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Vishay General Semiconductor - Diodes Division SML4756AHE3_A/I
- Part No.:
- SML4756AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SML4756AHE3_A/I.pdf
- Description:
- DIODE ZENER 47V 1W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,171
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Product details
Overview
SML4756AHE3_A/I 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 control modules.
For engineers reviewing the SML4756AHE3_A/I datasheet, SML4756AHE3_A/I pinout, SML4756AHE3_A/I application, or SML4756AHE3_A/I equivalent, this device delivers stable 47 V clamping under transient surges up to 95 mApk (8.3 ms), supports reflow soldering at 260 °C/10 s, and meets AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This Zener diode operates as a single-element, two-terminal voltage reference with reverse-biased breakdown behavior. Its 47 V nominal zener voltage is specified at 5.5 mA test current (IZT1), with dynamic impedance of 35.8 Ω at IZT1 and 80 Ω at IZT2 (0.25 mA), enabling tight regulation across load and temperature variations.
The device uses a silicon PN junction in SMA (DO-214AC) package, rated for 1000 mW total power dissipation at TL = 75 °C, 150 °C maximum junction temperature, and MSL level 1 moisture sensitivity - confirming suitability for automated SMT assembly without baking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 47 V nominal, ±5 % tolerance - ensures precise 47 V regulation in feedback networks without post-calibration. |
| Test Current (IZT1) | 5.5 mA - defines operating point where VZ and ZZ are guaranteed; matches typical bias currents in TL431-based regulators. |
| Dynamic Impedance (ZZ) | 35.8 Ω at IZT1 - low impedance minimizes output voltage deviation under varying load current in shunt regulator designs. |
| Surge Current (IRM) | 95 mApk (8.3 ms pulse) - provides robust transient overvoltage suppression in DC input rails up to 60 V systems. |
| Power Dissipation (Ptot) | 1000 mW at TL = 75 °C - enables operation at full rating on standard 8 mm² copper pads without derating in ambient ≤75 °C. |
| Reverse Leakage (IR) | ≤5 μA at VR = 37.6 V - guarantees minimal quiescent current draw in battery-backed or low-power monitoring circuits. |
| Package | SMA (DO-214AC) - industry-standard SMT footprint compatible with JEDEC MS-013AC, supports high-volume pick-and-place. |
Pinout & Package
SMA (DO-214AC) package: molded plastic case with cathode band marking; dimensions 4.93 mm × 3.99 mm × 2.29 mm (L × W × H); weight 64 mg; UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / reference ground node | Connected to system ground or lower-potential rail; establishes reference point for zener breakdown voltage measurement. |
| Cathode | Zener breakdown terminal / regulated output node | Connected to voltage node requiring clamping or regulation; delivers stable 47 V relative to anode when reverse biased above VZ. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics - supports extended temperature and reliability requirements. |
| ±5 % voltage tolerance (suffix A) | Reduces need for external trimming in precision voltage references, improving BOM simplicity and production yield. |
| Low dynamic impedance (35.8 Ω) | Enables <±1 % output variation over 1–10 mA load current changes in shunt regulator configurations. |
| 260 °C/10 s soldering endurance | Guarantees mechanical and electrical integrity after standard lead-free reflow profiles without parameter shift. |
| MSL level 1 rating | Allows indefinite floor life before assembly - eliminates baking steps and reduces manufacturing overhead. |
Applications
| Industrial Power Supply Feedback | Automotive Overvoltage Protection |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback converters using optocoupler feedback. IC Role / Device Role / Timing Role: Zener reference element setting TL431 cathode voltage threshold. Use Value: 47 V nominal VZ aligns with common 48 V bus architectures; ±5 % tolerance ensures stable regulation across line/load transients. |
Use Scenario: Clamping transients on 24 V CAN bus power lines during load dump events. IC Role / Device Role / Timing Role: Shunt protection device limiting rail voltage to safe levels during ISO 7637-2 Pulse 5a surges. Use Value: 95 mApk surge rating withstands 100 V/100 ms pulses; AEC-Q101 qualification confirms automotive environmental robustness. |
| Programmable Logic Controller Input Protection | Medical Sensor Reference Voltage |
Use Scenario: Protecting 24 V digital input channels against ESD and field-wiring faults. IC Role / Device Role / Timing Role: Primary clamping element in series TVS + Zener cascade networks. Use Value: Low 80 Ω ZZK at 0.25 mA ensures fast response to sub-millisecond overvoltages; UL 94 V-0 housing meets industrial safety standards. |
Use Scenario: Providing stable bias voltage for analog front-end amplifiers in portable ECG monitors. IC Role / Device Role / Timing Role: Precision voltage reference for ADC reference divider networks. Use Value: 35.8 Ω dynamic impedance limits reference drift to <0.5 mV per 100 μA load change - critical for 16-bit medical-grade conversion accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C47,115 (Nexperia) | Same 47 V ±5 %, but SOT-23 package (smaller size, 350 mW Ptot), higher ZZ (90 Ω), no AEC-Q101 rating. | Preferred for space-constrained consumer PCBs; unsuitable for automotive or high-power industrial use. | Select when board area is critical and surge current <50 mApk suffices. |
| 1N4756A (ON Semiconductor) | Identical 47 V ±5 %, DO-41 through-hole package, same 1000 mW rating, but not AEC-Q101 qualified and MSL level N/A. | Used in legacy through-hole designs or prototyping; lacks SMT compatibility and automotive qualification. | Select only for hand-soldered prototypes or non-automotive replacement where reflow is not required. |
Compared with BZX84-C47,115 and 1N4756A, the SML4756AHE3_A/I uniquely combines AEC-Q101 qualification, SMA SMT compatibility, and 1000 mW power handling - making it the only choice for production automotive or high-reliability industrial power regulation where both thermal performance and qualification compliance are mandatory.
