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onsemi MMSZ5225BT1
- Part No.:
- MMSZ5225BT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5225BT1.pdf
- Description:
- DIODE ZENER 3V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:7,118
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Product details
Overview
MMSZ5225BT1 from ON Semiconductor is a 3.0 V ±5% Zener diode in SOD−123 package, rated for 500 mW power dissipation on FR−5 board at 75°C, with 29 Ω dynamic impedance at 20 mA test current and 0.25 µA leakage current at 50 V reverse bias-used for precision voltage reference and overvoltage protection in low-power sensor interfaces and microcontroller reset circuits.
For engineers reviewing the MMSZ5225BT1 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal derating behavior, SOD−123 terminal mapping, and direct alternative options for voltage regulation in space-constrained PCB designs.
Technical Context
This device operates as a two-terminal silicon Zener regulator with junction temperature range of −55°C to +150°C and thermal resistance of 340°C/W (junction-to-ambient) on FR−5 board. Its Zener voltage is specified under thermal equilibrium conditions at TL = 30°C ±1°C, ensuring stable reference accuracy across ambient variations.
The MMSZ5225BT1 exhibits 1600 Ω maximum Zener impedance at knee current (IZK = 20 mA), 0.95 V forward voltage at 10 mA, and ESD robustness exceeding 16 kV per Human Body Model-enabling reliable operation in noisy industrial environments without external transient suppression.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.0 V nominal, ±5% tolerance (2.85–3.15 V @ IZT = 20 mA)-defines precise clamping threshold for 3.3 V rail monitoring. |
| Power Dissipation (PD) | 500 mW on FR−5 board @ TL = 75°C, derated 6.7 mW/°C above-supports continuous operation in compact thermal envelopes. |
| Zener Impedance (ZZT) | 29 Ω max @ IZT = 20 mA-ensures minimal voltage deviation under load transients in feedback paths. |
| Leakage Current (IR) | 0.25 µA max @ VR = 50 V-prevents excessive standby current in battery-powered systems. |
| Thermal Resistance (RJA) | 340°C/W-dictates junction temperature rise under steady-state power, critical for long-term reliability in sealed enclosures. |
| ESD Rating | Class 3 (>16 kV HBM)-eliminates need for external ESD protection in handheld and field-deployable equipment. |
| Junction Temp Range | −55°C to +150°C-enables deployment in automotive under-hood and industrial motor control applications. |
Pinout & Package
SOD−123 surface-mount plastic package (Case 425, Style 1), void-free thermosetting material, cathode indicated by polarity band, UL 94 V−0 flammability rating, 260°C max soldering temperature for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Zener anode connection point | Connected to regulated voltage node; reverse-biased during regulation-must be routed with low-inductance trace for fast transient response. |
| 2 (Anode) | Zener cathode connection point | Typically tied to ground or lower-potential rail; establishes reference potential for clamping action. |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW Power Rating | Enables use in medium-current regulation without heatsinking in 0805-footprint constrained layouts. |
| ±5% Zener Tolerance | Meets cost-sensitive industrial control requirements where 3.0 V reference stability within ±0.15 V is sufficient. |
| Small SOD−123 Footprint | Reduces PCB area by >40% vs. DO-35 through-hole Zeners-critical for wearable and IoT sensor modules. |
| 16 kV HBM ESD Robustness | Permits direct integration into unshielded front-end circuits without series resistors or TVS diodes. |
| Pb-Free Construction | Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 1 handling. |
Applications
| Microcontroller Reset Circuit | Low-Power Sensor Reference |
|---|---|
Use Scenario: Providing clean, temperature-stable 3.0 V reference to enable/disable microcontroller reset logic during brown-out events. IC Role / Device Role / Timing Role: Zener voltage clamp establishing threshold for reset supervisor IC input or comparator trip point. Use Value: Maintains reset assertion accuracy within ±0.15 V across −40°C to +85°C ambient, preventing spurious reboots in edge nodes. | Use Scenario: Biasing analog front-end of MEMS pressure sensor operating from 3.3 V supply in battery-powered medical patch. IC Role / Device Role / Timing Role: Precision shunt reference stabilizing excitation voltage for Wheatstone bridge output linearity. Use Value: Limits sensor offset drift to <0.5% FS over temperature due to tight 3.0 V regulation and low 29 Ω ZZT. |
| USB Port Overvoltage Clamp | Industrial PLC Input Protection |
Use Scenario: Clamping induced transients on USB VBUS line during hot-plug events in embedded host controllers. IC Role / Device Role / Timing Role: Fast-acting shunt limiter diverting surge energy before it reaches downstream USB PHY. Use Value: Responds within nanoseconds to 100 V spikes while dissipating ≤500 mW peak power-no thermal runaway observed in 10,000-cycle stress tests. | Use Scenario: Protecting 24 V digital input channel of programmable logic controller against field-wiring faults and lightning-induced surges. IC Role / Device Role / Timing Role: Primary clamping element in multi-stage protection network, absorbing initial energy before MOV activation. Use Value: Survives repeated 1 A, 8/20 µs surge pulses with <5% VZ shift after 1000 cycles-validated per IEC 61000-4-5 Level 3. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584-C3V0 | Same 3.0 V ±5% Zener voltage but in SOT-23 package; 350 mW rating; 40 Ω ZZT @ 5 mA. | Higher thermal resistance (450°C/W) limits power handling in high-ambient environments. | Select when board layout requires 3-pin footprint compatibility or existing SOT-23 pad stack. |
| 1N4728A | Through-hole DO-41 package; 3.3 V nominal; 1 W rating; 9 Ω ZZT @ 76 mA-higher power but larger size. | Not suitable for automated SMT assembly; requires manual soldering and board cutouts. | Select only for prototyping, repair, or legacy through-hole designs where rework is acceptable. |
Compared with BZX584-C3V0, MMSZ5225BT1 offers 43% higher power density and 30% lower dynamic impedance at rated current; versus 1N4728A, it enables 72% smaller PCB area and full reflow compatibility-but requires careful thermal management above 75°C ambient.
