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onsemi MMBZ5261ELT1
- Part No.:
- MMBZ5261ELT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5261ELT1.pdf
- Description:
- DIODE ZENER 47V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,148
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Product details
Overview
MMBZ5261ELT1 from onsemi is a 47 V ±5% Zener voltage regulator diode in SOT-23 package, rated for 225 mW power dissipation at 25°C on FR-5 board, 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 reference and overvoltage protection in portable power rails.
For engineers reviewing the MMBZ5261ELT1 datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage tolerance, thermal resistance (556 °C/W), ESD rating (>16 kV HBM), peak pulse power (225 W), and SOT-23 footprint compatibility with high-density PCB layouts.
Technical Context
This device operates as a two-terminal voltage reference, conducting in reverse breakdown at its specified Zener voltage (47 V nominal) with tightly controlled tolerance (±5%) and low dynamic impedance (105 Ω @ IZT = 2.7 mA). It exhibits a temperature coefficient of +3.5 mV/°C (typical for ~47 V devices per Figure 1), enabling stable regulation across −65°C to +150°C junction range.
The SOT-23 package features a defined pinout (Pin 1: Anode, Pin 2: No Connection, Pin 3: Cathode), polarity band marking, and UL 94 V-0 flammability rating. Its 225 mW DC power rating derates linearly above 25°C (1.8 mW/°C on FR-5), and it supports transient surge handling up to 225 W (8 × 20 µs pulse).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 44.65 V (min) to 49.35 V (max) at IZT = 2.7 mA - defines usable regulation window under standard test conditions |
| Power Dissipation (PD) | 225 mW @ TA = 25°C on FR-5 board - sets maximum continuous DC power before thermal derating applies |
| Zener Impedance (ZZT) | 105 Ω @ IZT = 2.7 mA - indicates regulation stiffness; lower values improve load regulation accuracy |
| Leakage Current (IR) | 0.1 μA @ VR = 36 V - ensures minimal standby current draw in undervoltage clamp or biasing circuits |
| ESD Rating | Class 3 (>16 kV) per Human Body Model - enables robust handling in automated assembly and end-use environments |
| Thermal Resistance (RJA) | 556 °C/W on FR-5 board - determines junction temperature rise under steady-state power dissipation |
| Peak Pulse Power | 225 W (8 × 20 µs) - supports transient overvoltage suppression without failure in surge-prone interfaces |
Pinout & Package
SOT-23 (TO-236) surface-mount plastic package, 2.90 mm × 1.30 mm × 1.00 mm body size, void-free thermosetting case, corrosion-resistant finish, UL 94 V-0 rated, cathode indicated by polarity band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Connected to lower-potential side of regulated node; reverse-biased during Zener operation |
| Pin 2 | No Connection | Internally unconnected; must remain floating - no PCB trace or pad required |
| Pin 3 | Cathode | Connected to higher-potential side (e.g., supply rail); polarity band identifies this terminal |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW DC power rating | Enables compact voltage clamping in space-constrained portable electronics without heatsinking |
| ESD robustness >16 kV HBM | Eliminates need for external ESD protection in handheld device front-end circuits |
| Pb-free SOT-23 package | Meets RoHS compliance requirements and supports lead-free reflow soldering profiles (260°C/10 s) |
| Low leakage (0.1 μA @ 36 V) | Minimizes quiescent current in battery-powered systems where standby drain must be sub-µA |
| Stable Zener voltage tolerance (±5%) | Reduces calibration overhead in precision reference applications such as ADC biasing or sensor excitation |
Applications
| USB Port Overvoltage Protection | Smartphone Battery Monitoring Reference |
|---|---|
|
Use Scenario: Clamp transient surges on USB VBUS line during hot-plug or ESD events. IC Role / Device Role / Timing Role: Two-terminal shunt regulator placed between VBUS and GND to divert excess energy above 47 V. Use Value: Prevents damage to downstream USB controller ICs by limiting voltage excursion to ≤49.35 V with <105 Ω dynamic impedance. |
Use Scenario: Provide stable reference voltage for fuel gauge IC analog front-end in lithium-ion battery packs. IC Role / Device Role / Timing Role: Precision Zener reference sourcing bias current to ADC input stage. Use Value: Delivers 47 V ±5% reference with <0.1 μA leakage, ensuring accurate cell voltage measurement over temperature and aging. |
| Industrial Sensor Signal Conditioning | IoT Node Power Rail Stabilization |
|
Use Scenario: Regulate excitation voltage for 4–20 mA loop-powered pressure transmitters operating from 24 V supply. IC Role / Device Role / Timing Role: Shunt regulator maintaining constant 47 V reference for op-amp gain-setting network. Use Value: Compensates for supply variation using 105 Ω ZZT and 556 °C/W RJA, enabling stable output despite ambient shifts up to +85°C. |
