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onsemi MMSZ5235BT3
- Part No.:
- MMSZ5235BT3
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5235BT3.pdf
- Description:
- DIODE ZENER 6.8V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:7,513
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Product details
Overview
MMSZ5235BT3 from ON Semiconductor is a 6.8 V ±5% Zener diode in SOD−123 package, rated for 500 mW power dissipation on FR−5 board at 75°C, with 5 Ω dynamic impedance at 20 mA test current and 3 µA reverse leakage at 5 V, used for precision voltage regulation and reference in low-power analog circuits.
For engineers reviewing the MMSZ5235BT3 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 and overvoltage protection circuits.
Technical Context
This device operates as a two-terminal silicon Zener diode with controlled reverse breakdown at nominal 6.8 V under thermal equilibrium (TL = 30°C ±1°C), specified with 20 mA Zener test current (IZT) and 0.25 mA knee current (IZK). Its 750 Ω maximum impedance at IZK ensures stable regulation at low bias.
Thermal resistance is 340°C/W junction-to-ambient and 150°C/W junction-to-lead, enabling predictable power derating above 75°C (6.7 mW/°C). The SOD−123 package supports automated assembly and meets UL 94 V−0 flammability rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 6.46–7.14 V @ 20 mA - defines regulated output range for reference or clamp applications |
| Power Dissipation | 500 mW @ TL = 75°C - sets maximum continuous DC power on standard PCB |
| Zener Impedance | 5 Ω @ IZT = 20 mA - ensures minimal output voltage variation under load changes |
| Reverse Leakage | 3 µA @ VR = 5 V - guarantees low standby current in battery-powered circuits |
| Junction Temp Range | −55°C to +150°C - supports operation in automotive under-hood and industrial environments |
| ESD Rating | Class 3 (>16 kV HBM) - enables robust handling during manual assembly and field use |
Pinout & Package
SOD−123 surface-mount plastic package (Case 425, Style 1), cathode indicated by polarity band; dimensions: 2.54–2.84 mm length × 1.40–1.80 mm width × 0.94–1.35 mm height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Cathode) | Zener anode connection point | Connected to regulated voltage node; reverse-biased during operation |
| 2 (Anode) | Zener cathode connection point | Connected to circuit ground or lower potential reference |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW FR−5 Board Rating | Enables stable voltage reference without heatsinking in compact PCB layouts |
| ±5% Zener Tolerance | Provides predictable regulation accuracy for cost-sensitive consumer and industrial designs |
| ESD >16 kV (HBM) | Eliminates need for external ESD protection in handheld and portable equipment |
| Pb−Free Construction | Complies with RoHS and ELV directives without compromising solder joint reliability |
Applications
| Power Supply Reference | Overvoltage Clamp |
|---|---|
Use Scenario: Providing stable 6.8 V reference for ADC voltage dividers and op-amp bias networks in sensor signal conditioning modules. IC Role / Device Role / Timing Role: Two-terminal shunt regulator establishing precise DC reference voltage independent of supply variation. Use Value: Maintains <±10 mV drift over −40°C to +85°C due to low temperature coefficient (≈+2.5 mV/°C) near 6.8 V. | Use Scenario: Protecting microcontroller GPIO pins from transient overvoltage events in industrial control I/O modules. IC Role / Device Role / Timing Role: Passive clamping element diverting surge current when input exceeds 7.14 V. Use Value: Limits peak voltage to ≤7.14 V with <5 Ω dynamic impedance, reducing stress on downstream CMOS inputs. |
| Low-Power Sensor Bias | Current Source Stabilization |
Use Scenario: Biasing photodiode amplifiers and RTD bridge circuits where ultra-low quiescent current is critical. IC Role / Device Role / Timing Role: Low-leakage (3 µA @ 5 V) voltage reference enabling sub-µA system sleep modes. Use Value: Enables battery life extension in wireless sensor nodes by minimizing standby current draw. | Use Scenario: Stabilizing constant-current source for LED drivers and laser diode bias in optical transceivers. IC Role / Device Role / Timing Role: Shunt regulator maintaining fixed voltage across current-setting resistor. Use Value: Achieves <1% current variation over input voltage range due to 5 Ω Zener impedance. |
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-C6V8 | Same 6.8 V ±5%, but SOD-323 package (smaller footprint, 200 mW rating) | Lower power handling limits use in high-current reference or clamp roles | Select when board space is constrained and power demand ≤200 mW |
| MMSZ4686T1G | 6.8 V ±5%, identical SOD−123 package, but 350 mW rating and higher ZZT (10 Ω) | Reduced regulation stability under dynamic load due to higher impedance | Choose only if legacy BOM compatibility outweighs regulation performance needs |
Compared with MMSZ5235BT3, BZX584-C6V8 offers smaller size but sacrifices 300 mW power margin, while MMSZ4686T1G shares the same footprint but degrades regulation accuracy-making MMSZ5235BT3 optimal for 500 mW, low-impedance reference designs.
