Diodes Incorporated ZMM5244B-7

Overview

ZMM5244B-7 from Diodes Incorporated is a 500mW surface-mount Zener diode with nominal zener voltage of 14 V (13.3–14.7 V range at 9.0 mA test current), 600 Ω maximum zener impedance at 15 mA, and +0.082 %/°C temperature coefficient. It uses a MiniMELF glass package for precision voltage reference in low-power analog circuits.

For engineers reviewing the ZMM5244B-7 datasheet, ZMM5244B-7 pinout, ZMM5244B-7 application, or ZMM5244B-7 equivalent, key selection criteria include zener voltage tolerance, dynamic impedance at operating current, thermal resistance (300 °C/W), reverse leakage (≤0.1 µA at 10 V), and MiniMELF mechanical compatibility in space-constrained PCB layouts.

Technical Context

This device operates as a two-terminal voltage reference, regulating voltage by maintaining a stable reverse-biased breakdown across its PN junction. Its zener voltage is specified at I_ZT = 9.0 mA with ±0.7 V tolerance and exhibits a positive temperature coefficient (+0.082 %/°C), indicating increasing V_Z with rising junction temperature.

The MiniMELF hermetic glass package enables reliable operation from −65 °C to +175 °C ambient, with thermal resistance of 300 °C/W enabling predictable power derating above 25 °C. Forward voltage is 1.5 V at 200 mA, confirming standard silicon diode behavior in forward conduction.

Key Specifications

Pinout & Package

MiniMELF (JEDEC DO-213AA) hermetic glass package: cylindrical body (3.3–3.7 mm length × 1.3–1.6 mm diameter), cathode band marking, solderable terminals per MIL-STD-202 Method 208.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener reference applications.

Compared with BZX55C14-TR and MMSZ4687T1G, ZMM5244B-7 offers superior thermal performance (300 °C/W vs. ~500 °C/W), MiniMELF space efficiency, and consistent 500 mW rating-making it optimal for high-reliability, surface-mount voltage reference designs requiring stable 14 V regulation.

Availability

ZMM5244B-7 is available at Aetrix Electronics and suitable for overvoltage protection, sensor biasing, analog input guarding, and programmable threshold detection requiring stable component supply and tight zener voltage control.

Supply support for ZMM5244B-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.

ZMM52xxB belongs to Diodes' MiniMELF Zener diode product line, engineered for high-stability, low-leakage voltage reference applications in automotive, industrial, and medical electronics where hermetic packaging and precise TC control are critical.

FAQ

What is the maximum continuous power dissipation for ZMM5244B-7 at 70°C ambient?

At 70°C ambient, ZMM5244B-7's power dissipation must be derated linearly from 500 mW at 25°C using its 300 °C/W thermal resistance. The allowable power is 500 mW × (1 − (70 − 25)/300) = 325 mW. Exceeding this risks junction temperature exceeding 175°C and permanent degradation.

Can ZMM5244B-7 be used in forward conduction mode?

Yes - ZMM5244B-7 exhibits standard silicon diode forward characteristics: 1.5 V at 200 mA. It can serve as a polarity protection diode or low-voltage clamp in forward bias, though its primary design intent is reverse-bias zener regulation at 14 V.

How does the +0.082 %/°C temperature coefficient affect circuit accuracy?

A +0.082 %/°C TC means V_Z increases by 11.5 mV per °C rise from 25°C. Over a 100°C range (−25°C to +75°C), total drift is ±0.82%, or ±115 mV around 14 V - critical for precision references but manageable with calibration or compensation in industrial systems.

Is the MiniMELF package compatible with standard reflow profiles?

Yes - ZMM5244B-7's MiniMELF (DO-213AA) package is qualified for lead-free reflow per J-STD-020. Its glass body withstands peak temperatures up to 260°C for ≤60 seconds. Recommended profile includes ramp rate ≤3°C/s, soak at 150–200°C for 60–120 s, and peak at 235–245°C for 40–60 s.