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Diodes Incorporated MMSZ5231B-13-F
- Part No.:
- MMSZ5231B-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5231B-13-F.pdf
- Description:
- DIODE ZENER 5.1V 370MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:6,998
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Product details
Overview
MMSZ5231B-13-F from Diodes Incorporated is a 5.1 V, 20 mA nominal Zener diode in SOD-123 package with 17 Ω dynamic impedance at test current, 5.0 µA reverse leakage at 2.0 V, and 370 mW power dissipation at 25°C ambient. It serves as a precision voltage reference or overvoltage clamp in low-power analog circuits, DC-DC feedback loops, and microcontroller I/O protection.
For engineers reviewing the MMSZ5231B-13-F datasheet, MMSZ5231B-13-F pinout, MMSZ5231B-13-F application, or MMSZ5231B-13-F equivalent, key selection criteria include zener voltage tolerance (±5% at 4.85–5.36 V), thermal resistance (338 °C/W), cathode-band polarity marking, and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage regulation across varying load currents. Its 5.1 V nominal zener voltage exhibits a temperature coefficient near zero (≈0.02 %/°C) per Figure 6, making it suitable for temperature-stable references in industrial sensors and power supply feedback paths.
The device uses alloy-42 leadframe with matte tin plating and is packaged in halogen-free, RoHS-compliant green molding compound (UL 94V-0). It is rated for -65°C to +150°C operating temperature and meets J-STD-020 moisture sensitivity Level 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 5.1 V nominal, 4.85–5.36 V range at 20 mA - ensures tight regulation in 5 V rail monitoring and clamping |
| Power Dissipation (PD) | 370 mW at TA = 25°C - supports continuous operation in compact PCB layouts without forced cooling |
| Zener Impedance (ZZT) | 17 Ω at IZT = 20 mA - minimizes output voltage variation under dynamic load changes |
| Reverse Leakage (IR) | 5.0 µA max at VR = 2.0 V - enables low-quiescent-current biasing in battery-powered systems |
| Thermal Resistance (RθJA) | 338 °C/W - requires minimal copper area (1-inch pad on FR-4) for safe thermal management |
| Operating Temperature | -65°C to +150°C - qualified for under-hood automotive and industrial control environments |
Pinout & Package
Package: SOD-123 surface-mount plastic case with cathode band marking; dimensions: 2.65 mm × 1.55 mm × 1.05 mm (L × W × H); weight ≈ 0.01 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side in reverse-bias configuration; forms reference ground for shunt regulation |
| Cathode | Zener breakdown terminal / voltage clamp input | Marked by band; connected to higher-potential rail to enable controlled reverse conduction at 5.1 V |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW peak pulse power rating | Supports transient overvoltage suppression (e.g., ESD events) without degradation |
| AEC-Q101 qualification | Validated for automotive electronics including body control modules and infotainment power rails |
| Halogen- and antimony-free "Green" compound | Meets strict environmental compliance (Br+Cl <1500 ppm, Sb <1000 ppm) for global OEM programs |
| Solderable matte tin finish | Ensures reliable reflow attachment per MIL-STD-202 Method 208, compatible with lead-free processes |
Applications
| Automotive Body Control Module | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Voltage clamping on LIN bus transceiver I/O lines exposed to load-dump transients. IC Role / Device Role / Timing Role: Shunt regulator protecting transceiver inputs against >20 V surges while maintaining 5 V logic compatibility. Use Value: Prevents latch-up and permanent damage using only 17 Ω dynamic impedance and 5.1 V threshold-no external series resistor needed for basic protection. | Use Scenario: Precision 5 V reference for 12-bit ADC in temperature transmitter loop-powered design. IC Role / Device Role / Timing Role: Low-drift voltage reference source with <0.02 %/°C TC, replacing larger TL431-based circuits. Use Value: Enables ±0.5% full-scale accuracy over -40°C to +105°C with no trimming, reducing BOM count and calibration steps. |
| USB-C Power Delivery Monitor | IoT Node Battery Voltage Supervisor |
Use Scenario: Feedback voltage divider stabilization in buck converter supplying USB PD controller. IC Role / Device Role / Timing Role: Zener element in resistive divider to fix 5 V output setpoint despite input ripple and load variation. Use Value: Maintains ±1% output regulation under 10–100 mA load steps due to low 17 Ω ZZT, eliminating need for op-amp compensation. | Use Scenario: Low-power brown-out detection in BLE sensor node powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Reverse-biased reference enabling comparator trip at 2.8 V via resistor divider. Use Value: Draws only 5.0 µA leakage at 2.0 V, extending battery life beyond 5 years in sleep mode without compromising wake-up accuracy. |
