My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMA5J40A-M3/61
- Part No.:
- SMA5J40A-M3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J40A-M3/61.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,883
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMA5J40A-M3/61 from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for high-energy surge protection on DC power rails and signal lines. It features 40 V stand-off voltage (VWM), 44.4–49.1 V breakdown voltage (VBR), 64.5 V clamping voltage at 7.8 A peak pulse current, and 500 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 SMA5J40A-M3/61 datasheet, SMA5J40A-M3/61 pinout, SMA5J40A-M3/61 application, or SMA5J40A-M3/61 equivalent, key selection criteria include clamping performance under 500 W surges, unidirectional polarity marking, halogen-free RoHS compliance (M3 suffix), and thermal resistance of 80 °C/W junction-to-ambient - critical for board-level ESD and load-dump hardening.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector triggered by reverse-biased avalanche breakdown. Its glass-passivated junction ensures stable VBR tolerance and low leakage (<1.0 μA at 40 V), while the low incremental surge resistance enables rapid energy diversion during transients such as ISO 7637-2 load dump or IEC 61000-4-5 surges.
Designed for surface-mount automated assembly, it meets MSL Level 1 per J-STD-020 (260 °C peak reflow), supports operating junction temperatures up to +150 °C, and delivers consistent clamping behavior across -55 °C to +150 °C ambient range - validated under standardized 10/1000 μs pulse testing per ANSI/IEEE C62.35.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - maximum continuous reverse operating voltage before conduction begins; defines safe DC rail margin for 36–42 V systems. |
| VBR min/max | 44.4 V / 49.1 V at 1 mA - tight breakdown window ensures predictable turn-on without premature leakage or delayed clamping. |
| VC @ IPPM | 64.5 V at 7.8 A - clamping voltage limits downstream component stress during 500 W transient events. |
| PPPM | 500 W (10/1000 μs) - sustains high-energy surges typical of automotive load dump and industrial switching noise. |
| RθJA | 80 °C/W - thermal resistance determines required PCB copper area (0.2" × 0.2" pads per terminal) for reliable power dissipation. |
| Polarity | Unidirectional - cathode marked with band; blocks forward current until VF ≈ 3.5 V at 25 A, enabling DC rail protection only. |
| Compliance | Halogen-free, RoHS-compliant (M3 suffix); MSL Level 1 - qualified for lead-free reflow and high-reliability commercial applications. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode indicated by molded band on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / reverse surge return path | Connected to system ground or low-side reference; carries full surge current during clamping. |
| Cathode | Reverse-biased avalanche node / protected line connection | Connected to protected line (e.g., 40 V supply rail); band-marked end defines polarity for correct orientation. |
Key Features
| Feature | Design Value |
|---|---|
| Low incremental surge resistance | Enables tighter clamping (64.5 V at 7.8 A) versus competitive 500 W TVS devices, reducing voltage overshoot on sensitive loads. |
| Glass passivated chip junction | Ensures long-term VBR stability and <1.0 μA leakage at VWM, critical for battery-backed or low-power standby circuits. |
| MSL Level 1 rating | Supports single-reflow assembly at 260 °C peak without delamination or parametric shift - eliminates rework risk in high-volume SMT lines. |
| Halogen-free & RoHS-compliant (M3) | Fulfills environmental compliance requirements for global industrial and automotive OEM programs without sacrificing surge robustness. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 40 V battery-fed ECUs against ISO 7637-2 load dump pulses (up to 110 V, 400 ms). IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between 40 V rail and chassis ground to clamp transients before they reach MCU power pins. Use Value: Clamps to 64.5 V within nanoseconds, limiting stress on 60 V-rated input regulators and preventing latch-up in downstream logic. | Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) connected to PLC I/O modules exposed to field wiring surges. IC Role / Device Role / Timing Role: TVS mounted at connector entry point to divert induced lightning or inductive-switching transients away from precision ADC front-ends. Use Value: Sub-100 ns response time and 64.5 V clamping prevent saturation or damage to 24–48 V sensor signal conditioning stages. |
| DC-DC Converter Input Protection | Telecom Power Shelf Surge Suppression |
Use Scenario: Securing input stage of isolated 40 V input DC-DC converters in base station power supplies subjected to repetitive line surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp upstream of active rectification and filtering, absorbing energy before it reaches MOSFET switches. Use Value: 500 W peak power rating handles multiple 10/1000 μs surges without degradation, supporting >100,000 surge cycles per MIL-STD-883H Method 3015. | Use Scenario: Front-end protection for 48 V telecom power shelves compliant with GR-1089-CORE lightning surge requirements (10/700 μs, 2 kV). IC Role / Device Role / Timing Role: First-line TVS on distribution bus feeding multiple hot-swap controllers and PMBus-regulated loads. Use Value: 80 °C/W RθJA allows direct mounting on 2 oz copper planes, enabling thermal management without heatsinks in space-constrained shelf designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA5J40A-E3/61 | Same electrical specs; RoHS-compliant but not halogen-free (E3 vs M3) | Acceptable where halogen-free requirement is not mandated (e.g., non-automotive commercial equipment) | Select SMA5J40A-E3/61 if environmental compliance permits standard RoHS without halogen restriction. |
| SMA5J40CA-M3/61 | Bidirectional variant; symmetric VBR (44.4–49.1 V) in both directions; no polarity marking | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN bus) where reverse polarity surges occur | Choose SMA5J40CA-M3/61 only when bidirectional clamping is needed - not a drop-in replacement for unidirectional use. |
Compared with SMA5J40A-E3/61, the M3 suffix adds halogen-free compliance without electrical trade-offs; versus SMA5J40CA-M3/61, the unidirectional configuration provides lower leakage and defined cathode orientation essential for DC rail placement - making SMA5J40A-M3/61 optimal for fixed-polarity 40 V system protection.
