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Vishay General Semiconductor - Diodes Division SMA5J40A-E3/61
- Part No.:
- SMA5J40A-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J40A-E3/61.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,150
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Product details
Overview
SMA5J40A-E3/61 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 a 40 V stand-off voltage (VWM), 44.4–49.1 V breakdown voltage (VBR), 64.5 V clamping voltage (VC) at 7.8 A peak pulse current, and 500 W peak pulse power rating with 10/1000 µs waveform. It is widely used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial power supplies.
For engineers reviewing the SMA5J40A-E3/61 datasheet, SMA5J40A-E3/61 pinout, SMA5J40A-E3/61 application, or SMA5J40A-E3/61 equivalent, key selection criteria include clamping performance under 500 W surge, unidirectional polarity with cathode band marking, RoHS-compliant matte tin terminals, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector, activating when reverse voltage exceeds its VBR threshold to divert transient energy away from downstream components. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 µA at VWM), while low incremental surge resistance enables effective suppression of fast-rising transients from inductive switching or ESD events.
The device is rated for junction temperatures from –55 °C to +150 °C and meets MSL Level 1 per J-STD-020 (260 °C peak reflow). Its thermal resistance (RθJA = 80 °C/W) reflects standard SMA package dissipation capability under recommended pad layout, and it supports unidirectional surge handling up to 40 A IFSM (8.3 ms half-sine).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin. |
| VBR min/max | 44.4 V / 49.1 V - Measured at 1 mA test current; ensures reliable turn-on within specified tolerance band. |
| VC @ IPPM | 64.5 V at 7.8 A - Clamped voltage during 500 W transient; determines maximum stress imposed on protected circuitry. |
| PPPM | 500 W - Peak pulse power handling with 10/1000 µs waveform; quantifies single-event surge energy absorption. |
| ID @ VWM | <1.0 µA - Reverse leakage at stand-off voltage; critical for low-power sensor or battery-backed circuits. |
| TJ max | +150 °C - Maximum junction temperature; sets thermal design limits for sustained operation and surge duty cycle. |
| RθJA | 80 °C/W - Junction-to-ambient thermal resistance on standard 5.0 mm × 5.0 mm pads; guides PCB copper area requirements. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case with matte tin-plated leads. Polarity indicated by cathode band on one end; unidirectional configuration only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path); conducts during forward surge or bias conditions. |
| Cathode | Reverse breakdown terminal | Marked with band; connected to protected line (e.g., 40 V rail); initiates clamping when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Low profile SMA package | Enables compact layout in space-constrained automotive ECUs and industrial controllers without sacrificing surge rating. |
| Glass passivated junction | Ensures long-term stability of VBR and low leakage across temperature and life cycles, critical for mission-critical systems. |
| 500 W peak pulse power | Provides robust protection against ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 3 surges on 24 V/48 V systems. |
| MSL Level 1 rating | Supports lead-free reflow up to 260 °C peak without popcorn cracking or delamination-no floor-life management required. |
| RoHS-compliant (E3 suffix) | Meets global environmental compliance for commercial-grade applications; halogen-free option available via M3 suffix. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 40 V-rated microcontrollers and gate drivers in engine control units subjected to load dump transients. IC Role / Device Role: Unidirectional shunt TVS placed between power rail and ground to clamp spikes above 44.4 V. Use Value: Limits rail voltage to ≤64.5 V during 500 W surges, preventing latch-up or oxide breakdown in downstream ICs. |
Use Scenario: Safeguarding analog front-end inputs of pressure/temperature sensors in factory automation PLC modules. IC Role / Device Role: Standoff protection element on 24 V supply line feeding precision ADCs and op-amps. Use Value: Maintains <1.0 µA leakage at 40 V, avoiding signal offset errors while suppressing ESD and switching noise. |
| DC-DC Converter Input Protection | Telecom Line Card Surge Suppression |
Use Scenario: Input-side transient suppression for isolated 48 V to 5 V buck converters in base station power supplies. IC Role / Device Role: Primary overvoltage clamp ahead of primary-side controller IC and MOSFET switch. Use Value: Withstands 40 A IFSM surge current, enabling reliable operation during repeated inductive turn-off events. |
Use Scenario: Secondary-side protection on 40 V bias rails powering optical transceivers in telecom line cards. IC Role / Device Role: Fast-response (sub-nanosecond) voltage limiter guarding laser driver ICs from lightning-induced surges. Use Value: Achieves 64.5 V clamping at 7.8 A with low Rsurge, minimizing let-through energy to sensitive RF components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ40A | Same SMA package, 40 V VWM, but 43.3–47.9 V VBR range and 64.5 V VC at 7.5 A; slightly tighter VBR tolerance. | Identical use in automotive and industrial DC rails; validated in Littelfuse's AEC-Q200 test reports. | Select SMAJ40A if tighter VBR distribution or AEC-Q200 qualification is prioritized over Vishay's AEC-Q101 option. |
| ON Semiconductor SMA5J40A | Functionally identical electrical specs (VWM = 40 V, VBR = 44.4–49.1 V, VC = 64.5 V), same DO-214AC package and RoHS/E3 marking. | No functional difference in circuit implementation; differs only in manufacturer-specific process and traceability. | Choose ON Semiconductor's version when dual-sourcing is required or when aligned with existing ON Semi BOMs. |
Compared with SMA5J40A-E3/61, SMAJ40A offers tighter VBR control for precision clamping, while ON Semiconductor's SMA5J40A provides drop-in second-source availability without layout or performance trade-offs.
