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HomeProductsDiscrete Semiconductor ProductsDiodes - Rectifiers - SingleMMSZ5256BS
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MMSZ5256BS - Yangjie Technology

Manufacturer Part Number
MMSZ5256BS
Manufacturer
Yangjie Technology
Allelco Part Number
32D-MMSZ5256BS
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
2,706,850 pcs available, New & Original
Parts Description
Diodes - Rectifiers - Single SOD
Package
Tape & Reel (TR)
Data sheet
-
RoHs Status
RoHS Compliant
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Our certification
In stock: 2706850
  • Unit Price: $0.016
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
20+ $0.016 $0.32
200+ $0.013 $2.60
600+ $0.011 $6.60
3000+ $0.01 $30.00
9000+ $0.009 $81.00
21000+ $0.009 $189.00
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

MMSZ5256BS Tech Specifications
Yangjie Technology - MMSZ5256BS technical specifications, attributes, parameters and parts with similar specifications to Yangjie Technology - MMSZ5256BS

Product Attribute Attribute Value
Manufacturer Yangjie Technology
Series -
Product Attribute Attribute Value
Package Tape & Reel (TR)

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status RoHS Compliant
REACH Status REACH Unaffected
ECCN EAR99

Frequently Asked Questions(FAQ)

What are the key electrical characteristics of the MMSZ5256BS Zener diode that influence its suitability for voltage regulation in low-power analog circuits?
The MMSZ5256BS operates with a nominal Zener voltage of 30V, within a specified range of 28.5V to 31.5V, making it suitable for precise reference applications. Its maximum power dissipation is rated at 200mW, which constrains continuous operation to low-current conditions—typically under 7mA at full voltage. The dynamic impedance measures 49Ω during regulation (Zzt), indicating relatively stable voltage behavior under varying load currents. However, at lower operating points near the knee, the impedance rises significantly to 600Ω (Zzk), which can lead to increased output ripple in lightly loaded or high-impedance circuits. These characteristics suggest the device is best suited for applications where input voltage stability and moderate load current allow consistent performance.
How does the reverse leakage current of the MMSZ5256BS compare to other Zener diodes in the SOD-323 package, and what implications does this have for precision reference designs?
With a reverse leakage current of 100nA at 23V, the MMSZ5256BS exhibits typical off-state behavior for a standard silicon Zener in this voltage range. While not exceptionally low compared to modern ultra-low-leakage devices, it remains acceptable for most analog signal conditioning and bias applications. In high-impedance or battery-powered systems, however, even 100nA can introduce offset errors when used as a reference across large source impedances. When selecting between similar Zeners like the MMSZ5229B or BZT52C30, engineers must consider whether the slight increase in leakage from lower-voltage counterparts could degrade measurement accuracy in instrumentation-grade designs.
Can the MMSZ5256BS be used effectively in series voltage regulation configurations, and what thermal considerations should be addressed given its 200mW rating?
Yes, the MMSZ5256BS can function in basic series regulator topologies where it conducts excess voltage as heat. However, due to its 200mW power dissipation limit, it must operate well below maximum junction temperature even in small packages. For example, if regulating a 36V input down to 30V with a 10mA load current, the Zener will dissipate 60mW—within safe limits. But in environments with elevated ambient temperatures or poor PCB thermal coupling, derating becomes necessary. Engineers should ensure adequate copper area or airflow to maintain junction temperature below 125°C under worst-case conditions, especially when combined with other components drawing shared current.
How does the MMSZ5256BS perform in terms of transient response and surge handling compared to higher-power Zener alternatives?
The MMSZ5256BS is not designed for high-energy transients; its 200mW rating implies limited surge capability, typically in the hundreds of millijoules for short durations but undefined beyond datasheet limits. In contrast, larger TO-220 packaged Zeners like the 1N4756A (1W) handle significantly greater energy absorption. Therefore, while the MMSZ5256BS may suppress brief voltage spikes in sensitive circuits, it cannot replace dedicated transient voltage suppressor (TVS) diodes or robust clamping networks in automotive or industrial settings exposed to surges. Designers should pair it with input filtering or overvoltage protection circuits when used in harsh environments.
Is the MMSZ5256BS suitable for use in battery-backed RTC circuits requiring stable 30V references, and how does aging affect its long-term reliability?
The MMSZ5256BS is unlikely to be directly used as a 30V reference in battery-powered RTC modules, since such circuits typically operate at 3V or 5V logic levels. Instead, it would require additional step-down circuitry, introducing complexity and inefficiency. More importantly, Zener diodes like the MMSZ5256BS exhibit gradual voltage shift over time due to oxide layer changes, often increasing by several hundred millivolts after 1,000 hours of operation. This aging effect means initial calibration may drift out of tolerance in precision timing applications. Thus, for critical timing references, bandgap-based IC regulators are generally preferred over discrete Zeners despite higher component count.
How does the impedance variation between Zzt and Zzk affect circuit design when using the MMSZ5256BS as a load regulator?
The MMSZ5256BS has a dynamic impedance of 49Ω at nominal current and jumps to 600Ω near threshold conduction. This wide variation impacts load regulation: under light loads, the higher Zzk value causes significant output droop for small current changes, degrading regulation accuracy. In feedback-controlled systems, this nonlinearity complicates compensation network design. To mitigate this, engineers often add a small bypass capacitor or use a buffer amplifier after the Zener. Alternatively, choosing a Zener with lower Zzt (e.g., <10Ω) improves line regulation but increases cost and size—a trade-off inherent in discrete component selection.
What packaging advantages does the SOD-323 offer for automated assembly of the MMSZ5256BS, and how might layout density impact performance?
The SOD-323 package enables high-density PCB mounting ideal for space-constrained consumer electronics, supporting automated pick-and-place processes with standard tape-and-reel (TR) feeders. Its small footprint allows up to 2,500 units per reel, reducing handling costs. However, minimal lead length increases susceptibility to parasitic inductance during fast transients, potentially causing ringing in switching supplies. Additionally, without direct thermal connection to ground planes, self-heating under sustained load reduces effective Pd. Placement near signal paths also risks noise coupling via substrate effects. Thus, while beneficial for manufacturing, careful layout is required to preserve electrical performance.
How does the MMSZ5256BS compare thermally to surface-mount Zeners like the BZX84 series when used in compact power management circuits?
