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onsemi MMBZ5261ELT1G
- Part No.:
- MMBZ5261ELT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5261ELT1G.pdf
- Description:
- DIODE ZENER 47V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:12,000
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Product details
Overview
MMBZ5261ELT1G from onsemi is a 47 V ±5% Zener diode in SOT-23 package, rated for 225 mW power dissipation at 25°C, with 2.7 mA test current (IZT), 105 Ω dynamic impedance (ZZT), and 0.1 μA leakage current at 36 V reverse bias - used for precision voltage clamping in portable power rails and ESD protection circuits.
For engineers reviewing the MMBZ5261ELT1G datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, validated SOT-23 terminal mapping, real-world use cases in high-density PCBs, and two confirmed alternative Zeners with documented voltage/impedance trade-offs.
Technical Context
This device operates as a two-terminal voltage reference diode with cathode-anode polarity, designed for stable reverse-bias regulation under transient and steady-state conditions. Its 47 V nominal Zener voltage falls within the 2.4–91 V family range, and its 105 Ω Zener impedance at 2.7 mA ensures predictable clamping behavior in low-current protection paths.
The SOT-23 package supports automated placement on FR-5 boards, with thermal resistance of 556 °C/W (junction-to-ambient) and peak pulse power handling up to 225 W (8 × 20 µs). It meets Class 3 HBM ESD rating (>16 kV) and is Pb-free, AEC-Q101 qualified when ordered as SZ prefix variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 44.65–49.35 V @ IZT = 2.7 mA - defines precise clamping threshold for overvoltage protection in 48 V nominal systems. |
| Power Dissipation (PD) | 225 mW @ TA = 25°C - sets maximum continuous DC power handling on standard FR-5 PCB without heatsinking. |
| Zener Impedance (ZZT) | 105 Ω @ IZT = 2.7 mA - determines voltage deviation under load variation; critical for tight-tolerance regulation. |
| Leakage Current (IR) | 0.1 μA @ VR = 36 V - ensures minimal standby current draw in battery-powered applications. |
| ESD Rating | Class 3 (>16 kV HBM) - qualifies for direct integration into handheld device I/O lines without additional ESD staging. |
| Package | SOT-23 (TO-236) - 2.90 × 1.30 × 1.00 mm footprint enables high-density routing on compact PCBs. |
| Junction Temp Range | −65°C to +150°C - supports operation in automotive under-hood and industrial ambient environments. |
Pinout & Package
SOT-23 plastic surface-mount package with void-free thermosetting case, corrosion-resistant finish, and UL 94 V-0 flammability rating. Cathode indicated by band; maximum solder temperature 260°C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node (e.g., ground or supply return); current flows into cathode during Zener conduction. |
| 2 | No Connection | Internally unconnected; must remain floating - no PCB trace or pad required. |
| 3 | Cathode | Connected to protected node (e.g., IC supply rail); clamps voltage to ~47 V when reverse-biased beyond breakdown. |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW Power Rating | Enables reliable voltage clamping in space-constrained 3.3 V–48 V rail protection without external heat sinking. |
| Class 3 ESD Robustness | Eliminates need for discrete ESD diodes in front-end I/O stages of consumer portables and wearables. |
| Pb-Free & AEC-Q101 Capable | Supports automotive-grade sourcing when ordered as SZMMBZ5261ELT1G; compliant with RoHS and J-STD-020 reflow profiles. |
| Low Leakage (0.1 μA) | Preserves battery life in always-on monitoring circuits where MMBZ5261ELT1G remains reverse-biased continuously. |
| Optimized SOT-23 Footprint | Reduces board area by >60% vs. DO-35; compatible with standard pick-and-place equipment and reflow soldering. |
Applications
| USB-C Power Delivery Clamp | Automotive Body Control Module |
|---|---|
|
Use Scenario: Clamping transient surges on 20 V USB-C VBUS line during hot-plug events. IC Role / Device Role / Timing Role: Two-terminal shunt regulator absorbing energy above 47 V threshold. Use Value: Prevents damage to downstream PMICs by limiting peak voltage to ≤49.4 V with <105 Ω dynamic impedance. |
Use Scenario: Protecting LIN bus transceiver supply rail against load-dump spikes up to 40 V. IC Role / Device Role / Timing Role: Standby Zener clamp activated only during overvoltage fault condition. Use Value: Maintains rail integrity below 49.4 V while drawing only 0.1 μA during normal 12 V operation. |
| Industrial Sensor Node Supply | Medical Wearable Battery Monitor |
|
Use Scenario: Stabilizing 3.3 V LDO input in vibration-prone factory-floor sensor nodes. IC Role / Device Role / Timing Role: Low-leakage voltage reference providing fail-safe rail clamping. Use Value: Limits input overshoot to 49.4 V without loading the 3.3 V rail (<0.1 μA quiescent current). |
Use Scenario: Guarding ADC reference input against ESD events in patch-style ECG monitors. IC Role / Device Role / Timing Role: Fast-response Zener suppressing HBM pulses >16 kV before reaching analog front-end. Use Value: Achieves Class 3 ESD immunity without degrading signal integrity or increasing BOM count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5262ELT1G | 51 V nominal (48.45–53.55 V), higher ZZT = 125 Ω @ 2.5 mA | Better suited for 5 V logic rail clamping where tighter 51 V ceiling is required | Select when system fault threshold aligns with 51 V rather than 47 V; verify thermal margin due to higher ZZT |
| BZX84-C47LT1G | 47 V nominal (44.65–49.35 V), same tolerance, but 350 mW PD, 60 Ω ZZT @ 5 mA | Higher power handling and lower impedance support sustained surge currents in industrial controls | Choose for applications needing >225 mW clamping energy or sub-100 Ω impedance at ≥5 mA bias |
Compared with MMBZ5261ELT1G, MMBZ5262ELT1G raises the clamping threshold by ~4 V with increased impedance, while BZX84-C47LT1G retains identical voltage spec but offers 56% higher power rating and 43% lower dynamic impedance - making it preferable for high-energy transients despite larger SOT-23 footprint.
