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onsemi MMSZ5253BT1
- Part No.:
- MMSZ5253BT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5253BT1.pdf
- Description:
- DIODE ZENER 25V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:5,560
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Product details
Overview
MMSZ5253BT1 from ON Semiconductor is a 25 V ±5% Zener voltage regulator diode in SOD−123 surface-mount package, rated for 500 mW power dissipation on FR−5 board at 75°C, with 35 Ω dynamic impedance at 5.0 mA test current and 0.1 µA reverse leakage at 19 V, used for precision voltage reference and overvoltage protection in low-power analog circuits.
For engineers reviewing the MMSZ5253BT1 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal derating behavior, cathode/anode terminal mapping, and direct alternatives for voltage regulation design-in.
Technical Context
This device operates as a two-terminal shunt regulator, maintaining stable output voltage across its cathode–anode terminals when reverse-biased above its nominal Zener voltage of 25 V. It exhibits a temperature coefficient of +14.5 mV/°C (typical) and supports steady-state operation from −55°C to +150°C junction temperature.
Thermal resistance is specified at 340°C/W (junction-to-ambient) and 150°C/W (junction-to-lead), enabling accurate power derating calculations. Its ESD rating exceeds 16 kV per Human Body Model, confirming robustness in automated assembly and end-use environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 23.75 V min / 25 V nom / 26.25 V max @ IZT = 5.0 mA - defines regulated voltage window under standard test conditions |
| Power Dissipation (PD) | 500 mW @ TL = 75°C - maximum continuous power on FR−5 board before thermal derating applies |
| Zener Impedance (ZZT) | 600 Ω max @ IZT = 5.0 mA - indicates voltage regulation stability under small-signal AC perturbation |
| Reverse Leakage (IR) | 0.1 µA max @ VR = 19 V - ensures minimal standby current in undervoltage clamp configurations |
| Forward Voltage (VF) | 0.95 V max @ IF = 10 mA - confirms low-loss conduction in forward-biased protection paths |
| Junction Temp Range | −55°C to +150°C - enables deployment in automotive under-hood, industrial control, and outdoor electronics |
| ESD Rating | Class 3 (>16 kV HBM) - guarantees survivability during PCB handling and reflow without external protection |
Pinout & Package
SOD−123 plastic surface-mount package (Case 425, Style 1), 1.40–1.80 mm width, 2.54–2.84 mm length, 0.94–1.35 mm height, cathode indicated by polarity band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Regulated Output Reference Node | Connected to system ground or reference rail; voltage develops relative to anode when reverse-biased |
| 2 (Anode) | Input/Supply Terminal | Connected to unregulated input; current flows from anode to cathode during Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW Power Rating | Enables use in medium-current bias networks and feedback references without heatsinking on standard PCBs |
| ±5% Zener Tolerance | Supports cost-sensitive applications where tight voltage accuracy is not required, e.g., non-critical supply clamping |
| Pb-Free SOD−123 Package | Complies with RoHS and JEDEC J-STD-020 reflow profiles up to 260°C for 10 seconds |
| Class 3 ESD Robustness | Eliminates need for external ESD protection in board-level designs handling human interaction or cable interfaces |
| Thermal Equilibrium Spec | Zener voltage measured at TL = 30°C ±1°C, ensuring repeatability in production test and calibration workflows |
Applications
| Industrial Sensor Signal Conditioning | Automotive Body Control Module (BCM) Voltage Clamp |
|---|---|
Use Scenario: Stabilizing reference voltage for 12-bit ADC front-end in temperature sensor interface circuitry. IC Role / Device Role / Timing Role: Shunt voltage reference providing fixed 25 V bias to op-amp gain stage. Use Value: Maintains <±1% reference drift over −40°C to +85°C ambient due to known +14.5 mV/°C TC and low ZZT. |
Use Scenario: Clamping transient spikes on 12 V battery rail during load-dump events in door module MCU power domain. IC Role / Device Role / Timing Role: Overvoltage protector diverting surge current away from LDO input. Use Value: Absorbs 100 ms surges up to 30 V with <0.1 µA leakage at 19 V, preserving sleep-mode current budget. |
| Consumer IoT Power Management | Medical Diagnostic Equipment Bias Supply |
Use Scenario: Generating stable 25 V bias for photodiode transimpedance amplifier in portable pulse oximeter. IC Role / Device Role / Timing Role: Precision DC reference source for analog signal chain calibration. Use Value: Delivers 25 V ±5% with 600 Ω ZZT, minimizing gain error in high-impedance current-to-voltage conversion. |
Use Scenario: Providing isolated 25 V reference for DAC output buffer in ultrasound beamformer ASIC power sequencing. IC Role / Device Role / Timing Role: Low-noise voltage clamp ensuring clean analog supply rail integrity. Use Value: Achieves <1 µV RMS noise contribution and 0.1 µA leakage, meeting IEC 60601-1 leakage current limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX584-C24 | 24 V ±5%, 300 mW, SOD-323 package, 100 Ω ZZT @ 5 mA | Lower power rating and smaller footprint; higher ZZT limits regulation precision | Select when board space is constrained and 24 V regulation suffices with tighter ZZT tolerance |
| MMBZ5253BS | 25 V ±5%, 300 mW, SOT-23 package, 600 Ω ZZT @ 5 mA, same marking K3 | Same Zener spec but lower power rating and different thermal resistance (RJA = 400°C/W) | Choose only if existing SOT-23 layout exists and peak power remains below 300 mW |
Compared with MMSZ5253BT1, BZX584-C24 offers smaller size but reduced power handling and looser regulation; MMBZ5253BS matches voltage and impedance but sacrifices 40% power capability and thermal performance-both require validation of thermal margin and layout compatibility.
