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onsemi MMSZ5266BT3
- Part No.:
- MMSZ5266BT3
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- SOD-123
- Datasheet:
-
MMSZ5266BT3.pdf
- Description:
- DIODE ZENER 68V 500MW SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:6,217
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Product details
Overview
MMSZ5266BT3 from onsemi is a 68 V ±5% Zener diode in SOD−123 package, rated for 500 mW power dissipation at TL = 75°C with 1.8 mA test current (IZT), 230 Ω dynamic impedance (ZZT), and 0.1 µA reverse leakage at 52 V (VR). It serves as a precision voltage reference or overvoltage clamp in low-power analog sensing and power rail regulation circuits.
For engineers reviewing the MMSZ5266BT3 datasheet, pinout, applications, or equivalent options, key selection criteria include its 68 V nominal Zener voltage, ±5% tolerance, thermal equilibrium–specified VZ, 150°C max junction temperature, and Pb-free SOD−123 surface-mount construction suitable for automated assembly.
Technical Context
This device operates as a two-terminal silicon Zener diode, conducting in reverse breakdown to maintain stable voltage across its terminals under controlled current conditions. Its Zener voltage is specified with the device junction in thermal equilibrium at TL = 30°C ±1°C, ensuring repeatable calibration independent of transient thermal gradients.
The MMSZ5266BT3 exhibits a typical temperature coefficient of +0.094 %/°C (derived from Figure 1 & 2 for ~68 V devices), supports ESD robustness >16 kV per HBM Class 3, and maintains 0.1 µA leakage at VR = 52 V - critical for low-quiescent-current bias networks and high-impedance reference nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 64.6–71.4 V @ IZT = 1.8 mA - defines clamping threshold with ±5% tolerance for stable reference generation |
| Power Dissipation (PD) | 500 mW on FR-5 board @ TL = 75°C - sets maximum continuous power handling before thermal derating begins |
| Zener Impedance (ZZT) | 230 Ω @ IZT = 1.8 mA - indicates voltage regulation stiffness; lower values improve load regulation |
| Reverse Leakage (IR) | 0.1 µA @ VR = 52 V - ensures minimal error current in high-impedance voltage divider or bias applications |
| Junction Temp Range | −55°C to +150°C - enables operation in automotive under-hood, industrial control, and outdoor electronics |
| ESD Rating | Class 3 (>16 kV) HBM - provides robustness against handling-induced electrostatic discharge during assembly |
| Package | SOD−123 (Case 425) - compact 2.54 mm × 1.35 mm surface-mount footprint optimized for high-density PCB layouts |
Pinout & Package
SOD−123 plastic surface-mount package with cathode indicated by polarity band; void-free thermosetting case, UL 94 V−0 flammability rating, and 260°C/10s maximum soldering temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Banded End) | Cathode | Connected to higher-potential node in reverse-bias configuration; carries regulated output voltage |
| 2 (Non-banded End) | Anode | Connected to lower-potential node (e.g., ground or return path); completes Zener conduction loop |
Key Features
| Feature | Design Value |
|---|---|
| 500 mW Power Rating | Enables use in medium-current reference and protection circuits without external heat sinking on standard FR-5 PCB |
| ±5% Zener Tolerance | Provides predictable voltage accuracy for cost-sensitive industrial and consumer applications where tight regulation is not required |
| Thermal Equilibrium VZ Spec | Ensures Zener voltage is measured under stabilized thermal conditions, eliminating transient self-heating artifacts in datasheet specs |
| Pb-Free Construction | Meets RoHS Directive 2011/65/EU and supports lead-free reflow soldering processes without compromising reliability |
| Automated Assembly Optimized | Standardized SOD−123 footprint and marking allow direct integration into pick-and-place workflows with high placement yield |
Applications
| Industrial Sensor Signal Conditioning | Low-Power Microcontroller Voltage Reference |
|---|---|
Use Scenario: Stabilizing excitation voltage for resistive bridge sensors in PLC analog input modules operating from unregulated 24 V rails. IC Role / Device Role / Timing Role: Zener diode providing fixed 68 V reference for op-amp gain-setting network and ADC reference scaling. Use Value: Maintains sensor linearity within ±0.5% over −40°C to +85°C ambient due to known TC and low IR drift. | Use Scenario: Generating a stable bias point for ultra-low-power MCU reset supervisor ICs powered from battery-backed 3.3 V supplies. IC Role / Device Role / Timing Role: Reverse-biased Zener acting as precision shunt regulator to derive clean 3.3 V reference from higher-voltage auxiliary rail. Use Value: Delivers <0.1 µA leakage at 2.5 V reverse bias, preserving battery life while enabling accurate brown-out detection. |
| Automotive Body Control Module Clamp | IoT Node Overvoltage Protection |
Use Scenario: Protecting LIN transceiver inputs against load-dump transients up to 60 V in 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: Shunt clamp limiting voltage spikes to safe levels before they reach sensitive interface ICs. Use Value: Responds within nanoseconds to 100 ms surges, dissipating peak energy without degradation per AEC-Q101 qualification. | Use Scenario: Safeguarding USB-C PD negotiation circuitry in smart home hubs exposed to accidental 20 V adapter misconnection. IC Role / Device Role / Timing Role: Standby-mode Zener absorbing excess voltage to prevent latch-up in USB controller ICs. Use Value: Withstands 0.1 µA leakage at 52 V, ensuring no false trigger during normal 5 V operation while clamping >60 V faults. |
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-C68LT1G | Same 68 V ±5%, but SOT-23 package (larger footprint, higher RJA = 350°C/W vs 340°C/W) | Less suitable for ultra-high-density layouts; slightly lower thermal performance on FR-4 | Select when existing SOT-23 land pattern is fixed and 68 V regulation is required |
| MMSZ5266ET3G | Identical electrical specs and SOD−123 package, but ±2% tolerance (tighter VZ control) | Used where tighter voltage accuracy is needed, e.g., precision ADC references or calibration circuits | Choose when system-level tolerance budget requires <±3% total error, accepting higher cost |
Compared with MMSZ5266BT3, BZX84-C68LT1G offers identical Zener voltage but requires PCB layout change due to SOT-23 footprint and has marginally worse thermal resistance; MMSZ5266ET3G delivers superior voltage accuracy in the same SOD−123 package but increases BOM cost for tighter tolerance.
