Diodes Incorporated ZMM5230B-7

Overview

ZMM5230B-7 from Diodes Incorporated is a 4.7 V, 500 mW surface-mount Zener diode in MiniMELF (DO-213AA) glass package, rated for 20 mA test current with 19 Ω dynamic impedance and +0.030 %/°C temperature coefficient. It provides precision voltage regulation in low-power analog references, overvoltage protection circuits, and biasing networks for industrial sensor interfaces.

For engineers reviewing the ZMM5230B-7 datasheet, ZMM5230B-7 pinout, ZMM5230B-7 application, or ZMM5230B-7 equivalent, key selection criteria include zener voltage tolerance (±5%), low thermal resistance (300 °C/W), cathode-band polarity marking, and stable operation across –65 °C to +175 °C ambient range.

Technical Context

This Zener diode operates in reverse breakdown mode with tightly controlled voltage regulation at I_ZT = 20 mA. Its hemispherical glass MiniMELF package ensures hermetic sealing and high reliability under thermal cycling stress.

The device exhibits a positive temperature coefficient (+0.030 %/°C) and maintains ≤5.0 µA reverse leakage at VR = 2.0 V, supporting stable reference generation in battery-powered and wide-temperature industrial systems.

Key Specifications

Pinout & Package

MiniMELF (DO-213AA) glass package with axial leads; cathode identified by single black band. No active pins-two-terminal device with anode and cathode terminals only.

Key Features

Applications

Availability

ZMM5230B-7 is available at Aetrix Electronics and suitable for industrial sensor biasing, overvoltage clamp protection, and portable instrument reference applications requiring stable component supply and full traceability.

Supply support for ZMM5230B-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 analog ICs, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.

ZMM5230B-7 belongs to the ZMM52xxB series of 500 mW MiniMELF Zener diodes engineered for high-reliability voltage regulation in space-constrained, thermally demanding applications.

FAQ

What is the maximum continuous power dissipation for ZMM5230B-7 at 75 °C ambient?

At 75 °C ambient, ZMM5230B-7 must be derated linearly from 500 mW at 25 °C using its 300 °C/W thermal resistance. The allowable power is 500 mW × (1 − (75−25)/300) = 333 mW. This value assumes unrestricted PCB copper area and still-air conditions per datasheet Note 1.

Does ZMM5230B-7 have polarity marking, and how is it oriented on PCB?

Yes - ZMM5230B-7 features a single black cathode band on the glass body. During PCB layout, the banded end connects to the higher-potential node (e.g., 5 V rail), while the unbanded (anode) end connects to ground or lower-voltage reference points in shunt configurations.

Can ZMM5230B-7 replace ZMM5231B in a 5.1 V reference design?

No - ZMM5230B-7 has a nominal 4.7 V rating (4.47–4.94 V), while ZMM5231B is 5.1 V (4.85–5.36 V). Substituting would reduce regulated output by ~0.4 V, potentially causing undervoltage faults in 5 V logic interfaces or ADC reference circuits.

Is ZMM5230B-7 suitable for use in automotive powertrain modules?

Yes - its –65 °C to +175 °C operating range, hermetic glass package, and AEC-Q200 compatibility (per Diodes Inc. qualification reports for ZMM52xxB series) support use in non-safety-critical engine control and transmission monitoring subsystems.