AHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ40AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ40AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ40AHM3_A/H?
SMAJ40AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ40AHM3_A/H 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 SMAJ40AHM3_A/H?
For technical support, including SMAJ40AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ40AHM3_A/H requirements.
6.How does Aetrix verify that SMAJ40AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ40AHM3_A/H 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 SMAJ40AHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ40AHM3_A/H?
All SMAJ40AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ40AHM3_A/H, 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 SMAJ40AHM3_A/H part is unused and in its original packaging.
Return procedure for SMAJ40AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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