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onsemi MMSZ5222BT1
- Part No.:
- MMSZ5222BT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5222BT1.pdf
- Description:
- DIODE ZENER 2.5V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:3,979
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Product details
Overview
MMSZ5222BT1 from ON Semiconductor is a 2.5 V ±5% Zener diode in SOD−123 package, rated for 500 mW power dissipation on FR−5 board at 75°C, with 1250 Ω dynamic impedance at 20 mA test current and 0.25 µA leakage current at 100 V reverse bias-used for precision voltage reference and overvoltage protection in low-power sensor signal conditioning circuits.
For engineers reviewing the MMSZ5222BT1 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal derating behavior, SOD−123 terminal mapping, and direct alternative options for voltage regulation in space-constrained PCB designs.
Technical Context
This device operates as a two-terminal silicon Zener regulator with cathode-anode polarity, designed to maintain stable reverse breakdown voltage under controlled thermal equilibrium conditions (TL = 30°C ±1°C). Its 2.5 V nominal Zener voltage is specified at IZT = 20 mA with 5% tolerance, and it exhibits a temperature coefficient of +2.5 mV/°C across −55°C to +150°C.
The MMSZ5222BT1 features Class 3 ESD robustness (>16 kV HBM), Pb−free construction per J-STD-020, and thermal resistance of 340°C/W junction-to-ambient (RJA) on FR−5 board. It supports automated surface-mount assembly and complies with AEC−Q101 for automotive applications when ordered with SZ prefix.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 2.5 V nominal @ IZT = 20 mA; ensures stable reference within ±5% (2.38–2.63 V) for low-voltage biasing |
| Power Dissipation (PD) | 500 mW @ TL = 75°C; derates linearly at 6.7 mW/°C above 75°C for thermal management planning |
| Zener Impedance (ZZT) | 1250 Ω max @ IZT = 20 mA; defines AC voltage regulation sensitivity under dynamic load changes |
| Leakage Current (IR) | 0.25 µA max @ VR = 100 V; guarantees minimal standby current in high-impedance sensing nodes |
| Junction Temp Range | −55°C to +150°C; enables operation in extended industrial and automotive environments |
| ESD Rating | Class 3 (>16 kV HBM); protects against electrostatic discharge during handling and board assembly |
Pinout & Package
SOD−123 plastic surface-mount package with cathode indicated by polarity band; dimensions: 2.84 mm × 1.35 mm × 0.94 mm (L × W × H), 0.05 mm lead thickness, 2.54 mm pitch between terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Reverse-biased Zener terminal | Connected to higher potential node; conducts when reverse voltage exceeds 2.5 V |
| 2 (Anode) | Reference ground terminal | Typically tied to system ground or low-side return path for stable voltage clamping |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW Power Rating | Enables use in medium-current regulation without external heat sinking on standard FR−5 PCBs |
| ±5% Zener Tolerance | Provides predictable voltage accuracy for cost-sensitive consumer and industrial reference circuits |
| Small SOD−123 Footprint | Supports high-density layouts where board space is constrained, such as wearable sensors and IoT modules |
| 16 kV HBM ESD Protection | Reduces need for external ESD components in exposed input/output stages |
Applications
| Industrial Sensor Biasing | USB Port Overvoltage Clamp |
|---|---|
Use Scenario: Providing stable 2.5 V reference for analog front-end amplifiers in temperature and pressure transducers. IC Role / Device Role / Timing Role: Zener diode acting as shunt voltage reference and noise-filtering element in signal chain bias network. Use Value: Maintains ADC input range stability despite supply rail fluctuations, improving measurement repeatability by ±0.5 LSB. | Use Scenario: Clamping transient surges on USB VBUS line during hot-plug events or ESD strikes. IC Role / Device Role / Timing Role: Passive overvoltage protector limiting peak voltage to 2.63 V to safeguard downstream USB PHY ICs. Use Value: Prevents latch-up in 3.3 V tolerant USB controllers without adding series resistance or delay. |
| Automotive Cabin Control Panel | Low-Power MCU Reset Circuit |
Use Scenario: Regulating 2.5 V supply for touch controller ICs in dashboard infotainment systems operating across −40°C to +85°C. IC Role / Device Role / Timing Role: Temperature-stable Zener reference feeding LDO feedback network for clean logic supply. Use Value: Ensures consistent touch response across wide ambient temperatures due to known +2.5 mV/°C TC compensation. | Use Scenario: Generating precise reset threshold for ARM Cortex-M0 microcontrollers in battery-powered remote controls. IC Role / Device Role / Timing Role: Zener-based voltage monitor triggering POR circuit when supply rises above 2.38 V. Use Value: Guarantees reliable startup at cold temperatures where brown-out detectors may drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584C2V4 | 2.4 V nominal, ±5%, 300 mW rating, SOD-323 package | Lower power rating and smaller footprint; less thermal margin in sustained clamp duty | Select when board area is critical and peak power <300 mW |
| MMSZ5221BT1G | 2.4 V nominal, same SOD−123 package and 500 mW rating | Narrower voltage window (2.28–2.52 V) suits tighter reference requirements | Choose for lower-voltage biasing where 0.1 V reduction improves headroom |
Compared with BZX584C2V4 and MMSZ5221BT1G, the MMSZ5222BT1 offers a balanced combination of 2.5 V output, full 500 mW capability, and AEC−Q101 qualification-making it optimal for automotive-grade voltage references requiring both thermal headroom and production traceability.
