Diodes Incorporated ZMM5247B-7

Overview

ZMM5247B-7 from Diodes Incorporated is a 500mW surface-mount Zener diode with a nominal zener voltage of 17V (16.15–17.85V range), 7.4mA test current, and 19Ω maximum zener impedance at I_ZT; it features a MiniMELF glass package, -65°C to +175°C operating temperature range, and is used for precision voltage regulation in low-power analog reference and overvoltage protection circuits.

For engineers reviewing the ZMM5247B-7 datasheet, ZMM5247B-7 pinout, ZMM5247B-7 application, or ZMM5247B-7 equivalent, key selection considerations include its 17V zener tolerance, 19Ω dynamic impedance, thermal resistance of 300°C/W, cathode-band polarity marking, and MiniMELF mechanical compatibility with DO-213AA footprint requirements.

Technical Context

This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown at precisely controlled V_Z when reverse-biased above its threshold. Its zener voltage exhibits a +0.084%/°C temperature coefficient, enabling predictable drift compensation in stable reference designs.

Rated for 500mW continuous power dissipation at 25°C ambient (derated linearly above 25°C), it delivers 0.1µA maximum reverse leakage at 13V (VR), with junction capacitance ~15pF at 2V reverse bias - suitable for DC and low-frequency regulation, not RF or high-speed switching.

Key Specifications

Pinout & Package

Two-terminal device in MiniMELF (DO-213AA) hermetic glass package; polarity indicated by cathode band; terminals are solderable per MIL-STD-202, Method 208.

Key Features

Applications

Availability

ZMM5247B-7 is available at Aetrix Electronics and suitable for industrial power supervision, analog sensor interface design, and embedded voltage reference applications requiring stable component supply and long-lifecycle support.

Supply support for ZMM5247B-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, serving industrial, computing, consumer, and communications markets.

ZMM52xxB is part of Diodes' legacy Zener diode product line designed specifically for high-reliability, low-power voltage regulation and protection in space-constrained surface-mount applications.

FAQ

What is the recommended current-limiting resistor value for ZMM5247B-7 in a 24V supply shunt regulator?

For reliable 17V regulation at 7.4mA test current, use R = (24V − 17V) / 7.4mA ≈ 946Ω. A standard 1kΩ 1% resistor delivers 7mA, keeping power dissipation at 119mW - well within the 500mW rating and ensuring stable operation without thermal runaway.

Does ZMM5247B-7 have a specified junction capacitance value?

Yes - junction capacitance is approximately 15pF at 2V reverse bias, as shown in Figure 2 of the DS30024 datasheet. This value decreases with increasing reverse voltage and is relevant for low-frequency filtering but unsuitable for RF bypass applications due to limited bandwidth.

Can ZMM5247B-7 replace ZMM5246B or ZMM5248B in existing designs?

ZMM5247B-7 has a nominal 17V rating versus 16V and 18V for ZMM5246B and ZMM5248B respectively. Substitution is feasible only if system tolerance allows ±1V shift; otherwise, verify that downstream circuitry (e.g., comparator thresholds or regulator headroom) remains functional at the new V_Z.

Is the MiniMELF package of ZMM5247B-7 compatible with automated pick-and-place equipment?

Yes - the MiniMELF (DO-213AA) package is supported by standard SMT placement machines using vacuum nozzles rated for 1.3–1.6mm diameter cylindrical components. Diodes Incorporated confirms compliance with JEDEC J-STD-020 moisture sensitivity level MSL-1, enabling uncomplicated reflow assembly.