Availability
MMSZ5253BT1 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body electronics, and medical diagnostic equipment requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for MMSZ5253BT1 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 supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MMSZ52xxxT1G series was designed for general-purpose, medium-current voltage regulation in space-constrained surface-mount applications, emphasizing manufacturability, thermal reliability, and AEC−Q101 compliance for automotive use.
FAQ
What is the nominal Zener voltage and tolerance of MMSZ5253BT1?
The MMSZ5253BT1 has a nominal Zener voltage of 25 V with a ±5% tolerance, meaning its actual reverse breakdown voltage falls between 23.75 V and 26.25 V when tested at IZT = 5.0 mA and thermal equilibrium (TL = 30°C ±1°C). This tolerance is confirmed in the "5% TOLERANCE FG ELECTRICAL CHARACTERISTICS" table on page 3 of the ON Semiconductor datasheet.
Does MMSZ5253BT1 meet automotive qualification standards?
Yes, the MMSZ5253BT1 is AEC−Q101 qualified and PPAP capable, as stated in the "Features" section of the datasheet. The SZ-prefix variant (SZMMSZ5253BT1G) explicitly targets automotive applications, but the standard MMSZ5253BT1 shares identical construction, testing, and qualification-making it suitable for automotive body electronics and infotainment systems requiring certified components.
What is the maximum power dissipation of MMSZ5253BT1 and how does it derate with temperature?
MMSZ5253BT1 is rated for 500 mW total power dissipation on FR−5 board at lead temperature (TL) = 75°C. Above 75°C, it derates linearly at 6.7 mW/°C, reaching zero dissipation at approximately 148°C. This derating curve is defined in the "MAXIMUM RATINGS" table and validated via infrared scan method per Note 2.
Can MMSZ5253BT1 be used in place of MMSZ5253BT1G?
MMSZ5253BT1 and MMSZ5253BT1G are functionally identical except for Pb-free compliance: the "G" suffix denotes RoHS-compliant packaging with matte tin lead finish, while MMSZ5253BT1 (non-G) may use legacy finish. Both share identical electrical specs, SOD−123 package dimensions, and thermal ratings. For new designs, MMSZ5253BT1G is preferred; MMSZ5253BT1 remains viable where legacy finish is acceptable.
What is the reverse leakage current specification for MMSZ5253BT1 at 19 V?
The MMSZ5253BT1 specifies a maximum reverse leakage current (IR) of 0.1 µA at VR = 19 V, as shown in the "5% TOLERANCE FG ELECTRICAL CHARACTERISTICS" table. This low leakage ensures minimal quiescent current draw in voltage-clamp or reference applications, supporting ultra-low-power system design requirements.
MMSZ5253BT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 25 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 35 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 19 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
MMSZ5253BT1 FAQ
1.How can I place an order for MMSZ5253BT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5253BT1 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 MMSZ5253BT1 reliable?
The price and inventory of MMSZ5253BT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5253BT1 is usually 5 days.
3.What payment methods are accepted for MMSZ5253BT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5253BT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5253BT1?
MMSZ5253BT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5253BT1 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 MMSZ5253BT1?
For technical support, including MMSZ5253BT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5253BT1 requirements.
6.How does Aetrix verify that MMSZ5253BT1 is sourced from the original manufacturer or authorized distributors?
All MMSZ5253BT1 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 MMSZ5253BT1 meets industry standards.
7.What is the process for return or replacement of MMSZ5253BT1?
All MMSZ5253BT1 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5253BT1, 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 MMSZ5253BT1 part is unused and in its original packaging.
Return procedure for MMSZ5253BT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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