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Diodes Incorporated MMSZ5252B-7
- Part No.:
- MMSZ5252B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5252B-7.pdf
- Description:
- DIODE ZENER 24V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:6,233
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Product details
Overview
MMSZ5252B-7 from Diodes Incorporated is a 24 V, 5.2 mA nominal Zener diode in SOD123 package, rated for 500 mW power dissipation at TL = +75°C and 370 mW at TA = +25°C, with 33 Ω typical Zener impedance at test current and 0.1 µA reverse leakage at 18 V, widely used for voltage regulation and reference in low-power analog circuits.
For engineers reviewing the MMSZ5252B-7 datasheet, MMSZ5252B-7 pinout, MMSZ5252B-7 application, or MMSZ5252B-7 equivalent, key selection criteria include nominal Zener voltage tolerance (±5%), thermal resistance (338 °C/W), cathode-band polarity marking, SOD123 footprint compatibility, and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage across its terminals under varying load or supply conditions. Its 24 V nominal Zener voltage is specified at 5.2 mA test current, with 33 Ω dynamic impedance measured at 1 kHz, ensuring predictable regulation performance in feedback and reference paths.
The device features a cathode-band polarity indicator, matte tin-plated Alloy 42 leadframe, and green molding compound compliant with halogen- and antimony-free standards. It is qualified to AEC-Q101, supporting operation from –65 °C to +150 °C with moisture sensitivity level 1 per J-STD-020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 24 V (min 22.8 V, max 25.2 V at IZT = 5.2 mA - defines regulation setpoint in voltage-reference circuits) |
| Power Dissipation | 370 mW at TA = +25°C (limits continuous current to ~15.4 mA at 24 V - constrains use in low-power biasing) |
| Zener Impedance | 33 Ω at f = 1 kHz, IZT = 5.2 mA (determines AC regulation stiffness - lower values improve ripple rejection) |
| Reverse Leakage Current | 0.1 µA at VR = 18 V (ensures minimal quiescent error in high-impedance reference nodes) |
| Thermal Resistance | 338 °C/W junction-to-ambient (requires thermal pad design on FR-4 PCB to sustain full 500 mW at TL = +75°C) |
| Operating Temperature | –65 °C to +150 °C (supports under-hood automotive and industrial environments without derating) |
Pinout & Package
Package: SOD123 surface-mount plastic case with cathode band marking; dimensions: L = 0.25–0.40 mm, D = 1.40–1.70 mm, E = 2.55–2.85 mm, He = 3.55–3.85 mm; weight ≈ 0.01 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener reference ground node | Connected to circuit common or low-side reference point; forms return path during reverse-bias regulation |
| Cathode | Reverse-bias voltage output terminal | Provides regulated 24 V output when biased above breakdown; marked by visible band on package body |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control modules and body electronics requiring high-reliability discrete components |
| Green molding compound | Halogen- and antimony-free (<900 ppm Br/Cl, <1000 ppm Sb) - meets RoHS 2 and automotive environmental compliance mandates |
| SOD123 footprint | Standardized 2-pin surface-mount outline compatible with automated pick-and-place and reflow processes - reduces assembly cost |
| Low leakage at sub-Zener voltage | 0.1 µA @ 18 V enables precision biasing in high-impedance op-amp reference networks without loading error |
Applications
| Automotive Sensor Reference | Industrial Analog Front-End |
|---|---|
Use Scenario: Providing stable 24 V reference for pressure and temperature sensor signal conditioning in engine bay modules. IC Role / Device Role / Timing Role: Voltage reference element in ratiometric ADC bias network and op-amp gain-setting circuit. Use Value: Tight ±5% Zener tolerance and –65 °C to +150 °C operation ensure consistent sensor calibration across extreme ambient conditions. |
Use Scenario: Regulating bias voltage for isolated 4–20 mA transmitter ICs in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Low-power shunt regulator establishing precise 24 V rail for current-loop driver stage. Use Value: 33 Ω Zener impedance minimizes output variation under load transients, improving loop accuracy to ±0.1%. |
| Consumer Power Supply Feedback | Medical Instrument Calibration |
Use Scenario: Secondary-side voltage sensing in flyback converters for USB-C PD adapters and wall chargers. IC Role / Device Role / Timing Role: Zener-based feedback node for optocoupler-coupled regulation loop. Use Value: 370 mW power rating supports direct connection to TL431 reference input without series resistor, simplifying layout. |
