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Vishay General Semiconductor - Diodes Division SMA5J40-E3/5A
- Part No.:
- SMA5J40-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA5J40-E3/5A.pdf
- Description:
- TVS DIODE 40VWM 71.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,599
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Product details
Overview
SMA5J40-E3/5A from Vishay General Semiconductor is a unidirectional transient voltage suppressor diode (TVS) in DO-214AC (SMA) package, designed for high-energy surge protection on power and signal lines. It features 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 (10/1000 µs). It is widely used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial power supplies.
For engineers reviewing the SMA5J40-E3/5A datasheet, SMA5J40-E3/5A pinout, SMA5J40-E3/5A application, or SMA5J40-E3/5A equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification (via HE3 variant), RoHS-compliant matte tin plating, MSL Level 1 rating, and thermal resistance of 80 °C/W junction-to-ambient.
Technical Context
This TVS diode operates as a clamping device that remains non-conductive below 40 V and rapidly avalanches above its breakdown threshold to limit transient overvoltages. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and low incremental surge resistance, enabling consistent clamping performance under repetitive surges.
The device is rated for 150 °C maximum junction temperature and derates linearly above 25 °C ambient per Figure 2. With 80 °C/W thermal resistance (junction-to-ambient on 5 mm × 5 mm copper pads), it requires careful PCB thermal design for sustained 500 W pulse handling.
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 - Breakdown occurs within this range at 1 mA test current; defines turn-on threshold tolerance |
| VC @ IPPM | 64.5 V - Clamped voltage seen by protected circuit during full 500 W surge event |
| PPPM | 500 W - Peak pulse power handling capability with 10/1000 µs waveform |
| IPPM | 7.8 A - Peak surge current corresponding to 500 W clamping condition |
| TJ max | 150 °C - Absolute maximum junction temperature; sets upper limit for thermal design margin |
| RθJA | 80 °C/W - Thermal resistance from junction to ambient on standard 5 mm × 5 mm pad layout |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, low-profile plastic case with cathode band marking. Matte tin-plated leads meet J-STD-002 solderability and JESD22-B102 reliability standards. Complies with UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional configuration |
| Cathode (banded end) | Reverse-biased clamping terminal | Connected to protected line (e.g., 40 V rail); avalanche conduction occurs when line exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile DO-214AC package | Enables compact placement on dense PCBs and compatibility with automated SMT assembly |
| Glass-passivated junction | Ensures stable VBR tolerance, low leakage (<1 µA), and long-term reliability under thermal cycling |
| AEC-Q101 qualified (HE3 variant) | Validated for automotive-grade stress testing including temperature cycling, HTRB, and ESD |
| MSL Level 1 (260 °C peak) | Allows standard reflow without moisture sensitivity concerns-no baking required pre-assembly |
| 500 W peak pulse power | Provides robust protection against IEC 61000-4-5 Level 4 (4 kV/2 Ω) surges on 12–48 V systems |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 40 V battery-fed ECUs and body control modules from load dump transients up to 120 V. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between supply rail and chassis ground to shunt surge energy away from downstream regulators and microcontrollers. Use Value: Limits rail voltage to ≤64.5 V during 7.8 A surge, preventing latch-up or permanent damage to 48 V-tolerant ICs. | Use Scenario: Safeguarding analog front-end inputs of pressure/temperature sensors in factory automation PLCs exposed to relay coil switching noise. IC Role / Device Role / Timing Role: Standoff protection element on sensor signal lines, absorbing fast-rising inductive spikes before they reach precision ADC inputs. Use Value: Clamps transients within 1 ns response time while adding only 1.0 µA leakage at 40 V, preserving signal integrity and offset accuracy. |
| Telecom DC Power Input Protection | Consumer Device USB Power Path Protection |
Use Scenario: Securing 48 V PoE-powered network switches against lightning-induced surges on Ethernet cable pairs. IC Role / Device Role / Timing Role: Primary overvoltage clamp on secondary-side DC bus after isolation transformer and rectifier. Use Value: Handles 500 W pulses without degradation, maintaining <1.0 µA leakage to avoid standby power loss in always-on equipment. | Use Scenario: Protecting USB-C PD input circuits in portable monitors from accidental 20 V adapter misconnection or hot-swap surges. IC Role / Device Role / Timing Role: Front-end unidirectional suppressor on VBUS line upstream of buck converter and USB controller. Use Value: Clamps 20 V overshoot to ≤64.5 V within nanoseconds, preventing gate oxide rupture in 20 V-rated power switches. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA5J40AHE3/5A | AEC-Q101 qualified; identical electrical specs but enhanced reliability screening for automotive use | Required for automotive ECUs; not necessary for commercial/industrial applications | Select SMA5J40AHE3/5A when automotive qualification is mandated; otherwise SMA5J40-E3/5A suffices |
| SMCJ40A-E3/57T | DO-214AB (SMC) package; higher 1500 W PPPM; same VWM/VC but larger footprint and 2× thermal mass | Better suited for high-repetition surge environments (e.g., motor drives); less space-efficient | Choose SMCJ40A-E3/57T only if >500 W surge margin is needed and board area permits larger SMC package |
Compared with SMA5J40AHE3/5A, the SMA5J40-E3/5A offers identical clamping performance and RoHS compliance but omits automotive qualification tests-reducing cost for non-automotive designs. Versus SMCJ40A-E3/57T, it trades 3× peak power headroom for 40 % smaller PCB area and faster assembly throughput.
