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Vishay General Semiconductor - Diodes Division SML4757AHE3_A/I
- Part No.:
- SML4757AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SML4757AHE3_A/I.pdf
- Description:
- DIODE ZENER 51V 1W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,919
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Product details
Overview
SML4757AHE3_A/I from Vishay Semiconductors is a surface-mount Zener diode with nominal zener voltage of 51 V, ±5 % tolerance (suffix A), 5 mA test current, 95 Ω dynamic impedance at IZT, and 1500 mApk surge current rating - used for precision voltage regulation and overvoltage protection in power supply feedback loops and reference circuits.
For engineers reviewing the SML4757AHE3_A/I datasheet, SML4757AHE3_A/I pinout, SML4757AHE3_A/I application, or SML4757AHE3_A/I equivalent, this device delivers stable 51 V clamping under DC and transient conditions in compact SMA (DO-214AC) packaging, with AEC-Q101 qualification and MSL Level 1 moisture sensitivity for automotive and industrial PCB assembly.
Technical Context
This Zener diode operates as a single-element, two-terminal voltage reference with reverse-biased breakdown behavior. Its 51 V nominal zener voltage is specified at 5 mA test current (IZT1), with dynamic impedance of 38.8 Ω at IZT1 and 95 Ω at IZT2, ensuring low regulation error across load variations.
The device features low reverse leakage (≤0.25 μA at VR = 40.8 V), high temperature stability (typical tempco ~30 mV/°C near 51 V), and robust surge capability (1500 mApk, 8.3 ms pulse), making it suitable for regulated DC-DC converter feedback paths and ESD-tolerant clamp networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 51 V nominal, ±5 % tolerance - enables precise 51 V regulation in feedback networks without external trimming. |
| Test Current (IZT) | 5 mA - defines operating point where VZ and dynamic impedance are guaranteed; matches typical bias currents in TL431-based references. |
| Dynamic Impedance (ZZ) | 95 Ω at IZT2 - limits output voltage variation under changing load current; critical for ripple rejection in low-power regulators. |
| Power Dissipation (Ptot) | 1000 mW at TL = 75 °C - supports continuous operation in thermally anchored PCB layouts with 8 mm² copper pads. |
| Surge Current (IRM) | 1500 mApk (8.3 ms pulse) - withstands repetitive line transients per JEDEC standards without degradation. |
| Junction Temperature (Tj) | 150 °C maximum - allows deployment in under-hood automotive modules and industrial controllers with ambient up to 125 °C. |
| Package | SMA (DO-214AC) - industry-standard surface-mount outline with cathode band marking; compatible with automated pick-and-place and reflow. |
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 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / reference ground node | Connected to circuit ground or lower-potential rail; establishes reference polarity for reverse-bias operation. |
| Cathode | Zener breakdown terminal / regulated output node | Connected to voltage source or feedback node; maintains stable 51 V relative to anode during regulation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics requiring reliability under thermal cycling and vibration. |
| ±5 % voltage tolerance (suffix A) | Reduces need for post-assembly calibration in voltage reference designs; improves yield in production-grade power supplies. |
| Low dynamic impedance (95 Ω) | Minimizes output voltage drift under load changes - essential for maintaining tight regulation in battery-powered sensor nodes. |
| MSL Level 1 rating | Permits unlimited floor life before reflow; eliminates baking requirements and simplifies SMT line logistics. |
| 260 °C / 10 s soldering guarantee | Withstands standard lead-free reflow profiles without parametric shift or bond wire failure. |
Applications
| Automotive Engine Control Unit (ECU) Reference | Industrial PLC Analog Input Protection |
|---|---|
Use Scenario: Stabilizing 5 V or 3.3 V LDO feedback divider in engine management systems exposed to load dump transients. IC Role / Device Role / Timing Role: Zener reference element providing fixed 51 V clamp to protect downstream op-amps and ADC drivers. Use Value: Prevents overvoltage damage during ISO 7637-2 Pulse 5a events while maintaining <1 % regulation error at 5 mA bias. |
Use Scenario: Protecting 4–20 mA current loop receiver inputs from field wiring surges in factory automation cabinets. IC Role / Device Role / Timing Role: Reverse-biased shunt clamp limiting input voltage to safe levels for precision instrumentation amplifiers. Use Value: Absorbs 1500 mApk transients without degradation, enabling compliance with IEC 61000-4-5 Level 3 (2 kV) surge immunity. |
| Medical Infusion Pump Power Supply | Telecom Base Station Bias Reference |
Use Scenario: Providing stable voltage reference for isolated flyback controller feedback in Class II medical power supplies. IC Role / Device Role / Timing Role: Primary zener reference in optocoupler-coupled feedback path ensuring accurate output regulation. Use Value: Maintains ±5 % VZ accuracy across –40 °C to +125 °C ambient, supporting IEC 60601-1 creepage and safety margin requirements. |
