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onsemi MMBZ5268BLT1
- Part No.:
- MMBZ5268BLT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5268BLT1.pdf
- Description:
- DIODE ZENER 82V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,009
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Product details
Overview
MMBZ5268BLT1 from onsemi is a 82 V ±5% Zener diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board at 25°C, with 1.5 mA test current, 2000 Ω dynamic impedance at IZT, and 0.1 μA leakage current at 62 V reverse bias - used for precision voltage clamping in portable power rails and ESD-sensitive signal lines.
For engineers reviewing the MMBZ5268BLT1 datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage tolerance, thermal resistance (556 °C/W), human-body-model ESD rating (>16 kV), cathode-anode polarity marking, and compatibility with high-density automated assembly on FR-4/FR-5 PCBs.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown at precisely defined Zener voltage (77.9–86.1 V) when biased above its knee current (IZK = 1.5 mA). Its low leakage (<0.1 μA at VR = 62 V) and stable temperature coefficient support accurate clamping in battery-powered systems.
The SOT-23 package features a defined pinout (Pin 1: Anode, Pin 2: No Connection, Pin 3: Cathode), corrosion-resistant finish, UL 94 V-0 flammability rating, and 260°C soldering tolerance for 10 seconds - enabling reliable reflow integration into compact, high-volume consumer electronics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 77.9 V min / 82 V nom / 86.1 V max @ IZT = 1.5 mA - defines clamping threshold for overvoltage protection circuits |
| Power Dissipation (PD) | 225 mW on FR-5 board @ 25°C - limits continuous energy handling in space-constrained layouts |
| Zener Impedance (ZZT) | 2000 Ω max @ IZT = 1.5 mA - determines voltage regulation stability under varying load currents |
| Leakage Current (IR) | 0.1 μA max @ VR = 62 V - ensures minimal standby power loss in always-on circuits |
| ESD Rating | Class 3 (>16 kV) per Human Body Model - provides intrinsic transient immunity without external TVS stacking |
| Thermal Resistance (RJA) | 556 °C/W on FR-5 board - dictates maximum ambient temperature rise under full power operation |
| Junction Temperature Range | −65°C to +150°C - supports operation in automotive under-hood and industrial environments |
Pinout & Package
SOT-23 (TO-236) surface-mount package, 2.90 mm × 1.30 mm × 1.00 mm body size, void-free thermosetting plastic case with corrosion-resistant, easily solderable finish; polarity indicated by cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Forward-biased terminal; connects to lower-potential node during clamping |
| Pin 2 | No Connection | Internally unconnected; must remain floating - no PCB trace or pad required |
| Pin 3 | Cathode | Reverse-biased terminal; connects to protected node or voltage rail for clamping |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW Power Rating | Enables compact overvoltage protection in space-limited handheld devices without heatsinking |
| ESD Class 3 Compliance | Eliminates need for discrete HBM-level TVS diodes in USB, audio, and sensor interface paths |
| Pb-Free, Halogen-Free, RoHS Compliant | Meets global environmental compliance requirements for consumer and industrial end products |
| Optimized SOT-23 Footprint | Supports 0.65 mm pitch pick-and-place and reflow soldering on high-density PCBs |
| Wide Zener Voltage Range (2.4–91 V) | Allows single-package family coverage across multiple supply rail voltages in one BOM |
Applications
| USB Data Line Protection | Li-ion Battery Voltage Clamp |
|---|---|
Use Scenario: Protecting USB 2.0 D+ and D− lines from ESD events and transient surges in smartphones and accessories. IC Role / Device Role / Timing Role: Zener clamping diode placed between data line and ground to shunt transients exceeding 82 V. Use Value: Leverages 82 V Zener threshold and >16 kV HBM rating to absorb IEC 61000-4-2 contact discharge without signal distortion. |
Use Scenario: Preventing overvoltage damage to fuel gauge ICs and charging controllers during fast-charge termination or pack imbalance. IC Role / Device Role / Timing Role: Parallel-connected voltage clamp across 3S Li-ion stack (nominal 12.6 V, max ~13.2 V) to limit transient spikes. Use Value: Uses low leakage (0.1 μA) and tight 77.9–86.1 V tolerance to avoid false triggering while ensuring robust 150°C junction survival. |
| Industrial Sensor Signal Conditioning | Automotive Infotainment Power Rail Clamp |
Use Scenario: Stabilizing analog output of pressure or temperature sensors exposed to load-dump transients in factory automation modules. IC Role / Device Role / Timing Role: Reverse-biased Zener referenced to system ground, clamping sensor output to 82 V during 12 V rail disturbances. Use Value: Combines 556 °C/W thermal resistance and −65°C to +150°C operating range for reliability in uncontrolled ambient conditions. |
Use Scenario: Suppressing load-dump transients on 12 V accessory power rails in head units and display modules. IC Role / Device Role / Timing Role: Primary clamping element on switched 12 V input, sized to handle short-duration 60 V pulses per ISO 7637-2. Use Value: Delivers precise 82 V clamping with 2000 Ω dynamic impedance to prevent overshoot beyond downstream regulator input ratings. |
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-C82LT1G | Same 82 V nominal Zener, but 350 mW rating and 600 Ω ZZT - higher power, lower impedance | Better suited for higher-energy transients; requires larger thermal relief on PCB | Select when clamping duty cycle exceeds 225 mW derating limits or lower dynamic impedance is critical |
| SZMMBZ5268BLT1G | Identical electrical specs, AEC-Q101 qualified, automotive PPAP-capable - same Zener voltage, tighter process controls | Required for automotive ECUs and infotainment systems needing certified reliability | Choose for automotive-grade designs where qualification documentation and change control are mandatory |
Compared with MMBZ5268BLT1, BZX84-C82LT1G offers higher power margin and lower impedance for demanding transients, while SZMMBZ5268BLT1G delivers identical clamping performance with automotive qualification - neither is pin-compatible due to different marking and qualification status, but both share the same SOT-23 footprint and pinout.