Availability
MMSZ5235BT3 is available at Aetrix Electronics and suitable for voltage reference, overvoltage protection, low-power sensor bias, and current source stabilization requiring stable component supply and full traceability.
Supply support for MMSZ5235BT3 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, sensing, and connectivity solutions for automotive, industrial, and consumer markets.
The MMSZ52xxxT1G series was designed specifically for high-density, surface-mount voltage regulation in cost-sensitive, thermally constrained applications-emphasizing manufacturability, reliability, and Pb-free compliance.
FAQ
What is the exact Zener voltage tolerance for MMSZ5235BT3?
The MMSZ5235BT3 has a ±5% tolerance on its nominal 6.8 V Zener voltage, meaning the actual measured voltage at 20 mA test current falls between 6.46 V and 7.14 V under thermal equilibrium conditions (TL = 30°C ±1°C), as confirmed in the ON Semiconductor datasheet revision 15.
Does MMSZ5235BT3 support automotive-grade applications?
Yes, the SZ-prefix variant (SZMMSZ5235BT3G) is AEC−Q101 qualified and PPAP capable, but the standard MMSZ5235BT3 is not automotive-qualified. For automotive use, specify the SZ prefix and verify qualification status via ON Semiconductor's official documentation before design-in.
What is the maximum reverse leakage current for MMSZ5235BT3 at 5 V?
The MMSZ5235BT3 exhibits a maximum reverse leakage current of 3 µA at VR = 5 V, as specified in the 5% tolerance electrical characteristics table. This low leakage supports energy-efficient operation in battery-powered systems where standby current must be minimized.
Can MMSZ5235BT3 be used in place of MMSZ5235BT1G?
Yes, MMSZ5235BT3 and MMSZ5235BT1G share identical electrical specifications and SOD−123 packaging; the only difference is tape-and-reel quantity-3,000 units per reel for BT1G versus 10,000 for BT3G. Both are Pb−free and fully interchangeable in circuit design and layout.
What is the thermal resistance junction-to-ambient for MMSZ5235BT3?
The thermal resistance junction-to-ambient (RJA) for MMSZ5235BT3 is 340°C/W, measured on FR−5 board using the infrared scan method. This value governs power derating above 75°C at 6.7 mW/°C and informs thermal layout decisions for sustained 500 mW operation.
MMSZ5235BT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 6.8 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 5 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 5 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
MMSZ5235BT3 FAQ
1.How can I place an order for MMSZ5235BT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5235BT3 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 MMSZ5235BT3 reliable?
The price and inventory of MMSZ5235BT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5235BT3 is usually 5 days.
3.What payment methods are accepted for MMSZ5235BT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5235BT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5235BT3?
MMSZ5235BT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5235BT3 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 MMSZ5235BT3?
For technical support, including MMSZ5235BT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5235BT3 requirements.
6.How does Aetrix verify that MMSZ5235BT3 is sourced from the original manufacturer or authorized distributors?
All MMSZ5235BT3 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 MMSZ5235BT3 meets industry standards.
7.What is the process for return or replacement of MMSZ5235BT3?
All MMSZ5235BT3 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5235BT3, 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 MMSZ5235BT3 part is unused and in its original packaging.
Return procedure for MMSZ5235BT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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