Availability
SMA5J40A-M3/61 is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface hardening, and telecom power shelf surge protection requiring stable component supply and halogen-free compliance.
Supply support for SMA5J40A-M3/61 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, TVS, MOSFETs, and optoelectronics with emphasis on reliability, power handling, and automotive qualification.
The SMA5J series is engineered for high-power-density transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where 500 W surge capability and AEC-Q101 readiness (via HE3/HM3 variants) are critical.
FAQ
What is the clamping voltage of the SMA5J40A-M3/61 under maximum rated surge current?
The SMA5J40A-M3/61 clamps to 64.5 V at its peak pulse current of 7.8 A, measured using the standardized 10/1000 μs waveform. This value is guaranteed across the full operating temperature range and defines the maximum voltage seen by downstream components during surge events. The clamping performance is directly tied to its low incremental surge resistance and is validated per ANSI/IEEE C62.35 test conditions.
Is the SMA5J40A-M3/61 suitable for automotive applications?
Yes, the SMA5J40A-M3/61 is halogen-free and RoHS-compliant, and shares the same die and construction as AEC-Q101-qualified variants (e.g., SMA5J40A-HM3_X). While the M3 suffix itself denotes commercial-grade qualification, its thermal, surge, and reliability characteristics - including 150 °C TJ max and MSL Level 1 - align with automotive subsystem requirements when used within validated derating limits.
How does the M3 suffix differ from E3 in SMA5J40A-M3/61?
The M3 suffix indicates halogen-free, RoHS-compliant construction, whereas E3 denotes RoHS-compliant but standard brominated flame-retardant molding compound. Electrically and mechanically, SMA5J40A-M3/61 and SMA5J40A-E3/61 are identical - same VWM, VBR, VC, PPPM, and package dimensions - differing only in material composition to meet stricter environmental mandates like JEDEC J-STD-202.
What is the recommended PCB layout for optimal thermal performance of SMA5J40A-M3/61?
Vishay specifies mounting SMA5J40A-M3/61 on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve the rated 80 °C/W junction-to-ambient thermal resistance. Use internal or external copper planes connected via multiple thermal vias to enhance heat spreading. Avoid narrow traces or isolated pads, as insufficient copper reduces surge endurance and increases junction temperature during repeated transients.
Can SMA5J40A-M3/61 be used in bidirectional signal protection?
No - SMA5J40A-M3/61 is unidirectional and features a cathode band for polarity-sensitive placement. For bidirectional protection (e.g., on AC-coupled data lines), the SMA5J40CA-M3/61 variant must be used instead. Attempting to use SMA5J40A-M3/61 in reverse-biased signal paths risks permanent conduction and failure due to lack of symmetrical breakdown characteristics.
SMA5J40A-M3/61 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- 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):
- 7.8A
- Power - Peak Pulse:
- 500W
- 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)
SMA5J40A-M3/61 FAQ
1.How can I place an order for SMA5J40A-M3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J40A-M3/61 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 SMA5J40A-M3/61 reliable?
The price and inventory of SMA5J40A-M3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA5J40A-M3/61 is usually 5 days.
3.What payment methods are accepted for SMA5J40A-M3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J40A-M3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J40A-M3/61?
SMA5J40A-M3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J40A-M3/61 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 SMA5J40A-M3/61?
For technical support, including SMA5J40A-M3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J40A-M3/61 requirements.
6.How does Aetrix verify that SMA5J40A-M3/61 is sourced from the original manufacturer or authorized distributors?
All SMA5J40A-M3/61 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 SMA5J40A-M3/61 meets industry standards.
7.What is the process for return or replacement of SMA5J40A-M3/61?
All SMA5J40A-M3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J40A-M3/61, 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 SMA5J40A-M3/61 part is unused and in its original packaging.
Return procedure for SMA5J40A-M3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA5J40A-M3/61 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
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 …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
