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Vishay General Semiconductor - Diodes Division SML4750HE3_A/I
- Part No.:
- SML4750HE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SML4750HE3_A/I.pdf
- Description:
- DIODE ZENER 27V 1W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,809
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Product details
Overview
SML4750HE3_A/I from Vishay Semiconductors is a surface-mount Zener diode with nominal zener voltage of 27 V, ±5 % tolerance (suffix "A"), 9.5 mA test current (IZT), and 35 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 SML4750HE3_A/I datasheet, SML4750HE3_A/I pinout, SML4750HE3_A/I application, or SML4750HE3_A/I equivalent, this AEC-Q101 qualified, RoHS-compliant SMA (DO-214AC) device offers verified surge current handling (170 mApk), low regulation factor, and stable operation up to 150 °C junction temperature - critical for high-reliability embedded power management designs.
Technical Context
This Zener diode operates as a single-element, two-terminal voltage reference device with reverse-biased breakdown behavior. Its electrical performance is specified at Tamb = 25 °C, with derated power dissipation (1000 mW at TL = 75 °C) and MSL level 1 moisture sensitivity rating per J-STD-020.
The SML4750HE3_A/I exhibits a typical temperature coefficient near +10.5 mV/°C (based on family trend at VZ ≈ 27 V), low forward voltage drop (<1.2 V @ 1 A), and robust 260 °C/10 s soldering tolerance - enabling compatibility with standard reflow profiles in automated PCB assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 27 V nominal, ±5 % tolerance - ensures tight regulation accuracy for feedback sensing in 24 V system rails. |
| Test Current (IZT) | 9.5 mA - defines operating point where VZ and dynamic impedance are guaranteed; matches common optocoupler LED drive currents. |
| Dynamic Impedance (ZZ) | 35 Ω at IZT - low impedance minimizes output voltage variation under load transients in regulation circuits. |
| Power Dissipation (Ptot) | 1000 mW at TL = 75 °C - supports continuous operation in compact layouts with moderate copper heatsinking. |
| Surge Current (IRM) | 170 mApk (8.3 ms pulse) - provides transient overvoltage clamping capability without degradation in surge-prone environments. |
| Junction Temperature (Tj) | 150 °C maximum - enables use in under-hood automotive modules and industrial enclosures with elevated ambient temperatures. |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with cathode band marking and 64 mg weight. |
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; MSL level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node; forms reference return path in shunt regulator topologies. |
| Cathode | Zener breakdown terminal / regulated output node | Connected to input rail or feedback node; maintains stable 27 V relative to anode during reverse conduction. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, humidity bias, and ESD testing - suitable for engine control units and ADAS power domains. |
| ±5 % voltage tolerance | Tighter regulation than standard ±10 % variants - reduces need for external trimming in precision feedback paths. |
| Low dynamic impedance (35 Ω) | Minimizes output voltage deviation under varying load conditions - improves stability in closed-loop DC-DC converter feedback networks. |
| MSL level 1 rating | Enables unlimited floor life and standard reflow without baking - simplifies manufacturing logistics for high-volume SMT lines. |
| 260 °C/10 s soldering tolerance | Guarantees mechanical and electrical integrity after exposure to peak reflow temperatures - eliminates risk of delamination or parameter shift. |
Applications
| Industrial Power Supply Feedback | Automotive Load Dump Protection |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback converters for PLC I/O modules. IC Role / Device Role / Timing Role: Shunt voltage reference in optocoupler-based feedback loop. Use Value: 27 V nominal Zener voltage matches common 24 V system rails; ±5 % tolerance ensures consistent regulation across temperature and unit-to-unit variance. |
Use Scenario: Clamping induced transients during alternator load dump events in 12 V/24 V vehicle systems. IC Role / Device Role / Timing Role: Transient voltage suppressor connected between battery rail and ground. Use Value: 170 mApk surge rating withstands ISO 7637-2 Pulse 5a waveforms; 150 °C max junction temperature supports under-hood placement. |
| Programmable Logic Controller Reference | Medical Equipment Overvoltage Detection |
Use Scenario: Providing stable reference for analog input channel scaling in modular PLC backplanes. IC Role / Device Role / Timing Role: Precision voltage reference source for ADC biasing and calibration. Use Value: Low 35 Ω dynamic impedance ensures minimal drift under varying sensor excitation loads; AEC-Q101 qualification adds confidence in long-term field reliability. |
Use Scenario: Monitoring auxiliary power rail integrity in portable diagnostic devices with battery backup. IC Role / Device Role / Timing Role: Overvoltage detection element triggering shutdown logic upon rail excursion. Use Value: Sharp reverse breakdown knee at 27 V enables clean trip-point detection; RoHS compliance meets IEC 60601-1 environmental requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C27LT1G | 27 V ±5 %, SOT-23 package, 300 mW Ptot, 70 Ω ZZ - lower power rating and higher impedance. | Best suited for low-current signal-level referencing; not recommended for >10 mA regulation loads. | Select when board space is constrained and power dissipation remains below 300 mW. |
| 1N4750A | 27 V ±5 %, DO-41 through-hole package, 1000 mW Ptot, 35 Ω ZZ - identical electrical specs but leaded mounting. | Requires wave soldering or hand assembly; unsuitable for fully SMT production lines. | Select only for prototyping, legacy repair, or mixed-technology boards where through-hole is mandated. |
Compared with BZX84-C27LT1G and 1N4750A, the SML4750HE3_A/I uniquely combines AEC-Q101 qualification, SMA surface-mount compatibility, and full 1000 mW power handling - making it the preferred choice for automotive and industrial SMT power regulation where reliability, thermal performance, and assembly scalability are jointly critical.
