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onsemi MMSZ5250BT1
- Part No.:
- MMSZ5250BT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5250BT1.pdf
- Description:
- DIODE ZENER 20V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:3,847
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Product details
Overview
MMSZ5250BT1 from ON Semiconductor is a 20 V ±5% Zener voltage regulator diode in SOD−123 package, rated for 500 mW power dissipation on FR−5 board at 75°C, with 6.2 mA test current (IZT), 25 Ω dynamic impedance (ZZT), and 0.1 µA reverse leakage at 15 V (VR). It serves as a precision voltage reference or overvoltage clamp in low-power analog sensing and power supply feedback circuits.
For engineers reviewing the MMSZ5250BT1 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal derating behavior, SOD−123 terminal mapping, and validated alternative parts for voltage reference design, ESD-protected biasing, and compact DC regulation where ±5% tolerance and 20 V nominal clamping are required.
Technical Context
The MMSZ5250BT1 operates as a silicon planar Zener diode with controlled avalanche breakdown at 20 V nominal, specified under thermal equilibrium conditions (TL = 30°C ±1°C). Its 25 Ω Zener impedance at 6.2 mA ensures stable regulation across load variations in low-current applications.
Thermal resistance is 340°C/W junction-to-ambient (RJA) and 150°C/W junction-to-lead (RJL), enabling predictable power derating above 75°C. The device exhibits a positive temperature coefficient typical of mid-voltage Zeners (~0.085 mV/°C per Figure 1), supporting stable operation from −55°C to +150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 19.0–21.0 V @ IZT = 6.2 mA - defines precise clamping threshold for 20 V nominal regulation |
| Power Dissipation (PD) | 500 mW @ TL = 75°C - maximum continuous power on standard FR−5 PCB before thermal derating applies |
| Zener Impedance (ZZT) | 25 Ω @ IZT = 6.2 mA - low dynamic resistance ensures minimal output voltage shift under current variation |
| Reverse Leakage (IR) | 0.1 µA @ VR = 15 V - ultra-low off-state current preserves battery life in always-on monitoring circuits |
| Thermal Resistance (RJA) | 340°C/W - quantifies junction temperature rise per watt dissipated in still air, critical for thermal margin analysis |
| ESD Rating | Class 3 (>16 kV HBM) - enables direct integration into unshielded front-end interfaces without external protection |
| Operating Temperature | −55°C to +150°C - supports automotive under-hood and industrial control environments |
Pinout & Package
SOD−123 surface-mount plastic package (Case 425, Style 1), void-free thermosetting epoxy, cathode indicated by polarity band. Dimensions: 1.40–1.80 mm width (D), 2.54–2.84 mm length (E), 0.94–1.35 mm height (A).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Zener anode connection point | Connected to regulated voltage node; reverse-biased during Zener operation |
| 2 (Anode) | Zener cathode connection point | Connected to circuit ground or lower-potential rail; completes bias path for breakdown conduction |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW Power Rating | Enables use in higher-current reference paths than standard 250 mW Zeners without heatsinking |
| ±5% Zener Tolerance | Guarantees voltage accuracy within 1.0 V of 20 V nominal, suitable for non-critical regulation and threshold detection |
| Class 3 ESD Robustness | Eliminates need for discrete ESD protection in sensor interface and I/O line conditioning designs |
| Pb-Free Construction | Complies with RoHS Directive 2011/65/EU and JEDEC J-STD-020 reflow profiles up to 260°C |
| Thermal Equilibrium Spec | Ensures published VZ and ZZT values reflect steady-state operating conditions, not transient measurements |
Applications
| Industrial Sensor Signal Conditioning | Automotive Body Control Module (BCM) Biasing |
|---|---|
Use Scenario: Stabilizing excitation voltage for resistive temperature detectors (RTDs) in factory automation PLC modules. IC Role / Device Role / Timing Role: Zener voltage reference providing fixed 20 V bias to RTD bridge, compensating for supply ripple. Use Value: 25 Ω ZZT minimizes output error from bridge current fluctuations, maintaining <0.1% measurement linearity. | Use Scenario: Clamping microcontroller I/O pins against load-dump transients in 12 V vehicle subsystems. IC Role / Device Role / Timing Role: Overvoltage protector shunting surge energy to ground when input exceeds 21 V. Use Value: 0.1 µA IR at 15 V prevents false triggering during normal operation while enabling fast response to >20 V spikes. |
| Low-Power IoT Node Voltage Reference | Medical Portable Device Power Supervision |
Use Scenario: Generating stable reference for ADC in battery-powered environmental monitors. IC Role / Device Role / Timing Role: Precision voltage source feeding ADC reference input in sub-100 µA sleep-mode systems. Use Value: −55°C to +150°C operating range ensures calibration stability across outdoor deployment temperatures. | Use Scenario: Monitoring main supply rail integrity in handheld diagnostic tools with dual-battery backup. IC Role / Device Role / Timing Role: Undervoltage detector using Zener breakdown to trigger reset logic when VCC drops below 19 V. Use Value: 19.0 V minimum VZ guarantees reliable reset assertion before brownout affects analog front-end performance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C20 | Same 20 V ±5% rating but SOT-23 package; 350 mW PD; 30 Ω ZZT @ 5 mA | Higher thermal resistance (450°C/W) limits power handling on dense PCBs | Select when footprint compatibility with existing SOT-23 layouts is mandatory |
| MMSZ5250ET1G | Identical electrical specs and SOD−123 package; Pb-free variant with "G" suffix | No functional difference; fully interchangeable in new designs requiring RoHS compliance | Select for new production requiring documented Pb-free status and AEC-Q101 qualification |
Compared with MMSZ5250BT1, BZX84-C20 offers smaller footprint but reduced power margin and higher impedance, while MMSZ5250ET1G provides identical performance with certified Pb-free construction-making it the preferred drop-in replacement for compliant manufacturing.