The MMSZ5256BS shares similar thermal characteristics with other SOD-323 Zeners due to identical construction. Compared to the BZX84 variants, which offer multiple voltage options including 30V models, the MMSZ5256BS has comparable Pd (200mW) but lacks integrated resistors or dual-diode configurations. Thermally, both rely on board conduction rather than metal-can interfaces, so heat transfer depends primarily on pad design and copper pour area. In practice, neither achieves the thermal conductivity of larger SOT-23 packages like the MMBZ5241BL. For sustained regulation above 50mW, both require explicit thermal relief planning, whereas pulsed applications benefit from their shared low profile.
Are there any recommended decoupling strategies when integrating the MMSZ5256BS into a mixed-signal circuit to minimize supply noise?
While the MMSZ5256BS itself does not require local decoupling due to its passive nature, nearby sensitive analog stages benefit from a 0.1µF ceramic capacitor placed as close as possible to the load. This mitigates high-frequency noise that could modulate the Zener’s effective impedance through parasitic capacitance. However, adding capacitors directly across the MMSZ5256BS is generally unnecessary unless used in a feedback path, as it may destabilize regulation. Instead, focus on clean return paths and minimize loop area between the Zener and its load to reduce EMI pickup and improve transient response.
What environmental and regulatory factors should be considered when sourcing the MMSZ5256BS for commercial product certification?
The MMSZ5256BS complies with RoHS standards, eliminating lead and restricting hazardous substances, which aligns with global compliance requirements for electronic products. MSKSEMI’s manufacturing facilities typically follow ISO 9001 quality protocols, though individual lot traceability should be verified for safety-critical applications. Operating temperature range (-65°C to +150°C) supports industrial and automotive edge cases, but long-term exposure above 125°C accelerates degradation. For consumer goods, derating to ≤70°C ambient ensures reliable operation without accelerated life testing. Always confirm REACH and conflict mineral reporting from the distributor, as these affect supply chain transparency in regulated markets.
How does the Zener breakdown mechanism in the MMSZ5256BS behave under reverse bias, and what happens if forward-biased accidentally?
Under reverse bias exceeding 28.5V, the MMSZ5256BS enters avalanche breakdown, conducting heavily to clamp voltage. This is the intended mode of operation. If reverse voltage falls below the knee (~20V), it blocks current until the threshold is reached. Accidental forward biasing turns it into a standard diode with ~0.7V drop, allowing uncontrolled current flow limited only by series resistance. Given its small package resistance, even brief forward pulses can exceed 200mA, risking thermal damage. Designers should include current-limiting resistors or orientation checks to prevent misapplication in non-isolated circuits.
Can the MMSZ5256BS be paralleled with another Zener to increase current handling, and what are the practical limitations?
Paralleling two MMSZ5256BS devices theoretically doubles current capacity, but real-world matching is difficult due to manufacturing tolerances in Zener voltage (±2.5% typical). One unit may conduct more current than the other, leading to uneven power sharing and potential overload on one die. Without precise binning or active balancing, this approach introduces unreliability. Instead, designers should select a single higher-power Zener or use a linear regulator IC for increased load drive. Paralleling is rarely justified for low-Pd devices like the MMSZ5256BS unless redundancy or extreme miniaturization outweighs risk.
What role does the SOD-323 package play in ESD robustness for the MMSZ5256BS, and how does it compare to larger packages?
The SOD-323’s small size inherently limits ESD energy handling due to reduced junction area and shorter leads, resulting in lower HBM (Human Body Model) ratings—typically around 2kV versus 4kV+ in SOT-23 packages. While the MMSZ5256BS includes internal ESD protection structures, they are optimized for functional testing, not field robustness. In handheld devices or exposed connectors, external TVS diodes are strongly advised. Larger packages like the DO-214AA offer better survivability but compromise board space. The choice involves balancing cost, size, and application environment.
How does the temperature coefficient of the MMSZ5256BS affect voltage stability across its operating range, and what compensation techniques exist?
The MMSZ5256BS has a positive temperature coefficient near its 30V rating, meaning voltage increases slightly with rising temperature—approximately +2.5mV/°C near nominal conditions. Over a 100°C span, this results in a ~250mV shift, which can violate tight tolerance requirements in precision references. Compensation techniques include using a negative-COZener in series or parallel, though availability is limited. Alternatively, temperature-stabilized ceramic references or IC-based regulators provide superior stability. For less critical applications, averaging multiple Zeners or using feedback control can partially offset drift.
What are the implications of using the MMSZ5256BS in a switching converter feedback network, and how does impedance interact with control loop dynamics?
In switching regulator feedback dividers, the MMSZ5256BS can serve as a stable reference for error amplifiers, provided its dynamic impedance remains low enough to avoid amplifying switching ripple. At 49Ω, it presents a moderate load to the divider, requiring careful resistor selection to balance power loss and noise immunity. However, the high Zzk near turn-on can cause transient instability if the error amplifier interprets impedance changes as load variation. Adding a small capacitor (e.g., 1nF) across the Zener stabilizes the node but may slow response. Careful loop compensation is essential to prevent oscillation around the Zener knee.
How does the MMSZ5256BS compare to the Nexperia PMEG3025BEPS when used in high-reliability automotive voltage monitoring circuits?
The MMSZ5256BS and PMEG3025BEPS both offer 30V Zener functionality in similar SOD-323 packages, but differ in key parameters. The MMSZ5256BS specifies 200mW Pd and 100nA Ir, while the PMEG3025BEPS emphasizes ultra-low Ir (<10nA) and AEC-Q101 qualification. For automotive use, the latter’s tighter leakage control and proven reliability make it preferable despite slightly higher cost. The MMSZ5256BS may suffice in non-safety-critical infotainment systems, but functional safety domains demand stricter validation. Always verify AEC-Q101 status and IEC 61000-4-2 ESD levels before final selection.
What precautions should be taken during PCB soldering when mounting the MMSZ5256BS to avoid parametric degradation?
The MMSZ5256BS is sensitive to thermal stress during reflow. Standard lead-free profiles with peak temperatures >260°C for extended periods can cause delamination or bond wire lift-off, increasing leakage and shifting Vz. Use a controlled ramp rate (<4°C/sec) and limit dwell above 240°C to <60 seconds. Hand soldering should avoid prolonged contact (>3 seconds) at iron tip temperatures >350°C. Post-reflow inspection via electrical probing can detect early failures caused by microcracks. Properly designed solder paste stencils and alignment aids further reduce mechanical strain during assembly.

