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Diodes Incorporated MMSZ5231B-7-F
- Part No.:
- MMSZ5231B-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5231B-7-F.pdf
- Description:
- DIODE ZENER 5.1V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:354,313
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Product details
Overview
MMSZ5231B-7-F from Diodes Incorporated is a 500mW surface-mount Zener diode with a nominal zener voltage of 5.1V (4.85–5.36V range), 20mA test current, and 17Ω dynamic impedance at 20mA. It features SOD123 packaging, AEC-Q101 qualification for automotive reliability, and is used for precision voltage regulation and overvoltage protection in low-power DC rails.
For engineers reviewing the MMSZ5231B-7-F datasheet, MMSZ5231B-7-F pinout, MMSZ5231B-7-F application, or MMSZ5231B-7-F equivalent, key selection criteria include zener voltage tolerance, power derating behavior above +75°C, thermal resistance (338°C/W), and compliance with halogen/antimony-free "Green" standards.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable reference voltage under varying load and temperature conditions. Its 17Ω zener impedance at 20mA and low 5.0μA reverse leakage at 2.0V ensure tight regulation in feedback loops and sensing circuits.
The device uses alloy 42 leadframe with matte tin plating, rated for solderability per MIL-STD-202, Method 208, and exhibits a typical temperature coefficient near zero for 5.1V variants-critical for stable biasing in analog front-ends and sensor interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 5.1V nominal (4.85–5.36V min/max); enables accurate 5V rail clamping or reference generation |
| Power Dissipation | 370mW @ TA=+25°C; limits continuous current to ~73mA at 5.1V without heatsinking |
| Zener Impedance | 17Ω @ IZT=20mA; ensures <0.34V output variation for ±2mA load shifts |
| Reverse Leakage | 5.0μA @ VR=2.0V; minimizes quiescent current in high-impedance bias networks |
| Thermal Resistance | 338°C/W junction-to-ambient; requires PCB copper area management for >100mW operation |
| Package | SOD123; 1.55mm width × 2.65mm length × 0.30mm height; compatible with standard 0805 reflow profiles |
Pinout & Package
Two-terminal SOD123 package with cathode band marking; anode and cathode terminals are unidirectional and polarity-critical for proper reverse-bias operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to system GND or lowest potential point in regulation path |
| Cathode | Zener voltage output node | Provides regulated 5.1V when reverse-biased; must be connected to supply rail via current-limiting resistor |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HAST, and mechanical shock |
| Halogen & antimony free | Meets <900ppm Br, <900ppm Cl, <1000ppm Sb; supports RoHS 2 and ELV compliance |
| Lead-free plating | Matte tin over alloy 42; ensures solder joint integrity and avoids Pb contamination in assembly |
| Automated assembly compatible | SOD123 footprint and tape-and-reel packaging support high-speed pick-and-place placement |
Applications
| USB Power Monitoring | Industrial Sensor Biasing |
|---|---|
Use Scenario: Monitoring 5V USB VBUS for overvoltage detection in portable docking stations. IC Role / Device Role / Timing Role: Zener clamp protecting downstream supervisor ICs from transient overvoltage events. Use Value: 5.1V threshold ensures detection before 5.5V absolute maximum rating of USB interface ICs is exceeded. | Use Scenario: Providing stable bias voltage to bridge-based pressure sensors in factory automation modules. IC Role / Device Role / Timing Role: Low-drift reference source for Wheatstone bridge excitation. Use Value: <5.0μA leakage and 17Ω impedance minimize offset error and improve measurement resolution. |
| Automotive ECU Reset Circuit | Low-Power IoT Node Regulation |
Use Scenario: Generating clean reset signal during cold-crank battery dips in engine control units. IC Role / Device Role / Timing Role: Zener-regulated voltage input to reset supervisor IC with hysteresis. Use Value: AEC-Q101 qualification ensures operation across –40°C to +125°C ambient and withstands load dump transients. | Use Scenario: Regulating 3.3V rail from coin-cell-supplied 5V boost converter in wireless sensor nodes. IC Role / Device Role / Timing Role: Shunt regulator maintaining stable voltage during intermittent transmit bursts. Use Value: 370mW rating allows sustained 70mA shunt current, supporting peak RF power amplifier loads without rail collapse. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C5V1 | Same 5.1V nominal, but 300mW rating and SOD323 package; higher ZZT (40Ω) | Limited to lower-power signal-level clamping; not AEC-Q101 qualified | Select when board space is constrained and automotive qualification is unnecessary |
| 1N4733A | Through-hole DO-41 package; 1W rating; wider VZ tolerance (4.8–5.4V); no RoHS/Green compliance | Requires manual insertion; unsuitable for automated production or modern environmental compliance | Select only for legacy repair or non-RoHS prototyping where thermal margin exceeds 500mW |
Compared with BZX584C5V1 and 1N4733A, MMSZ5231B-7-F delivers superior thermal performance in SMT layouts, guaranteed automotive reliability, and tighter voltage tolerance-making it optimal for volume-manufactured, safety-conscious embedded systems.