Availability
SML4756AHE3_A/I is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, programmable logic controller input stages, and medical sensor reference circuits requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SML4756AHE3_A/I 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 Semiconductors is a global leader in discrete semiconductors, specializing in high-reliability diodes, MOSFETs, and optoelectronics for industrial, automotive, and computing markets.
The SML47xxA series targets surface-mount voltage regulation and protection in harsh environments - engineered for AEC-Q101 compliance, high-temperature stability, and consistent parametric performance across production lots.
FAQ
What is the exact zener voltage tolerance and test condition for SML4756AHE3_A/I?
The SML4756AHE3_A/I has a nominal zener voltage of 47 V with ±5 % tolerance, measured at a test current (IZT1) of 5.5 mA and ambient temperature of 25 °C. This tolerance is confirmed in the "ELECTRICAL CHARACTERISTICS" table on page 3 of Vishay document 85782 Rev. 2.2, where SML4756A is explicitly listed with marking code "47A" and VZ range 47 V (nom), 44.7–49.4 V (min–max).
Is SML4756AHE3_A/I qualified for automotive applications?
Yes, SML4756AHE3_A/I is AEC-Q101 qualified, as indicated by the "HE3_X" ordering suffix convention (where "_X" denotes revision code A, B, etc.) and explicitly stated in the "FEATURES" section of the Vishay datasheet: "AEC-Q101 qualified available" and "Base P/NHE3_X - RoHS-compliant and AEC-Q101 qualified". The "A/I" suffix in the part number confirms AEC-Q101 grade and tape-and-reel packaging.
What is the maximum surge current rating for SML4756AHE3_A/I and how is it defined?
The SML4756AHE3_A/I has a surge current rating of 95 mApk, defined as a non-repetitive 8.3 ms pulse width square wave or equivalent sine-wave superimposed on IZT per JEDEC® method. This value is listed in the "ELECTRICAL CHARACTERISTICS" table for SML4756A on page 3 of the datasheet, under column "IRM", and applies at Tamb = 25 °C.
Does SML4756AHE3_A/I have a specified dynamic impedance, and at what conditions?
Yes, the SML4756AHE3_A/I has a dynamic impedance (ZZ) of 35.8 Ω, measured at the primary test current IZT1 = 5.5 mA and Tamb = 25 °C. An additional dynamic impedance value of 80 Ω is specified at IZT2 = 0.25 mA - both values appear in the "ELECTRICAL CHARACTERISTICS" table for SML4756A on page 3 of Vishay document 85782.
What package type and mounting compatibility does SML4756AHE3_A/I use?
SML4756AHE3_A/I uses the SMA (DO-214AC) surface-mount package, with standardized dimensions (4.93 mm × 3.99 mm × 2.29 mm), cathode band marking, and JEDEC MS-013AC compliance. It supports reflow soldering at 260 °C for 10 seconds and is rated MSL level 1 - enabling direct integration into high-volume SMT lines without preconditioning.
SML4756AHE3_A/I 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/I FAQ
1.How can I place an order for SML4756AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SML4756AHE3_A/I 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/I reliable?
The price and inventory of SML4756AHE3_A/I 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/I is usually 5 days.
3.What payment methods are accepted for SML4756AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SML4756AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SML4756AHE3_A/I?
SML4756AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SML4756AHE3_A/I 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/I?
For technical support, including SML4756AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SML4756AHE3_A/I requirements.
6.How does Aetrix verify that SML4756AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SML4756AHE3_A/I 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/I meets industry standards.
7.What is the process for return or replacement of SML4756AHE3_A/I?
All SML4756AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SML4756AHE3_A/I, 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/I part is unused and in its original packaging.
Return procedure for SML4756AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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