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Diodes Incorporated MMSZ5231B-7
- Part No.:
- MMSZ5231B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5231B-7.pdf
- Description:
- DIODE ZENER 5.1V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:6,976
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Product details
Overview
MMSZ5231B-7 from Diodes Incorporated is a 500mW surface-mount Zener diode with nominal zener voltage 5.1V (4.85–5.36V range), 20mA test current, 17Ω zener impedance at IZT, and 5.0μA reverse leakage at 2.0V. It serves as a precision voltage reference or overvoltage clamp in low-power analog and digital supply regulation circuits.
For engineers reviewing the MMSZ5231B-7 datasheet, MMSZ5231B-7 pinout, MMSZ5231B-7 application, or MMSZ5231B-7 equivalent, this device is selected for stable 5V rail stabilization, ESD-protected signal-level clamping, and compact voltage reference design where SOD123 footprint and AEC-Q101 qualification are required.
Technical Context
This Zener diode operates in reverse breakdown to maintain a stable reference voltage across its terminals under controlled current conditions. Its 17Ω dynamic impedance at 20mA ensures minimal voltage deviation with load current changes, and its 5.0μA leakage at 2.0V supports low-power standby operation.
The device uses a silicon PN junction fabricated in a SOD123 plastic package with matte tin-plated alloy 42 leads, cathode band polarity marking, and UL 94V-0 flammability rating. It is qualified to AEC-Q101 for automotive-grade reliability and rated for -65°C to +150°C operating temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (Nominal) | 5.1 V - Stable reference point for 5V system biasing and regulation |
| Zener Voltage Range | 4.85–5.36 V - Tolerance band defining usable accuracy without trimming |
| Test Current (IZT) | 20 mA - Standard bias condition for guaranteed VZ specification |
| Zener Impedance (ZZT) | 17 Ω - Low dynamic resistance enabling tight regulation under varying load |
| Power Dissipation (TA=25°C) | 370 mW - Maximum continuous power on FR-4 PCB with 1-inch copper pad |
| Reverse Leakage (IR @ VR=2.0V) | 5.0 μA - Minimal off-state current critical for battery-powered sensing nodes |
| Thermal Resistance (RθJA) | 338 °C/W - Limits junction temperature rise in ambient-constrained layouts |
Pinout & Package
Package: SOD123 - Surface-mount plastic case with cathode band marking; dimensions: 1.55mm × 2.65mm × 1.05mm (L × W × H); weight ≈ 0.01g; RoHS-compliant, halogen-free, AEC-Q101 qualified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reverse breakdown cathode reference | Connected to lower-potential node in clamp/reference configuration |
| Cathode | Zener breakdown terminal / Voltage reference output | Provides stable 5.1V relative to anode when reverse-biased ≥2.0V |
Key Features
| Feature | Design Value |
|---|---|
| 500mW Power Dissipation (TL=75°C) | Enables use in higher-temperature environments with derated board layout |
| AEC-Q101 Qualified | Validated for automotive electronics including infotainment power rails and sensor interfaces |
| SOD123 Footprint | Standardized 2-pin SMT package compatible with high-speed pick-and-place assembly |
| Lead-Free & Halogen-Free | Meets global environmental compliance (RoHS 2, JEDEC J-STD-020 Level 1) |
Applications
| Industrial Sensor Signal Conditioning | Automotive Body Control Module (BCM) Voltage Clamp |
|---|---|
Use Scenario: Stabilizing reference voltage for 12-bit ADC inputs in temperature/humidity transmitters. IC Role / Device Role / Timing Role: Zener voltage reference providing 5.1V bias to op-amp input stage and ADC reference divider. Use Value: 17Ω impedance minimizes code shift across 0–15mA sensor loop current variation. | Use Scenario: Clamping LIN bus node supply against load-dump transients up to 40V. IC Role / Device Role / Timing Role: Reverse-biased protection diode shunting excess energy to ground during ISO 7637-2 pulse 5a events. Use Value: 5.0μA leakage at 2.0V prevents false wake-up in sleep-mode BCM microcontrollers. |
| USB-C Power Delivery Monitor Reference | Smart Home IoT Node Battery Protection |
