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Vishay General Semiconductor - Diodes Division SML4756AHE3_A/H
- Part No.:
- SML4756AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SML4756AHE3_A/H.pdf
- Description:
- DIODE ZENER 47V 1W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,367
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Product details
Overview
SML4756AHE3_A/H from Vishay Semiconductors is a surface-mount Zener diode with nominal zener voltage of 47 V, ±5 % tolerance (suffix A), 5.5 mA test current, and 80 Ω dynamic impedance at IZT, designed for precision voltage regulation in power supply feedback loops, overvoltage protection circuits, and reference voltage generation in industrial and automotive control modules.
For engineers reviewing the SML4756AHE3_A/H datasheet, SML4756AHE3_A/H pinout, SML4756AHE3_A/H application, or SML4756AHE3_A/H equivalent, this device offers AEC-Q101 qualification, SMA (DO-214AC) package compatibility, low regulation factor, and high-temperature soldering capability (260 °C/10 s), supporting robust design-in for automotive-grade and high-reliability embedded systems.
Technical Context
This Zener diode operates as a single-element, cathode-anode polarized voltage reference with reverse-biased breakdown behavior. Its electrical performance is specified at Tamb = 25 °C, with derated power dissipation up to 1000 mW at TL = 75 °C and junction temperature limit of 150 °C.
The device features low Zener impedance (80 Ω at 5.5 mA), tight voltage tolerance (±5 %), and surge current rating of 95 mApk (8.3 ms pulse), meeting JEDEC® surge test methodology. It is RoHS-compliant and qualified to AEC-Q101 for automotive applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 47 V nominal, ±5 % tolerance - ensures stable reference within ±2.35 V across production lot |
| Test Current (IZT) | 5.5 mA - defines operating point where VZ and dynamic impedance are guaranteed |
| Dynamic Impedance (ZZ) | 80 Ω at IZT - limits output voltage variation under load transients in regulation circuits |
| Power Dissipation (Ptot) | 1000 mW at TL = 75 °C - supports continuous operation in thermally constrained PCB layouts |
| Surge Current (IRM) | 95 mApk (8.3 ms pulse) - withstands transient overvoltage events without degradation |
| Junction Temperature | 150 °C max - enables use in under-hood automotive environments and industrial enclosures |
| Package | SMA (DO-214AC) - industry-standard SMD footprint with MSL level 1 moisture sensitivity |
Pinout & Package
SMA (DO-214AC) plastic package with cathode band marking; 64 mg weight; UL 94 V-0 flammability rating; compatible with standard reflow and wave soldering processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node in shunt regulation configuration |
| Cathode | Zener breakdown terminal / voltage reference output | Connected to regulated node; reverse-biased to maintain 47 V reference against input variations |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics per stress test requirements including HTOL, TC, HAST, and ESD |
| ±5 % voltage tolerance | Reduces need for post-production trimming in voltage reference designs |
| Low dynamic impedance (80 Ω) | Minimizes output voltage drift under varying load currents in feedback networks |
| High-temperature soldering (260 °C/10 s) | Ensures mechanical and electrical integrity after standard SMT reflow profiles |
| MSL Level 1 rating | Eliminates bake preconditioning requirement before assembly |
Applications
| Automotive Engine Control Unit (ECU) Power Monitoring | Industrial PLC Analog Input Protection |
|---|---|
Use Scenario: Monitoring 12 V battery rail in engine control units with ±15 % variation during cranking and load dump. IC Role / Device Role / Timing Role: Shunt voltage reference in comparator-based overvoltage detection circuit. Use Value: 47 V clamping threshold prevents false triggering while accommodating system-level transients up to 95 mApk. |
Use Scenario: Protecting 24 V analog input channels in programmable logic controllers from field-wiring induced surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on signal path before ADC front-end. Use Value: 80 Ω ZZ ensures minimal loading on sensor signal lines during normal operation. |
| Medical Infusion Pump Power Supply Feedback | Telecom Base Station DC-DC Reference |
Use Scenario: Providing stable 47 V reference for isolated flyback converter feedback in Class II medical devices. IC Role / Device Role / Timing Role: Precision voltage reference in optocoupler-coupled secondary-side regulation loop. Use Value: ±5 % tolerance and low tempco enable compliance with IEC 60601-1 ripple and accuracy requirements. |
Use Scenario: Generating stable bias voltage for RF power amplifier bias control in outdoor telecom equipment. IC Role / Device Role / Timing Role: Low-noise voltage reference for DAC-controlled bias network. Use Value: AEC-Q101 qualification supports extended lifetime reliability in unattended base station deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C47LT1G | 47 V ±5 %, SOT-23 package, 350 mW Ptot, 100 Ω ZZ | Lower power rating and higher impedance limit use in high-current regulation | Select when board space is constrained and thermal budget allows < 350 mW operation |
| 1N4756A | 47 V ±5 %, DO-41 through-hole, 1000 mW Ptot, 80 Ω ZZ, no AEC-Q101 | Lacks automotive qualification and surface-mount compatibility | Select only for legacy through-hole designs where rework and thermal cycling are not critical |
Compared with BZX84-C47LT1G and 1N4756A, the SML4756AHE3_A/H uniquely combines AEC-Q101 qualification, SMA package, and 1000 mW power handling - making it the only option suitable for new automotive SMT designs requiring both reliability and thermal headroom.
