Diodes Incorporated ZMM5264B-7

Overview

ZMM5264B-7 from Diodes Incorporated is a 60 V, 500 mW surface-mount Zener diode in MiniMELF (DO-213AA) glass package, rated for 2.1 mA test current, 1400 Ω maximum dynamic impedance at 1 mA, and +0.097 %/°C temperature coefficient. It provides precision voltage regulation in low-power analog reference and overvoltage protection circuits operating from -65 °C to +175 °C.

For engineers reviewing the ZMM5264B-7 datasheet, ZMM5264B-7 pinout, ZMM5264B-7 application, or ZMM5264B-7 equivalent, key selection factors include its 60 V nominal Zener voltage with ±5% tolerance, 170 Ω max Zener impedance at 2.1 mA, thermal resistance of 300 °C/W, cathode-band polarity marking, and suitability for space-constrained industrial sensor biasing and power supply feedback networks.

Technical Context

This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown when biased above its specified Zener voltage. Its hemispheric glass MiniMELF package ensures hermetic sealing and stable long-term voltage performance under thermal cycling.

The ZMM5264B-7 exhibits a positive temperature coefficient (+0.097 %/°C), indicating increasing Zener voltage with rising junction temperature - critical for high-temperature reference stability analysis. Its 1400 Ω dynamic impedance at 1 mA and 170 Ω at 2.1 mA define regulation fidelity under varying load conditions.

Key Specifications

Pinout & Package

MiniMELF (DO-213AA) glass package: cylindrical hermetic glass body, 3.3–3.7 mm length (A), 1.3–1.6 mm diameter (B), 0.28–0.50 mm lead diameter (C); cathode identified by single black band.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX55C62-TR and MMSZ5264ET1G, the ZMM5264B-7 offers superior long-term stability via hermetic glass packaging and identical Z_ZT performance to the MMSZ5264ET1G while enabling MiniMELF placement density unattainable with DO-35.

Availability

ZMM5264B-7 is available at Aetrix Electronics and suitable for industrial sensor biasing, power supply feedback reference, overvoltage clamp protection, and high-temperature analog reference applications requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for ZMM5264B-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, manufacturing, and sales operations across Asia, Europe, and North America.

The ZMM52xxB series belongs to Diodes' precision Zener diode product line, engineered specifically for high-reliability voltage reference and regulation in automotive, industrial, and computing applications demanding hermetic packaging and wide-temperature operation.

FAQ

What is the maximum continuous reverse voltage the ZMM5264B-7 can withstand without breakdown?

The ZMM5264B-7 begins controlled reverse breakdown at its nominal Zener voltage of 60 V, with guaranteed operation between 57.0 V and 63.0 V at 2.1 mA. It is not rated for continuous reverse blocking above 63.0 V - sustained voltage beyond this range risks irreversible avalanche damage or parametric shift.

Can the ZMM5264B-7 be used in place of a 56 V Zener diode like ZMM5263B?

No - the ZMM5264B-7 is specified for 60 V regulation and is not a functional substitute for 56 V devices. Substituting alters reference voltage by ~7%, directly impacting feedback loop setpoints and potentially causing overvoltage or undervoltage faults in regulated supplies or sensor interfaces.

Does the ZMM5264B-7 require heatsinking in standard PCB layouts?

At full 500 mW dissipation, the 300 °C/W thermal resistance requires significant copper area (≥100 mm² exposed pad with thermal vias) to maintain junction temperature within limits. For typical 10–50 mW operation in bias/reference roles, standard 1 oz. FR-4 traces suffice without added heatsinking.

How does the +0.097 %/°C temperature coefficient affect accuracy in a 100 °C ambient environment?

From 25 °C to 125 °C ambient (100 °C rise), the Zener voltage increases by approximately 0.097 %/°C × 100 °C = 9.7%, or ~5.8 V - resulting in a final V_Z ≈ 65.8 V. This must be accounted for in system-level tolerance budgets, especially in closed-loop references where drift impacts overall measurement fidelity.