Use Scenario: Providing accurate 5.1V reference for voltage monitoring ICs in PD sink controllers. IC Role / Device Role / Timing Role: Precision voltage source feeding comparator threshold in VBUS fault detection circuitry. Use Value: 4.85–5.36V tolerance ensures reliable trip point across production lots and temperature. | Use Scenario: Regulating charging IC feedback voltage in coin-cell–powered BLE sensors. IC Role / Device Role / Timing Role: Low-leakage shunt regulator maintaining stable 5.1V for LDO enable logic and MCU brown-out detection. Use Value: 370mW dissipation allows sustained operation at 10mA without thermal shutdown in sealed enclosures. |
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 5.1V nominal, but 300mW PD (TA=25°C), 40Ω ZZT, SOD523 package | Lower power handling and higher impedance limit use in high-current reference paths | Select when board space is constrained and 5.1V accuracy >5% is acceptable |
| MMBZ5231BS | Same 5.1V, 200mW PD, 17Ω ZZT, SOT-23 package, dual-anode configuration | Requires different PCB layout and lacks AEC-Q101 qualification | Select for cost-sensitive consumer designs where automotive qualification is unnecessary |
Compared with BZX584C5V1 and MMBZ5231BS, MMSZ5231B-7 delivers superior thermal robustness (370mW), tighter regulation (17Ω), and automotive-grade reliability-making it optimal for industrial and automotive voltage reference and clamping where long-term stability and transient resilience are critical.
Availability
MMSZ5231B-7 is available at Aetrix Electronics and suitable for industrial sensor conditioning, automotive body control modules, and USB-C power delivery monitor circuits requiring stable component supply and AEC-Q101 compliance.
Supply support for MMSZ5231B-7 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.
MMSZ5231B-7 belongs to the MMSZ52xxB series of general-purpose Zener diodes designed for medium-current voltage regulation and clamping in space-constrained, high-reliability applications including automotive, industrial, and computing systems.
FAQ
What is the maximum reverse voltage before breakdown for MMSZ5231B-7?
The nominal zener voltage is 5.1V, with a guaranteed breakdown range of 4.85V to 5.36V at 20mA test current. Breakdown occurs sharply above ~4.85V in reverse bias; operation below this voltage yields only leakage current ≤5.0μA at 2.0V.
Can MMSZ5231B-7 be used in place of a 5V linear regulator?
No-it is a two-terminal shunt regulator, not a three-terminal series regulator. It requires a series current-limiting resistor and cannot source load current. It is appropriate only for low-current reference or clamping, not for powering loads directly.
Is the SOD123 package lead-free and RoHS compliant?
Yes-MMSZ5231B-7 uses matte tin finish over alloy 42 leadframe, contains no intentionally added lead, and meets EU Directive 2011/65/EU (RoHS 2). It is also halogen- and antimony-free per Diodes Incorporated's "Green" definition.
What is the thermal derating behavior above 25°C ambient?
Power dissipation must be linearly derated above 25°C at 3.7mW/°C (based on RθJA = 338°C/W). At 75°C ambient, maximum allowable power drops to 500mW (per junction-to-lead spec), requiring careful PCB copper area design to avoid exceeding TJ = 150°C.
MMSZ5231B-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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 FAQ
1.How can I place an order for MMSZ5231B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5231B-7 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 reliable?
The price and inventory of MMSZ5231B-7 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 is usually 5 days.
3.What payment methods are accepted for MMSZ5231B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5231B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5231B-7?
MMSZ5231B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5231B-7 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?
For technical support, including MMSZ5231B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5231B-7 requirements.
6.How does Aetrix verify that MMSZ5231B-7 is sourced from the original manufacturer or authorized distributors?
All MMSZ5231B-7 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 meets industry standards.
7.What is the process for return or replacement of MMSZ5231B-7?
All MMSZ5231B-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5231B-7, 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 part is unused and in its original packaging.
Return procedure for MMSZ5231B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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