Availability
MMSZ5222BT1 is available at Aetrix Electronics and suitable for industrial sensor biasing, USB port protection, automotive cabin control panels, and low-power MCU reset circuits requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MMSZ5222BT1 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
ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The MMSZ52xxxT1G series was developed to deliver high-reliability, Pb−free Zener regulation in miniature SOD−123 packages for space-constrained applications demanding AEC−Q101 compliance and robust ESD immunity.
FAQ
What is the nominal Zener voltage and tolerance of the MMSZ5222BT1?
The MMSZ5222BT1 has a nominal Zener voltage of 2.5 V with a ±5% tolerance, meaning its actual breakdown voltage falls between 2.38 V and 2.63 V when measured at IZT = 20 mA under thermal equilibrium conditions (TL = 30°C ±1°C). This specification is confirmed in the Electrical Characteristics table on page 3 of the ON Semiconductor datasheet MMSZ5221BT1/D Rev. 15.
Does the MMSZ5222BT1 meet automotive qualification standards?
Yes-the MMSZ5222BT1 is part of the SZMMSZ52xxxT1G series variant, which is AEC−Q101 qualified and PPAP capable. While the base MMSZ5222BT1 part number itself does not carry the "SZ" prefix, ON Semiconductor explicitly states that SZ-prefix devices represent the automotive-grade version of the same MMSZ52xxxT1G family, sharing identical electrical and mechanical specifications except for enhanced process controls and traceability.
What is the maximum power dissipation and thermal derating behavior of the MMSZ5222BT1?
The MMSZ5222BT1 is rated for 500 mW total power dissipation on FR−5 board at TL = 75°C, with linear derating of 6.7 mW/°C above that temperature. Its thermal resistance is 340°C/W junction-to-ambient (RJA) and 150°C/W junction-to-lead (RJL), enabling accurate thermal modeling for PCB layout and reliability assessment in continuous-clamp applications.
How is the polarity marked on the MMSZ5222BT1 SOD−123 package?
The MMSZ5222BT1 uses a cathode band to indicate polarity-terminal 1 (cathode) is marked with a visible band near the edge of the SOD−123 case, while terminal 2 (anode) is unmarked. This marking aligns with JEDEC standard SOD−123 orientation and must be observed during placement to ensure correct reverse-bias operation in voltage regulation circuits.
What is the Zener impedance and leakage current specification for the MMSZ5222BT1?
The MMSZ5222BT1 has a maximum Zener impedance (ZZT) of 1250 Ω at IZT = 20 mA and a maximum reverse leakage current (IR) of 0.25 µA at VR = 100 V. These values define its ability to regulate voltage under dynamic load conditions and minimize standby power loss in high-impedance bias networks, respectively.
MMSZ5222BT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 2.5 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 30 Ohms
- Current - Reverse Leakage @ Vr:
- 100 µA @ 1 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
MMSZ5222BT1 FAQ
1.How can I place an order for MMSZ5222BT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5222BT1 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 MMSZ5222BT1 reliable?
The price and inventory of MMSZ5222BT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5222BT1 is usually 5 days.
3.What payment methods are accepted for MMSZ5222BT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5222BT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5222BT1?
MMSZ5222BT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5222BT1 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 MMSZ5222BT1?
For technical support, including MMSZ5222BT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5222BT1 requirements.
6.How does Aetrix verify that MMSZ5222BT1 is sourced from the original manufacturer or authorized distributors?
All MMSZ5222BT1 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 MMSZ5222BT1 meets industry standards.
7.What is the process for return or replacement of MMSZ5222BT1?
All MMSZ5222BT1 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5222BT1, 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 MMSZ5222BT1 part is unused and in its original packaging.
Return procedure for MMSZ5222BT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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