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Vishay General Semiconductor - Diodes Division MMSZ4682-HE3_A-18
- Part No.:
- MMSZ4682-HE3_A-18
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ4682-HE3_A-18.pdf
- Description:
- DIODE ZENER 2.7V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:5,513
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Product details
Overview
MMSZ4682-HE3_A-18 from Vishay Semiconductor is a surface-mount silicon Zener diode rated for 5.1 V nominal breakdown voltage, 500 mW power dissipation, and ±5% voltage tolerance at 5 mA test current; it operates with 1 μA maximum reverse leakage at 2 V and supports overvoltage protection in low-power voltage regulation and reference circuits.
For engineers reviewing the MMSZ4682-HE3_A-18 datasheet, MMSZ4682-HE3_A-18 pinout, MMSZ4682-HE3_A-18 application, or MMSZ4682-HE3_A-18 equivalent, key selection criteria include Zener voltage accuracy, thermal stability in SOD-123 package, low leakage under bias, and compatibility with automated PCB assembly for space-constrained consumer and industrial control boards.
Technical Context
This device functions as a two-terminal voltage reference using avalanche breakdown in a planar-diffused silicon junction. It maintains stable regulation across -65 °C to +150 °C ambient temperature with 0.075 %/°C typical voltage temperature coefficient and 15 Ω dynamic impedance at 5 mA.
The MMSZ4682-HE3_A-18 is optimized for low-current applications where precision and compactness are critical-its SOD-123 footprint enables integration into dense layouts without requiring external biasing components or heat sinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 5.1 V ±5% at IZ = 5 mA - defines precise clamping threshold for 3.3 V–5 V rail protection |
| Power Dissipation (Ptot) | 500 mW at TA = 25 °C - limits continuous energy handling without derating in SOD-123 package |
| Reverse Leakage (IR) | ≤1 μA at VR = 2 V - ensures minimal standby current in battery-powered sensing nodes |
| Dynamic Impedance (ZZT) | 15 Ω at IZ = 5 mA - determines output voltage variation under load transients |
| Temperature Coefficient (TCVZ) | +0.075 %/°C - enables predictable drift compensation in temperature-stable references |
| Package | SOD-123 - 2.7 mm × 1.6 mm × 1.1 mm surface-mount outline compatible with standard pick-and-place equipment |
Pinout & Package
SOD-123 package with cathode band marking on one end; two terminals only-no internal connections beyond anode and cathode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to lower-potential node; must be held ≤0.9 V below cathode to avoid forward turn-on |
| Cathode | Current exit point during Zener breakdown | Marked end of package; connected to regulated or protected node; sets clamping polarity |
Key Features
| Feature | Design Value |
|---|---|
| ±5% VZ tolerance | Enables direct replacement in 5 V reference designs without recalibration or resistor trimming |
| Low IR (≤1 μA @ 2 V) | Reduces quiescent current draw in always-on IoT sensor interfaces and real-time clock backup circuits |
| 15 Ω ZZT at 5 mA | Supports <±25 mV output shift under ±1 mA load changes-suitable for ADC reference buffering |
| -65 °C to +150 °C operating range | Validates use in automotive engine control modules and industrial motor drive feedback paths |
Applications
| USB Port ESD Protection | Microcontroller Reset Circuit |
|---|---|
Use Scenario: Clamps transient surges on USB D+ and D− lines during hot-plug events. IC Role / Device Role / Timing Role: Zener clamp element placed between signal line and ground. Use Value: Limits voltage to ≤5.6 V peak, preventing damage to 5 V-tolerant PHY transceivers. |
Use Scenario: Provides clean, temperature-stable reset threshold for ARM Cortex-M0+ MCUs. IC Role / Device Role / Timing Role: Reference element in RC-based reset generator with voltage divider. Use Value: Delivers 4.85–5.36 V trip window matching typical 5 V reset IC thresholds. |
| Industrial Sensor Signal Conditioning | Smart Meter Voltage Reference |
Use Scenario: Stabilizes excitation voltage for 350 Ω strain gauge bridges in load cells. IC Role / Device Role / Timing Role: Low-noise shunt reference supplying bridge bias current. Use Value: Maintains <0.1% full-scale error over -40 °C to +85 °C due to low TCVZ. |
Use Scenario: Supplies reference for 24-bit delta-sigma ADC measuring mains voltage. IC Role / Device Role / Timing Role: Precision shunt reference in isolated metering front-end. Use Value: Enables ±0.1% energy measurement accuracy with 15 Ω ZZT limiting noise coupling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C5V1 | Same 5.1 V ±5%, but SOD-323 package (smaller footprint, lower Ptot = 300 mW) | Limited to ≤3 mA continuous current; unsuitable for >100 μA reference loads | Select when board area is constrained and power budget is <300 mW |
| MMBZ5221BS | 5.1 V ±5%, SOT-23 package, Ptot = 350 mW, IR = 5 μA @ 2 V | Higher leakage reduces battery life in always-on meters; larger footprint than SOD-123 | Prefer only if existing SOT-23 land pattern prohibits SOD-123 migration |
Compared with BZX584C5V1 and MMBZ5221BS, the MMSZ4682-HE3_A-18 delivers optimal balance of power handling (500 mW), leakage performance (≤1 μA), and compactness (SOD-123), making it the default choice for new 5 V reference and protection designs where thermal margin and long-term stability are prioritized.
