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onsemi MMBZ5252ELT1
- Part No.:
- MMBZ5252ELT1
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5252ELT1.pdf
- Description:
- DIODE ZENER 24V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:11,740
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Product details
Overview
MMBZ5252ELT1 from onsemi is a 24 V ±5% Zener voltage regulator diode in SOT-23 package, rated for 225 mW power dissipation at 25°C on FR-5 board, with 5.2 mA test current (IZT), 33 Ω dynamic impedance (ZZT), and 0.1 μA leakage current at 18 V reverse bias - used for precision voltage reference and overvoltage protection in portable power rails.
For engineers reviewing the MMBZ5252ELT1 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, terminal mapping, thermal derating behavior, ESD robustness (Class 3, >16 kV HBM), and real-world substitution guidance aligned with onsemi's official MMBZ52xxELT1G series documentation.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable voltage across its cathode-anode terminals under varying load and temperature conditions. Its 24 V nominal regulation point targets mid-range supply rail clamping and reference generation where tighter tolerance than standard Zeners is required.
Thermal resistance is 556 °C/W (FR-5 board) and 417 °C/W (alumina substrate), enabling predictable derating above 25°C ambient. The device exhibits a positive temperature coefficient near 24 V, consistent with typical Zener voltage drift behavior in this range per Figure 1 of the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 22.8 V (min) to 25.2 V (max) at IZT = 5.2 mA - defines usable regulation window for 24 V nominal systems |
| Power Dissipation (PD) | 225 mW at TA = 25°C on FR-5 board - sets maximum continuous DC power handling before thermal derating applies |
| Zener Impedance (ZZT) | 33 Ω at IZT = 5.2 mA - indicates voltage stability under small-signal AC load variations |
| Leakage Current (IR) | 0.1 μA max at VR = 18 V - ensures minimal standby current draw in high-impedance bias networks |
| ESD Rating | Class 3 (>16 kV) per Human Body Model - supports robust handling in automated assembly and end-user portable environments |
| Peak Power (PPk) | 225 W for 8 × 20 μs pulse - enables transient surge suppression capability without device failure |
| Junction Temp Range | −65°C to +150°C - allows operation in extended industrial and automotive under-hood applications |
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 with corrosion-resistant finish; polarity band denotes cathode; Pb-free compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential side of regulated node; forward-biased during normal conduction |
| 2 | No Connection | Internally unconnected; no PCB trace or pad required - must remain floating |
| 3 | Cathode | Connected to higher-potential side; reverse-biased during Zener operation; marked by polarity band |
Key Features
| Feature | Design Value |
|---|---|
| 225 mW rating on FR-5 board | Enables compact voltage regulation in space-constrained PCB layouts without forced cooling |
| ESD robustness >16 kV HBM | Eliminates need for external ESD protection in handheld and consumer interface circuits |
| Small SOT-23 footprint | Supports high-density routing on mobile and IoT PCBs where board area is premium |
| Automated assembly optimized package | Ensures reliable pick-and-place yield and reflow soldering compatibility per JEDEC standards |
| −65°C to +150°C operating range | Validates use in industrial control modules and automotive cabin electronics without derating penalties |
Applications
| USB Power Rail Protection | Microcontroller Reference Voltage |
|---|---|
|
Use Scenario: Clamping 5 V USB VBUS line against ESD transients and overvoltage events in portable accessories. IC Role / Device Role / Timing Role: Zener diode acting as shunt overvoltage protector, clamping peak voltage to ≤25.2 V during fault conditions. Use Value: Prevents damage to downstream USB PHY ICs by limiting transient energy via 225 W peak pulse capability and low leakage (<0.1 μA). |
Use Scenario: Providing stable 24 V reference for ADC input scaling or analog sensor excitation in battery-powered data loggers. IC Role / Device Role / Timing Role: Precision Zener voltage source delivering 24 V ±5% with 33 Ω dynamic impedance for low-noise analog front-end biasing. Use Value: Enables <1% full-scale error in 12-bit ADC measurements without active regulation, reducing BOM count and quiescent current. |
| Industrial Sensor Signal Conditioning | Automotive Body Control Module |
|
Use Scenario: Regulating auxiliary 24 V supply for 4–20 mA loop-powered sensors in factory automation panels. IC Role / Device Role / Timing Role: Shunt regulator maintaining stable bias voltage despite variable loop current and cable drop. Use Value: Compensates for up to 2 V line drop while holding output within ±5% using 225 mW dissipation margin and −65°C to +150°C operation. |
Use Scenario: Overvoltage protection for LIN bus transceiver power pins in automotive door modules exposed to load dump. IC Role / Device Role / Timing Role: Transient voltage suppressor clamping 12 V system spikes to safe levels during alternator regulation faults. Use Value: Meets AEC-Q101 qualification requirements and withstands 8 × 20 μs pulses up to 225 W without degradation. |
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-C24LT1G | Same 24 V nominal Zener voltage, but 300 mW rating and 60 Ω ZZT at 5 mA - higher power but less precise regulation | Preferred in higher-current shunt applications where 225 mW limit is exceeded; less suitable for low-leakage reference use | Select when board layout allows larger thermal mass or when 300 mW headroom is needed for intermittent overload |
| MMBZ5252BS | Same electrical specs but in SOD-123 package - 3.7 mm × 1.7 mm vs. SOT-23's 2.9 mm × 1.3 mm - larger footprint, higher thermal resistance | Used where manual rework or higher power dissipation (350 mW) is prioritized over miniaturization | Choose only if SOT-23 placement density is insufficient or if legacy SOD-123 footprint compatibility is required |
Compared with BZX84-C24LT1G and MMBZ5252BS, the MMBZ5252ELT1 offers optimal balance of miniaturization (SOT-23), tight regulation (±5%), and ESD robustness (>16 kV), making it preferred for space-constrained, high-reliability portable and automotive subsystems.
