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Vishay General Semiconductor - Diodes Division SML4752HE3_A/I
- Part No.:
- SML4752HE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SML4752HE3_A/I.pdf
- Description:
- DIODE ZENER 33V 1W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,168
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Product details
Overview
SML4752HE3_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. It features low dynamic impedance (25.1 Ω at IZT), low regulation factor, and AEC-Q101 qualification for automotive-grade reliability in voltage regulation and overvoltage protection circuits.
For engineers reviewing the SML4752HE3_A/I datasheet, SML4752HE3_A/I pinout, SML4752HE3_A/I application, or SML4752HE3_A/I equivalent, this part serves as a precision 33 V reference in power supply feedback loops, ESD-protected I/O clamping, and automotive sensor biasing where stable reverse breakdown and high surge current capability (135 mApk) are required.
Technical Context
This device operates as a single-element, unidirectional Zener diode in the SMA (DO-214AC) package, optimized for surface-mount applications requiring stable reverse-biased voltage regulation. Its electrical behavior is defined by tightly controlled VZ at IZT = 7.5 mA, low ZZK = 45 Ω at IZT2, and IR ≤ 0.25 μA at VR = 25.1 V.
The SML4752HE3_A/I is rated for junction temperatures up to 150 °C and storage from –65 °C to +150 °C, with MSL level 1 moisture sensitivity and UL 94 V-0 flammability compliance. It supports high-temperature soldering (260 °C/10 s) and delivers 135 mApk non-repetitive surge current per JEDEC® method.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 33 V nominal, ±5 % tolerance - ensures precise 33 V regulation in feedback and reference paths |
| Test Current (IZT) | 7.5 mA - standard operating point for specified VZ and dynamic impedance measurement |
| Dynamic Impedance (ZZ) | 25.1 Ω at IZT - low AC impedance enables stable regulation under varying load conditions |
| Power Dissipation (Ptot) | 1000 mW at TL = 75 °C - supports robust thermal performance on standard PCB copper areas |
| Surge Current (IRM) | 135 mApk (8.3 ms pulse) - provides transient overvoltage immunity without degradation |
| Reverse Leakage (IR) | ≤ 0.25 μA at VR = 25.1 V - minimizes standby power loss in high-impedance bias networks |
| Junction Temperature (Tj) | 150 °C maximum - enables operation in under-hood automotive and industrial environments |
Pinout & Package
SMA (DO-214AC) surface-mount package: 64 mg weight, UL 94 V-0 molding compound, MSL level 1 per J-STD-020, cathode band marking on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to lower-potential node in reverse-bias configuration; defines reference return path |
| Cathode | Zener breakdown terminal / regulated output node | Connected to higher-potential rail; maintains stable 33 V relative to anode during regulation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements - supports under-hood and ADAS module deployment |
| ±5 % VZ tolerance (suffix A) | Tighter regulation window than standard ±10 % parts - reduces need for post-regulation trimming in precision supplies |
| Low Zener impedance (25.1 Ω) | Minimizes output voltage variation under dynamic load steps - critical for analog sensor excitation stability |
| High-temperature soldering (260 °C/10 s) | Ensures mechanical and electrical integrity after reflow - eliminates delamination risk in high-volume SMT lines |
| UL 94 V-0 flammability rating | Meets safety standards for enclosed power systems - required for UL/IEC-certified industrial power supplies |
Applications
| Automotive Sensor Biasing | Industrial Power Supply Feedback |
|---|---|
Use Scenario: Providing stable excitation voltage to pressure or temperature sensors in engine control units. IC Role / Device Role / Timing Role: Zener reference diode regulating sensor bridge supply at 33 V. Use Value: Maintains <±0.5 % output drift over –40 °C to +125 °C ambient due to low tempco and AEC-Q101 thermal validation. |
Use Scenario: Setting output voltage in isolated flyback converter feedback loop via optocoupler divider. IC Role / Device Role / Timing Role: Precision shunt reference establishing 33 V threshold for error amplifier input. Use Value: Enables ±1 % output regulation accuracy with minimal component count and no external op-amp. |
| ESD-Protected I/O Clamping | Programmable Logic Supply Clamp |
Use Scenario: Protecting FPGA configuration pins against ±8 kV HBM ESD events in industrial PLCs. IC Role / Device Role / Timing Role: Low-leakage (≤0.25 μA) Zener clamp limiting pin voltage to 33 V. Use Value: Prevents latch-up while adding <1 nA leakage to high-impedance configuration circuitry. |
Use Scenario: Stabilizing 3.3 V LDO input rail against transient spikes in microcontroller subsystems. IC Role / Device Role / Timing Role: Shunt regulator absorbing >135 mApk surges without failure. Use Value: Eliminates need for TVS + series resistor combo - reduces BOM count and board space by 40 %. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C33-7-F (Diodes Inc.) | Same 33 V ±5 %, but SOT-23 package (lower Ptot = 300 mW); ZZ = 90 Ω at 5 mA | Limited to low-power signal-level clamping; unsuitable for >100 mW continuous dissipation | Select when board space is constrained and thermal load is <150 mW |
| 1N4752A (ON Semiconductor) | Same 33 V ±5 %, DO-41 through-hole package; Ptot = 1000 mW; ZZ = 27 Ω at 7.5 mA | Requires wave soldering or hand assembly; incompatible with fully SMT production | Select only for legacy through-hole designs or prototyping where rework flexibility is prioritized |
Compared with BZX84-C33-7-F and 1N4752A, the SML4752HE3_A/I uniquely combines AEC-Q101 qualification, SMA surface-mount compatibility, and full 1000 mW thermal capability - making it the only option qualified for automotive SMT power regulation without derating.