Use Scenario: Generating stable bias voltage for RF power amplifier bias control circuits in outdoor macro base stations. IC Role / Device Role / Timing Role: Precision clamp regulating gate voltage of GaN HEMTs under varying thermal loads. Use Value: Delivers <30 mV/°C tempco and 95 Ω ZZ to minimize RF output power drift across –30 °C to +70 °C operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C51LT1G | 51 V, ±5 %, SOT-23 package, 300 mW Ptot, 100 Ω ZZ, non-AEC-Q101 | Lower power rating and no automotive qualification; suited for consumer-grade portable devices only. | Select when board space is constrained and automotive reliability is not required. |
| 1N4733A | 51 V, ±5 %, DO-41 through-hole package, 1000 mW Ptot, 17 Ω ZZ, no AEC-Q101 | Higher ZZ spec but legacy through-hole mounting; lacks MSL Level 1 and RoHS-compliant molding compound. | Select only for legacy through-hole designs where rework compatibility outweighs surface-mount efficiency. |
Compared with BZX84-C51LT1G and 1N4733A, the SML4757AHE3_A/I offers AEC-Q101 qualification, SMA package compatibility with modern SMT lines, and guaranteed 95 Ω dynamic impedance - making it the preferred choice for new automotive and industrial designs requiring traceable sourcing and long-term availability.
Availability
SML4757AHE3_A/I is available at Aetrix Electronics and suitable for automotive ECU reference circuits, industrial PLC analog input protection, and medical infusion pump power supplies requiring stable component supply with full traceability and lifecycle support.
Supply support for SML4757AHE3_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 automotive, industrial, and computing markets.
The SML47xxA series is designed specifically for surface-mount voltage regulation and transient suppression in space-constrained, high-reliability applications - emphasizing AEC-Q101 compliance, tight tolerances, and robust surge handling.
FAQ
What is the exact zener voltage tolerance for SML4757AHE3_A/I?
The SML4757AHE3_A/I has a nominal zener voltage of 51 V with ±5 % tolerance, as indicated by the "A" suffix in the part number. This tolerance is verified at 5 mA test current and 25 °C ambient, and applies across the full operating temperature range of –65 °C to +150 °C per the Vishay datasheet Rev. 2.2.
Is SML4757AHE3_A/I qualified for automotive use?
Yes, the SML4757AHE3_A/I is AEC-Q101 qualified, as confirmed by its "HE3_A/I" ordering code variant and explicit listing in the AEC-Q101-qualified column of the Vishay SML4738–SML4764A datasheet. It meets stress test requirements for temperature cycling, humidity, and mechanical shock relevant to automotive ECUs and body control modules.
What is the maximum surge current rating for SML4757AHE3_A/I?
The SML4757AHE3_A/I is rated for 1500 mApk non-repetitive surge current with 8.3 ms pulse width, per JEDEC method. This value is measured at 25 °C and reflects the device's ability to absorb transient energy without parametric shift or catastrophic failure - critical for protecting downstream ICs in industrial power rails.
Does SML4757AHE3_A/I have a RoHS-compliant package?
Yes, the SML4757AHE3_A/I uses a RoHS-compliant SMA (DO-214AC) package with UL 94 V-0 flammability rating and lead-free terminations. The "E3" in the part number denotes Vishay's RoHS-compliant commercial grade, and the "HE3" variant confirms RoHS plus AEC-Q101 qualification.
What is the dynamic impedance of SML4757AHE3_A/I at its test current?
The SML4757AHE3_A/I has a dynamic impedance (ZZ) of 95 Ω at IZT2 = 5 mA, as specified in the Electrical Characteristics table of the Vishay datasheet. This value directly impacts regulation accuracy under varying load conditions and is measured at 25 °C ambient with DC bias.
SML4757AHE3_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):
- 51 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 95 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 38.8 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)
SML4757AHE3_A/I FAQ
1.How can I place an order for SML4757AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SML4757AHE3_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 SML4757AHE3_A/I reliable?
The price and inventory of SML4757AHE3_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 SML4757AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SML4757AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SML4757AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SML4757AHE3_A/I?
SML4757AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SML4757AHE3_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 SML4757AHE3_A/I?
For technical support, including SML4757AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SML4757AHE3_A/I requirements.
6.How does Aetrix verify that SML4757AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SML4757AHE3_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 SML4757AHE3_A/I meets industry standards.
7.What is the process for return or replacement of SML4757AHE3_A/I?
All SML4757AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SML4757AHE3_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 SML4757AHE3_A/I part is unused and in its original packaging.
Return procedure for SML4757AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SML4757AHE3_A/I Tags
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