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Diodes Incorporated MMSZ5256B-7-F
- Part No.:
- MMSZ5256B-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5256B-7-F.pdf
- Description:
- DIODE ZENER 30V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:16,038
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Product details
Overview
MMSZ5256B-7-F from Diodes Incorporated is a 30V, 4.2mA nominal Zener diode in SOD-123 package, rated for 500mW power dissipation at TL=75°C and 370mW at TA=25°C, with 49Ω dynamic impedance at test current and 0.1μA reverse leakage at 23V, widely used for voltage regulation and reference in low-power analog circuits.
For engineers reviewing the MMSZ5256B-7-F datasheet, MMSZ5256B-7-F pinout, MMSZ5256B-7-F application, or MMSZ5256B-7-F equivalent, key selection criteria include Zener voltage tolerance (±5% at 30V), thermal resistance (338°C/W), cathode-band polarity marking, RoHS-compliant green molding compound, and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable voltage across load variations, with specified test current of 4.2mA and knee current of 0.25mA. Its temperature coefficient is +0.07%/°C (typical for 30V devices per Figure 6), enabling predictable drift compensation in precision references.
The device uses alloy 42 leadframe with matte tin plating, solderable per MIL-STD-202 Method 208, and features moisture sensitivity level 1 per J-STD-020 - suitable for standard reflow without baking. Package dimensions conform to JEDEC SOD-123 outline with 2.65mm body width and 3.65mm height.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 30V nominal, 28.5–31.5V range at 4.2mA - ensures ±5% regulation tolerance in feedback loops |
| Power Dissipation | 370mW at 25°C ambient - defines maximum continuous DC power before thermal derating |
| Zener Impedance | 49Ω at 1kHz, 4.2mA - determines AC regulation stability under varying load transients |
| Reverse Leakage | 0.1μA at 23V - guarantees minimal quiescent current in high-impedance bias networks |
| Thermal Resistance | 338°C/W junction-to-ambient - sets temperature rise per watt on FR-4 PCB with 1-inch copper pad |
| Package | SOD-123 - surface-mount footprint compatible with automated pick-and-place and reflow |
| Qualification | AEC-Q101 qualified - validated for automotive under-hood applications requiring high-reliability operation |
Pinout & Package
Two-terminal device in SOD-123 package: anode and cathode marked by molded band on cathode end. Case material is halogen-free green molding compound (UL 94V-0 rated), weight ≈0.01g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in reverse-biased Zener configuration |
| Cathode | Reverse breakdown terminal | Marked with band; connected to regulated output node in shunt regulator topology |
Key Features
| Feature | Design Value |
|---|---|
| 500mW power rating at TL = 75°C | Enables higher transient power handling than standard 300mW Zeners in thermally constrained layouts |
| AEC-Q101 qualification | Validated for automotive applications including engine control modules and body electronics |
| Lead-free and RoHS-compliant construction | Meets global environmental compliance requirements without compromising solder joint integrity |
| Moisture Sensitivity Level 1 | Eliminates pre-bake requirement for standard SMT assembly processes |
Applications
| Automotive Body Control Module | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Providing stable 30V reference for microcontroller ADC input scaling in door module voltage monitoring. IC Role / Device Role / Timing Role: Shunt voltage reference maintaining accuracy despite battery voltage fluctuations (9–16V). Use Value: Enables ±1% measurement accuracy over -40°C to +125°C due to tight VZ tolerance and low TC. | Use Scenario: Biasing op-amp input stages in 4–20mA loop-powered pressure transmitters. IC Role / Device Role / Timing Role: Precision voltage clamp limiting common-mode input range to protect downstream amplifiers. Use Value: Prevents amplifier saturation during line surges while drawing only 0.1μA leakage at 23V. |
| Consumer Power Adapter Feedback | Medical Diagnostic Equipment Reference |
Use Scenario: Secondary-side voltage sensing in isolated flyback converters for USB-C PD adapters. IC Role / Device Role / Timing Role: Zener-based optocoupler feedback network setting output regulation point. Use Value: Delivers stable 30V reference with 49Ω impedance to minimize regulation error under load step changes. | Use Scenario: Setting threshold voltage in ECG front-end comparator circuits for heartbeat detection. IC Role / Device Role / Timing Role: Low-noise voltage reference defining analog signal decision boundary. Use Value: Ensures consistent trigger point across temperature due to predictable +0.07%/°C TC and <0.1μA leakage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C30LT1G | 30V, ±5%, 300mW, SOD-323 package, 70Ω Zz | Lower power rating and smaller footprint; less thermal mass | Select when board space is critical and power demand ≤200mW |
