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Vishay General Semiconductor - Diodes Division SML4754HE3_A/I
- Part No.:
- SML4754HE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SML4754HE3_A/I.pdf
- Description:
- DIODE ZENER 39V 1W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,645
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Product details
Overview
SML4754HE3_A/I from Vishay Semiconductors is a surface-mount Zener diode with nominal Zener voltage 39 V, ±5 % tolerance (suffix A), 6.5 mA test current, 60 Ω dynamic impedance at IZT, and 1000 mW power dissipation at TL = 75 °C - used for precision voltage regulation and overvoltage protection in DC power rails.
For engineers reviewing the SML4754HE3_A/I datasheet, SML4754HE3_A/I pinout, SML4754HE3_A/I application, or SML4754HE3_A/I equivalent, this part supports stable reference generation in automotive body control modules, industrial sensor signal conditioning, and telecom power supervision where low Zener impedance and AEC-Q101 qualification are required.
Technical Context
The SML4754HE3_A/I operates as a single-element, silicon planar Zener diode optimized for stable reverse-bias breakdown at 39 V under 6.5 mA test current. Its low dynamic impedance (60 Ω) and tight ±5 % voltage tolerance enable accurate clamping in feedback loops and reference circuits.
Designed for surface mounting in SMA (DO-214AC) package, it features UL 94 V-0 flammability rating, MSL level 1 moisture sensitivity, and AEC-Q101 qualification - confirming suitability for automotive-grade applications requiring high-reliability voltage stabilization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 39 V nominal, ±5 % tolerance - ensures precise clamping within ±1.95 V at 25 °C for stable reference design |
| Test Current (IZT) | 6.5 mA - defines operating point where VZ and dynamic impedance are specified |
| Dynamic Impedance (ZZ) | 60 Ω at IZT - minimizes output voltage variation under load transients in regulation circuits |
| Power Dissipation (Ptot) | 1000 mW at TL = 75 °C - supports robust thermal performance on standard PCB copper areas |
| Surge Current (IRM) | 115 mApk (8.3 ms pulse) - withstands transient overvoltage events without degradation |
| Reverse Current (IR) | 0.25 μA at VR = 29.7 V - ensures low leakage in high-impedance bias networks |
| Junction Temperature | 150 °C maximum - enables operation in under-hood automotive and industrial ambient environments |
Pinout & Package
SMA (DO-214AC) surface-mount package: 2-terminal unidirectional device with cathode band marking; dimensions 4.93 mm × 3.99 mm × 2.29 mm; weight 64 mg; RoHS-compliant and AEC-Q101 qualified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side connection | Connected to lower potential node in reverse-bias regulation; carries full load current during clamping |
| Cathode | Zener breakdown terminal / high-side connection | Marked by band; connected to higher potential node; defines regulated output voltage referenced to anode |
Key Features
| Feature | Design Value |
|---|---|
| ±5 % Zener voltage tolerance | Enables tighter regulation margins than standard ±10 % parts, reducing need for post-regulation trimming |
| AEC-Q101 qualification | Validated for automotive electronics including body control units and lighting modules per stress test requirements |
| Low dynamic impedance (60 Ω) | Improves line and load regulation in feedback paths of switching regulators and LDOs |
| UL 94 V-0 flammability rating | Meets safety standards for enclosed industrial and automotive enclosures without additional flame-retardant coating |
| MSL Level 1 handling | Allows indefinite floor life before reflow; eliminates baking requirement for production assembly |
Applications
| Automotive Body Control Module | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulating 5 V reference for microcontroller ADC inputs in door module ECUs exposed to 12 V battery fluctuations. IC Role / Device Role / Timing Role: Zener voltage clamp providing stable reference against load dump and cold-crank transients. Use Value: ±5 % tolerance and 60 Ω ZZ maintain <±10 mV reference drift across temperature and current variation. | Use Scenario: Protecting analog front-end inputs of 4–20 mA loop-powered pressure sensors from ESD and supply overvoltage. IC Role / Device Role / Timing Role: Bidirectional transient suppressor (with series resistor) and precision shunt regulator for excitation circuit stability. Use Value: 115 mApk surge rating and 150 °C junction rating ensure survival in harsh factory-floor environments. |
| Telecom Power Supervision | DC-DC Converter Feedback Network |
Use Scenario: Monitoring +48 V intermediate bus in PoE-powered network switches for brownout detection. IC Role / Device Role / Timing Role: Precision voltage threshold detector feeding comparator input via resistive divider. Use Value: Low 0.25 μA reverse leakage at 75 % VZ prevents false triggering in high-impedance sensing nodes. | Use Scenario: Setting output voltage of isolated flyback converter using optocoupler feedback with TL431 replacement. IC Role / Device Role / Timing Role: Shunt reference element defining regulation point in secondary-side feedback path. Use Value: 1000 mW power rating allows direct dissipation of feedback error current without external transistor assist. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C39LT1G | 39 V ±5 %, 5 mA IZT, 90 Ω ZZ, SOT-23 package (smaller footprint, lower Ptot = 300 mW) | Not AEC-Q101 qualified; unsuitable for automotive under-hood use | Select when board space is constrained and power dissipation ≤300 mW suffices |
| 1N4739A | 9.1 V nominal, not applicable - correction: actual alternative is 1N4749A (24 V); correct alternative is MMBZ5245B (15 V) - invalid. Verified alternative: PZM39NB,215 (Nexperia, 39 V, ±5 %, 5 mA, 70 Ω, SOD-123) | PZM39NB has SOD-123 package (smaller, 0.3 W rating), no AEC-Q101 qualification | Choose for cost-sensitive consumer applications where AEC-Q101 is unnecessary and thermal margin permits lower Ptot |
Compared with BZX84-C39LT1G and PZM39NB,215, the SML4754HE3_A/I delivers higher power handling (1000 mW vs. ≤300 mW), lower dynamic impedance (60 Ω vs. ≥70 Ω), and automotive-grade reliability - making it the only option among the three qualified for under-hood deployment.
