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onsemi MMSZ5256CT1G
- Part No.:
- MMSZ5256CT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5256CT1G.pdf
- Description:
- DIODE ZENER 30V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:7,188
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Product details
Overview
MMSZ5256CT1G from onsemi is a 30 V ±2% tolerance Zener diode in SOD−123 package, rated for 500 mW power dissipation at 75°C ambient, with 4.2 mA test current (IZT), 49 Ω dynamic impedance (ZZT), and 0.1 µA reverse leakage at 23 V (VR). It serves as a precision voltage reference or overvoltage clamp in low-power analog sensing and regulator feedback paths.
For engineers reviewing the MMSZ5256CT1G datasheet, pinout, applications, or equivalent options, key selection criteria include its tight 2% Zener voltage tolerance, low 49 Ω impedance at 4.2 mA, thermal equilibrium–specified VZ, ESD robustness (>16 kV HBM), and Pb-free SOD−123 surface-mount compatibility with automated assembly.
Technical Context
This device operates as a two-terminal voltage reference, maintaining stable reverse breakdown at nominal 30 V when biased above IZK (1 mA) and within its 500 mW thermal limit. Its Zener voltage is specified under thermal equilibrium conditions (TL = 30°C ±1°C), ensuring repeatability across production lots.
The SOD−123 package delivers 150°C/W junction-to-lead thermal resistance and supports 260°C soldering for 10 seconds. With 0.1 µA leakage at VR = 23 V and 2.5 V forward voltage max at 10 mA, it enables low-quiescent-current biasing and reliable clamping in mixed-signal circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 29.4 V to 30.6 V @ IZT = 4.2 mA - tight 2% tolerance enables accurate voltage setting without trimming. |
| Power Dissipation (PD) | 500 mW on FR-5 board @ TL = 75°C - defines maximum continuous power before thermal derating begins. |
| Zener Impedance (ZZT) | 49 Ω @ IZT = 4.2 mA - low dynamic impedance ensures minimal output voltage variation under load changes. |
| Reverse Leakage (IR) | 0.1 µA @ VR = 23 V - ultra-low leakage preserves accuracy in high-impedance reference nodes. |
| Thermal Resistance (RJL) | 150°C/W junction-to-lead - supports efficient heat transfer to PCB copper, critical for sustained operation. |
| ESD Rating | Class 3 (>16 kV HBM) - withstands handling and board-level ESD events without parameter shift or failure. |
| Junction Temp Range | −55°C to +150°C - qualified for automotive under-hood and industrial control environments. |
Pinout & Package
SOD−123 surface-mount plastic package (1.60 × 2.69 × 1.16 mm), void-free thermosetting case with corrosion-resistant, solderable finish; cathode indicated by polarity band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Zener breakdown terminal | Connected to regulated voltage node; reverse-biased during normal operation. |
| 2 (Anode) | Reference ground return | Tied to circuit common or feedback node; completes Zener conduction path. |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Reduces need for external trimming in precision reference designs; improves BOM consistency. |
| 500 mW power rating on FR-5 | Supports higher current regulation than standard 250 mW Zeners without thermal runaway risk. |
| Low 49 Ω dynamic impedance | Minimizes output voltage deviation under varying load currents in feedback loops. |
| ESD Class 3 (>16 kV HBM) | Eliminates need for additional ESD protection in cost-sensitive consumer and industrial PCBs. |
| Pb-free and RoHS-compliant | Meets global environmental compliance requirements without sacrificing electrical performance. |
Applications
| Industrial Sensor Signal Conditioning | Automotive Body Control Module Reference |
|---|---|
Use Scenario: Stabilizing excitation voltage for resistive temperature detectors (RTDs) in PLC analog input modules. IC Role / Device Role / Timing Role: Precision voltage reference providing 30 V bias to RTD bridge, enabling <0.1% full-scale measurement accuracy. Use Value: Tight 2% VZ tolerance and low ZZT ensure stable bridge voltage despite supply ripple and temperature drift. |
Use Scenario: Clamping microcontroller I/O pins against load-dump transients in 12 V vehicle subsystems. IC Role / Device Role / Timing Role: Overvoltage protection element shunting transient energy above 30 V to ground during battery disconnect events. Use Value: 0.1 µA leakage at 23 V prevents false triggering; 150°C/W RJL allows safe dissipation of short-duration surges. |
| Medical Portable Device Power Monitoring | Consumer IoT Battery Voltage Supervisor |
Use Scenario: Generating stable reference for ADC measurement of Li-ion cell voltage in handheld diagnostic tools. IC Role / Device Role / Timing Role: Low-drift voltage reference feeding comparator input to detect end-of-charge or over-discharge thresholds. Use Value: −55°C to +150°C operating range ensures reliability across clinical storage and field use conditions. |
Use Scenario: Monitoring coin-cell voltage in Bluetooth beacons to trigger low-battery alerts before cutoff. IC Role / Device Role / Timing Role: Low-leakage Zener establishing threshold for discrete transistor switch that disables non-critical peripherals. Use Value: 0.1 µA IR at 23 V extends battery life beyond 2 years in sleep-mode dominant applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C30LT1G | 30 V ±5% tolerance, 300 mW rating, SOT-23 package, 70 Ω ZZT @ 5 mA | Higher voltage tolerance and lower power rating reduce accuracy in precision references but suit general-purpose clamping. | Select when cost or SOT-23 footprint compatibility outweighs need for 2% tolerance and 500 mW headroom. |
| MMSZ5256BT1G | Same 30 V nominal, but ±5% tolerance (28.5–31.5 V), identical SOD−123 package and thermal specs | Looser tolerance increases calibration burden in metrology-grade circuits but acceptable for non-critical biasing. | Choose only if design tolerances allow ±5% VZ variation and no upgrade to tighter tolerance is planned. |
Compared with MMSZ5256CT1G, BZX84-C30LT1G offers smaller SOT-23 size but sacrifices 40% power margin and 2.3× higher impedance; MMSZ5256BT1G shares identical form factor and thermal behavior but lacks the 2% precision needed for closed-loop feedback stability.
