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onsemi MMBZ5231BLT3
- Part No.:
- MMBZ5231BLT3
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5231BLT3.pdf
- Description:
- DIODE ZENER 5.1V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:7,547
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Product details
Overview
MMBZ5231BLT3 from onsemi is a 5.1 V ±5% Zener diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board and designed for precision voltage regulation in space-constrained applications such as portable power rails and low-voltage reference circuits.
For engineers reviewing the MMBZ5231BLT3 datasheet, pinout, applications, or equivalent options, key selection criteria include nominal Zener voltage (5.1 V), dynamic impedance (17 Ω @ 20 mA), leakage current (5 µA @ 2 V), thermal resistance (556 °C/W), and AEC-Q101 qualification status for automotive-grade reliability.
Technical Context
This device operates as a two-terminal voltage reference with cathode-anode polarity, utilizing silicon PN-junction Zener breakdown at reverse bias. It delivers stable regulation across −65°C to +150°C junction temperature range and exhibits a typical temperature coefficient of +2 mV/°C near 5.1 V.
The SOT-23 package supports automated placement and reflow soldering up to 260°C for 10 seconds. Its NC (no connection) pin 2 isolates internal die structure from external routing, enabling compact layout without parasitic coupling concerns in high-density PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 5.1 V nominal, 4.84–5.36 V min/max at 20 mA - defines regulated output voltage tolerance under standard test conditions. |
| Power Dissipation (PD) | 225 mW on FR-5 board at 25°C - sets maximum continuous power handling before thermal derating applies. |
| Zener Impedance (ZZT) | 17 Ω max at IZT = 20 mA - determines output voltage stability under load current variation. |
| Leakage Current (IR) | 5 µA max at VR = 2 V - ensures minimal quiescent current draw in standby or low-power modes. |
| Thermal Resistance (RJA) | 556 °C/W on FR-5 board - quantifies junction-to-ambient heat transfer efficiency for thermal design margining. |
| ESD Rating | Class 3 (>16 kV HBM) - enables robust handling in manual assembly and field-repair environments without special ESD controls. |
| Operating Temperature | −65°C to +150°C - supports deployment in extended industrial and automotive under-hood applications. |
Pinout & Package
SOT-23 (TO-236) surface-mount package, 2.90 × 1.30 × 1.00 mm, void-free thermosetting plastic case with corrosion-resistant finish and UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Forward-biased terminal; connects to lower-potential node in Zener regulation configuration. |
| 2 | No Connection | Internally unconnected; must remain floating-no PCB trace or pad required. |
| 3 | Cathode | Reverse-biased terminal; connects to higher-potential node and serves as regulated output reference point. |
Key Features
| Feature | Design Value |
|---|---|
| Pb-Free, Halogen-Free/BFR-Free | RoHS-compliant construction eliminates hazardous substances per EU Directive 2011/65/EU and supports green manufacturing. |
| AEC-Q101 Qualified | Validated for automotive electronics use with stress testing including HTOL, TCT, and ESD per AEC specification. |
| 225 mW Power Rating | Enables direct replacement of larger-package Zeners in battery-powered devices without thermal redesign. |
| Small SOT-23 Footprint | Reduces PCB area by >60% vs. DO-35 or SOD-123 packages, critical for ultra-thin mobile and wearable designs. |
| High ESD Robustness | Withstands >16 kV human-body-model discharge, reducing need for external TVS protection in consumer interfaces. |
Applications
| USB Power Rail Protection | Automotive Cabin Controller Reference |
|---|---|
Use Scenario: Clamping transient overvoltage on 5 V USB VBUS lines in portable accessories. IC Role / Device Role / Timing Role: Zener voltage clamp limiting input to safe levels for downstream LDOs and USB PHYs. Use Value: Prevents damage from ESD events and load-dump spikes while maintaining <5 µA leakage during normal operation. |
Use Scenario: Providing stable 5.1 V reference for microcontroller ADC and sensor biasing in HVAC control modules. IC Role / Device Role / Timing Role: Precision shunt reference ensuring consistent analog measurement accuracy across −40°C to +125°C ambient. Use Value: Delivers ±5% voltage tolerance and +2 mV/°C TC, enabling <1 LSB error in 10-bit ADC conversions. |
| Smartphone Battery Management | Industrial IoT Sensor Node |
Use Scenario: Regulating auxiliary supply for fuel-gauge ICs and charge-status LEDs in Li-ion battery packs. IC Role / Device Role / Timing Role: Low-power shunt regulator maintaining constant voltage despite varying cell voltage and load current. Use Value: 225 mW rating and 17 Ω ZZT ensure stable 5.1 V output across 0.1–20 mA load range with <100 mV droop. |
Use Scenario: Generating local reference for analog front-end amplifiers in wireless temperature/humidity sensors. IC Role / Device Role / Timing Role: Compact voltage reference enabling single-layer PCB layout in constrained 12 mm × 12 mm sensor modules. Use Value: SOT-23 footprint and 556 °C/W RJA allow thermal management without heatsinks in sealed enclosures. |
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-C5V1 | Same 5.1 V nominal, but 350 mW rating on FR-4 and 400 Ω ZZK @ 1 mA - higher power but less stable at low currents. | Preferred in general-purpose industrial boards where board space is not constrained and higher surge tolerance is needed. | Select when needing higher pulse power handling and legacy compatibility; avoid if ESD >16 kV or AEC-Q101 compliance is required. |
| MMBZ5231BS | Identical electrical specs but in SOD-323 package - 1.7 × 1.25 × 0.95 mm, slightly smaller footprint but no NC pin. | Better suited for ultra-high-density RF modules where every 0.1 mm² matters and NC pin routing adds complexity. | Choose for maximum miniaturization where pin 2 isolation is unnecessary; verify thermal performance on target substrate. |
Compared with BZX84-C5V1 and MMBZ5231BS, the MMBZ5231BLT3 uniquely combines AEC-Q101 qualification, Class 3 ESD rating, and NC pin architecture-making it optimal for automotive infotainment power domains and medical handhelds requiring both reliability and layout flexibility.
