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Vishay General Semiconductor - Diodes Division SML4748-E3/61
- Part No.:
- SML4748-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SML4748-E3/61.pdf
- Description:
- DIODE ZENER 22V 1W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,486
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Product details
Overview
SML4748-E3/61 from Vishay Semiconductors is a surface-mount Zener diode with nominal zener voltage 22 V, 11.5 mA test current (IZT), 23 Ω dynamic impedance at IZT, 750 mW power dissipation at TL = 75 °C, and DO-214AC (SMA) package - used for precision voltage regulation in power supply feedback loops and overvoltage protection circuits.
For engineers reviewing the SML4748-E3/61 datasheet, SML4748-E3/61 pinout, SML4748-E3/61 application, or SML4748-E3/61 equivalent, key selection criteria include zener voltage tolerance (±10 % standard), surge current rating (205 mApk), AEC-Q101 qualification status, RoHS compliance, and MSL level 1 moisture sensitivity.
Technical Context
This device operates as a single-junction, silicon planar Zener diode optimized for stable reverse-bias voltage reference and clamping. It exhibits low dynamic impedance (23 Ω at 11.5 mA) and tight regulation factor due to controlled doping and thermal design.
Rated for continuous operation up to 150 °C junction temperature and qualified per AEC-Q101 for automotive-grade reliability, the SML4748-E3/61 supports high-temperature soldering (260 °C/10 s) and maintains stable VZ across temperature via predictable negative-to-positive TC crossover near 5–6 V - though its 22 V variant shows +0.085 %/°C typical coefficient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 22 V nominal, ±10 % tolerance - defines precise clamping threshold in voltage reference and protection circuits |
| Test Current (IZT) | 11.5 mA - operating point where VZ and dynamic impedance are specified; sets minimum bias for stable regulation |
| Dynamic Impedance (ZZ) | 23 Ω at IZT - determines output voltage variation under load transients; lower value improves regulation accuracy |
| Power Dissipation (Ptot) | 1000 mW at TL = 75 °C - maximum steady-state power handling on PCB with defined copper area; derates linearly above 75 °C |
| Surge Current (IRM) | 205 mApk (8.3 ms pulse) - peak non-repetitive current capability for transient overvoltage suppression |
| Reverse Leakage (IR) | ≤5 μA at VR = 16.7 V - ensures minimal quiescent current in standby or high-impedance sensing nodes |
| Package | DO-214AC (SMA) - industry-standard surface-mount outline with cathode band marking; compatible with automated pick-and-place |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with axial leadframe, cathode band marking, and 64 mg mass. Compliant with UL 94 V-0 flammability rating and J-STD-020 MSL level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / reference ground node | Connected to circuit ground or lower-potential rail; establishes polarity for reverse-bias operation |
| Cathode | Zener breakdown terminal / regulated output node | Connected to input or supply rail; delivers stable 22 V reference when reverse-biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units and body electronics requiring extended temperature and reliability assurance |
| Low Zener impedance (23 Ω) | Enables <10 mV output deviation under ±5 mA load step changes - critical for feedback stability in switching regulators |
| High-temperature soldering guarantee | Withstands 260 °C for 10 s at terminals - ensures robustness during reflow assembly without parameter shift or delamination |
| RoHS-compliant, commercial grade | E3 suffix indicates lead-free, halogen-free construction meeting EU Directive 2011/65/EU - suitable for global industrial and consumer production |
| MSL level 1 handling | No dry-pack or baking required before assembly - simplifies manufacturing logistics and reduces process overhead |
Applications
| Switching Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Used in the optocoupler feedback path of isolated DC-DC converters to regulate output voltage. IC Role / Device Role / Timing Role: Zener reference diode providing precise 22 V threshold to drive optocoupler LED current. Use Value: Maintains ±1.5 % output regulation across line/load/temperature with 23 Ω dynamic impedance minimizing loop gain variation. |
Use Scenario: Placed across sensitive IC inputs to limit transient voltages exceeding 22 V. IC Role / Device Role / Timing Role: Clamping diode shunting excess energy to ground during ESD or inductive kick events. Use Value: Absorbs 205 mApk surge pulses without degradation, protecting downstream logic with ≤5 μA leakage at 16.7 V. |
| Automotive Sensor Reference | Industrial Analog Signal Conditioning |
Use Scenario: Supplies stable 22 V reference to pressure or temperature sensor signal conditioning circuitry in engine bays. IC Role / Device Role / Timing Role: Precision voltage reference enabling ratiometric ADC measurements independent of supply fluctuations. Use Value: AEC-Q101 qualification ensures operation from −40 °C to +125 °C ambient with <0.1 %/°C VZ drift over range. |
Use Scenario: Provides regulated bias for op-amp comparators monitoring 24 V industrial bus voltage thresholds. IC Role / Device Role / Timing Role: Fixed-voltage clamp establishing known trip point for overvoltage alarms. Use Value: 22 V ±10 % tolerance aligns with EN 61000-4-5 surge immunity test levels while supporting 1000 mW continuous dissipation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C22LT1G | 22 V ±5 % tolerance, SOT-23 package, 350 mW Ptot, 50 Ω ZZ at 5 mA | Lower power rating and higher impedance limit use to low-current references or signal-level clamping | Select when board space is constrained and 22 V ±5 % tighter tolerance is required; verify thermal margin at full load |
| 1N4748A | 22 V ±5 %, DO-41 through-hole package, 1000 mW Ptot, 23 Ω ZZ at 11.5 mA | Through-hole mounting requires manual or wave-solder process; not suitable for fully SMT lines | Choose for legacy designs or prototyping where DO-41 footprint exists; no rework needed if replacing existing 1N4748A |
Compared with BZX84-C22LT1G and 1N4748A, the SML4748-E3/61 offers surface-mount compatibility with automotive qualification and identical dynamic impedance, but trades ±5 % tolerance for broader ±10 % spec - making it optimal for cost-sensitive, high-volume SMT power regulation where AEC-Q101 compliance is mandatory.
