dezembro 30, 2025
401
In today's electronics landscape, reliable voltage regulation and protection are critical for circuit stability. The MMSZ4694T1 from onsemi stands out as a high-performance 8.2V Zener diode in the compact SOD-123 package, offering 500mW power dissipation and ±5% tolerance. With increasing demand for miniaturized components in automotive and industrial applications, this diode combines precision with robust ESD protection (Class 3, >16kV). Below, we explore its technical advantages, compare it with alternatives, and provide actionable selection insights to streamline your design process.
The MMSZ4694T1 is a surface-mount Zener diode designed for voltage regulation and protection in space-constrained applications. Key attributes include:
Voltage Rating: 8.2V nominal Zener voltage (VZ) with ±5% tolerance
Power Handling: 500mW maximum power dissipation
Package: SOD-123 (2.5mm x 1.8mm), optimized for automated assembly
Temperature Range: -55°C to +150°C (per onsemi datasheet)
ESD Protection: Exceeds 16kV (Human Body Model, Class 3)
| Parameter | Value | Test Condition |
|---|---|---|
| Zener Voltage (VZ) | 8.2V ±5% | IZT = 5mA |
| Maximum Power Dissipation | 500mW | @ 25°C ambient |
| Reverse Leakage Current | 1µA max | @ VR = 6.2V |
| Forward Voltage (VF) | 900mV max | @ IF = 10mA |
| Operating Temperature | -55°C to +150°C | Junction temperature |
Follow these steps to determine if the MMSZ4694T1 fits your design:
Voltage Requirement: Ensure 8.2V matches your regulation/clipping needs.
Power Calculation: Verify that (VZ × IZ) ≤ 500mW with derating above 25°C.
Package Constraints: SOD-123 suits high-density PCB layouts.
Environmental Factors: AEC-Q101 qualification makes it ideal for automotive applications.
Alternatives: Consider MMSZ4688T1 (6.8V) or MMSZ4700T1 (10V) for adjacent voltages.
Voltage Regulation: Stabilizes 8.2V supply rails in IoT sensors.
MOSFET Gate Protection: Clamps transient voltages in motor drivers.
Waveform Clipping: Limits signal amplitudes in audio circuits.
ESD Protection: Safeguards USB ports and communication lines.
The global Zener diode market is projected to grow at 4.2% CAGR (2023-2030), driven by:
Expanding automotive electronics (ADAS, infotainment)
5G infrastructure requiring robust ESD protection
Miniaturization trends favoring SOD-123 packages
While the MMSZ4694T1 is marked obsolete by onsemi, direct replacements like the MMBZ4694LT1G (same specs, active status) ensure design continuity.
| Model | VZ | Tolerance | Package | Key Difference |
|---|---|---|---|---|
| MMSZ4694T1 | 8.2V | ±5% | SOD-123 | Obsolete status |
| MMBZ4694LT1G | 8.2V | ±5% | SOD-123 | Active production, AEC-Q101 |
| BZT52C8V2-7-F | 8.2V | ±7% | SOD-123 | Wider tolerance, lower cost |
No. As an obsolete part, we recommend the MMBZ4694LT1G for new projects with identical specifications.
Power dissipation decreases linearly to 0mW at 150°C (3.33mW/°C derating).
Yes, but limit surge duration. For repetitive pulses, keep IZSM below 1A (per onsemi AN-807).
SOD-123 (2.5×1.8mm) offers better thermal performance than SOD-323 (1.8×1.3mm) but occupies more board space.
Yes, Pb-free versions are available (check part number suffix).
Next-gen Zener diodes are expected to feature:
Lower leakage currents (<100nA)
Higher ESD ratings (≥30kV)
Integrated TVS-Zener hybrid devices
For pricing, samples, or technical support on the MMSZ4694T1 or its alternatives, contact our team at sales@censtry.com.
The MMSZ4694T1 remains a proven solution for 8.2V regulation despite its obsolete status, with modern drop-in replacements ensuring long-term supply. Its balance of precision (±5%), power handling (500mW), and compact SOD-123 package makes it ideal for space-constrained designs requiring reliable voltage clamping. Engineers should evaluate thermal requirements and consider AEC-Q101 qualified alternatives for automotive applications.
