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Diodes Incorporated MMBZ5230B-7
- Part No.:
- MMBZ5230B-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBZ5230B-7.pdf
- Description:
- DIODE ZENER 4.7V 350MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,926
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Product details
Overview
MMBZ5230B-7 from Diodes Incorporated is a 4.7V, 350mW surface-mount Zener diode in SOT23 package, designed for precision voltage regulation and overvoltage protection in low-power analog and digital circuits. It delivers nominal Zener voltage of 4.7V (min 4.47V, max 4.94V) at 20mA test current, with 19Ω dynamic impedance and ≤5µA reverse leakage at 2.0V, commonly used in power supply feedback loops and I/O clamp protection.
For engineers reviewing the MMBZ5230B-7 datasheet, MMBZ5230B-7 pinout, MMBZ5230B-7 application, or MMBZ5230B-7 equivalent, key selection criteria include Zener voltage tolerance, dynamic impedance at 1kHz, thermal resistance (357°C/W), and JEDEC-compliant reliability for industrial and consumer PCB designs.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain stable reference voltage under varying load and temperature conditions. Its planar die construction ensures consistent voltage regulation and low leakage across -65°C to +150°C operating range.
Designed for automated SMT assembly on FR-4 boards, it achieves 350mW power dissipation with defined derating above 25°C ambient and requires no external biasing-functioning as a two-terminal shunt regulator with cathode-anode polarity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.7V nominal (4.47–4.94V range at IZT = 20mA); defines clamping threshold in protection circuits |
| Power Dissipation (PD) | 350mW on FR-4 PCB; sets maximum continuous power handling before thermal shutdown |
| Zener Impedance (ZZT) | 19Ω at 1kHz, 20mA; determines regulation stiffness and output voltage ripple suppression |
| Reverse Leakage (IR) | ≤5.0µA at VR = 2.0V; ensures minimal quiescent current in standby or high-impedance nodes |
| Thermal Resistance (RθJA) | 357°C/W; defines junction-to-ambient temperature rise per watt-critical for layout thermal pad design |
| Operating Temperature | -65°C to +150°C; supports extended-range industrial and automotive under-hood applications |
Pinout & Package
Package: SOT23 - 3-pin surface-mount plastic package with matte tin-plated Alloy 42 leadframe; moisture sensitivity level 1; UL 94V-0 rated molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward conduction terminal | Connected to lower-potential node in shunt regulation; forms cathode-anode path during reverse breakdown |
| Cathode (Pin 2) | Zener breakdown terminal | Connected to regulated voltage rail; sinks current to maintain VZ when input exceeds threshold |
| No Connection (Pin 3) | Non-functional leadframe tie-bar | Internal mechanical support only; electrically isolated and must not be soldered to PCB trace |
Key Features
| Feature | Design Value |
|---|---|
| Planar die construction | Enables tight Zener voltage tolerance and repeatable breakdown characteristics across production lots |
| 350mW FR-4 power rating | Validated thermal performance without heatsinking-supports compact, cost-sensitive board layouts |
| Lead-free & RoHS 3 compliant | Fully compliant with EU Directive 2015/863/EU; no intentionally added lead, halogen, or antimony |
| SOT23 footprint compatibility | Standardized 2.9mm × 1.3mm outline enables drop-in replacement in existing SMT tooling and reflow profiles |
Applications
| Power Supply Feedback | I/O Level Translation |
|---|---|
|
Use Scenario: Regulating output voltage in low-current linear regulators or switching converter feedback networks. IC Role / Device Role / Timing Role: Shunt reference element providing stable 4.7V reference to error amplifier inputs. Use Value: Maintains ±5% output accuracy over line/load/temperature with <19Ω dynamic impedance limiting regulation error. |
Use Scenario: Clamping 5V logic signals to 3.3V-tolerant microcontroller GPIO pins. IC Role / Device Role / Timing Role: Bidirectional ESD and overvoltage protector acting as voltage-limited clamp. Use Value: Limits transient excursions to ≤4.94V while drawing <5µA leakage-preserving signal integrity and input leakage budgets. |
| ADC Reference Stabilization | Automotive Sensor Biasing |
|
Use Scenario: Providing stable bias voltage for precision analog front-end components feeding 12-bit ADCs. IC Role / Device Role / Timing Role: Low-noise voltage reference source decoupled from noisy system rails. Use Value: Delivers 4.7V reference with <19Ω impedance-reducing code-dependent reference droop and improving ENOB. |