Availability
MMSZ5231B-7-F is available at Aetrix Electronics and suitable for USB power monitoring, industrial sensor biasing, automotive ECU reset circuits, and low-power IoT node regulation requiring stable component supply and full RoHS/Green compliance.
Supply support for MMSZ5231B-7-F 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
Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal devices, with design centers across Asia, Europe, and the U.S., serving industrial, computing, consumer, and automotive markets.
The MMSZ52xxB series belongs to Diodes' general-purpose Zener diode product line, engineered for cost-effective, high-reliability voltage regulation in space-constrained surface-mount applications.
FAQ
What is the maximum continuous reverse current this Zener can handle at room temperature?
At TA = +25°C, the MMSZ5231B-7-F supports up to 73mA continuous reverse current (370mW ÷ 5.1V), assuming adequate PCB copper area for heat dissipation. Derating begins linearly above +75°C, reaching zero power at +150°C per the published curve.
Does this part have a specified temperature coefficient for its zener voltage?
Yes-the MMSZ5231B exhibits a near-zero temperature coefficient (~0.02%/°C) around 5.1V, as shown in Figure 6 of DS18010 Rev. 28. This minimizes drift across –65°C to +150°C operating range, critical for precision analog references.
Can this Zener diode be used in place of a TVS for ESD protection?
No-it is not rated for ESD or surge immunity. With 17Ω dynamic impedance and 500mW peak power, it lacks the low clamping voltage and high transient energy handling of dedicated TVS diodes like the DZ23C5V1 series.
Is the SOD123 package compatible with standard 0805 footprint land patterns?
Not directly-SOD123 measures 1.55mm × 2.65mm, while 0805 is 2.0mm × 1.25mm. The recommended pad layout (X=0.90mm, X1=4.05mm, Y=0.95mm) differs significantly; using 0805 pads risks tombstoning or insufficient solder fillet on the longer dimension.
MMSZ5231B-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
MMSZ5231B-7-F FAQ
1.How can I place an order for MMSZ5231B-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5231B-7-F 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 MMSZ5231B-7-F reliable?
The price and inventory of MMSZ5231B-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5231B-7-F is usually 5 days.
3.What payment methods are accepted for MMSZ5231B-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5231B-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5231B-7-F?
MMSZ5231B-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5231B-7-F 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 MMSZ5231B-7-F?
For technical support, including MMSZ5231B-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5231B-7-F requirements.
6.How does Aetrix verify that MMSZ5231B-7-F is sourced from the original manufacturer or authorized distributors?
All MMSZ5231B-7-F 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 MMSZ5231B-7-F meets industry standards.
7.What is the process for return or replacement of MMSZ5231B-7-F?
All MMSZ5231B-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5231B-7-F, 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 MMSZ5231B-7-F part is unused and in its original packaging.
Return procedure for MMSZ5231B-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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