Availability
MMBZ5231BLT3 is available at Aetrix Electronics and suitable for USB power protection, automotive cabin controllers, smartphone battery management, and industrial IoT sensor nodes requiring stable component supply across long production lifecycles.
Supply support for MMBZ5231BLT3 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 power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, medical, and IoT applications.
The MMBZ52xxBLT3G series targets space- and power-sensitive voltage regulation needs in portable and automotive electronics, emphasizing small-form-factor reliability, AEC-Q101 compliance, and high-volume manufacturability.
FAQ
What is the Zener voltage tolerance of MMBZ5231BLT3?
The MMBZ5231BLT3 has a nominal Zener voltage of 5.1 V with a tolerance of ±5%, meaning its actual regulation voltage falls between 4.84 V and 5.36 V when tested at 20 mA reverse current and 25°C ambient temperature. This tolerance is guaranteed per onsemi's Electrical Characteristics table and applies across the full operating temperature range.
Is MMBZ5231BLT3 suitable for automotive applications?
Yes, MMBZ5231BLT3 is AEC-Q101 qualified and PPAP capable, making it suitable for automotive applications including body control modules, infotainment systems, and cabin sensors. Its −65°C to +150°C junction temperature range, Class 3 ESD rating, and Pb-free RoHS compliance meet stringent automotive reliability requirements.
What does the "LT3" suffix indicate in MMBZ5231BLT3?
The "LT3" suffix denotes a 10,000-piece tape-and-reel packaging format in the SOT-23 package. It distinguishes this variant from the "LT1" version (3,000-piece reel) and confirms Pb-free construction ("G" implied per onsemi's marking convention). The electrical and thermal specifications remain identical across LT1 and LT3 variants.
How does the NC pin (pin 2) affect PCB layout for MMBZ5231BLT3?
Pin 2 of MMBZ5231BLT3 is internally not connected and must be left unconnected on the PCB-no trace, pad, or via should be routed to it. This simplifies layout by eliminating potential short-circuit risks and reduces parasitic capacitance, which is especially beneficial in high-frequency or low-noise analog reference paths.
What is the maximum allowable junction temperature for MMBZ5231BLT3?
The maximum junction temperature for MMBZ5231BLT3 is +150°C, as specified in the Absolute Maximum Ratings table. Operation beyond this limit may cause irreversible degradation. At 25°C ambient, the device reaches this limit at ~225 mW dissipation; derating is required above 25°C at 1.8 mW/°C on FR-5 board.
MMBZ5231BLT3 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):
- 5.1 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 17 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 2 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)
MMBZ5231BLT3 FAQ
1.How can I place an order for MMBZ5231BLT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5231BLT3 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 MMBZ5231BLT3 reliable?
The price and inventory of MMBZ5231BLT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5231BLT3 is usually 5 days.
3.What payment methods are accepted for MMBZ5231BLT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5231BLT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5231BLT3?
MMBZ5231BLT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5231BLT3 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 MMBZ5231BLT3?
For technical support, including MMBZ5231BLT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5231BLT3 requirements.
6.How does Aetrix verify that MMBZ5231BLT3 is sourced from the original manufacturer or authorized distributors?
All MMBZ5231BLT3 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 MMBZ5231BLT3 meets industry standards.
7.What is the process for return or replacement of MMBZ5231BLT3?
All MMBZ5231BLT3 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5231BLT3, 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 MMBZ5231BLT3 part is unused and in its original packaging.
Return procedure for MMBZ5231BLT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ5231BLT3 Tags
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