Availability
MMBZ5252ELT1 is available at Aetrix Electronics and suitable for USB power protection, microcontroller reference voltage generation, industrial sensor conditioning, and automotive body control module designs requiring stable component supply and long-term lifecycle support.
Supply support for MMBZ5252ELT1 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, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The MMBZ52xxELT1G series is designed for compact, high-reliability voltage regulation in portable electronics and automotive subsystems - emphasizing low-profile packaging, ESD resilience, and stable Zener performance across wide temperature ranges.
FAQ
What is the exact Zener voltage tolerance for MMBZ5252ELT1?
The MMBZ5252ELT1 has a guaranteed Zener voltage range of 22.8 V (minimum) to 25.2 V (maximum) at IZT = 5.2 mA and TA = 25°C, corresponding to a ±5% tolerance around the nominal 24 V rating. This tolerance is confirmed in the Electrical Characteristics table on page 3 of the official onsemi datasheet, and applies strictly under the specified test conditions.
Does MMBZ5252ELT1 have a functional pin 2 connection?
No, pin 2 of the MMBZ5252ELT1 is internally not connected (NC), as explicitly stated in the datasheet's pinout diagram (Style 8) and Electrical Characteristics footnote. It must remain unconnected on the PCB - routing or soldering to pin 2 will not affect operation but violates the mechanical design and may compromise reliability during thermal cycling.
Can MMBZ5252ELT1 be used in automotive applications?
Yes, the MMBZ5252ELT1 meets AEC-Q101 qualification requirements for stress testing and is PPAP-capable, as noted in the "Features" section of the datasheet. Its −65°C to +150°C junction temperature range and 225 W peak pulse rating make it suitable for non-safety-critical automotive subsystems such as body control modules and infotainment power rails.
What is the thermal derating slope for MMBZ5252ELT1 on FR-5 board?
The MMBZ5252ELT1 derates linearly at 1.8 mW/°C above 25°C ambient when mounted on FR-5 board, per the Maximum Ratings table. At 75°C ambient, its usable power dissipation drops to 225 mW − (50 × 1.8) = 135 mW - a critical constraint for sustained operation in enclosed enclosures or high-temperature environments.
Is MMBZ5252ELT1 RoHS-compliant and lead-free?
Yes, the "G" suffix in the full part number MMBZ5252ELT1G (as referenced in the datasheet ordering table) confirms Pb-free construction and RoHS compliance. The device uses lead-free terminations and complies with JEDEC J-STD-020 moisture sensitivity level (MSL) requirements for reflow soldering.
MMBZ5252ELT1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 24 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 33 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 18 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)
MMBZ5252ELT1 FAQ
1.How can I place an order for MMBZ5252ELT1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5252ELT1 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 MMBZ5252ELT1 reliable?
The price and inventory of MMBZ5252ELT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5252ELT1 is usually 5 days.
3.What payment methods are accepted for MMBZ5252ELT1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5252ELT1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5252ELT1?
MMBZ5252ELT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5252ELT1 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 MMBZ5252ELT1?
For technical support, including MMBZ5252ELT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5252ELT1 requirements.
6.How does Aetrix verify that MMBZ5252ELT1 is sourced from the original manufacturer or authorized distributors?
All MMBZ5252ELT1 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 MMBZ5252ELT1 meets industry standards.
7.What is the process for return or replacement of MMBZ5252ELT1?
All MMBZ5252ELT1 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5252ELT1, 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 MMBZ5252ELT1 part is unused and in its original packaging.
Return procedure for MMBZ5252ELT1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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