Availability
SMA5J40A-E3/61 is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and DC-DC converter input surge suppression requiring stable component supply and full RoHS compliance.
Supply support for SMA5J40A-E3/61 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 and high-power density.
The SMA5J series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where 500 W surge immunity and AEC-Q101 qualification are essential.
FAQ
What is the clamping voltage of the SMA5J40A-E3/61 under a 500 W transient?
The SMA5J40A-E3/61 clamps to 64.5 V at 7.8 A peak pulse current, corresponding to a 10/1000 µs waveform delivering 500 W. This value is measured per JEDEC standards and defines the maximum voltage seen by protected components during surge events. The SMA5J40A-E3/61 maintains this clamping performance across its rated junction temperature range of –55 °C to +150 °C.
Is SMA5J40A-E3/61 suitable for automotive applications?
Yes, the SMA5J40A-E3/61 is RoHS-compliant and available in AEC-Q101 qualified versions (e.g., SMA5J40AHE3_A). While the E3/61 variant itself is commercial grade, its electrical specs-including 500 W PPPM, 40 A IFSM, and –55 °C to +150 °C operation-meet core requirements for under-hood and body-control module protection. For certified automotive use, specify the HE3 suffix.
How does the SMA5J40A-E3/61 differ from bidirectional variants like SMA5J40CA?
The SMA5J40A-E3/61 is unidirectional, with polarity marked by a cathode band and forward conduction capability; SMA5J40CA is bidirectional and lacks polarity marking. Electrically, SMA5J40CA has symmetrical breakdown in both directions and double the ID limit for VWM ≤10 V-but for 40 V, ID remains ≤1.0 µA. The SMA5J40A-E3/61 is selected when DC-biased protection is needed, such as on positive power rails.
What is the thermal resistance of SMA5J40A-E3/61, and how does it affect PCB layout?
The SMA5J40A-E3/61 has a typical junction-to-ambient thermal resistance (RθJA) of 80 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain safe junction temperature during repeated surges, PCB layout must provide at least this minimum copper area. Reducing pad size increases RθJA and risks thermal runaway during high-duty-cycle transients.
Does SMA5J40A-E3/61 require derating at elevated ambient temperatures?
Yes, the SMA5J40A-E3/61 must be derated above TA = 25 °C per Figure 2 in the datasheet. At 85 °C ambient, its 500 W peak pulse power drops to approximately 350 W, and at 125 °C, it falls to ~200 W. Derating ensures the junction stays below 150 °C during surge events. System-level thermal modeling should include RθJA and expected ambient + self-heating contributions.
SMA5J40A-E3/61 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-E3/61 FAQ
1.How can I place an order for SMA5J40A-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J40A-E3/61 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-E3/61 reliable?
The price and inventory of SMA5J40A-E3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA5J40A-E3/61 is usually 5 days.
3.What payment methods are accepted for SMA5J40A-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J40A-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J40A-E3/61?
SMA5J40A-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J40A-E3/61 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-E3/61?
For technical support, including SMA5J40A-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J40A-E3/61 requirements.
6.How does Aetrix verify that SMA5J40A-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMA5J40A-E3/61 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-E3/61 meets industry standards.
7.What is the process for return or replacement of SMA5J40A-E3/61?
All SMA5J40A-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J40A-E3/61, 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-E3/61 part is unused and in its original packaging.
Return procedure for SMA5J40A-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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