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onsemi MMSZ5231BT3
- Part No.:
- MMSZ5231BT3
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5231BT3.pdf
- Description:
- DIODE ZENER 5.1V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:3,311
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Product details
Overview
MMSZ5231BT3 from onsemi is a 5.1 V ±5% Zener diode in SOD−123 package, rated for 500 mW power dissipation at 75°C ambient, with 17 Ω dynamic impedance at 20 mA test current and 0.25 µA leakage at 2 V reverse bias. It serves as a precision voltage reference or overvoltage clamp in low-power analog circuits, power supply feedback loops, and microcontroller I/O protection.
For engineers reviewing the MMSZ5231BT3 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal derating behavior, SOD−123 terminal mapping, and validated alternative parts for voltage regulation design-in.
Technical Context
The MMSZ5231BT3 operates as a silicon planar Zener diode with avalanche breakdown mechanism, specified under thermal equilibrium conditions (TL = 30°C ±1°C). Its nominal Zener voltage of 5.1 V is measured at IZT = 20 mA with VF ≤ 0.95 V at IF = 10 mA.
It exhibits a temperature coefficient of +2.0 mV/°C near 5.1 V, junction-to-ambient thermal resistance of 340°C/W, and ESD robustness exceeding 16 kV per Human Body Model. The device is Pb−Free, AEC−Q101 qualified, and rated for −55°C to +150°C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.85–5.36 V @ IZT = 20 mA - defines stable regulation window for 5 V rail clamping or reference |
| Power Dissipation (PD) | 500 mW @ TL = 75°C - sets maximum continuous DC power before thermal derating begins |
| Zener Impedance (ZZT) | 17 Ω @ IZT = 20 mA - indicates low AC impedance for stable regulation under varying load |
| Leakage Current (IR) | 0.25 µA @ VR = 2 V - ensures minimal quiescent current draw in standby mode |
| Junction Temp Range | −55°C to +150°C - supports operation in automotive under-hood and industrial control environments |
| ESD Rating | Class 3 (>16 kV HBM) - provides robust handling during board assembly and end-use I/O exposure |
| Package | SOD−123 (Case 425) - surface-mount footprint compatible with automated pick-and-place and reflow |
Pinout & Package
SOD−123 package: 2-terminal surface-mount plastic case with cathode band marking; dimensions 2.84 mm × 1.35 mm × 0.94 mm (L × W × H), 0.25 mm lead thickness, UL 94 V−0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Zener anode connection point | Connected to regulated voltage node; reverse-biased during regulation; polarity band identifies this terminal |
| 2 (Anode) | Zener cathode connection point | Typically tied to ground or lower-potential rail; completes reverse-bias path for Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW FR−5 board rating | Enables use in space-constrained PCBs without external heatsinking at moderate ambient temperatures |
| ±5% Zener tolerance | Provides predictable 4.85–5.36 V regulation band suitable for non-critical 5 V reference applications |
| 17 Ω dynamic impedance | Minimizes output voltage variation under ±5 mA load transients in feedback networks |
| AEC−Q101 qualification | Validates reliability for automotive body electronics, infotainment power rails, and sensor interfaces |
| Pb−Free construction | Meets RoHS Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 1 |
Applications
| Microcontroller I/O Protection | 5 V Power Supply Feedback |
|---|---|
Use Scenario: Clamping GPIO pins against ESD or transient overvoltage in embedded systems. IC Role / Device Role / Timing Role: Zener diode acting as shunt overvoltage protector between I/O line and ground. Use Value: Limits voltage to ≤5.36 V during transients while drawing <0.25 µA at 2 V, preserving MCU input integrity. | Use Scenario: Providing stable reference voltage to optocoupler feedback circuit in isolated DC/DC converters. IC Role / Device Role / Timing Role: Precision Zener reference setting error amplifier trip point in secondary-side regulation loop. Use Value: Maintains 4.85–5.36 V reference across −40°C to +125°C with <2 mV/°C drift, ensuring tight output voltage tolerance. |
| Low-Power Sensor Biasing | Industrial Analog Signal Conditioning |
Use Scenario: Generating stable 5.1 V bias for analog front-end op-amps in battery-powered sensors. IC Role / Device Role / Timing Role: Passive voltage reference source replacing active regulators where ultra-low quiescent current is critical. Use Value: Delivers regulation with only 0.25 µA leakage at 2 V reverse bias, extending battery life in always-on monitoring nodes. | Use Scenario: Protecting ADC inputs from overvoltage in programmable logic controller (PLC) analog modules. IC Role / Device Role / Timing Role: Input clamp limiting signal swing to safe levels before conditioning amplifiers. Use Value: Withstands 16 kV HBM ESD events and regulates within 17 Ω impedance, preventing ADC saturation or damage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMSZ5231BT1G | Same electrical specs, 3,000-piece tape-and-reel vs. 10,000-piece for MMSZ5231BT3 | Identical performance; suited for prototyping or low-volume production runs | Select when smaller reel quantities align with build planning or inventory constraints |
| BZX584C5V1 | 5.1 V ±5%, 300 mW rating, SOD-323 package, 40 Ω ZZT @ 5 mA | Lower power rating and higher impedance limit use to sub-10 mA loads and less demanding regulation | Choose only if SOD-323 footprint is required and 300 mW/40 Ω performance suffices |
Compared with MMSZ5231BT3, MMSZ5231BT1G offers identical regulation performance in a smaller reel format, while BZX584C5V1 trades 500 mW capability and 17 Ω impedance for a smaller SOD-323 footprint-making MMSZ5231BT3 optimal for higher-power, lower-impedance 5 V reference needs.