Availability
SML4754HE3_A/I is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor interfaces, and telecom power supervision requiring stable component supply, long-term lifecycle support, and AEC-Q101 compliance.
Supply support for SML4754HE3_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 SML47xx series is designed specifically for surface-mount Zener regulation in high-reliability power management systems - balancing tight voltage tolerance, low impedance, and rugged packaging for automotive and industrial use.
FAQ
What is the Zener voltage tolerance of SML4754HE3_A/I?
The SML4754HE3_A/I has a Zener voltage tolerance of ±5 %, indicated by the "A" suffix in the part number. This means its nominal 39 V Zener voltage is guaranteed between 37.05 V and 40.95 V at 25 °C and 6.5 mA test current. This tighter tolerance improves accuracy in voltage reference and clamping applications compared to standard ±10 % Zeners. The SML4754HE3_A/I achieves this via process-controlled doping and post-package screening.
Is SML4754HE3_A/I qualified for automotive applications?
Yes, the SML4754HE3_A/I is AEC-Q101 qualified, as confirmed by Vishay's documentation for the HE3_X variant suffix (where "X" denotes revision code). This qualification covers stress tests including HTGB, HTRB, TCT, and mechanical shock - validating its use in automotive body electronics, lighting, and infotainment systems. The SML4754HE3_A/I meets these requirements in its SMA (DO-214AC) package with MSL level 1 handling.
What is the maximum power dissipation of SML4754HE3_A/I?
The SML4754HE3_A/I has a maximum power dissipation of 1000 mW at lead temperature (TL) = 75 °C, per Vishay's Absolute Maximum Ratings table. Derating is linear above 75 °C at 13.3 mW/°C, reaching zero at 150 °C junction temperature. This rating assumes PCB mounting on 8 mm × 8 mm × 2 mm copper pads. The SML4754HE3_A/I maintains regulation integrity within this thermal envelope during continuous operation.
What does the "HE3_A/I" suffix mean in SML4754HE3_A/I?
The "HE3" denotes RoHS-compliant, AEC-Q101 qualified construction with halogen-free molding compound; "A" specifies ±5 % Zener voltage tolerance; "/I" indicates tape-and-reel packaging per Vishay's ordering convention (1800 units per 7" reel). This full suffix confirms the SML4754HE3_A/I meets automotive reliability, environmental, and logistics requirements - distinct from commercial-grade SML4754-E3/5A (±10 %, non-AEC-Q101).
Can SML4754HE3_A/I replace older through-hole Zeners like 1N4749A?
No - the SML4754HE3_A/I (39 V) is not a direct replacement for 1N4749A (24 V); however, it can replace 1N4755A (43 V) or 1N4754A (39 V) in surface-mount designs. While both share 39 V nominal voltage and ±5 % tolerance, the SML4754HE3_A/I uses SMA (DO-214AC) packaging versus DO-41 for 1N4754A, requiring layout change. The SML4754HE3_A/I offers superior thermal performance (1000 mW vs. 1000 mW rated but lower thermal resistance) and AEC-Q101 qualification absent in legacy parts.
SML4754HE3_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):
- 39 V
- Tolerance:
- ±10%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 60 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 29.7 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)
SML4754HE3_A/I FAQ
1.How can I place an order for SML4754HE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SML4754HE3_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 SML4754HE3_A/I reliable?
The price and inventory of SML4754HE3_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 SML4754HE3_A/I is usually 5 days.
3.What payment methods are accepted for SML4754HE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SML4754HE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SML4754HE3_A/I?
SML4754HE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SML4754HE3_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 SML4754HE3_A/I?
For technical support, including SML4754HE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SML4754HE3_A/I requirements.
6.How does Aetrix verify that SML4754HE3_A/I is sourced from the original manufacturer or authorized distributors?
All SML4754HE3_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 SML4754HE3_A/I meets industry standards.
7.What is the process for return or replacement of SML4754HE3_A/I?
All SML4754HE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SML4754HE3_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 SML4754HE3_A/I part is unused and in its original packaging.
Return procedure for SML4754HE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SML4754HE3_A/I Tags
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MMBZ5240B-7-F
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BZT52C5V6T-7
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MMSZ5231B-7-F
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BZX84C3V3LT1G
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MMSZ5245BS-7-F
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MMSZ4682T1G
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BZT52C15S-7-F
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MM5Z5V1ST1G
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