Use Scenario: Stabilize auxiliary 47 V bias rail feeding RF power amplifier in LPWAN base station module. IC Role / Device Role / Timing Role: Voltage clamp protecting PA enable circuitry from supply overshoot during power-up sequencing. Use Value: Absorbs 225 W transient pulses (8 × 20 µs) without degradation, preserving long-term reliability in field-deployed equipment. |
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-C47LT1G | Same 47 V nominal Zener voltage, but 300 mW rating and 60 Ω ZZT @ 5 mA - lower impedance but higher power footprint | Requires larger thermal margin due to higher PD; better suited for higher-current regulation | Select when tighter voltage regulation (<2% tolerance) and higher surge capability are needed, accepting larger layout impact |
| MMBZ5262ELT1G | 47 V nominal (48.45–53.55 V range), 2.5 mA IZT, 125 Ω ZZT - wider voltage spread and higher impedance than MMBZ5261ELT1 | Less precise regulation; acceptable where ±10% voltage tolerance suffices | Choose for cost-sensitive designs where absolute voltage accuracy is secondary to part availability and legacy BOM alignment |
Compared with BZX84-C47LT1G and MMBZ5262ELT1G, the MMBZ5261ELT1 offers the tightest voltage tolerance (±5% vs. ±10% or unspecified), lowest leakage (0.1 μA), and optimal balance of impedance (105 Ω) and power density (225 mW in SOT-23) for space-constrained, low-quiescent systems.
Availability
MMBZ5261ELT1 is available at Aetrix Electronics and suitable for USB interface protection, battery management reference design, and industrial sensor signal conditioning requiring stable component supply and full traceability.
Supply support for MMBZ5261ELT1 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 manufacturer specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The MMBZ52xxELT1G series is designed for compact, high-reliability voltage regulation in portable and high-density electronics - emphasizing low-profile packaging, high ESD immunity, and stable Zener characteristics across wide temperature ranges.
FAQ
What is the exact Zener voltage range for MMBZ5261ELT1 at 25°C?
The MMBZ5261ELT1 has a guaranteed Zener voltage range of 44.65 V (minimum) to 49.35 V (maximum) when tested at IZT = 2.7 mA and TA = 25°C, corresponding to a nominal 47 V rating with ±5% tolerance as specified in the Electrical Characteristics table on page 3 of the onsemi datasheet.
Does MMBZ5261ELT1 have a functional pin 2 connection?
No - MMBZ5261ELT1 uses Style 8 pinout per the mechanical outline documentation: Pin 1 is Anode, Pin 2 is No Connection (internally unconnected), and Pin 3 is Cathode. Pin 2 must remain unconnected on the PCB; routing to it may cause assembly defects or electrical malfunction.
What is the maximum allowable junction temperature for MMBZ5261ELT1?
The MMBZ5261ELT1 has a junction and storage temperature range of −65°C to +150°C. Its maximum operating junction temperature is +150°C; exceeding this limit risks irreversible parametric shift or catastrophic failure, especially under sustained power dissipation near its 225 mW rating.
Can MMBZ5261ELT1 replace MMBZ5262ELT1G in an existing design?
MMBZ5261ELT1 and MMBZ5262ELT1G are not direct replacements: MMBZ5261ELT1 specifies 44.65–49.35 V (47 V nominal), while MMBZ5262ELT1G specifies 48.45–53.55 V (51 V nominal). Substituting MMBZ5261ELT1 may cause under-regulation if the circuit relies on ≥48.45 V threshold behavior.
Is MMBZ5261ELT1 compliant with automotive AEC-Q101 standards?
No - only the SZ-prefix variants (e.g., SZMMBZ5261ELT1G) are AEC-Q101 qualified and PPAP capable. The MMBZ5261ELT1 is intended for commercial and industrial applications; its qualification level does not include automotive stress testing or change control requirements.
MMBZ5261ELT1 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):
- 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)
MMBZ5261ELT1 FAQ
1.How can I place an order for MMBZ5261ELT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5261ELT1 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 MMBZ5261ELT1 reliable?
The price and inventory of MMBZ5261ELT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5261ELT1 is usually 5 days.
3.What payment methods are accepted for MMBZ5261ELT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5261ELT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5261ELT1?
MMBZ5261ELT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5261ELT1 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 MMBZ5261ELT1?
For technical support, including MMBZ5261ELT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5261ELT1 requirements.
6.How does Aetrix verify that MMBZ5261ELT1 is sourced from the original manufacturer or authorized distributors?
All MMBZ5261ELT1 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 MMBZ5261ELT1 meets industry standards.
7.What is the process for return or replacement of MMBZ5261ELT1?
All MMBZ5261ELT1 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5261ELT1, 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 MMBZ5261ELT1 part is unused and in its original packaging.
Return procedure for MMBZ5261ELT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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