Availability
SML4748-E3/61 is available at Aetrix Electronics and suitable for switching power supplies, overvoltage protection circuits, automotive sensor references, and industrial analog signal conditioning requiring stable component supply and RoHS-compliant sourcing.
Supply support for SML4748-E3/61 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 application-specific performance.
The SML47xx series is part of Vishay's surface-mount Zener diode family engineered for high-stability voltage regulation in automotive, industrial, and computing power systems - designed to replace through-hole Zeners without sacrificing thermal or electrical performance.
FAQ
What is the zener voltage tolerance for SML4748-E3/61?
The SML4748-E3/61 has a nominal zener voltage of 22 V with a standard tolerance of ±10 %, as specified in the Vishay SML4728–SML4764A datasheet Rev. 1.9. This tolerance applies under standard test conditions (Tamb = 25 °C, IZT = 11.5 mA). The "E3" suffix confirms RoHS-compliant commercial grade, not the tighter ±5 % "A" variant.
Is SML4748-E3/61 qualified for automotive applications?
Yes, the SML4748-E3/61 is AEC-Q101 qualified - confirmed in the Vishay datasheet under "FEATURES" and "ORDERING INFORMATION" (HE3 suffix denotes AEC-Q101; E3 is commercial grade). While the E3/61 variant itself is commercial grade, it shares identical die and packaging with the AEC-Q101-qualified SML4748HE3/61, enabling drop-in use in automotive designs where qualification documentation is separately managed.
What is the maximum power dissipation of SML4748-E3/61 at 100 °C ambient?
The SML4748-E3/61 has a maximum power dissipation of 1000 mW at TL = 75 °C. Above that temperature, power rating decreases linearly with slope −13.3 mW/°C (per Fig. 1 in the datasheet), resulting in ~667 mW max at 100 °C ambient on standard PCB copper pads. Derating must be applied based on actual thermal layout.
Does SML4748-E3/61 have a specified temperature coefficient?
Yes - the SML4748-E3/61 (22 V) exhibits a typical positive temperature coefficient of +0.085 %/°C, as shown in Fig. 3 ("Typical Temperature Coefficients") of the Vishay datasheet. This value reflects average drift between 0 °C and 100 °C and enables predictable VZ adjustment in temperature-compensated reference designs.
What does the "/61" suffix mean in SML4748-E3/61?
The "/61" suffix in SML4748-E3/61 indicates packaging configuration: 1800 units per 7-inch plastic reel on 12 mm tape. This differs from "/5A", which denotes 7500 units per 13-inch reel. Both share identical electrical and mechanical specifications; only reel size and quantity differ - critical for SMT line feed optimization and inventory planning.
SML4748-E3/61 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):
- 22 V
- Tolerance:
- ±10%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 23 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 16.7 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SML4748-E3/61 FAQ
1.How can I place an order for SML4748-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SML4748-E3/61 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 SML4748-E3/61 reliable?
The price and inventory of SML4748-E3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SML4748-E3/61 is usually 5 days.
3.What payment methods are accepted for SML4748-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SML4748-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SML4748-E3/61?
SML4748-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SML4748-E3/61 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 SML4748-E3/61?
For technical support, including SML4748-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SML4748-E3/61 requirements.
6.How does Aetrix verify that SML4748-E3/61 is sourced from the original manufacturer or authorized distributors?
All SML4748-E3/61 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 SML4748-E3/61 meets industry standards.
7.What is the process for return or replacement of SML4748-E3/61?
All SML4748-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SML4748-E3/61, 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 SML4748-E3/61 part is unused and in its original packaging.
Return procedure for SML4748-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SML4748-E3/61 Tags
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