Availability
SML4756AHE3_A/H is available at Aetrix Electronics and suitable for automotive ECU designs, industrial PLC protection circuits, medical power supply feedback loops, and telecom DC-DC bias networks requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SML4756AHE3_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 Intertechnology is a global semiconductor manufacturer specializing in discrete components, sensors, and passive elements, with emphasis on reliability, precision, and automotive-grade qualification.
The SML4756AHE3_A/H belongs to Vishay's SML47xxA surface-mount Zener diode family, engineered for high-stability voltage reference and overvoltage protection in space-constrained, thermally demanding applications across automotive, industrial, and medical markets.
FAQ
What is the exact zener voltage tolerance for SML4756AHE3_A/H?
The SML4756AHE3_A/H has a nominal zener voltage of 47 V with ±5 % tolerance, as indicated by the "A" suffix in the part number. This means the actual measured VZ at 5.5 mA test current falls between 44.65 V and 49.35 V under standard test conditions (Tamb = 25 °C). The tolerance is guaranteed across the full operating temperature range and lifetime of the SML4756AHE3_A/H.
Is SML4756AHE3_A/H qualified for automotive applications?
Yes, the SML4756AHE3_A/H is AEC-Q101 qualified, as confirmed by its "HE3_A/H" ordering code - where "HE3" denotes RoHS-compliant and AEC-Q101 qualified construction. This qualification covers stress tests including high-temperature operating life, temperature cycling, and unbiased highly accelerated stress testing, making the SML4756AHE3_A/H suitable for under-hood and chassis-mounted automotive electronics.
What is the maximum power dissipation of SML4756AHE3_A/H at 75 °C lead temperature?
The SML4756AHE3_A/H has a maximum power dissipation (Ptot) of 1000 mW when the lead temperature (TL) is maintained at 75 °C. This rating assumes PCB mounting on 8 mm × 8 mm × 2 mm copper pads. Derating is required above 75 °C, with zero power allowed at 150 °C junction temperature. The SML4756AHE3_A/H thermal design must account for this linear derating curve to ensure safe operation.
Does SML4756AHE3_A/H have a defined surge current rating?
Yes, the SML4756AHE3_A/H has a specified non-repetitive surge current (IRM) of 95 mApk, defined per JEDEC® method as an 8.3 ms pulse-width square wave superimposed on the 5.5 mA test current. This rating validates the SML4756AHE3_A/H for transient overvoltage suppression in automotive load-dump and inductive switching scenarios without parametric shift or failure.
What package type does SML4756AHE3_A/H use, and is it RoHS-compliant?
The SML4756AHE3_A/H uses the SMA (DO-214AC) surface-mount package, with dimensions of 4.93 mm × 3.99 mm × 2.29 mm and a cathode band marking. It is RoHS-compliant, as indicated by the "E3" suffix in the part number, and carries UL 94 V-0 flammability certification. The SML4756AHE3_A/H also meets MSL level 1 per J-STD-020, eliminating pre-bake requirements prior to reflow soldering.
SML4756AHE3_A/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Series:
- -
- Package/Case:
- DO-214AC, SMA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 47 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 80 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 35.8 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SML4756AHE3_A/H FAQ
1.How can I place an order for SML4756AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SML4756AHE3_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 SML4756AHE3_A/H reliable?
The price and inventory of SML4756AHE3_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 SML4756AHE3_A/H is usually 5 days.
3.What payment methods are accepted for SML4756AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SML4756AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SML4756AHE3_A/H?
SML4756AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SML4756AHE3_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 SML4756AHE3_A/H?
For technical support, including SML4756AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SML4756AHE3_A/H requirements.
6.How does Aetrix verify that SML4756AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SML4756AHE3_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 SML4756AHE3_A/H meets industry standards.
7.What is the process for return or replacement of SML4756AHE3_A/H?
All SML4756AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SML4756AHE3_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 SML4756AHE3_A/H part is unused and in its original packaging.
Return procedure for SML4756AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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