Availability
MMBZ5268BLT1 is available at Aetrix Electronics and suitable for USB interface protection, Li-ion battery management, industrial sensor conditioning, and automotive infotainment power rail clamping requiring stable component supply across production lifecycles.
Supply support for MMBZ5268BLT1 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 specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The MMBZ52xxBLT1G series is designed for compact, high-reliability voltage regulation and transient suppression in portable and space-constrained electronics - emphasizing low-profile packaging, high ESD immunity, and broad Zener voltage coverage.
FAQ
What is the exact Zener voltage tolerance for MMBZ5268BLT1?
The MMBZ5268BLT1 has a guaranteed Zener voltage range of 77.9 V (minimum) to 86.1 V (maximum) at test current IZT = 1.5 mA, corresponding to ±5% tolerance around the nominal 82 V value. This tolerance is specified at 25°C ambient and applies to all units in the production lot per onsemi's Electrical Characteristics table on page 3 of the datasheet.
Does MMBZ5268BLT1 have a functional third pin?
No, MMBZ5268BLT1 has only two active terminals: Pin 1 is the anode and Pin 3 is the cathode; Pin 2 is explicitly designated as "No Connection" in the mechanical outline (Style 8) and must remain unconnected on the PCB. This internal NC configuration is confirmed in the datasheet's marking diagram and package style table on page 6.
What is the maximum allowable junction temperature for MMBZ5268BLT1?
The MMBZ5268BLT1 has a specified junction and storage temperature range of −65°C to +150°C. This maximum junction temperature of +150°C is validated under steady-state thermal conditions and allows operation in under-hood automotive and industrial environments where ambient temperatures exceed 100°C, provided power dissipation remains within derated limits.
How does the ESD rating of MMBZ5268BLT1 compare to standard HBM requirements?
The MMBZ5268BLT1 is rated Class 3 per JEDEC JS-001, meaning it withstands >16 kV human-body-model ESD stress - exceeding the 8 kV minimum for Class 2 and qualifying it for direct placement on ESD-prone interfaces like USB, audio jacks, and sensor inputs without supplemental protection components.
Is MMBZ5268BLT1 compatible with lead-free reflow soldering processes?
Yes, MMBZ5268BLT1 is Pb-free, halogen-free, and RoHS compliant, with a maximum soldering temperature rating of 260°C for 10 seconds - fully compatible with standard lead-free reflow profiles (e.g., IPC/JEDEC J-STD-020) used for SnAgCu alloys. The package finish is corrosion-resistant and easily solderable per datasheet Mechanical Characteristics.
MMBZ5268BLT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 82 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 330 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 62 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:
- SOT-23-3 (TO-236)
MMBZ5268BLT1 FAQ
1.How can I place an order for MMBZ5268BLT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5268BLT1 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 MMBZ5268BLT1 reliable?
The price and inventory of MMBZ5268BLT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5268BLT1 is usually 5 days.
3.What payment methods are accepted for MMBZ5268BLT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5268BLT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5268BLT1?
MMBZ5268BLT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5268BLT1 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 MMBZ5268BLT1?
For technical support, including MMBZ5268BLT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5268BLT1 requirements.
6.How does Aetrix verify that MMBZ5268BLT1 is sourced from the original manufacturer or authorized distributors?
All MMBZ5268BLT1 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 MMBZ5268BLT1 meets industry standards.
7.What is the process for return or replacement of MMBZ5268BLT1?
All MMBZ5268BLT1 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5268BLT1, 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 MMBZ5268BLT1 part is unused and in its original packaging.
Return procedure for MMBZ5268BLT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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