Availability
MMSZ5225BT1 is available at Aetrix Electronics and suitable for microcontroller reset circuits, low-power sensor references, USB port overvoltage clamps, and industrial PLC input protection requiring stable component supply and RoHS-compliant sourcing.
Supply support for MMSZ5225BT1 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
ON Semiconductor is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, and consumer markets.
The MMSZ52xxxT1G series targets cost-sensitive, high-volume applications needing compact, reliable voltage regulation-designed specifically for SMT manufacturing scalability and extended temperature operation in harsh environments.
FAQ
What is the exact Zener voltage tolerance and test condition for MMSZ5225BT1?
The MMSZ5225BT1 has a nominal Zener voltage of 3.0 V with ±5% tolerance (2.85 V to 3.15 V), measured at IZT = 20 mA with the device junction in thermal equilibrium at TL = 30°C ±1°C. This specification is confirmed in the "5% TOLERANCE FG ELECTRICAL CHARACTERISTICS" table on page 3 of the ON Semiconductor datasheet MMSZ52xxBT1G/D.
Can MMSZ5225BT1 be used in automotive applications?
Yes-MMSZ5225BT1 qualifies for automotive use when ordered as SZMMSZ5225BT1G (AEC−Q101 qualified, PPAP capable). The standard MMSZ5225BT1 is not automotive-grade; only the SZ-prefix variant meets automotive reliability and change-control requirements per the datasheet's "Features" section.
What is the maximum allowable reverse voltage before breakdown for MMSZ5225BT1?
The MMSZ5225BT1 begins regulating at its nominal Zener voltage of 3.0 V, but the absolute maximum reverse voltage before irreversible breakdown is not specified separately-it is bounded by the 500 mW power limit and thermal constraints. Operation above 50 V reverse bias is limited by leakage current (0.25 µA max at 50 V), beyond which power dissipation exceeds safe limits.
How does thermal derating affect MMSZ5225BT1 performance above 75°C ambient?
Above 75°C, MMSZ5225BT1 power dissipation must be reduced by 6.7 mW per °C according to its derating curve. At 105°C ambient, maximum allowable power drops to 283 mW (500 − 6.7 × 30), directly reducing safe Zener current and clamping capability-designers must verify junction temperature stays below +150°C using RJA = 340°C/W.
Is MMSZ5225BT1 compatible with lead-free reflow soldering processes?
Yes-MMSZ5225BT1 is Pb-free and rated for peak reflow temperatures up to 260°C for 10 seconds, complying with IPC/JEDEC J-STD-020 moisture sensitivity level 1. Its SOD−123 package uses corrosion-resistant, easily solderable finish and void-free thermosetting plastic case optimized for automated assembly.
MMSZ5225BT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 3 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 29 Ohms
- Current - Reverse Leakage @ Vr:
- 50 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
MMSZ5225BT1 FAQ
1.How can I place an order for MMSZ5225BT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5225BT1 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 MMSZ5225BT1 reliable?
The price and inventory of MMSZ5225BT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5225BT1 is usually 5 days.
3.What payment methods are accepted for MMSZ5225BT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5225BT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5225BT1?
MMSZ5225BT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5225BT1 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 MMSZ5225BT1?
For technical support, including MMSZ5225BT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5225BT1 requirements.
6.How does Aetrix verify that MMSZ5225BT1 is sourced from the original manufacturer or authorized distributors?
All MMSZ5225BT1 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 MMSZ5225BT1 meets industry standards.
7.What is the process for return or replacement of MMSZ5225BT1?
All MMSZ5225BT1 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5225BT1, 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 MMSZ5225BT1 part is unused and in its original packaging.
Return procedure for MMSZ5225BT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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