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Vishay General Semiconductor - Diodes Division SML4751AHE3_A/I
- Part No.:
- SML4751AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SML4751AHE3_A/I.pdf
- Description:
- DIODE ZENER 30V 1W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,650
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Product details
Overview
SML4751AHE3_A/I from Vishay Semiconductors is a surface-mount Zener diode with nominal zener voltage of 30 V, ±5 % tolerance (suffix A), 8.5 mA test current (IZT), and 1000 mW power dissipation at TL = 75 °C. It features low dynamic impedance (22.8 Ω at IZT), low regulation factor, and is qualified to AEC-Q101 for automotive-grade reliability. It serves as a precision voltage reference or overvoltage clamp in DC power rails and analog signal conditioning circuits.
For engineers reviewing the SML4751AHE3_A/I datasheet, SML4751AHE3_A/I pinout, SML4751AHE3_A/I application, or SML4751AHE3_A/I equivalent, this device is selected for stable 30 V regulation in space-constrained PCBs requiring RoHS-compliant, high-temperature soldering (260 °C/10 s), MSL Level 1 handling, and AEC-Q101 qualification for automotive electronics.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain a stable 30 V reference across its terminals under controlled test current (8.5 mA) and exhibits low dynamic impedance (22.8 Ω) for minimal voltage deviation under load variation. Its temperature coefficient is +15 mV/°C near 30 V, enabling predictable drift compensation in bias networks.
The device uses a single-diode configuration in SMA (DO-214AC) package with cathode band marking, rated for junction temperatures up to 150 °C and storage from –65 °C to +150 °C. Surge current capability is 1000 mApk (8.3 ms pulse), supporting transient overvoltage suppression in power supply input stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 30 V nominal, ±5 % tolerance - ensures precise 30 V regulation under 8.5 mA test current for reference stability |
| Power Dissipation (Ptot) | 1000 mW at terminal temperature 75 °C - supports continuous operation in thermally managed PCB layouts |
| Dynamic Impedance (ZZ) | 22.8 Ω at IZT = 8.5 mA - minimizes output voltage variation under changing load current |
| Reverse Current (IR) | ≤0.25 μA at VR = 22.5 V - guarantees low leakage in high-impedance bias and sensing nodes |
| Surge Current (IRM) | 1000 mApk (8.3 ms pulse) - provides robust transient clamping without degradation in surge-prone inputs |
| Junction Temperature (Tj) | 150 °C maximum - enables use in under-hood automotive modules and industrial power supplies |
| Package | SMA (DO-214AC), MSL Level 1 - allows standard reflow assembly without dry-pack requirements |
Pinout & Package
SMA (DO-214AC) surface-mount package: 2-terminal, unidirectional Zener diode with molded plastic body, cathode band marking, and 64 mg weight. Compliant with UL 94 V-0 flammability rating and JEDEC moisture sensitivity Level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / reference ground node | Connected to lower-potential side of regulated circuit; establishes reference point for zener operation |
| Cathode | Zener breakdown terminal / regulated output node | Connected to higher-potential rail; maintains stable 30 V relative to anode during reverse bias |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units and ADAS power domains |
| ±5 % zener voltage tolerance | Reduces need for post-assembly calibration in precision voltage reference designs |
| Low dynamic impedance (22.8 Ω) | Enables <1 % output deviation across 1–10 mA load range in feedback or clamp circuits |
| 260 °C/10 s soldering guarantee | Supports compatibility with lead-free reflow profiles without parametric shift or delamination |
| MSL Level 1 rating | Eliminates baking requirement before assembly, reducing manufacturing overhead and handling risk |
Applications
| Automotive Power Rail Clamp | Industrial Sensor Reference |
|---|---|
Use Scenario: Clamping 12 V/24 V battery-supplied microcontroller I/O lines against load dump transients. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to shunt excess energy above 30 V threshold. Use Value: Prevents damage to downstream logic by limiting voltage excursion to ≤30 V with 1000 mApk surge capability. |
Use Scenario: Providing stable 30 V reference for 16-bit ADC biasing in factory-floor pressure transmitters. IC Role / Device Role / Timing Role: Precision voltage reference source with low dynamic impedance and tight tolerance. Use Value: Enables <±0.5 LSB error contribution from reference drift across –40 °C to +125 °C ambient. |
| DC-DC Converter Feedback | Overvoltage Protection Circuit |
Use Scenario: Setting output voltage in isolated flyback converter feedback loop via optocoupler-coupled divider. IC Role / Device Role / Timing Role: Zener element in secondary-side voltage sense network. Use Value: Delivers stable 30 V reference with <22.8 Ω impedance to minimize feedback error under line/load transients. |
Use Scenario: Standby overvoltage detector in telecom power shelf monitoring 48 V backplane rails. IC Role / Device Role / Timing Role: Threshold-triggered clamp activated when rail exceeds 30 V ±5 %. Use Value: Activates protection within microseconds using low-leakage (≤0.25 μA) behavior below threshold. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C30LT1G | 30 V ±5 %, SOT-23 package, 350 mW Ptot, 30 Ω ZZ | Lower power rating and higher impedance limit use to low-current (<5 mA) references | Select for cost-sensitive, low-power consumer applications where board space is constrained but thermal margin is ample |
| 1N4749A | 24 V nominal, DO-41 through-hole, 1000 mW, ±5 %, 25 Ω ZZ | Fixed 24 V output and through-hole mounting incompatible with SMT-only production | Choose only for legacy through-hole designs requiring 24 V regulation; not a drop-in replacement for SML4751AHE3_A/I |
Compared with BZX84-C30LT1G and 1N4749A, the SML4751AHE3_A/I offers superior thermal performance (1000 mW at TL = 75 °C), lower dynamic impedance (22.8 Ω), and AEC-Q101 qualification-making it the preferred choice for automotive and industrial SMT power management where reliability and regulation accuracy are critical.
