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Vishay General Semiconductor - Diodes Division SML4752AHE3_A/I
- Part No.:
- SML4752AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SML4752AHE3_A/I.pdf
- Description:
- DIODE ZENER 33V 1W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,823
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Product details
Overview
SML4752AHE3_A/I from Vishay Semiconductors is a surface-mount Zener diode with nominal zener voltage of 33 V, ±5 % tolerance (suffix A), 7.5 mA test current, and 1000 mW power dissipation at TL = 75 °C - designed for precision voltage regulation in power supply feedback loops, overvoltage protection circuits, and reference voltage generation in industrial control modules.
For engineers reviewing the SML4752AHE3_A/I datasheet, SML4752AHE3_A/I pinout, SML4752AHE3_A/I application, or SML4752AHE3_A/I equivalent, this device requires attention to its DO-214AC (SMA) package thermal limits, 45 Ω dynamic impedance at IZT, 135 mApk surge rating, and AEC-Q101 qualification status when selecting for automotive-grade or high-reliability embedded systems.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage across load variations and temperature shifts. Its low dynamic impedance (45 Ω at 7.5 mA) ensures tight regulation under changing current conditions, while the 0.025 V/°C typical temperature coefficient supports predictable drift behavior in ambient ranges up to +150 °C junction temperature.
The device uses a single-junction silicon structure housed in an SMA (DO-214AC) plastic package rated UL 94 V-0, with MSL level 1 moisture sensitivity and guaranteed soldering compatibility at 260 °C for 10 seconds - enabling robust reflow integration into automated PCB assembly lines without popcorn risk.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 33 V nominal, ±5 % tolerance - enables accurate 33 V reference or clamp in feedback networks without post-calibration. |
| Test Current (IZT) | 7.5 mA - defines operating point where VZ and dynamic impedance are specified; matches typical bias currents in TL431-based regulators. |
| Dynamic Impedance (ZZ) | 45 Ω at IZT - determines output voltage variation under load transients; lower than SML4751A (40 Ω) but higher than SML4749A (25 Ω). |
| Power Dissipation (Ptot) | 1000 mW at TL = 75 °C - sets maximum steady-state power handling on standard PCB copper pads; derates linearly above 75 °C. |
| Surge Current (IRM) | 135 mApk (8.3 ms pulse) - withstands transient overvoltage events such as ESD or inductive kickback in DC-DC converter inputs. |
| Junction Temperature (Tj) | 150 °C maximum - allows operation in under-hood automotive environments or sealed industrial enclosures without forced cooling. |
| AEC-Q101 Qualified | Yes - validated for automotive electronic systems per stress test requirements including HTGB, HTRB, and temperature cycling. |
Pinout & Package
SMA (DO-214AC) surface-mount package: 2-terminal unidirectional Zener diode with cathode band marking; dimensions 4.93 mm × 3.99 mm × 2.29 mm; weight 64 mg; RoHS-compliant molding compound rated UL 94 V-0.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side connection in reverse-biased configuration | Connected to circuit ground or lower potential node when used as shunt regulator; carries full load current during clamping. |
| Cathode | Zener breakdown terminal / high-side connection in reverse-biased configuration | Connected to regulated voltage rail; voltage at this terminal remains stable at 33 V ±5 % when reverse current ≥7.5 mA. |
Key Features
| Feature | Design Value |
|---|---|
| ±5 % Zener voltage tolerance | Tighter regulation than standard ±10 % variants - reduces need for trimming resistors in precision feedback paths. |
| AEC-Q101 qualification | Validated reliability for automotive powertrain and body electronics - includes HTGB, HTRB, and mechanical shock testing. |
| Low dynamic impedance (45 Ω) | Minimizes output voltage deviation under load steps - critical for maintaining stability in closed-loop SMPS designs. |
| MSL Level 1 moisture sensitivity | Enables direct placement without baking - simplifies manufacturing flow for high-volume consumer and industrial PCB assembly. |
| UL 94 V-0 flammability rating | Meets safety standards for enclosed power supplies and industrial equipment - eliminates need for additional flame-retardant conformal coating. |
Applications
| Industrial Power Supply Regulation | Automotive Overvoltage Protection |
|---|---|
Use Scenario: Stabilizing 33 V rail in isolated flyback converters for PLC I/O modules. IC Role / Device Role / Timing Role: Shunt voltage reference in optocoupler feedback network controlling primary-side PWM duty cycle. Use Value: Maintains ±1.65 V regulation accuracy over -40 to +85 °C ambient, supporting CE-compliant EMC performance. |
Use Scenario: Clamping transient spikes on 24 V CAN bus power line in vehicle body control units. IC Role / Device Role / Timing Role: Standby overvoltage protector activated during load dump events exceeding 35 V. Use Value: Absorbs 135 mApk surge energy without degradation, meeting ISO 7637-2 Pulse 5a requirements. |
| Medical Equipment Reference | Renewable Energy Charge Controller |
Use Scenario: Providing stable 33 V bias for analog front-end amplifiers in portable ultrasound devices. IC Role / Device Role / Timing Role: Precision voltage reference for ADC reference buffer stage requiring low noise and drift. Use Value: Delivers <10 µV/°C thermal drift contribution and <45 Ω source impedance to minimize gain error. |
