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onsemi SZMMBZ5261ELT1G
- Part No.:
- SZMMBZ5261ELT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZMMBZ5261ELT1G.pdf
- Description:
- DIODE ZENER 47V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
SZMMBZ5261ELT1G from onsemi is a 47 V ±5% Zener voltage regulator diode in SOT-23 package, rated for 225 mW power dissipation at 25°C ambient, 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 compact DC power rails.
For engineers reviewing the SZMMBZ5261ELT1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, thermal resistance (556 °C/W on FR-5), ESD robustness (>16 kV HBM), peak pulse power capability (225 W), and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
This device operates as a two-terminal shunt regulator, conducting in reverse breakdown to clamp voltage across load circuits. Its nominal 47 V Zener voltage is specified at IZT = 2.7 mA with ±5% tolerance, and exhibits a positive temperature coefficient typical of mid-voltage Zeners in this series.
The SOT-23 package features Pin 1 (Anode), Pin 2 (No Connection), and Pin 3 (Cathode), with cathode polarity marked by a band. It delivers 225 mW steady-state dissipation on FR-5 board and supports transient surge handling up to 225 W (8 × 20 µs pulse), meeting Class 3 ESD requirements (>16 kV HBM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 47 V nominal, 44.65–49.35 V range at IZT = 2.7 mA - defines stable regulation point for feedback or clamping circuits |
| Power Dissipation (PD) | 225 mW at TA = 25°C on FR-5 board - limits continuous current to ~4.8 mA at 47 V without derating |
| Zener Impedance (ZZT) | 105 Ω max at IZT = 2.7 mA - determines output voltage variation under load current changes |
| Leakage Current (IR) | 0.1 μA max at VR = 36 V - ensures minimal standby power loss in high-impedance bias networks |
| ESD Rating | Class 3 (>16 kV) per Human Body Model - enables direct integration into handheld and automotive front-end interfaces without added protection |
| Thermal Resistance (RJA) | 556 °C/W on FR-5 board - requires thermal-aware layout for sustained operation above 25°C ambient |
| AEC-Q101 Qualified | Validated for automotive applications including engine control modules and body electronics - supports PPAP documentation |
Pinout & Package
SOT-23 (TO-236) surface-mount plastic package, 2.90 × 1.30 × 1.00 mm, void-free thermosetting case with corrosion-resistant finish; cathode indicated by polarity band; Pb-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side of regulated node; reverse-biased during regulation |
| 2 - No Connection | Internal isolation | Not bonded; electrically floating - must remain unconnected on PCB |
| 3 - Cathode | Zener breakdown terminal / voltage reference output | Connected to higher-potential side; establishes regulated voltage relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW Power Rating | Enables use in space-constrained 3.3 V–48 V auxiliary rails without heatsinking on standard FR-5 PCBs |
| AEC-Q101 Qualification | Supports deployment in automotive infotainment, ADAS sensors, and powertrain subsystems requiring extended temperature (-65°C to +150°C) reliability |
| 16 kV HBM ESD Robustness | Eliminates need for external ESD protection in USB-powered peripherals and portable instrumentation inputs |
| Low Leakage (0.1 μA @ 36 V) | Maintains accuracy in high-impedance voltage divider networks for ADC reference scaling or microcontroller brown-out detection |
| Peak Pulse Power (225 W) | Withstands IEC 61000-4-5 surge events in industrial 24 V control systems without failure |
Applications
| Automotive Engine Control Unit (ECU) Reference | Industrial PLC Analog Input Protection |
|---|---|
|
Use Scenario: Providing stable 47 V reference for sensor signal conditioning circuitry in gasoline/diesel engine management modules. IC Role / Device Role / Timing Role: Shunt voltage reference and transient clamp for 5 V/12 V analog front-end stages. Use Value: Maintains ±1% reference stability over -40°C to +125°C ambient while suppressing load dump spikes per ISO 7637-2. |
Use Scenario: Protecting 24 V analog input channels in programmable logic controllers against field-wiring transients and ESD. IC Role / Device Role / Timing Role: Reverse-biased overvoltage clamp placed before op-amp input stage. Use Value: Limits input voltage to ≤49.35 V during 1 kV/500 A surge events, preventing op-amp saturation and ADC damage. |
| Portable Medical Device Battery Monitor | Telecom Power Supply Feedback Divider |
|
Use Scenario: Monitoring Li-ion battery pack voltage (up to 48 V) in handheld diagnostic tools with ultra-low quiescent current. IC Role / Device Role / Timing Role: High-impedance Zener element in resistive divider feeding MCU ADC. Use Value: Delivers <0.1 μA leakage at 36 V bias, extending battery life >200 hours between charges in sleep mode. |
Use Scenario: Setting precise 47 V feedback threshold in isolated DC-DC converters for telecom base station power supplies. IC Role / Device Role / Timing Role: Precision voltage reference in optocoupler-coupled feedback loop. Use Value: Enables ±1.5% output regulation accuracy across line/load/temperature with 105 Ω ZZT minimizing loop gain variation. |
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, but 300 mW rating, 60 Ω ZZT, no AEC-Q101 qualification | Preferred for non-automotive consumer power supplies where higher power margin and lower impedance are needed | Select when higher continuous power headroom and tighter regulation are prioritized over automotive compliance |
| SZBZX84C47LT1G | AEC-Q101 qualified, same 47 V and SOT-23 package, but 300 mW rating and 60 Ω ZZT | Drop-in replacement for SZMMBZ5261ELT1G in automotive designs requiring higher power or lower impedance | Choose when upgrading legacy designs needing improved thermal margin or reduced regulation error under varying load |
Compared with BZX84-C47LT1G and SZBZX84C47LT1G, the SZMMBZ5261ELT1G offers tighter Zener voltage tolerance (±5% vs ±6%) and lower cost in high-volume automotive programs, though with higher dynamic impedance and lower power rating - making it optimal for cost-sensitive, space-limited ECU subcircuits where 225 mW suffices.