Availability
SML4752HE3_A/I is available at Aetrix Electronics and suitable for automotive sensor modules, industrial power supplies, ESD-protected I/O interfaces, and programmable logic supply clamping requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SML4752HE3_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 Semiconductors is a global leader in discrete semiconductors, specializing in high-reliability diodes, MOSFETs, and optoelectronics for automotive, industrial, and computing markets.
The SML47xx family was designed specifically for surface-mount voltage regulation and transient suppression in space-constrained, thermally demanding applications - emphasizing AEC-Q101 compliance, tight VZ tolerance, and robust surge handling.
FAQ
What is the zener voltage tolerance of SML4752HE3_A/I?
The SML4752HE3_A/I has a zener voltage tolerance of ±5 %, indicated by the "A" suffix in the part number. This means its nominal 33 V breakdown voltage is guaranteed between 31.35 V and 34.65 V at IZT = 7.5 mA and Tamb = 25 °C. This tighter tolerance supports precision regulation without external trimming in SML4752HE3_A/I-based feedback networks.
Is SML4752HE3_A/I qualified for automotive applications?
Yes, the SML4752HE3_A/I is AEC-Q101 qualified, as confirmed by Vishay's documentation for the SML47xxHE3_X series (where "X" denotes revision code). This qualification covers stress tests including HTGB, TCT, and ESD, enabling use in engine control, body electronics, and ADAS modules where SML4752HE3_A/I serves as a regulated bias or clamp element.
What is the maximum surge current rating for SML4752HE3_A/I?
The SML4752HE3_A/I supports a non-repetitive surge current of 135 mApk, measured using an 8.3 ms pulse width square wave per JEDEC® methodology. This rating applies at Tamb = 25 °C and ensures reliable transient suppression in power rails protected by SML4752HE3_A/I without parametric shift or failure.
What package type does SML4752HE3_A/I use?
The SML4752HE3_A/I uses the SMA (DO-214AC) surface-mount package - a standardized plastic case with cathode band marking, 64 mg mass, and dimensions of 4.93 mm × 5.28 mm × 2.29 mm. This package supports automated placement and reflow soldering at 260 °C/10 s, as verified in SML4752HE3_A/I's mechanical data sheet.
How does the dynamic impedance of SML4752HE3_A/I affect regulation performance?
The SML4752HE3_A/I exhibits a dynamic impedance (ZZ) of 25.1 Ω at IZT = 7.5 mA, meaning a 1 mA change in zener current causes ~25 mV output variation. This low value ensures minimal VZ drift under load transients - a key advantage in SML4752HE3_A/I applications like sensor excitation where supply stability directly impacts measurement accuracy.
SML4752HE3_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:
- ±10%
- 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)
SML4752HE3_A/I FAQ
1.How can I place an order for SML4752HE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SML4752HE3_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 SML4752HE3_A/I reliable?
The price and inventory of SML4752HE3_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 SML4752HE3_A/I is usually 5 days.
3.What payment methods are accepted for SML4752HE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SML4752HE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SML4752HE3_A/I?
SML4752HE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SML4752HE3_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 SML4752HE3_A/I?
For technical support, including SML4752HE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SML4752HE3_A/I requirements.
6.How does Aetrix verify that SML4752HE3_A/I is sourced from the original manufacturer or authorized distributors?
All SML4752HE3_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 SML4752HE3_A/I meets industry standards.
7.What is the process for return or replacement of SML4752HE3_A/I?
All SML4752HE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SML4752HE3_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 SML4752HE3_A/I part is unused and in its original packaging.
Return procedure for SML4752HE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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