| MM3Z30VT1G | 30V, ±5%, 200mW, SOD-323, 80Ω Zz, 0.1μA IR | Reduced power capability and higher impedance limit regulation fidelity | Prefer for ultra-low-cost consumer designs where thermal margin is ample |
Compared with MMSZ5256B-7-F, BZX584C30LT1G offers smaller size but sacrifices 200mW power headroom and 21Ω lower impedance, while MM3Z30VT1G trades 170mW dissipation and higher Zz for cost-sensitive volume production - making the MMSZ5256B-7-F optimal for automotive and industrial applications needing robust thermal performance and low-impedance regulation.
Availability
MMSZ5256B-7-F is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor signal conditioning, and consumer power adapter feedback requiring stable component supply and AEC-Q101 reliability assurance.
Supply support for MMSZ5256B-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 manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
The MMSZ52xxB series belongs to Diodes' general-purpose Zener diode product line, engineered for cost-effective, high-yield voltage regulation in commercial and automotive applications where precision, reliability, and RoHS compliance are essential.
FAQ
What is the maximum steady-state power dissipation for MMSZ5256B-7-F at room temperature?
The maximum steady-state power dissipation is 370mW at TA = +25°C when mounted on an FR-4 PCB with a 1-inch copper pad layout. This value drops linearly per the derating curve in Figure 1, reaching 500mW only at lead temperature TL = +75°C - not ambient temperature.
Does MMSZ5256B-7-F have automotive qualification?
Yes, MMSZ5256B-7-F is qualified to AEC-Q101 standards for high-reliability automotive applications. The "Q" suffix denotes automotive grade, but this part number uses the commercial "-7-F" suffix; however, the underlying die and process are AEC-Q101 qualified per DS18010 Rev. 28, allowing use in automotive systems when sourced with appropriate traceability.
How is polarity identified on the SOD-123 package?
Polarity is indicated by a cathode band printed on the top surface near one end of the SOD-123 case. The banded end is the cathode; the opposite end is the anode. This marking aligns with JEDEC standard orientation and is visible under 10x magnification during visual inspection or AOI.
What is the typical temperature coefficient for this 30V Zener?
The typical temperature coefficient is +0.07%/°C, as shown in Figure 6 of DS18010 for MMSZ5256B (M1 code). This positive TC means output voltage increases slightly with rising junction temperature - a key factor when designing temperature-stable references across -40°C to +150°C operating range.
MMSZ5256B-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):
- 30 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 49 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 23 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
MMSZ5256B-7-F FAQ
1.How can I place an order for MMSZ5256B-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5256B-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 MMSZ5256B-7-F reliable?
The price and inventory of MMSZ5256B-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 MMSZ5256B-7-F is usually 5 days.
3.What payment methods are accepted for MMSZ5256B-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5256B-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5256B-7-F?
MMSZ5256B-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5256B-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 MMSZ5256B-7-F?
For technical support, including MMSZ5256B-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5256B-7-F requirements.
6.How does Aetrix verify that MMSZ5256B-7-F is sourced from the original manufacturer or authorized distributors?
All MMSZ5256B-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 MMSZ5256B-7-F meets industry standards.
7.What is the process for return or replacement of MMSZ5256B-7-F?
All MMSZ5256B-7-F units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5256B-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 MMSZ5256B-7-F part is unused and in its original packaging.
Return procedure for MMSZ5256B-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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