Use Scenario: Precision voltage reference in portable blood glucose meter analog front-end calibration circuitry. IC Role / Device Role / Timing Role: Stable DC reference source for ADC offset correction and DAC output trimming. Use Value: 0.1 µA reverse leakage at 18 V prevents drift in high-impedance calibration nodes, maintaining ±0.05% measurement linearity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584-C24 (Nexperia) | Same 24 V nominal, but 300 mW PD at TA = +25°C and 200 Ω ZZT - higher impedance, lower power handling | Not AEC-Q101 qualified; suitable only for commercial-grade consumer power supplies | Select when cost is primary constraint and automotive qualification is unnecessary |
| 1N5252B (ON Semiconductor) | Same 24 V nominal, but DO-35 through-hole package and 500 mW rating at TA = +25°C - larger footprint, no SMT compatibility | Requires manual or wave soldering; incompatible with high-density PCB layouts | Select only for legacy through-hole designs or prototyping where rework flexibility outweighs size constraints |
Compared with BZX584-C24 and 1N5252B, MMSZ5252B-7 uniquely combines AEC-Q101 qualification, SOD123 surface-mount compatibility, and 33 Ω low-impedance regulation - making it optimal for space-constrained, high-reliability automotive and industrial systems requiring stable 24 V references.
Availability
MMSZ5252B-7 is available at Aetrix Electronics and suitable for automotive sensor modules, industrial 4–20 mA transmitters, consumer power supply feedback circuits, and medical instrument calibration requiring stable component supply and traceable sourcing.
Supply support for MMSZ5252B-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, manufacturing, and sales operations across Asia, Europe, and North America.
MMSZ5252B-7 belongs to the MMSZ52xxB family of 500 mW Zener diodes engineered for general-purpose voltage regulation and reference in automotive, industrial, and consumer applications where AEC-Q101 reliability and SMT manufacturability are essential.
FAQ
What is the maximum continuous Zener current for MMSZ5252B-7 at room temperature?
At TA = +25°C, the maximum continuous Zener current is approximately 15.4 mA, calculated from PD = 370 mW and VZ = 24 V. This assumes no additional board-level thermal enhancement; actual usable current decreases with rising ambient temperature per the derating curve in Figure 1.
Is MMSZ5252B-7 suitable for use in high-frequency noise suppression?
No - this device is not optimized for RF or high-frequency bypass. Its typical capacitance is ~15 pF at 0 V (inferred from Figure 4), and Zener impedance rises sharply above 1 kHz. For noise suppression, TVS diodes or ceramic capacitors are preferred; MMSZ5252B-7 is intended for DC/low-frequency voltage regulation only.
How does the cathode band orientation affect PCB layout?
The cathode band must align with the PCB's designated cathode pad (typically marked "K" or shaded). Incorrect orientation results in forward conduction instead of Zener regulation - causing excessive current draw and potential failure. The SOD123 top view shows the band adjacent to the smaller end of the package, matching standard Diodes Incorporated marking conventions.
Does MMSZ5252B-7 require external heat sinking in typical applications?
No external heatsink is required. When mounted on an FR-4 PCB with a 1-inch copper pad (per Note 5), the device sustains full 500 mW at TL = +75°C. For 370 mW operation at TA = +25°C, standard 0.5 oz copper traces suffice. Thermal performance degrades significantly without adequate copper area beneath the SOD123 pads.
MMSZ5252B-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):
- 24 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 33 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 18 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
MMSZ5252B-7 FAQ
1.How can I place an order for MMSZ5252B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5252B-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 MMSZ5252B-7 reliable?
The price and inventory of MMSZ5252B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5252B-7 is usually 5 days.
3.What payment methods are accepted for MMSZ5252B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5252B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5252B-7?
MMSZ5252B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5252B-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 MMSZ5252B-7?
For technical support, including MMSZ5252B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5252B-7 requirements.
6.How does Aetrix verify that MMSZ5252B-7 is sourced from the original manufacturer or authorized distributors?
All MMSZ5252B-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 MMSZ5252B-7 meets industry standards.
7.What is the process for return or replacement of MMSZ5252B-7?
All MMSZ5252B-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5252B-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 MMSZ5252B-7 part is unused and in its original packaging.
Return procedure for MMSZ5252B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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