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 nominal, but 300 mW PD and 40 Ω ZZT; SOD-323 package (smaller footprint) | Limited to lower-power signal-level clamping; unsuitable for >15 mA regulation loads | Select when board space is constrained and thermal budget allows reduced power handling |
| 1N5231B | Same electrical specs but DO-35 through-hole package; no AEC-Q101 qualification | Not approved for automotive use; requires wave-solder process and larger PCB real estate | Select for legacy prototyping or non-automotive industrial designs where manual assembly is acceptable |
Compared with BZX584C5V1 and 1N5231B, MMSZ5231B-13-F delivers superior thermal performance (338 °C/W vs. ~450 °C/W), tighter voltage tolerance (±5% vs. ±6%), and automotive qualification-making it optimal for high-reliability, surface-mount production of 5 V reference and clamp functions.
Availability
MMSZ5231B-13-F is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor signal conditioning, and IoT node battery supervision requiring stable component supply and long-term lifecycle support.
Supply support for MMSZ5231B-13-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 manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.
The MMSZ52xxB series belongs to Diodes' general-purpose Zener diode product line, engineered for cost-effective, high-volume voltage regulation and protection in automotive, industrial, and consumer electronics.
FAQ
What is the maximum reverse voltage this Zener can withstand before breakdown?
The MMSZ5231B-13-F has a nominal zener voltage of 5.1 V with a guaranteed range of 4.85 V to 5.36 V at 20 mA test current. Breakdown occurs within this range under reverse bias; it is not rated for sustained operation above 5.36 V without exceeding specified power limits or risking parametric shift.
Is this part suitable for use in a 12 V automotive system?
Yes-MMSZ5231B-13-F is AEC-Q101 qualified and rated for -65°C to +150°C operation. In a 12 V system, it functions reliably as a 5.1 V clamp or reference when used with appropriate series current limiting, and its green molding compound ensures compliance with automotive environmental standards.
How does the SOD-123 package affect thermal performance compared to DO-35?
The SOD-123 package offers lower thermal resistance to ambient (338 °C/W on FR-4 with 1-inch pad) than DO-35 (typically >500 °C/W), enabling higher continuous power dissipation in surface-mount layouts. Its smaller footprint also improves PCB density and automated placement yield.
Can this Zener replace a TL431 in feedback circuits?
No-it lacks the adjustable reference and op-amp functionality of TL431. However, MMSZ5231B-13-F serves as a fixed 5.1 V shunt reference in simple feedback dividers where precision and low cost are prioritized over programmability or sink current capability.
MMSZ5231B-13-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:
- 370 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-13-F FAQ
1.How can I place an order for MMSZ5231B-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5231B-13-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-13-F reliable?
The price and inventory of MMSZ5231B-13-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-13-F is usually 5 days.
3.What payment methods are accepted for MMSZ5231B-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5231B-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5231B-13-F?
MMSZ5231B-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5231B-13-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-13-F?
For technical support, including MMSZ5231B-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5231B-13-F requirements.
6.How does Aetrix verify that MMSZ5231B-13-F is sourced from the original manufacturer or authorized distributors?
All MMSZ5231B-13-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-13-F meets industry standards.
7.What is the process for return or replacement of MMSZ5231B-13-F?
All MMSZ5231B-13-F units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5231B-13-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-13-F part is unused and in its original packaging.
Return procedure for MMSZ5231B-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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