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Vishay General Semiconductor - Diodes Division SML4762AHE3_A/I
- Part No.:
- SML4762AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SML4762AHE3_A/I.pdf
- Description:
- DIODE ZENER 82V 1W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,235
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Product details
Overview
SML4762AHE3_A/I from Vishay Semiconductors is a surface-mount Zener diode with nominal Zener voltage of 82 V, ±5 % tolerance (suffix A), 3 mA test current, 62.2 Ω dynamic impedance at IZT, and 3000 mApk surge current rating. It operates in single-diode configuration within the SMA (DO-214AC) package and is used for precision voltage regulation and overvoltage protection in DC power rails.
For engineers reviewing the SML4762AHE3_A/I datasheet, SML4762AHE3_A/I pinout, SML4762AHE3_A/I application, or SML4762AHE3_A/I equivalent, this device is selected for stable reference generation in industrial power supplies, automotive ECU voltage clamping, and telecom surge-protected bias networks where low Zener impedance and AEC-Q101 qualification are critical.
Technical Context
This Zener diode delivers regulated reverse breakdown at 82 V with tight ±5 % tolerance, tested at 3 mA (IZT1) and validated under 25 °C ambient conditions. Its 62.2 Ω dynamic impedance ensures minimal output voltage variation under load transients, while the 200 Ω knee impedance (ZZK at IZT2 = 0.25 mA) supports stable operation near threshold.
The device is rated for 1000 mW total power dissipation at 75 °C lead temperature, junction temperature up to 150 °C, and storage from –65 °C to +150 °C. It meets UL 94 V-0 flammability and J-STD-020 MSL level 1 moisture sensitivity requirements, enabling reflow compatibility up to 260 °C for 10 s.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 82 V nominal, ±5 % tolerance - enables precise 82 V clamping in high-voltage bias and protection circuits |
| Test Current (IZT1) | 3 mA - defines operating point for specified VZ and dynamic impedance measurement |
| Dynamic Impedance (ZZ) | 62.2 Ω at IZT1 - limits voltage deviation under small-signal load changes |
| Surge Current (IRM) | 55 mApk (non-repetitive, 8.3 ms pulse) - withstands transient overvoltage events per JEDEC method |
| Power Dissipation (Ptot) | 1000 mW at TL = 75 °C - sets thermal derating boundary for PCB copper area design |
| Junction Temperature (Tj) | 150 °C maximum - constrains thermal management in enclosed or high-ambient environments |
Pinout & Package
SMA (DO-214AC) surface-mount package: 2-terminal, cathode-banded, plastic molded case weighing 64 mg. Compliant with UL 94 V-0, MSL level 1, and RoHS. Designed for automated placement and IR/reflow soldering (260 °C/10 s).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side reference node | Connected to ground or lower-potential rail in shunt regulator topology |
| Cathode | Zener breakdown terminal / regulated output node | Connected to input supply; maintains 82 V relative to anode during reverse conduction |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics applications including engine control modules and ADAS power domains |
| ±5 % Zener voltage tolerance | Reduces need for post-production trimming in voltage reference designs |
| Low dynamic impedance (62.2 Ω) | Minimizes output voltage drift across ±1 mA load variations in feedback networks |
| High-temperature soldering guarantee | Supports standard SMT reflow profiles without parametric shift or bond degradation |
| UL 94 V-0 flammability rating | Meets safety requirements for enclosed industrial and transportation equipment |
Applications
| Industrial Power Supply Regulation | Automotive ECU Voltage Clamping |
|---|---|
Use Scenario: Stabilizing 82 V auxiliary rail in programmable logic controller (PLC) backplane power distribution. IC Role / Device Role / Timing Role: Shunt Zener regulator providing fixed reference for op-amp feedback and supervisor IC enable thresholds. Use Value: Maintains <±0.5 V regulation error across 1–5 mA load range due to 62.2 Ω ZZ and 3 mA IZT. |
Use Scenario: Protecting microcontroller I/O pins against load-dump transients in 24 V commercial vehicle ECUs. IC Role / Device Role / Timing Role: Clamp diode placed between 24 V rail and protected node, triggered above 82 V. Use Value: Absorbs 55 mApk surge energy without failure, validated per AEC-Q101 stress testing. |
| Telecom Line Interface Protection | Test Equipment Reference Calibration |
Use Scenario: Overvoltage suppression on -48 V DC telecom line interface cards exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary shunt protector downstream of gas discharge tube (GDT), clamping fast-rising transients. Use Value: Responds within nanoseconds to limit peak voltage to ≤85 V, preserving downstream transceivers. |
Use Scenario: Providing traceable 82 V reference in portable multimeter calibration fixtures. IC Role / Device Role / Timing Role: Precision voltage source for ADC full-scale verification and offset nulling. Use Value: ±5 % initial tolerance and <100 ppm/°C tempco support <0.1 % absolute accuracy over 0–50 °C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C82LT1G | 82 V ±5 %, SOT-23 package, 350 mW Ptot, 90 Ω ZZ | Lower power rating and higher impedance limit use to sub-100 mW bias networks | Select when board space is constrained and thermal budget permits lower dissipation |
| 1N4742A | 12 V nominal, DO-41 through-hole, 1 W Ptot, ±5 %, 9.1 Ω ZZ | Not voltage-compatible; serves different regulation tiers and requires PCB through-hole layout | Choose only for legacy 12 V reference redesigns where footprint and voltage match existing design |
Compared with BZX84-C82LT1G, SML4762AHE3_A/I offers 1000 mW power handling and lower dynamic impedance for higher-current regulation; versus 1N4742A, it provides 82 V clamping in surface-mount form but is not a drop-in replacement due to voltage and package mismatch.
