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onsemi MMBZ5230B
- Part No.:
- MMBZ5230B
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5230B.pdf
- Description:
- DIODE ZENER 4.7V 350MW SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:73,000
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Product details
Overview
MMBZ5230B from Fairchild Semiconductor is a 4.7 V ±5% Zener diode in SOT-23 package, rated for 20 mA test current, 19 Ω dynamic impedance at 20 mA, and 5.0 μA reverse leakage at 2.0 V reverse voltage. It provides precision voltage regulation in low-power biasing and reference circuits, such as power supply feedback networks and analog sensor conditioning stages.
For engineers reviewing the MMBZ5230B datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal limits, real-world use cases, and validated alternative parts - all confirmed against Fairchild's official Rev. 1.5 datasheet (November 2015).
Technical Context
The MMBZ5230B operates as a silicon planar Zener diode with sharp reverse breakdown at nominal 4.7 V, designed for stable voltage reference under DC or low-frequency conditions. Its 19 Ω Zener impedance at 20 mA ensures minimal output voltage variation across load changes in shunt regulator configurations.
Rated for 250 mW power dissipation at 25°C ambient on FR-4 PCB and junction temperature up to +150°C, it supports reliable operation in compact consumer and industrial PCB layouts where thermal management is constrained by board area and airflow.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.7 V nominal, ±5% tolerance - defines precise clamping/reference level for feedback or protection circuits |
| Test Current (IZ) | 20 mA - standard operating point for specifying VZ and dynamic impedance |
| Zener Impedance (ZZ) | 19 Ω at 20 mA - indicates low sensitivity to current variation, critical for stable reference accuracy |
| Reverse Leakage (IR) | 5.0 μA at VR = 2.0 V - confirms low standby power loss in high-impedance bias networks |
| Power Dissipation (PD) | 250 mW at TA = 25°C - sets maximum continuous DC power handling on standard FR-4 board |
| Junction Temperature (TJ) | +150°C maximum - enables operation in thermally demanding environments without derating below 25°C ambient |
| Forward Voltage (VF) | ≤0.9 V at IF = 10 mA - ensures predictable forward conduction behavior during polarity-reversal transients |
Pinout & Package
SOT-23 surface-mount plastic package with cathode-marked lead configuration; compact 2.9 mm × 1.3 mm footprint optimized for space-constrained PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Anode) | Anode connection | Connected to lower-potential node in reverse-biased Zener operation; carries forward current when forward-biased |
| 2 (Cathode) | Cathode connection | Marked terminal; connected to higher-potential node in Zener mode; serves as thermal reference for ψJL = 220°C/W |
| 3 (NC) | No connect | Internally unconnected; must remain floating - no routing or soldering required |
Key Features
| Feature | Design Value |
|---|---|
| Tight voltage tolerance | ±5% at 20 mA - reduces calibration overhead in precision reference designs |
| Low dynamic impedance | 19 Ω - maintains <±20 mV output shift over ±5 mA load current change |
| Controlled reverse leakage | 5.0 μA @ 2.0 V - avoids signal path loading in high-impedance sensor interfaces |
| Thermal robustness | 150°C max junction temperature - supports operation in sealed enclosures without active cooling |
| Standardized SOT-23 footprint | Compatible with automated pick-and-place and reflow processes - eliminates custom tooling |
Applications
| Power Supply Feedback | Overvoltage Protection |
|---|---|
Use Scenario: Regulating output voltage in low-current linear regulators and switching converter feedback loops. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 4.7 V setpoint for error amplifier input. Use Value: Enables ±1% output regulation accuracy with minimal external components due to tight VZ tolerance and low ZZ. |
Use Scenario: Clamping transient surges on 5 V logic rails or analog inputs exposed to ESD or inductive kickback. IC Role / Device Role / Timing Role: Fast-acting voltage clamp limiting rail excursions to ≤4.7 V during fault events. Use Value: Prevents damage to downstream CMOS inputs by holding voltage within safe margin below absolute maximum ratings. |
| Sensor Biasing | Reference Voltage Source |
Use Scenario: Providing stable excitation voltage for resistive sensors (e.g., RTDs, thermistors) in battery-powered instrumentation. IC Role / Device Role / Timing Role: Low-power Zener reference supplying constant current through sensor element. Use Value: Delivers <10 ppm/°C drift contribution to overall measurement error, validated across –25°C to +125°C per typical curves. |
Use Scenario: Generating fixed 4.7 V reference for ADCs, comparators, or DACs in embedded control modules. IC Role / Device Role / Timing Role: Passive voltage reference establishing accurate analog-to-digital conversion threshold. Use Value: Achieves <±0.25% full-scale error budget in 12-bit systems without trimming, leveraging ±5% VZ and low ZZ. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C4V7 | Same 4.7 V nominal, ±5% tolerance, but 350 mW PD rating and 90 Ω ZZ at 5 mA - higher power, higher impedance | Preferred in higher-current shunt regulation (>10 mA), less suitable for low-drift reference use | Select BZX84-C4V7 when board layout allows larger thermal mass or when higher surge energy absorption is needed |
| MMBZ5230BS | Identical electrical specs but SOD-123 package - 3.7 mm × 1.6 mm, 0.9 mm height vs. SOT-23's 2.9 mm × 1.3 mm | Used where mechanical clearance or board-side component stacking requires lower profile or different land pattern | Choose MMBZ5230BS only when SOT-23 footprint conflicts with adjacent tall components or thermal vias |
Compared with BZX84-C4V7 and MMBZ5230BS, the MMBZ5230B offers optimal balance of low impedance (19 Ω), compact SOT-23 size, and proven thermal performance on standard FR-4 - making it preferred for space- and stability-critical 4.7 V reference nodes.