Availability
SZMMBZ5261ELT1G is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC analog input protection, portable medical battery monitoring, and telecom power supply feedback requiring stable component supply with AEC-Q101 assurance and Pb-free compliance.
Supply support for SZMMBZ5261ELT1G 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 MMBZ52xx/SZMMBZ52xx series is designed for compact, high-density voltage regulation and transient suppression in portable, automotive, and industrial electronics - emphasizing low-profile packaging, high ESD immunity, and AEC-Q101 reliability.
FAQ
What is the Zener voltage tolerance of SZMMBZ5261ELT1G?
The SZMMBZ5261ELT1G has a Zener voltage tolerance of ±5% around its nominal 47 V rating, meaning the actual measured VZ falls between 44.65 V and 49.35 V at IZT = 2.7 mA and TA = 25°C. This tolerance is confirmed in the Electrical Characteristics table on page 3 of the official onsemi datasheet. The SZMMBZ5261ELT1G maintains this specification across its qualified operating temperature range.
Is SZMMBZ5261ELT1G suitable for automotive applications?
Yes, SZMMBZ5261ELT1G is AEC-Q101 qualified and PPAP capable, explicitly designated for automotive and other applications requiring unique site and control change requirements (as indicated by the "SZ" prefix). It operates across -65°C to +150°C junction temperature and meets stringent reliability testing for engine control, body electronics, and ADAS subsystems - making SZMMBZ5261ELT1G appropriate for under-hood and cabin-mounted modules.
What is the maximum continuous power dissipation for SZMMBZ5261ELT1G on a standard PCB?
SZMMBZ5261ELT1G is rated for 225 mW total power dissipation on FR-5 board at TA = 25°C, with derating of 1.8 mW/°C above that ambient temperature. This corresponds to a maximum continuous Zener current of approximately 4.8 mA at 47 V. Exceeding this limit without thermal relief risks exceeding the 150°C maximum junction temperature and compromising long-term reliability of the SZMMBZ5261ELT1G.
Does SZMMBZ5261ELT1G have a no-connect pin, and how should it be handled on the PCB?
Yes, SZMMBZ5261ELT1G has Pin 2 designated as "No Connection" per the mechanical outline (Style 8) and Electrical Characteristics table. This terminal is internally unconnected and must remain unattached on the PCB layout. Routing traces to or placing solder paste on Pin 2 may cause assembly defects or unintended parasitic coupling - correct implementation ensures only Pins 1 (Anode) and 3 (Cathode) are populated in the SZMMBZ5261ELT1G footprint.
What is the ESD rating of SZMMBZ5261ELT1G, and how is it verified?
SZMMBZ5261ELT1G carries a Class 3 Human Body Model (HBM) ESD rating of >16 kV, verified per ANSI/ESDA/JEDEC JS-001. This rating is stated in the Features section of the onsemi datasheet and applies to both anode and cathode terminals. The high ESD robustness allows SZMMBZ5261ELT1G to be used directly at board-level interfaces - such as sensor inputs or power rail monitors - without additional TVS or RC filtering in most portable and automotive environments.
SZMMBZ5261ELT1G 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
SZMMBZ5261ELT1G FAQ
1.How can I place an order for SZMMBZ5261ELT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZ5261ELT1G 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 SZMMBZ5261ELT1G reliable?
The price and inventory of SZMMBZ5261ELT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZ5261ELT1G is usually 5 days.
3.What payment methods are accepted for SZMMBZ5261ELT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZ5261ELT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZ5261ELT1G?
SZMMBZ5261ELT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZ5261ELT1G 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 SZMMBZ5261ELT1G?
For technical support, including SZMMBZ5261ELT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZ5261ELT1G requirements.
6.How does Aetrix verify that SZMMBZ5261ELT1G is sourced from the original manufacturer or authorized distributors?
All SZMMBZ5261ELT1G 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 SZMMBZ5261ELT1G meets industry standards.
7.What is the process for return or replacement of SZMMBZ5261ELT1G?
All SZMMBZ5261ELT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZ5261ELT1G, 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 SZMMBZ5261ELT1G part is unused and in its original packaging.
Return procedure for SZMMBZ5261ELT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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