Availability
SML4762AHE3_A/I is available at Aetrix Electronics and suitable for industrial power supplies, automotive electronic control units, and telecom infrastructure requiring stable component supply with AEC-Q101 qualification and RoHS compliance.
Supply support for SML4762AHE3_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 Intertechnology is a global semiconductor manufacturer specializing in discrete components, sensors, and passive elements, with emphasis on reliability, precision, and automotive-grade qualification.
The SML47xxA series is part of Vishay's surface-mount Zener diode product line, engineered for high-stability voltage regulation and transient suppression in space-constrained, thermally demanding applications across industrial and automotive markets.
FAQ
What is the Zener voltage tolerance for SML4762AHE3_A/I?
The SML4762AHE3_A/I has a nominal Zener voltage of 82 V with ±5 % tolerance, as indicated by the "A" suffix in the part number. This tolerance is verified at 3 mA test current and 25 °C ambient temperature per Vishay's Rev. 2.2 datasheet. The tighter tolerance reduces calibration overhead in precision reference designs compared to standard ±10 % variants.
Is SML4762AHE3_A/I qualified for automotive applications?
Yes, SML4762AHE3_A/I is AEC-Q101 qualified, as confirmed by its HE3_X ordering code format (where "X" denotes revision) and explicit listing in Vishay's AEC-Q101-compliant Zener diode documentation. This qualification covers stress tests including temperature cycling, humidity bias HAST, and mechanical shock-making it suitable for under-hood and chassis-mounted automotive electronics.
What is the maximum surge current rating for SML4762AHE3_A/I?
The SML4762AHE3_A/I is rated for 55 mApk non-repetitive surge current, defined as an 8.3 ms pulse width square wave or equivalent sine-wave superimposed on the 3 mA test current per JEDEC methodology. This value appears in the "IRM" column of the electrical characteristics table for SML4762A in the Vishay datasheet (Document Number: 85782, Rev. 2.2).
What package type does SML4762AHE3_A/I use?
SML4762AHE3_A/I uses the SMA (DO-214AC) surface-mount package, with dimensions of 4.93 mm × 2.92 mm × 2.29 mm and a cathode band marking. It features UL 94 V-0 flammability rating, MSL level 1 moisture sensitivity, and is rated for peak reflow temperatures up to 260 °C for 10 seconds-fully compatible with standard lead-free assembly processes.
How does the dynamic impedance of SML4762AHE3_A/I affect circuit performance?
The SML4762AHE3_A/I exhibits 62.2 Ω dynamic impedance (ZZ) at 3 mA test current, directly impacting voltage regulation stability. In a shunt regulator, this value determines how much the output voltage shifts per unit change in load current-for example, a ±0.5 mA load variation causes ~±31 mV deviation. Lower ZZ improves regulation but requires careful thermal design due to higher power dissipation at nominal current.
SML4762AHE3_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):
- 82 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 200 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 62.2 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SML4762AHE3_A/I FAQ
1.How can I place an order for SML4762AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SML4762AHE3_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 SML4762AHE3_A/I reliable?
The price and inventory of SML4762AHE3_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 SML4762AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SML4762AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SML4762AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SML4762AHE3_A/I?
SML4762AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SML4762AHE3_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 SML4762AHE3_A/I?
For technical support, including SML4762AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SML4762AHE3_A/I requirements.
6.How does Aetrix verify that SML4762AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SML4762AHE3_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 SML4762AHE3_A/I meets industry standards.
7.What is the process for return or replacement of SML4762AHE3_A/I?
All SML4762AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SML4762AHE3_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 SML4762AHE3_A/I part is unused and in its original packaging.
Return procedure for SML4762AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SML4762AHE3_A/I Tags
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