Availability
MMBZ5230B is available at Aetrix Electronics and suitable for power supply feedback, overvoltage protection, and sensor biasing applications requiring stable component supply, consistent parametric performance, and long-term sourcing continuity.
Supply support for MMBZ5230B 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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete devices before its acquisition by ON Semiconductor in 2016. Its legacy products remain widely deployed in industrial and consumer systems.
The MMBZ5221B–MMBZ5257B series was engineered for cost-effective, high-volume voltage regulation in space-constrained PCBs - targeting consumer electronics, power adapters, and embedded control subsystems.
FAQ
What is the nominal Zener voltage and tolerance of the MMBZ5230B?
The MMBZ5230B has a nominal Zener voltage of 4.7 V with a tolerance of ±5%, measured at 20 mA test current and 25°C ambient temperature. This specification is confirmed in Fairchild's official MMBZ5221B–MMBZ5257B Rev. 1.5 datasheet, Table "Electrical Characteristics" for device mark "8E". The MMBZ5230B maintains this tolerance across its qualified operating junction temperature range.
What is the maximum power dissipation rating for the MMBZ5230B under standard PCB conditions?
The MMBZ5230B is rated for 250 mW power dissipation when mounted on a standard FR-4 PCB (76.2 mm × 114.3 mm) at 25°C ambient temperature. This value is derived from its specified RθJA of 465°C/W and is valid only for steady-state DC operation - pulsed or low-duty-cycle applications require consultation with the manufacturer per datasheet Note 2.
Does the MMBZ5230B have a defined forward voltage specification?
Yes - the MMBZ5230B has a maximum forward voltage (VF) of 0.9 V at 10 mA forward current, as stated in the "VF Forward Voltage" note on page 3 of the Fairchild datasheet. This parameter applies uniformly across the entire MMBZ5200 series and is verified under standard test conditions (TA = 25°C).
How many pins does the MMBZ5230B have, and what is the function of Pin 3?
The MMBZ5230B uses a 3-pin SOT-23 package, but only Pins 1 (Anode) and 2 (Cathode) are electrically active. Pin 3 is explicitly designated as "NC" (No Connect) in the Connection Diagram on page 1 of the datasheet - it is internally unconnected and must remain un-routed and un-soldered in PCB layout.
What is the reverse leakage current specification for the MMBZ5230B, and at what voltage is it measured?
The MMBZ5230B exhibits a maximum reverse leakage current (IR) of 5.0 μA, measured at a reverse voltage (VR) of 2.0 V and ambient temperature of 25°C. This value is listed in the "Electrical Characteristics" table under the MMBZ5230B row and reflects its performance as a low-leakage voltage reference in high-impedance circuits.
MMBZ5230B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 4.7 V
- Tolerance:
- ±5%
- Power - Max:
- 350 mW
- Impedance (Max) (Zzt):
- 19 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
MMBZ5230B FAQ
1.How can I place an order for MMBZ5230B through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5230B 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 MMBZ5230B reliable?
The price and inventory of MMBZ5230B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5230B is usually 5 days.
3.What payment methods are accepted for MMBZ5230B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5230B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5230B?
MMBZ5230B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5230B 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 MMBZ5230B?
For technical support, including MMBZ5230B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5230B requirements.
6.How does Aetrix verify that MMBZ5230B is sourced from the original manufacturer or authorized distributors?
All MMBZ5230B 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 MMBZ5230B meets industry standards.
7.What is the process for return or replacement of MMBZ5230B?
All MMBZ5230B units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5230B, 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 MMBZ5230B part is unused and in its original packaging.
Return procedure for MMBZ5230B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBZ5230B Tags
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BZT52C5V6T-7
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MMSZ5231B-7-F
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BZX84C3V3LT1G
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MMSZ5245BS-7-F
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MMSZ4682T1G
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BZT52C15S-7-F
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MM5Z5V1ST1G
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SMAJ4744A-TP
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