Availability
MMSZ5231BT3 is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC analog I/O, and battery-powered sensor nodes requiring stable component supply and long-term lifecycle support.
Supply support for MMSZ5231BT3 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier delivering energy-efficient, high-performance silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
The MMSZ52xxxT1G series is designed for general-purpose, medium-current Zener regulation in compact surface-mount applications-emphasizing thermal stability, AEC−Q101 compliance, and high-density PCB integration.
FAQ
What is the Zener voltage tolerance for MMSZ5231BT3?
The MMSZ5231BT3 has a ±5% Zener voltage tolerance, resulting in a guaranteed regulation range of 4.85 V to 5.36 V at IZT = 20 mA and thermal equilibrium (TL = 30°C ±1°C). This tolerance is confirmed in the "5% TOLERANCE FG ELECTRICAL CHARACTERISTICS" table on page 3 of the official datasheet. The MMSZ5231BT3 is not rated for tighter tolerances unless explicitly marked with a 'C' suffix (e.g., MMSZ5231CT3G).
Does MMSZ5231BT3 require a heatsink in standard PCB layouts?
No, the MMSZ5231BT3 does not require an external heatsink when mounted on FR-4 or FR-5 boards using the recommended minimum footprint. Its 500 mW power rating is specified at TL = 75°C with 340°C/W junction-to-ambient thermal resistance. Derating begins above 75°C at 6.7 mW/°C, so full-rated power is achievable up to 75°C ambient with standard copper pour. The MMSZ5231BT3's SOD−123 package is thermally optimized for direct board conduction.
What is the maximum reverse leakage current for MMSZ5231BT3 at 2 V?
The maximum reverse leakage current for MMSZ5231BT3 at VR = 2 V is 0.25 µA, as specified in the "5% TOLERANCE FG ELECTRICAL CHARACTERISTICS" table (page 3). This value is measured at TA = 25°C and applies across the full operating temperature range. The MMSZ5231BT3 maintains this low leakage even at elevated temperatures, supporting energy-sensitive applications like battery-backed sensors.
Is MMSZ5231BT3 suitable for automotive applications?
Yes, MMSZ5231BT3 is AEC−Q101 qualified and PPAP capable, making it suitable for automotive applications including body electronics, infotainment power rails, and sensor interfaces. Its −55°C to +150°C junction temperature range, 16 kV HBM ESD rating, and Pb−Free construction meet automotive reliability and compliance requirements. The MMSZ5231BT3 is also available in SZ-prefix variants (e.g., SZMMSZ5231BT3G) for applications requiring additional site-specific controls.
How does the Zener impedance of MMSZ5231BT3 affect regulation accuracy?
The MMSZ5231BT3 has a maximum Zener impedance (ZZT) of 17 Ω at IZT = 20 mA, meaning a 1 mA change in Zener current causes ≤17 mV output variation. This low impedance ensures stable regulation under dynamic load conditions in feedback networks or reference circuits. At lower currents (e.g., IZK = 0.25 mA), ZZK rises to 1600 Ω-so MMSZ5231BT3 must be biased above ~5 mA for effective regulation. Designers should verify operating current margins in their specific circuit.
MMSZ5231BT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 5.1 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 17 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 2 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
MMSZ5231BT3 FAQ
1.How can I place an order for MMSZ5231BT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5231BT3 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 MMSZ5231BT3 reliable?
The price and inventory of MMSZ5231BT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5231BT3 is usually 5 days.
3.What payment methods are accepted for MMSZ5231BT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5231BT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5231BT3?
MMSZ5231BT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5231BT3 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 MMSZ5231BT3?
For technical support, including MMSZ5231BT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5231BT3 requirements.
6.How does Aetrix verify that MMSZ5231BT3 is sourced from the original manufacturer or authorized distributors?
All MMSZ5231BT3 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 MMSZ5231BT3 meets industry standards.
7.What is the process for return or replacement of MMSZ5231BT3?
All MMSZ5231BT3 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5231BT3, 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 MMSZ5231BT3 part is unused and in its original packaging.
Return procedure for MMSZ5231BT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMSZ5231BT3 Tags
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