Availability
MMSZ5250BT1 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, automotive body control module biasing, and low-power IoT node voltage reference applications requiring stable component supply, consistent parametric performance, and long-term sourcing continuity.
Supply support for MMSZ5250BT1 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 medical markets.
The MMSZ52xxxT1G series targets cost-sensitive, high-volume applications requiring compact, reliable voltage regulation-designed specifically for surface-mount assembly in space-constrained consumer, industrial, and automotive electronics.
FAQ
What is the exact Zener voltage tolerance for MMSZ5250BT1?
The MMSZ5250BT1 has a ±5% Zener voltage tolerance, meaning its reverse breakdown voltage is guaranteed between 19.0 V and 21.0 V when measured at IZT = 6.2 mA under thermal equilibrium conditions (TL = 30°C ±1°C). This tolerance is confirmed in the "5% TOLERANCE FG ELECTRICAL CHARACTERISTICS" table on page 3 of the official ON Semiconductor datasheet for MMSZ5250BT1.
Does MMSZ5250BT1 meet automotive qualification standards?
Yes, the MMSZ5250BT1 is AEC−Q101 qualified and PPAP capable, as explicitly stated in the "Features" section of the datasheet. It also carries the "SZ" prefix option (e.g., SZMMSZ5250BT1G) for applications requiring unique site and control change requirements-confirming its suitability for automotive body electronics and infotainment systems.
What is the maximum reverse leakage current for MMSZ5250BT1 at 15 V?
The maximum reverse leakage current (IR) for MMSZ5250BT1 is 0.1 µA at VR = 15 V, as specified in the "5% TOLERANCE FG ELECTRICAL CHARACTERISTICS" table. This value is measured at TA = 25°C and reflects the device's ability to maintain high impedance in the off-state, critical for low-power standby operation.
Can MMSZ5250BT1 be used in high-density PCB layouts?
Yes, the MMSZ5250BT1 uses the SOD−123 package (Case 425), which measures only 1.40–1.80 mm in width and 2.54–2.84 mm in length-enabling placement in high-density layouts. Its small footprint and optimized solder pad geometry (per the "SOLDERING FOOTPRINT" diagram on page 7) support automated assembly without sacrificing thermal performance.
How does thermal derating affect MMSZ5250BT1 power handling above 75°C?
Above 75°C lead temperature (TL), the MMSZ5250BT1 power dissipation must be linearly derated at 6.7 mW/°C, as defined in the "MAXIMUM RATINGS" table. At TL = 100°C, its usable power drops to 332.5 mW (500 mW − [25°C × 6.7 mW/°C]), ensuring safe junction temperature operation within the −55°C to +150°C range.
MMSZ5250BT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 20 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 25 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 15 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
MMSZ5250BT1 FAQ
1.How can I place an order for MMSZ5250BT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5250BT1 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 MMSZ5250BT1 reliable?
The price and inventory of MMSZ5250BT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5250BT1 is usually 5 days.
3.What payment methods are accepted for MMSZ5250BT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5250BT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5250BT1?
MMSZ5250BT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5250BT1 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 MMSZ5250BT1?
For technical support, including MMSZ5250BT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5250BT1 requirements.
6.How does Aetrix verify that MMSZ5250BT1 is sourced from the original manufacturer or authorized distributors?
All MMSZ5250BT1 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 MMSZ5250BT1 meets industry standards.
7.What is the process for return or replacement of MMSZ5250BT1?
All MMSZ5250BT1 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5250BT1, 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 MMSZ5250BT1 part is unused and in its original packaging.
Return procedure for MMSZ5250BT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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