My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMAJ40A-M3/5A
- Part No.:
- SMAJ40A-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ40A-M3/5A.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,206
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ40A-M3/5A from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. 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.
For engineers reviewing the SMAJ40A-M3/5A datasheet, SMAJ40A-M3/5A pinout, SMAJ40A-M3/5A application, or SMAJ40A-M3/5A equivalent, key selection considerations include its unidirectional polarity, 1.0 μA max reverse leakage at VWM, -55 °C to +150 °C operating junction temperature range, and halogen-free, RoHS-compliant M3 suffix construction suitable for automotive-grade designs when paired with AEC-Q101 qualified variants.
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 breakdown characteristics and fast response time (<1 ps), while the SMA package supports automated placement and meets MSL level 1 per J-STD-020.
The device delivers 400 W peak pulse power (derated to 300 W above 78 V) under 10/1000 μs waveform conditions, with thermal resistance of 120 °C/W (junction-to-ambient) and 30 °C/W (junction-to-lead), enabling reliable surge handling on standard PCB copper pads (0.2" × 0.2") without heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse working voltage before clamping begins |
| VBR (min/max) | 44.4 V / 49.1 V at 1 mA - Confirmed breakdown threshold defining turn-on precision |
| VC @ IPPM | 64.5 V at 6.2 A - Clamped voltage during 400 W transient, limiting downstream stress |
| IPPM | 6.2 A - Peak surge current capability with 10/1000 μs waveform |
| PPPM | 400 W - Transient energy absorption capacity, derated above 78 V |
| TJ Range | -55 °C to +150 °C - Full industrial/automotive temperature operation without derating loss |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with cathode band marking |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, MSL Level 1, 260 °C reflow peak.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode-side connection in unidirectional configuration | Reverse-biased terminal accepting transient energy; must connect toward protected line |
| Anode (non-banded end) | Ground/reference return path | Low-impedance path to system ground or common reference during clamping event |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power | Enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 40 V rails |
| Glass passivated junction | Ensures stable VBR tolerance and long-term reliability under repeated surge stress |
| Halogen-free, RoHS-compliant (M3) | Meets environmental compliance requirements for automotive and industrial end equipment |
| MSL Level 1 rating | Supports standard SMT reflow without moisture sensitivity concerns or baking |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving clamping accuracy |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs and body control modules from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp positive-going surges. Use Value: Withstands 400 W pulses and maintains VC ≤ 64.5 V, preventing damage to downstream PMICs and microcontrollers. | Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and cable discharge events in factory automation systems. IC Role / Device Role / Timing Role: Low-capacitance TVS connected across signal and ground lines to absorb sub-100 ns transients. Use Value: 1.0 μA leakage at 40 V ensures minimal impact on sensor biasing and measurement accuracy. |
| Telecom DC Power Input Protection | Consumer Power Adapter Output Protection |
Use Scenario: Safeguarding PoE-powered devices (e.g., IP cameras, access points) against surges on 48 V DC input lines. IC Role / Device Role / Timing Role: Primary clamping device on DC input before DC-DC converter stage. Use Value: 64.5 V clamping voltage provides safe margin below typical 57 V PoE+ OVP thresholds. | Use Scenario: Adding secondary surge immunity to USB-C PD adapter 20 V output rails after primary regulation. IC Role / Device Role / Timing Role: Final-stage TVS on regulated output to suppress coupling from nearby switching noise or connector hot-plug events. Use Value: SMA package enables compact layout near output connector, minimizing trace inductance and clamping overshoot. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40A-E3/5A | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs M3) | Commercial-grade only; lacks halogen-free certification required for some automotive OEMs | Select E3 for cost-sensitive non-automotive applications where halogen content is unrestricted |
| SMAJ43A-M3/5A | Higher VWM (43 V), VBR min 47.8 V, VC 69.4 V at 5.8 A | Better suited for 42–45 V nominal systems; slightly reduced surge current handling | Choose SMAJ43A-M3/5A when protecting higher-voltage rails where tighter VWM margin is needed |
Compared with SMAJ40A-E3/5A, the SMAJ40A-M3/5A offers identical clamping performance with halogen-free compliance for stricter environmental programs; versus SMAJ43A-M3/5A, it provides lower clamping voltage (64.5 V vs 69.4 V) and higher surge current (6.2 A vs 5.8 A) at the expense of 3 V lower stand-off margin.