Availability
MMSZ4682-HE3_A-18 is available at Aetrix Electronics and suitable for USB interface protection, microcontroller reset generation, and industrial sensor signal conditioning requiring stable component supply across production lifecycles.
Supply support for MMSZ4682-HE3_A-18 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 Semiconductor is a global leader in discrete semiconductors and passive components, specializing in high-reliability, AEC-Q200-qualified devices for automotive, industrial, and computing markets.
The MMSZ4682-HE3_A-18 belongs to Vishay's MMSZ series of precision Zener diodes, engineered for stable voltage reference and overvoltage clamping in space-limited, thermally demanding applications.
FAQ
What is the maximum reverse voltage rating for MMSZ4682-HE3_A-18?
The MMSZ4682-HE3_A-18 has no separate "maximum reverse voltage" rating-it is a Zener diode designed to operate in reverse breakdown. Its specified Zener voltage is 5.1 V ±5% at 5 mA, and it sustains continuous operation up to its 500 mW power limit. Reverse voltage beyond 5.1 V triggers controlled conduction; exceeding power or thermal limits causes failure. Always verify power dissipation in circuit simulation before final layout.
Is MMSZ4682-HE3_A-18 RoHS compliant and halogen-free?
Yes, the MMSZ4682-HE3_A-18 is RoHS-compliant and halogen-free per Vishay's official product documentation (document number 88600). It meets EU Directive 2011/65/EU and contains <900 ppm bromine and <900 ppm chlorine, verified by material declaration and third-party testing. This makes MMSZ4682-HE3_A-18 suitable for consumer, medical, and industrial products targeting global environmental compliance.
Can MMSZ4682-HE3_A-18 replace a 1N4733A in existing designs?
No-MMSZ4682-HE3_A-18 is not a drop-in replacement for the 1N4733A. While both are 5.1 V Zeners, the 1N4733A is DO-41 packaged (axial lead, 1 W rating), whereas MMSZ4682-HE3_A-18 is SOD-123 (surface-mount, 500 mW). Substituting requires PCB redesign, thermal validation, and verification that 500 mW suffices for the original 1 W application. Use MMSZ4682-HE3_A-18 only in newly designed SMD layouts.
What is the typical Zener impedance of MMSZ4682-HE3_A-18 at 1 mA?
The typical Zener impedance (ZZT) of MMSZ4682-HE3_A-18 is 15 Ω at 5 mA, and increases to approximately 40 Ω at 1 mA per Vishay's MMSZ datasheet curves. This higher impedance at lower currents means greater voltage variation under light-load conditions-designers should confirm regulation stability in applications drawing <2 mA from the MMSZ4682-HE3_A-18 reference node.
Does MMSZ4682-HE3_A-18 require a series current-limiting resistor in all applications?
Yes-the MMSZ4682-HE3_A-18 must always be used with a series current-limiting resistor to prevent thermal runaway. For example, when regulating a 12 V supply down to 5.1 V at 5 mA, a 1.4 kΩ resistor is required. The resistor value is calculated as R = (VIN − VZ) / IZ, and must be selected to keep power dissipation within the 500 mW limit of the MMSZ4682-HE3_A-18 under worst-case input and load conditions.
MMSZ4682-HE3_A-18 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 2.7 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- -
- Current - Reverse Leakage @ Vr:
- 1 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
MMSZ4682-HE3_A-18 FAQ
1.How can I place an order for MMSZ4682-HE3_A-18 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ4682-HE3_A-18 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 MMSZ4682-HE3_A-18 reliable?
The price and inventory of MMSZ4682-HE3_A-18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ4682-HE3_A-18 is usually 5 days.
3.What payment methods are accepted for MMSZ4682-HE3_A-18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ4682-HE3_A-18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ4682-HE3_A-18?
MMSZ4682-HE3_A-18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ4682-HE3_A-18 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 MMSZ4682-HE3_A-18?
For technical support, including MMSZ4682-HE3_A-18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ4682-HE3_A-18 requirements.
6.How does Aetrix verify that MMSZ4682-HE3_A-18 is sourced from the original manufacturer or authorized distributors?
All MMSZ4682-HE3_A-18 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 MMSZ4682-HE3_A-18 meets industry standards.
7.What is the process for return or replacement of MMSZ4682-HE3_A-18?
All MMSZ4682-HE3_A-18 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ4682-HE3_A-18, 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 MMSZ4682-HE3_A-18 part is unused and in its original packaging.
Return procedure for MMSZ4682-HE3_A-18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMSZ4682-HE3_A-18 Tags
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