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onsemi MMBZ5268BLT1G
- Part No.:
- MMBZ5268BLT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5268BLT1G.pdf
- Description:
- DIODE ZENER 82V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,420
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Product details
Overview
MMBZ5268BLT1G from onsemi is a 82 V nominal Zener diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board, with 1.5 mA test current, 2000 Ω dynamic impedance at IZT, and 0.1 μA leakage at 62 V reverse bias - used for precision voltage clamping in portable power rails and ESD-sensitive signal lines.
For engineers reviewing the MMBZ5268BLT1G datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, thermal derating behavior, cathode-anode polarity mapping, and direct alternatives for overvoltage protection design in space-constrained consumer and industrial PCBs.
Technical Context
This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown above its 77.9–86.1 V Zener voltage range (min–max at IZT = 1.5 mA), with temperature coefficient optimized near zero for mid-range Zeners but rising to +6.5 mV/°C typical at 82 V. Its NC (pin 2) terminal isolates internal structure from external routing.
Designed for surface-mount assembly on FR-4/FR-5 boards, it delivers Class 3 ESD robustness (>16 kV HBM) and Pb-free, RoHS-compliant construction. Thermal resistance is 556 °C/W junction-to-ambient on FR-5, requiring derating by 1.8 mW/°C above 25 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 77.9 V min / 82 V nom / 86.1 V max at IZT = 1.5 mA - defines clamping threshold tolerance band for overvoltage protection circuits. |
| Power Dissipation (PD) | 225 mW on FR-5 board at 25°C - sets maximum continuous clamp energy before thermal runaway; derates linearly to zero at ~150°C. |
| Zener Impedance (ZZT) | 2000 Ω max at IZT = 1.5 mA - indicates voltage regulation stiffness; higher impedance implies greater output voltage shift under load variation. |
| Leakage Current (IR) | 0.1 μA max at VR = 62 V - ensures minimal standby current draw in high-impedance bias networks prior to breakdown. |
| ESD Rating | Class 3 (>16 kV) per Human Body Model - qualifies for direct placement on I/O lines exposed to user-handling ESD events. |
| Junction Temp Range | −65°C to +150°C - supports operation in automotive under-hood and industrial outdoor environments without derating. |
Pinout & Package
SOT-23 (TO-236) plastic surface-mount package, 2.90 × 1.30 × 1.00 mm body, 1.90 mm lead pitch; cathode indicated by band; pin 2 is internally not connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node; reverse-biased during Zener operation; must be routed to ground or return path. |
| 2 | No Connection | Internally unconnected; no PCB trace or pad required; avoids accidental shorting in layout. |
| 3 | Cathode | Connected to protected rail or signal line; carries full clamp current during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW FR-5 Power Rating | Enables compact overvoltage protection without heatsinking in handheld PCBs where board area is constrained. |
| Class 3 ESD Robustness | Eliminates need for external ESD suppressors on low-speed data lines like I²C or GPIO in consumer electronics. |
| Pb-Free & RoHS Compliant | Meets global environmental compliance requirements for export and OEM manufacturing without process requalification. |
| Void-Free Mold Compound | Ensures mechanical reliability and thermal stability during reflow soldering and long-term thermal cycling. |
Applications
| USB Port Protection | Smartphone Battery Monitoring |
|---|---|
Use Scenario: Clamps transient surges on USB VBUS line during hot-plug or ESD events. IC Role / Device Role / Timing Role: Two-terminal shunt regulator providing fast (<1 ns response) voltage limiting at 82 V. Use Value: Prevents damage to USB controller ICs rated for ≤20 V absolute maximum, using only one passive component. |
Use Scenario: Stabilizes reference voltage for fuel-gauge ADC input in lithium-ion battery packs. IC Role / Device Role / Timing Role: Precision Zener acting as stable 82 V clamp to protect ADC front-end from pack overvoltage faults. Use Value: Maintains measurement integrity during cell imbalance events without adding active circuitry or calibration drift. |
| Industrial Sensor Signal Conditioning | Automotive Infotainment I/O Protection |
Use Scenario: Limits induced transients on 4–20 mA loop-powered sensor outputs exposed to motor noise. IC Role / Device Role / Timing Role: Passive overvoltage clamp placed across analog output terminals. Use Value: Survives repetitive 1 kV surge pulses per IEC 61000-4-5 while preserving loop accuracy below 82 V. |
Use Scenario: Protects HDMI or LVDS display interface pins from cable discharge events in car dashboards. IC Role / Device Role / Timing Role: ESD-suppression diode with 82 V standoff, placed adjacent to connector. Use Value: Passes AEC-Q101 qualification and withstands >16 kV HBM without parameter shift or failure. |
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 on FR-4 and 100 Ω ZZT at 5 mA - lower impedance, higher power, different test current. | Preferred where tighter voltage regulation under varying load is required; less suitable for ultra-low-leakage bias networks. | Select when lower dynamic impedance and higher surge capability are prioritized over minimal footprint and ultra-low leakage. |
| SZMMBZ5268BLT1G | Identical electrical specs, but AEC-Q101 qualified and PPAP-capable with SZ prefix - same Zener voltage, thermal, and ESD performance. | Required for automotive production programs needing certified components with controlled change management and traceability. | Choose for automotive Tier-1 designs where qualification documentation and supply-chain control are mandatory. |
Compared with MMBZ5268BLT1G, BZX84-C82LT1G offers superior regulation stiffness but larger thermal footprint, while SZMMBZ5268BLT1G provides identical performance with automotive-grade process controls and documentation - enabling drop-in use where qualification is mandated.