Use Scenario: Regulating gate drive voltage for high-side N-channel MOSFETs in solar MPPT controllers. IC Role / Device Role / Timing Role: Clamp diode limiting bootstrap capacitor voltage to safe 33 V level during startup. Use Value: Prevents MOSFET gate oxide overstress while allowing fast switching with minimal conduction loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C33LT1G | 33 V ±5 %, 300 mW Ptot, SOT-23 package, 90 Ω ZZ at 5 mA | Lower power rating and higher impedance limit use to low-current references (<10 mA); unsuitable for >1 W clamping. | Select when board space is constrained and thermal budget permits derating; verify layout thermal relief for 300 mW dissipation. |
| 1N4752A | 33 V ±5 %, 1000 mW Ptot, DO-41 through-hole package, 45 Ω ZZ at 7.5 mA | Same electrical specs but leaded package - incompatible with SMT-only production; requires wave solder or hand-solder rework. | Choose only for legacy repair, prototyping, or mixed-technology boards where through-hole insertion is acceptable. |
Compared with BZX84-C33LT1G and 1N4752A, the SML4752AHE3_A/I delivers identical voltage regulation performance in a surface-mount SMA package with AEC-Q101 qualification - making it the preferred choice for new automotive and industrial designs requiring automated assembly and extended reliability validation.
Availability
SML4752AHE3_A/I is available at Aetrix Electronics and suitable for industrial power supply regulation, automotive overvoltage protection, medical equipment reference, and renewable energy charge controller applications requiring stable component supply, long-term lifecycle support, and AEC-Q101 compliance.
Supply support for SML4752AHE3_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-grade qualification.
The SML47xxA series belongs to Vishay's surface-mount Zener diode product line, engineered for high-stability voltage regulation in space-constrained, thermally demanding environments across automotive, industrial, and medical electronics.
FAQ
What is the Zener voltage tolerance of SML4752AHE3_A/I?
The SML4752AHE3_A/I has a Zener voltage tolerance of ±5 %, indicated by the "A" suffix in the part number. This means its nominal 33 V Zener voltage falls within the range of 31.35 V to 34.65 V at 7.5 mA test current and 25 °C ambient temperature. The tighter tolerance improves accuracy in feedback loops compared to standard ±10 % variants like SML4752HE3_A/I.
Is SML4752AHE3_A/I qualified for automotive applications?
Yes, the SML4752AHE3_A/I is AEC-Q101 qualified, as confirmed by Vishay's documentation for the SML47xxA family. This qualification covers stress tests including high-temperature reverse bias (HTRB), high-temperature gate bias (HTGB), and temperature cycling - validating its suitability for automotive powertrain, body electronics, and infotainment systems.
What package type does SML4752AHE3_A/I use?
The SML4752AHE3_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 RoHS-compliant, UL 94 V-0 rated, and classified as MSL level 1 - allowing direct placement without pre-baking in standard SMT processes.
What is the maximum surge current rating for SML4752AHE3_A/I?
The SML4752AHE3_A/I has a non-repetitive peak surge current rating of 135 mApk, defined per JEDEC method as an 8.3 ms pulse width square wave superimposed on the 7.5 mA test current. This rating applies at Tamb = 25 °C and supports transient suppression in power input stages subject to load dump or inductive switching events.
How does the dynamic impedance of SML4752AHE3_A/I affect regulation performance?
The SML4752AHE3_A/I exhibits 45 Ω dynamic impedance (ZZ) at 7.5 mA test current, meaning a 1 mA change in reverse current causes approximately 45 mV change in Zener voltage. This low value ensures minimal output variation under load transients - critical for maintaining stability in switched-mode power supply feedback networks where tight voltage control is required.
SML4752AHE3_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):
- 33 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 45 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 25.1 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)
SML4752AHE3_A/I FAQ
1.How can I place an order for SML4752AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SML4752AHE3_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 SML4752AHE3_A/I reliable?
The price and inventory of SML4752AHE3_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 SML4752AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SML4752AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SML4752AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SML4752AHE3_A/I?
SML4752AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SML4752AHE3_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 SML4752AHE3_A/I?
For technical support, including SML4752AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SML4752AHE3_A/I requirements.
6.How does Aetrix verify that SML4752AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SML4752AHE3_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 SML4752AHE3_A/I meets industry standards.
7.What is the process for return or replacement of SML4752AHE3_A/I?
All SML4752AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SML4752AHE3_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 SML4752AHE3_A/I part is unused and in its original packaging.
Return procedure for SML4752AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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