Availability
SMAJ40A-M3/5A is available at Aetrix Electronics and suitable for automotive power line protection, industrial sensor interface protection, telecom DC power input protection requiring stable component supply, consistent halogen-free compliance, and AEC-Q101-ready qualification path.
Supply support for SMAJ40A-M3/5A 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, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom infrastructure where robustness against lightning, ESD, and inductive switching surges is critical.
FAQ
What is the maximum clamping voltage of the SMAJ40A-M3/5A under standard test conditions?
The SMAJ40A-M3/5A has a maximum clamping voltage (VC) of 64.5 V at 6.2 A peak pulse current (IPPM) using the 10/1000 μs waveform. This value is measured per JEDEC standards and defines the upper voltage limit imposed on protected circuitry during a surge event. The SMAJ40A-M3/5A maintains this clamping performance across its full operating temperature range.
Does the SMAJ40A-M3/5A meet AEC-Q101 qualification requirements?
The SMAJ40A-M3/5A itself is not AEC-Q101 qualified; however, Vishay offers AEC-Q101 versions under ordering codes SMAJ40AHM3_X (halogen-free, RoHS-compliant, and AEC-Q101 qualified). The "_X" denotes revision code (e.g., A, B), and qualification applies only to those specific part numbers-not the base SMAJ40A-M3/5A. Always verify the full ordering code for automotive qualification status.
What is the reverse leakage current specification for the SMAJ40A-M3/5A at its rated stand-off voltage?
The SMAJ40A-M3/5A exhibits a maximum reverse leakage current (ID) of 1.0 μA at its rated stand-off voltage (VWM) of 40 V and ambient temperature of 25 °C. This low leakage ensures minimal power loss and no measurable impact on bias networks in precision analog or low-power sensor circuits. Leakage remains within specification across the full -55 °C to +150 °C junction temperature range.
How does the SMAJ40A-M3/5A differ from bidirectional variants like SMAJ40CA?
The SMAJ40A-M3/5A is unidirectional and features a cathode band marking; it conducts only in reverse bias above VBR. In contrast, SMAJ40CA is bidirectional with symmetrical clamping in both polarities and no polarity marking. The SMAJ40A-M3/5A is intended for DC rail protection where polarity is fixed, whereas SMAJ40CA suits AC-coupled or floating signal lines. Electrical parameters (VWM, VC, PPPM) are otherwise matched.
What PCB pad layout is recommended for optimal thermal and surge performance of the SMAJ40A-M3/5A?
Vishay specifies a minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pad area per terminal for the SMAJ40A-M3/5A to achieve its rated 400 W peak pulse power. These pads improve heat dissipation and reduce thermal impedance during surge events. The SMA (DO-214AC) footprint must follow Vishay's published outline dimensions, including 0.074" maximum height and 0.208" maximum length, to ensure mechanical reliability and solder joint integrity.
SMAJ40A-M3/5A 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:
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ40A-M3/5A FAQ
1.How can I place an order for SMAJ40A-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ40A-M3/5A 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 SMAJ40A-M3/5A reliable?
The price and inventory of SMAJ40A-M3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ40A-M3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ40A-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ40A-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ40A-M3/5A?
SMAJ40A-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ40A-M3/5A 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 SMAJ40A-M3/5A?
For technical support, including SMAJ40A-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ40A-M3/5A requirements.
6.How does Aetrix verify that SMAJ40A-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ40A-M3/5A 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 SMAJ40A-M3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ40A-M3/5A?
All SMAJ40A-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ40A-M3/5A, 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 SMAJ40A-M3/5A part is unused and in its original packaging.
Return procedure for SMAJ40A-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ40A-M3/5A Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