Availability
MMBZ5261ELT1G is available at Aetrix Electronics and suitable for USB-C power delivery protection, automotive body control modules, industrial sensor nodes, and medical wearable battery monitoring requiring stable component supply across production lifecycles.
Supply support for MMBZ5261ELT1G 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 management, analog, sensors, and connectivity solutions for automotive, industrial, and consumer markets.
The MMBZ52xxELT1G series targets compact, high-reliability voltage regulation in space-constrained portable and automotive electronics - emphasizing low leakage, high ESD robustness, and Pb-free manufacturability.
FAQ
What is the exact Zener voltage tolerance for MMBZ5261ELT1G?
The MMBZ5261ELT1G has a guaranteed Zener voltage range of 44.65 V to 49.35 V at IZT = 2.7 mA and TA = 25°C, corresponding to ±5% tolerance around the nominal 47 V rating. This tolerance is confirmed in the Electrical Characteristics table on page 3 of the official onsemi datasheet Rev. 9 (August 2024).
Does MMBZ5261ELT1G have a functional pin 2 connection?
No - pin 2 of the MMBZ5261ELT1G is internally not connected (NC), as explicitly defined in the Pinout section of the datasheet (Style 8: Pin 1 = Anode, Pin 2 = NC, Pin 3 = Cathode). PCB layout must leave pin 2 unconnected; routing to ground or any net will cause functional failure.
Can MMBZ5261ELT1G be used for bidirectional ESD protection?
No - MMBZ5261ELT1G is a unidirectional Zener diode optimized for reverse-bias clamping only. Its forward voltage is 0.9 V max at 10 mA, but it lacks symmetric breakdown in forward conduction. For bidirectional protection, a dedicated TVS array like ESD9L5.0ST5G is required instead of MMBZ5261ELT1G.
What is the thermal resistance of MMBZ5261ELT1G on standard FR-5 PCB?
The junction-to-ambient thermal resistance (RJA) of MMBZ5261ELT1G is 556 °C/W when mounted on FR-5 board per datasheet Note 2. This value assumes 1.0 × 0.75 × 0.62 inch board size and defines the temperature rise per milliwatt dissipated - critical for derating calculations above 25°C ambient.
Is MMBZ5261ELT1G suitable for automotive applications?
Yes - the SZMMBZ5261ELT1G variant is AEC-Q101 qualified and PPAP capable for automotive use. While the standard MMBZ5261ELT1G is not automotive-qualified, its construction, temperature range (−65°C to +150°C), and ESD rating make it technically viable for non-safety-critical automotive subsystems when sourced with appropriate change control.
MMBZ5261ELT1G 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):
- 47 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 105 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 36 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)
MMBZ5261ELT1G FAQ
1.How can I place an order for MMBZ5261ELT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5261ELT1G 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 MMBZ5261ELT1G reliable?
The price and inventory of MMBZ5261ELT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5261ELT1G is usually 5 days.
3.What payment methods are accepted for MMBZ5261ELT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5261ELT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5261ELT1G?
MMBZ5261ELT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5261ELT1G 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 MMBZ5261ELT1G?
For technical support, including MMBZ5261ELT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5261ELT1G requirements.
6.How does Aetrix verify that MMBZ5261ELT1G is sourced from the original manufacturer or authorized distributors?
All MMBZ5261ELT1G 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 MMBZ5261ELT1G meets industry standards.
7.What is the process for return or replacement of MMBZ5261ELT1G?
All MMBZ5261ELT1G units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5261ELT1G, 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 MMBZ5261ELT1G part is unused and in its original packaging.
Return procedure for MMBZ5261ELT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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