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Vishay General Semiconductor - Diodes Division SML4758AHE3_A/I
- Part No.:
- SML4758AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SML4758AHE3_A/I.pdf
- Description:
- DIODE ZENER 56V 1W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,083
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Product details
Overview
SML4758AHE3_A/I from Vishay Semiconductors is a surface-mount Zener diode with nominal zener voltage of 56 V, ±5 % tolerance (suffix A), 4.5 mA test current, and 110 Ω dynamic impedance at IZT; it delivers precise voltage regulation in power supply feedback loops, overvoltage protection circuits, and reference voltage generation for industrial DC-DC converters.
For engineers reviewing the SML4758AHE3_A/I datasheet, SML4758AHE3_A/I pinout, SML4758AHE3_A/I application, or SML4758AHE3_A/I equivalent, this AEC-Q101 qualified, RoHS-compliant SMA (DO-214AC) device supports stable 56 V clamping under transient surge conditions up to 2000 mApk and operates reliably across -65 °C to +150 °C junction temperature range.
Technical Context
This Zener diode operates in reverse breakdown mode with low regulation factor and low zener impedance (110 Ω at 4.5 mA), enabling tight voltage stabilization under varying load and line conditions. Its single-diode configuration and SMA package support high-density PCB layouts requiring minimal board space.
The device is rated for 1000 mW total power dissipation at 75 °C lead temperature, with MSL level 1 moisture sensitivity and UL 94 V-0 flammability compliance - confirming suitability for automated reflow assembly and automotive-grade reliability validation per AEC-Q101.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 56 V nominal, ±5 % tolerance - ensures accurate 56 V regulation in feedback networks without post-calibration. |
| Test Current (IZT) | 4.5 mA - defines operating point where VZ and dynamic impedance are specified; matches typical biasing in shunt regulator designs. |
| Dynamic Impedance (ZZ) | 110 Ω at IZT - determines output voltage variation under load transients; lower than standard 1N47xx series for improved regulation. |
| Power Dissipation (Ptot) | 1000 mW at TL = 75 °C - supports continuous operation in compact power supplies with adequate copper thermal relief. |
| Surge Current (IRM) | 2000 mApk (8.3 ms pulse) - withstands short-duration overvoltage events such as ESD or inductive kickback without degradation. |
| Junction Temperature (Tj) | 150 °C maximum - enables deployment in under-hood automotive modules and industrial enclosures with elevated ambient temperatures. |
Pinout & Package
SMA (DO-214AC) surface-mount package with cathode band marking; 64 mg weight, UL 94 V-0 molding compound, and MSL level 1 rating for unlimited floor life before reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node in shunt configuration | Connected to system ground or low-side return path; establishes reference potential for regulated output. |
| Cathode | Zener breakdown terminal / Regulated voltage node | Connected to input rail or feedback node; maintains stable 56 V relative to anode during reverse bias operation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics including engine control units and body control modules requiring extended temperature and lifetime reliability. |
| ±5 % voltage tolerance (suffix A) | Reduces need for external trimming components in precision reference applications, improving BOM simplicity and long-term stability. |
| Low dynamic impedance (110 Ω) | Minimizes output voltage deviation under load steps - critical for maintaining feedback accuracy in isolated flyback controllers. |
| 260 °C/10 s soldering endurance | Guarantees robustness during standard lead-free reflow profiles without parametric shift or delamination. |
| MSL level 1 handling | Eliminates bake requirements prior to assembly, reducing manufacturing overhead and moisture-related field failures. |
Applications
| Automotive Engine Control Unit (ECU) Power Monitoring | Industrial DC-DC Converter Feedback Reference |
|---|---|
Use Scenario: Monitoring 12 V battery rail integrity in engine control modules under cranking and load dump conditions. IC Role / Device Role / Timing Role: Zener clamp protecting microcontroller supply pins and ADC reference inputs from voltage spikes exceeding 56 V. Use Value: Prevents latch-up or damage during ISO 7637-2 Pulse 5a load dump events while maintaining stable 56 V threshold with <110 Ω impedance. |
Use Scenario: Providing precise 56 V reference for optocoupler-based feedback in 48 V–12 V isolated buck-boost converters. IC Role / Device Role / Timing Role: Shunt regulator establishing fixed voltage node that drives optocoupler LED current proportional to output error. Use Value: Enables ±1 % output regulation via tight 56 V reference tolerance and low temperature coefficient (<0.1 %/°C typical). |
| Telecom PoE+ Midspan Surge Protection | Medical Equipment Overvoltage Clamp |
Use Scenario: Clamping induced surges on 57 V PoE+ midspan data lines during lightning-induced transients. IC Role / Device Role / Timing Role: Transient voltage suppressor placed across Ethernet PHY power rails to limit peak voltage to 56 V. Use Value: Absorbs 2000 mApk surge energy without failure, meeting IEC 61000-4-5 Level 3 immunity requirements. |