Availability
MMSZ5266BT3 is available at Aetrix Electronics and suitable for industrial sensor conditioning, automotive body control modules, and IoT node overvoltage protection requiring stable component supply and AEC-Q101 qualified parts.
Supply support for MMSZ5266BT3 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 (formerly 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 is designed for general-purpose, medium-current Zener regulation in space-constrained surface-mount applications, emphasizing manufacturability, thermal stability, and broad voltage coverage from 2.4 V to 110 V.
FAQ
What is the nominal Zener voltage and tolerance of the MMSZ5266BT3?
The MMSZ5266BT3 has a nominal Zener voltage of 68 V with a ±5% tolerance, meaning its actual breakdown voltage falls between 64.6 V and 71.4 V when measured at IZT = 1.8 mA under thermal equilibrium conditions. This tolerance is confirmed in the "5% TOLERANCE FG ELECTRICAL CHARACTERISTICS" table on page 3 of the official onsemi datasheet.
Does the MMSZ5266BT3 meet automotive qualification standards?
Yes, the MMSZ5266BT3 is AEC−Q101 qualified and PPAP capable, as explicitly stated in the "Features" section of the datasheet. The SZ-prefix variants (e.g., SZMMSZ5266BT3G) are designated for automotive applications, but the standard MMSZ5266BT3 shares the same qualification and process controls per onsemi's documentation.
What is the maximum reverse leakage current for the MMSZ5266BT3, and at what voltage is it specified?
The MMSZ5266BT3 exhibits a maximum reverse leakage current (IR) of 0.1 µA at VR = 52 V, as listed in the "5% TOLERANCE FG ELECTRICAL CHARACTERISTICS" table. This value is critical for low-power bias networks and ensures minimal parasitic current draw in high-impedance reference designs.
Can the MMSZ5266BT3 be used in high-density PCB layouts?
Yes, the MMSZ5266BT3 uses the compact SOD−123 surface-mount package (2.54 mm × 1.35 mm), specifically engineered for high-density applications. Its standardized footprint, polarity band marking, and Pb-free construction are optimized for automated board assembly, making it suitable for densely populated consumer and industrial PCBs.
What is the thermal resistance junction-to-ambient (RJA) for the MMSZ5266BT3?
The thermal resistance junction-to-ambient (RJA) for the MMSZ5266BT3 is 340°C/W, measured via infrared scan method on FR−5 board (Note 2 in Maximum Ratings table). This value determines how much the junction temperature rises above ambient per milliwatt of dissipated power, directly impacting safe operating area in continuous-use applications.
MMSZ5266BT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 68 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 230 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 52 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
MMSZ5266BT3 FAQ
1.How can I place an order for MMSZ5266BT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMSZ5266BT3 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 MMSZ5266BT3 reliable?
The price and inventory of MMSZ5266BT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMSZ5266BT3 is usually 5 days.
3.What payment methods are accepted for MMSZ5266BT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMSZ5266BT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMSZ5266BT3?
MMSZ5266BT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMSZ5266BT3 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 MMSZ5266BT3?
For technical support, including MMSZ5266BT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMSZ5266BT3 requirements.
6.How does Aetrix verify that MMSZ5266BT3 is sourced from the original manufacturer or authorized distributors?
All MMSZ5266BT3 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 MMSZ5266BT3 meets industry standards.
7.What is the process for return or replacement of MMSZ5266BT3?
All MMSZ5266BT3 units undergo pre-shipment inspection (PSI). If there is an issue with MMSZ5266BT3, 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 MMSZ5266BT3 part is unused and in its original packaging.
Return procedure for MMSZ5266BT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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