Availability
SMA5J40-E3/5A is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface protection, and telecom DC power input protection requiring stable component supply across production lifecycles.
Supply support for SMA5J40-E3/5A 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 and application-specific optimization.
The SMA5J series is part of Vishay's TRANSZORB® TVS platform, engineered for high-power-density transient suppression in space-constrained, high-reliability applications such as automotive electronics and industrial controls.
FAQ
What is the polarity configuration of SMA5J40-E3/5A?
The SMA5J40-E3/5A is a unidirectional TVS diode, meaning it conducts only in reverse bias above its breakdown voltage. The cathode is marked by a band on the DO-214AC package body. This configuration allows it to protect positive DC rails while blocking normal forward current-unlike bi-directional variants (e.g., SMA5J40CA) which lack polarity marking and suppress surges in both directions.
Does SMA5J40-E3/5A meet automotive qualification standards?
No, SMA5J40-E3/5A is the commercial-grade version with RoHS compliance and MSL Level 1 rating, but it is not AEC-Q101 qualified. For automotive applications, the functionally identical SMA5J40AHE3/5A variant must be selected-it undergoes extended stress testing including temperature cycling, highly accelerated life testing (HALT), and ESD validation per AEC-Q101 requirements.
What is the maximum clamping voltage of SMA5J40-E3/5A under surge conditions?
The maximum clamping voltage (VC) of SMA5J40-E3/5A is 64.5 V, measured at its peak pulse current (IPPM) of 7.8 A using a 10/1000 µs waveform. This value represents the worst-case voltage imposed on the protected circuit during a full 500 W transient event and is critical for ensuring downstream components remain within their absolute maximum ratings.
How does the thermal resistance of SMA5J40-E3/5A affect PCB layout?
SMA5J40-E3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 80 °C/W when mounted on 5.0 mm × 5.0 mm copper pads per terminal. To maintain safe junction temperatures during repeated surges, designers must provide adequate copper area and consider thermal vias-especially since power dissipation scales with pulse repetition rate and ambient temperature.
Can SMA5J40-E3/5A replace SMA5J40CA in a circuit?
No-SMA5J40-E3/5A is unidirectional and requires correct polarity orientation, whereas SMA5J40CA is bi-directional with no cathode marking and symmetric clamping in both directions. Substituting one for the other without verifying circuit topology may result in improper protection or forward conduction failure. Always match polarity type to system grounding architecture and transient directionality requirements.
SMA5J40-E3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 71.4V
- Current - Peak Pulse (10/1000µs):
- 7A
- 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)
SMA5J40-E3/5A FAQ
1.How can I place an order for SMA5J40-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA5J40-E3/5A 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 SMA5J40-E3/5A reliable?
The price and inventory of SMA5J40-E3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA5J40-E3/5A is usually 5 days.
3.What payment methods are accepted for SMA5J40-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA5J40-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA5J40-E3/5A?
SMA5J40-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA5J40-E3/5A 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 SMA5J40-E3/5A?
For technical support, including SMA5J40-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA5J40-E3/5A requirements.
6.How does Aetrix verify that SMA5J40-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMA5J40-E3/5A 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 SMA5J40-E3/5A meets industry standards.
7.What is the process for return or replacement of SMA5J40-E3/5A?
All SMA5J40-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMA5J40-E3/5A, 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 SMA5J40-E3/5A part is unused and in its original packaging.
Return procedure for SMA5J40-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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