Use Scenario: Protecting analog front-end sensors in portable ultrasound devices from accidental 60 V DC coupling faults. IC Role / Device Role / Timing Role: Fail-safe voltage limiter on signal conditioning stage input to prevent amplifier saturation or ADC overload. Use Value: Guarantees sensor signal integrity by clamping fault voltage within safe 56 V window while adding <0.5 μA leakage at 45 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C56LT1G | 56 V ±5 %, 5 mA IZT, 100 Ω ZZ, SOT-23 package (smaller footprint, lower power: 350 mW) | Lower power rating limits use to low-current references; unsuitable for >350 mW clamping duty cycles. | Select when board space is constrained and average power remains below 350 mW. |
| 1N4758A | 56 V ±5 %, 4.5 mA IZT, 110 Ω ZZ, DO-41 through-hole package (no surface-mount compatibility) | Requires wave soldering or hand assembly; incompatible with automated SMT lines and high-density layouts. | Select only for legacy through-hole designs or prototyping where reflow compatibility is not required. |
Compared with BZX84-C56LT1G and 1N4758A, the SML4758AHE3_A/I uniquely combines AEC-Q101 qualification, 1000 mW power capability, and SMA surface-mount compatibility - making it the only choice for production automotive and industrial SMT power regulation where reliability, thermal performance, and assembly scalability are jointly critical.
Availability
SML4758AHE3_A/I is available at Aetrix Electronics and suitable for automotive ECU power monitoring, industrial DC-DC converter feedback reference, and telecom PoE+ surge protection requiring stable component supply across multi-year production cycles.
Supply support for SML4758AHE3_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 was designed specifically for high-reliability surface-mount voltage regulation in automotive, industrial, and telecom infrastructure - delivering tighter tolerances, enhanced surge robustness, and AEC-Q101 validation over legacy Zener families.
FAQ
What is the zener voltage tolerance for SML4758AHE3_A/I?
The SML4758AHE3_A/I has a nominal zener voltage of 56 V with ±5 % tolerance, as indicated by the "A" suffix in the part number. This tolerance is verified at 4.5 mA test current and 25 °C ambient temperature, ensuring predictable clamping behavior in production designs without calibration.
Is SML4758AHE3_A/I qualified for automotive applications?
Yes, the SML4758AHE3_A/I is AEC-Q101 qualified and marked with the "HE3_A/I" ordering code, which denotes RoHS compliance and AEC-Q101 qualification. It meets stress testing requirements for temperature cycling, humidity, and mechanical shock applicable to automotive powertrain and body electronics.
What package type does SML4758AHE3_A/I use?
The SML4758AHE3_A/I uses the SMA (DO-214AC) surface-mount package - a standardized plastic case with cathode band marking, 64 mg weight, and dimensions of 4.93 mm × 3.99 mm × 2.29 mm. It is compatible with standard 12 mm tape-and-reel handling and lead-free reflow profiles.
What is the maximum surge current rating for SML4758AHE3_A/I?
The SML4758AHE3_A/I supports a non-repetitive surge current of 2000 mApk per JEDEC method (8.3 ms square wave), measured at rated zener voltage. This rating applies to transient suppression in power rails and ensures survivability during load dump or inductive switching events.
How does the dynamic impedance of SML4758AHE3_A/I affect regulation performance?
The SML4758AHE3_A/I exhibits 110 Ω dynamic impedance at 4.5 mA test current, directly determining how much the output voltage shifts under changing load current. Lower ZZ yields tighter regulation - for example, a 10 mA load step causes only ~1.1 V deviation, critical for stable feedback in switching regulators.
SML4758AHE3_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):
- 56 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 110 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 42.6 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)
SML4758AHE3_A/I FAQ
1.How can I place an order for SML4758AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SML4758AHE3_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 SML4758AHE3_A/I reliable?
The price and inventory of SML4758AHE3_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 SML4758AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SML4758AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SML4758AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SML4758AHE3_A/I?
SML4758AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SML4758AHE3_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 SML4758AHE3_A/I?
For technical support, including SML4758AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SML4758AHE3_A/I requirements.
6.How does Aetrix verify that SML4758AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SML4758AHE3_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 SML4758AHE3_A/I meets industry standards.
7.What is the process for return or replacement of SML4758AHE3_A/I?
All SML4758AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SML4758AHE3_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 SML4758AHE3_A/I part is unused and in its original packaging.
Return procedure for SML4758AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SML4758AHE3_A/I Tags
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