Availability
SML4751AHE3_A/I is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor modules, and telecom power supervision systems requiring stable component supply with AEC-Q101 assurance and RoHS compliance.
Supply support for SML4751AHE3_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, power efficiency, and automotive qualification.
The SML47xxA series is part of Vishay's surface-mount Zener diode product line designed specifically for high-reliability voltage regulation and transient suppression in automotive, industrial, and communications power systems.
FAQ
What is the zener voltage tolerance of SML4751AHE3_A/I?
The SML4751AHE3_A/I has a zener voltage tolerance of ±5 %, as indicated by the "A" suffix in the part number. This means its nominal 30 V zener voltage falls within 28.5 V to 31.5 V at the specified test current of 8.5 mA, enabling tighter regulation than standard ±10 % variants in precision reference designs.
Is SML4751AHE3_A/I qualified for automotive applications?
Yes, the SML4751AHE3_A/I is AEC-Q101 qualified, as confirmed by the "HE3_A/I" ordering code suffix denoting RoHS-compliant and AEC-Q101 qualified construction. This qualification covers stress testing for temperature cycling, humidity, mechanical shock, and ESD-making SML4751AHE3_A/I suitable for under-hood and chassis-mounted automotive electronics.
What package type does SML4751AHE3_A/I use?
The SML4751AHE3_A/I uses the SMA (DO-214AC) surface-mount package, measuring 4.93 mm × 3.99 mm × 2.29 mm with a cathode band marking. It is rated MSL Level 1 and supports peak reflow temperatures up to 260 °C for 10 seconds-ensuring compatibility with standard lead-free assembly processes.
What is the maximum surge current rating for SML4751AHE3_A/I?
The SML4751AHE3_A/I has a non-repetitive surge current rating of 1000 mApk per JEDEC-standard 8.3 ms pulse, as specified in the Electrical Characteristics table. This enables reliable transient voltage suppression in power input stages without degradation, provided surge events remain infrequent and within thermal limits.
How does the dynamic impedance of SML4751AHE3_A/I affect regulation performance?
The SML4751AHE3_A/I exhibits a dynamic impedance of 22.8 Ω at 8.5 mA test current, meaning a 1 mA change in zener current results in approximately 22.8 mV change in output voltage. This low value ensures stable regulation under varying load conditions-critical for feedback networks and precision reference applications where voltage drift must be minimized.
SML4751AHE3_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):
- 30 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 40 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 22.8 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)
SML4751AHE3_A/I FAQ
1.How can I place an order for SML4751AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SML4751AHE3_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 SML4751AHE3_A/I reliable?
The price and inventory of SML4751AHE3_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 SML4751AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SML4751AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SML4751AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SML4751AHE3_A/I?
SML4751AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SML4751AHE3_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 SML4751AHE3_A/I?
For technical support, including SML4751AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SML4751AHE3_A/I requirements.
6.How does Aetrix verify that SML4751AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SML4751AHE3_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 SML4751AHE3_A/I meets industry standards.
7.What is the process for return or replacement of SML4751AHE3_A/I?
All SML4751AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SML4751AHE3_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 SML4751AHE3_A/I part is unused and in its original packaging.
Return procedure for SML4751AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SML4751AHE3_A/I Tags
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