Diodes Incorporated MMBZ5230BT-7-F

Overview

MMBZ5230BT-7-F from Diodes Incorporated is a 4.7 V, 150 mW surface-mount Zener diode in SOT-523 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 bias. It provides precision voltage regulation in low-power signal conditioning and voltage reference circuits.

For engineers reviewing the MMBZ5230BT-7-F datasheet, MMBZ5230BT-7-F pinout, MMBZ5230BT-7-F application, or MMBZ5230BT-7-F equivalent, key selection criteria include nominal Zener voltage tolerance (±5%), thermal resistance (833 °C/W), ultra-small footprint suitability for high-density PCBs, and RoHS-compliant matte tin plating over Alloy 42 leadframe.

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 breakdown characteristics and low leakage across -65°C to +150°C operating range.

Designed for general-purpose voltage regulation and transient suppression in space-constrained applications, it delivers 4.7 V nominal regulation with ±5% tolerance and exhibits 19 Ω impedance at 20 mA, enabling predictable clamping behavior in feedback networks and protection circuits.

Key Specifications

Pinout & Package

Package: SOT-523 - ultra-small surface-mount plastic case (1.60 × 0.80 × 0.50 mm), UL 94V-0 rated, moisture sensitivity level 1.

Key Features

Applications

Availability

MMBZ5230BT-7-F is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, USB port overvoltage protection, and low-power IoT node voltage monitoring requiring stable component supply and full traceability.

Supply support for MMBZ5230BT-7-F 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 analog ICs, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.

The MMBZ52xxBT series belongs to Diodes' general-purpose Zener diode product line, engineered specifically for space-constrained, low-power voltage regulation and protection in consumer, industrial, and computing applications.

FAQ

What is the maximum reverse voltage this Zener can withstand before breakdown?

The MMBZ5230BT-7-F has a nominal Zener voltage of 4.7 V with a guaranteed range of 4.47 V to 4.94 V at 20 mA test current. Breakdown occurs within this range under specified test conditions; operation above 4.94 V risks exceeding power rating unless current is strictly limited by external series resistance.

Is this part suitable for use in automotive applications?

Yes - the MMBZ5230BT-7-F is qualified for operation from -65°C to +150°C and meets RoHS and lead-free requirements. While not AEC-Q200 qualified, its thermal and electrical specs support non-safety-critical automotive cabin control and infotainment subsystems where full qualification is not mandated.

How does the SOT-523 package affect thermal performance?

The SOT-523 package delivers 833 °C/W junction-to-ambient thermal resistance when mounted on FR-4 with recommended pad layout. This requires strict adherence to Diodes' AP02001 layout guidelines to avoid derating; exceeding 150 mW dissipation without thermal relief will cause rapid junction temperature rise.

Can this Zener replace a 1N4732A in existing designs?

No - the 1N4732A is a 4.7 V, 1 W through-hole Zener in DO-41 package. The MMBZ5230BT-7-F offers identical nominal voltage but only 150 mW power rating and SOT-523 footprint. Direct replacement requires verifying that peak power dissipation remains below 150 mW and that PCB layout accommodates the smaller package.