Availability
SML4750HE3_A/I is available at Aetrix Electronics and suitable for industrial power supplies, automotive control modules, and medical instrumentation requiring stable component supply with traceable sourcing and long-term lifecycle support.
Supply support for SML4750HE3_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 demanding industrial and automotive applications.
The SML47xx series was developed specifically for surface-mount voltage regulation and protection in space-constrained, thermally aggressive environments - emphasizing AEC-Q101 compliance, tight tolerances, and robust surge performance.
FAQ
What is the Zener voltage tolerance for SML4750HE3_A/I?
The SML4750HE3_A/I has a nominal Zener voltage of 27 V with a tolerance of ±5 %, as indicated by the "A" suffix in the part number. This tighter tolerance is confirmed in the Electrical Characteristics table on page 2 of Vishay document 85782, where SML4750A shows VZ range of 25.65 V to 28.35 V at IZT = 9.5 mA.
Is SML4750HE3_A/I qualified for automotive applications?
Yes, the SML4750HE3_A/I is AEC-Q101 qualified, as explicitly stated in the FEATURES section of the Vishay datasheet (Rev. 2.2, p.1). The "HE3_A/I" ordering code denotes RoHS-compliant and AEC-Q101 qualified construction per Vishay's naming convention for the SML47xx family.
What is the maximum surge current rating for SML4750HE3_A/I?
The SML4750HE3_A/I has a peak surge current (IRM) rating of 170 mApk, defined per JEDEC method as a non-repetitive 8.3 ms pulse superimposed on IZT. This value is listed in the Electrical Characteristics table (page 2) under the SML4750A row, confirming its suitability for transient suppression in 24 V systems.
Which package does SML4750HE3_A/I use, and what are its key mechanical properties?
The SML4750HE3_A/I uses the SMA (DO-214AC) package: dimensions 4.93 mm × 3.99 mm × 2.29 mm, weight 64 mg, UL 94 V-0 flammability rating, and MSL level 1 per J-STD-020. These specifications are documented in the PACKAGE section (page 1) and PACKAGE DIMENSIONS (page 5) of Vishay document 85782.
Does SML4750HE3_A/I have a specified dynamic impedance, and at what test condition?
Yes, the SML4750HE3_A/I has a dynamic impedance (ZZ) of 35 Ω, measured at the Zener test current IZT = 9.5 mA and Tamb = 25 °C. This value is published in the Electrical Characteristics table (page 2) under the SML4750A entry, directly supporting design of low-noise, stable voltage references.
SML4750HE3_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):
- 27 V
- Tolerance:
- ±10%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 35 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 20.6 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)
SML4750HE3_A/I FAQ
1.How can I place an order for SML4750HE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SML4750HE3_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 SML4750HE3_A/I reliable?
The price and inventory of SML4750HE3_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 SML4750HE3_A/I is usually 5 days.
3.What payment methods are accepted for SML4750HE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SML4750HE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SML4750HE3_A/I?
SML4750HE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SML4750HE3_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 SML4750HE3_A/I?
For technical support, including SML4750HE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SML4750HE3_A/I requirements.
6.How does Aetrix verify that SML4750HE3_A/I is sourced from the original manufacturer or authorized distributors?
All SML4750HE3_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 SML4750HE3_A/I meets industry standards.
7.What is the process for return or replacement of SML4750HE3_A/I?
All SML4750HE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SML4750HE3_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 SML4750HE3_A/I part is unused and in its original packaging.
Return procedure for SML4750HE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SML4750HE3_A/I Tags
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