Availability
MMSZ5256CT1G is available at Aetrix Electronics and suitable for industrial sensor conditioning, automotive body electronics, medical portable devices, and consumer IoT battery monitoring requiring stable component supply and long-term lifecycle support.
Supply support for MMSZ5256CT1G 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
onsemi (Semiconductor Components Industries, LLC) is a global supplier of energy-efficient semiconductor solutions, specializing in automotive, industrial, cloud, and IoT applications.
The MMSZ52xxxT1G series was designed for high-reliability, surface-mount voltage regulation in space-constrained systems-emphasizing thermal stability, ESD resilience, and tight parametric control across wide temperature ranges.
FAQ
What is the Zener voltage tolerance of MMSZ5256CT1G?
The MMSZ5256CT1G has a ±2% Zener voltage tolerance, meaning its reverse breakdown voltage is guaranteed between 29.4 V and 30.6 V when measured at IZT = 4.2 mA under thermal equilibrium conditions (TL = 30°C ±1°C). This tighter tolerance compared to the "B" suffix variants makes MMSZ5256CT1G suitable for applications demanding higher voltage accuracy without external calibration.
What is the maximum power dissipation for MMSZ5256CT1G on a standard PCB?
MMSZ5256CT1G is rated for 500 mW total power dissipation on an FR-5 board at a lead temperature (TL) of 75°C. Above 75°C, power must be linearly derated at 6.7 mW/°C. Its 150°C/W junction-to-lead thermal resistance enables effective heat transfer to PCB copper, supporting reliable operation in compact layouts where airflow is limited.
How does the dynamic impedance of MMSZ5256CT1G affect its performance in a voltage reference circuit?
The MMSZ5256CT1G exhibits a maximum dynamic impedance (ZZT) of 49 Ω at IZT = 4.2 mA. This low value means the output voltage varies less than 0.2 V for a 4 mA change in Zener current-critical for maintaining regulation accuracy in feedback networks of switching regulators or precision analog sensors where load current fluctuates.
Is MMSZ5256CT1G suitable for automotive applications?
Yes, MMSZ5256CT1G is AEC-Q101 qualified and PPAP capable when ordered with the SZ prefix (e.g., SZMMSZ5256CT1G). Even in standard MMSZ5256CT1G configuration, its −55°C to +150°C junction temperature range, >16 kV HBM ESD rating, and Pb-free construction meet core requirements for non-safety-critical automotive modules such as body control units and infotainment power supplies.
What is the reverse leakage current specification for MMSZ5256CT1G?
MMSZ5256CT1G specifies a maximum reverse leakage current (IR) of 0.1 µA at VR = 23 V and TA = 25°C. This ultra-low leakage ensures minimal error contribution in high-impedance reference nodes-such as those found in battery voltage supervisors or RTD excitation circuits-where even nanoampere-level currents can shift measurement baselines.
MMSZ5256CT1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- MMSZ52xxxT1G
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 30 V
- Tolerance:
- ±2%
- 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:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
MMSZ5256CT1G FAQ
1.How can I place an order for MMSZ5256CT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5256CT1G 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 MMSZ5256CT1G reliable?
The price and inventory of MMSZ5256CT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5256CT1G is usually 5 days.
3.What payment methods are accepted for MMSZ5256CT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5256CT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5256CT1G?
MMSZ5256CT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5256CT1G 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 MMSZ5256CT1G?
For technical support, including MMSZ5256CT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5256CT1G requirements.
6.How does Aetrix verify that MMSZ5256CT1G is sourced from the original manufacturer or authorized distributors?
All MMSZ5256CT1G 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 MMSZ5256CT1G meets industry standards.
7.What is the process for return or replacement of MMSZ5256CT1G?
All MMSZ5256CT1G units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5256CT1G, 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 MMSZ5256CT1G part is unused and in its original packaging.
Return procedure for MMSZ5256CT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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