Use Scenario: Supplying regulated bias to Hall-effect or thermistor-based sensors in engine control modules. IC Role / Device Role / Timing Role: Temperature-stable shunt regulator maintaining sensor excitation voltage across -40°C to +125°C. Use Value: Operates reliably from -65°C to +150°C with <5µA leakage at 2V-ensuring sensor accuracy over full automotive thermal range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C4V7 | Same 4.7V nominal, but 300mW rating and higher ZZT (40Ω); SOT23 package with different marking and thermal profile | Lower power margin and reduced regulation stiffness limit use in higher-current feedback paths | Select when legacy BOM alignment or distributor stock availability outweighs 50mW/21Ω performance gap |
| MMBZ5230BS-7-F | Same electrical specs, but SOD-323 package (1.7×1.25mm); 250mW rating and 390°C/W RθJA | Smaller footprint trades off thermal performance-unsuitable for sustained >150mW operation | Choose only for ultra-dense layouts where 0.5mm² area savings justify 29% lower power capability |
Compared with BZX84-C4V7 and MMBZ5230BS-7-F, MMBZ5230B-7 offers superior thermal robustness (350mW/357°C/W) and tighter regulation (19Ω), making it optimal for industrial power management where long-term stability and margin matter more than minimal footprint.
Availability
MMBZ5230B-7 is available at Aetrix Electronics and suitable for power supply feedback networks, I/O protection circuits, and precision analog biasing requiring stable component supply and JEDEC-qualified reliability.
Supply support for MMBZ5230B-7 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and ICs, specializing in high-reliability, energy-efficient components for industrial, computing, and automotive markets.
MMBZ5230B-7 belongs to the MMBZ52xxB Zener diode series-designed specifically for surface-mount voltage regulation and transient suppression in space-constrained, high-volume consumer and industrial PCBs.
FAQ
What is the maximum continuous Zener current for MMBZ5230B-7 at 25°C ambient?
The device supports up to 74.5mA continuous Zener current at 25°C, calculated from PD = 350mW and VZ = 4.7V (IZMAX = PD/VZ). Derating begins above 25°C per Fig. 1, reaching zero at ~150°C ambient.
Is MMBZ5230B-7 qualified for automotive applications?
Standard MMBZ5230B-7 is not AEC-Q200 qualified. Diodes offers automotive-grade variants with Q-suffix (e.g., MMBZ5230BQ-7-F), manufactured in IATF 16949 facilities and PPAP-capable-available via Diodes' automotive product portal.
How does the SOT23 pin 3 function electrically?
Pin 3 is an internal tie-bar with no electrical connection. It serves only mechanical support for the leadframe during molding and assembly. It must remain unconnected on the PCB to avoid unintended shorts or thermal path disruption.
Can MMBZ5230B-7 replace a 5.1V Zener in a 3.3V logic clamp?
No-its 4.7V nominal Zener voltage exceeds the 3.3V rail's absolute maximum rating. Using it risks damaging downstream ICs. For 3.3V clamping, MMBZ5229B (4.3V) or dedicated TVS diodes like DZ23C3V3 are appropriate alternatives.
MMBZ5230B-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MMBZ5230B-7 FAQ
1.How can I place an order for MMBZ5230B-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBZ5230B-7 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-7 reliable?
The price and inventory of MMBZ5230B-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBZ5230B-7 is usually 5 days.
3.What payment methods are accepted for MMBZ5230B-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBZ5230B-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBZ5230B-7?
MMBZ5230B-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBZ5230B-7 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-7?
For technical support, including MMBZ5230B-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBZ5230B-7 requirements.
6.How does Aetrix verify that MMBZ5230B-7 is sourced from the original manufacturer or authorized distributors?
All MMBZ5230B-7 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-7 meets industry standards.
7.What is the process for return or replacement of MMBZ5230B-7?
All MMBZ5230B-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMBZ5230B-7, 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-7 part is unused and in its original packaging.
Return procedure for MMBZ5230B-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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