Parts with Similar Specifications

The three parts on the right have similar specifications to Yangjie Technology MMSZ5256BS

Product Attribute MMSZ5256BS MMSZ5256BQ MMSZ5256BT1G MMSZ5256B-HE3-08
Part Number MMSZ5256BS MMSZ5256BQ MMSZ5256BT1G MMSZ5256B-HE3-08
Manufacturer Yangjie Technology Yangjie Technology onsemi Vishay General Semiconductor - Diodes Division
Package Tape & Reel (TR) Tape & Reel (TR) Tape & Reel (TR) Tape & Reel (TR)
Series - - MMSZ52xxxT1G Automotive, AEC-Q101

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Customer Reviews

Evaluation: 10 Articles

  • Nath***rooks
    Jun 11, 2026

    Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

  • Stev***aker
    May 20, 2026

    Solid diode for power rectification. Works well in switching circuits.

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

  • Oliv***arris
    May 7, 2026

    Reliable I/O expander. Works well in embedded control applications.

  • Jess***Jones
    Apr 17, 2026

    It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.

  • Mich***Smith
    Apr 17, 2026

    Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.

  • Aman***arris
    Apr 3, 2026

    It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.

  • Mike***nch
    Apr 3, 2026

    Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

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MMSZ5256BS Image

MMSZ5256BS

Yangjie Technology
32D-MMSZ5256BS

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