Availability
MMBZ5268BLT1G is available at Aetrix Electronics and suitable for USB port protection, smartphone battery monitoring, industrial sensor signal conditioning, and automotive infotainment I/O protection requiring stable component supply across high-mix, low-volume production runs.
Supply support for MMBZ5268BLT1G 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 is a global semiconductor supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications - focused on enabling sustainable electronics through high-reliability components.
The MMBZ52xxBLT1G series belongs to onsemi's precision Zener regulator product line, engineered specifically for space-constrained, high-density PCBs in portable and battery-powered systems requiring reliable voltage clamping and ESD immunity.
FAQ
What is the Zener voltage tolerance of MMBZ5268BLT1G at 25°C?
The MMBZ5268BLT1G has a Zener voltage range of 77.9 V (minimum) to 86.1 V (maximum) at test current IZT = 1.5 mA and ambient temperature 25°C, yielding a ±5% nominal tolerance around its 82 V typical value. This tolerance reflects manufacturing spread and must be accounted for in overvoltage protection margin calculations.
Does MMBZ5268BLT1G have a functional pin 2 connection?
No, pin 2 of the MMBZ5268BLT1G is internally not connected (NC), as confirmed in the datasheet's marking diagram and mechanical outline (Style 8). It must remain unconnected on the PCB - routing or soldering to pin 2 risks mechanical stress or unintended coupling without electrical benefit.
How does thermal derating affect MMBZ5268BLT1G's power handling?
MMBZ5268BLT1G dissipates 225 mW at 25°C on FR-5 board, but derates linearly by 1.8 mW/°C above that temperature. At 85°C ambient, usable power drops to 117 mW - meaning sustained clamping at full 225 mW requires active cooling or reduced ambient, critical for enclosed industrial enclosures.
Is MMBZ5268BLT1G suitable for automotive applications?
The standard MMBZ5268BLT1G is not AEC-Q101 qualified; however, its automotive-grade variant SZMMBZ5268BLT1G shares identical electrical specs and adds PPAP capability, controlled change management, and full qualification - making it the compliant choice for automotive infotainment or body electronics.
What is the maximum leakage current specification for MMBZ5268BLT1G?
MMBZ5268BLT1G specifies a maximum reverse leakage current (IR) of 0.1 μA at VR = 62 V and TA = 25°C. This ultra-low leakage enables use in high-impedance bias networks and precision reference circuits where standby current must remain sub-nanoampere.
MMBZ5268BLT1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
MMBZ5268BLT1G FAQ
1.How can I place an order for MMBZ5268BLT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5268BLT1G 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 MMBZ5268BLT1G reliable?
The price and inventory of MMBZ5268BLT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5268BLT1G is usually 5 days.
3.What payment methods are accepted for MMBZ5268BLT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5268BLT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5268BLT1G?
MMBZ5268BLT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5268BLT1G 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 MMBZ5268BLT1G?
For technical support, including MMBZ5268BLT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5268BLT1G requirements.
6.How does Aetrix verify that MMBZ5268BLT1G is sourced from the original manufacturer or authorized distributors?
All MMBZ5268BLT1G 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 MMBZ5268BLT1G meets industry standards.
7.What is the process for return or replacement of MMBZ5268BLT1G?
All MMBZ5268BLT1G units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5268BLT1G, 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 MMBZ5268BLT1G part is unused and in its original packaging.
Return procedure for MMBZ5268BLT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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