Diodes Incorporated ZMM5267B-7

Overview

ZMM5267B-7 from Diodes Incorporated is a 75 V, 1.7 mA nominal zener current, 500 mW surface-mount zener diode in MiniMELF (DO-213AA) package, with 1700 Ω maximum zener impedance at 1.7 mA and +0.098 %/°C temperature coefficient; used for precision voltage reference and overvoltage protection in DC power rails of industrial sensor interfaces.

For engineers reviewing the ZMM5267B-7 datasheet, ZMM5267B-7 pinout, ZMM5267B-7 application, or ZMM5267B-7 equivalent, key selection criteria include its 71.25–78.75 V zener voltage range at 1.7 mA, low 0.1 µA reverse leakage at rated voltage, thermal resistance of 300 °C/W, and MiniMELF mechanical compatibility with automated SMT placement.

Technical Context

This device operates as a two-terminal voltage-regulating element relying on controlled reverse-biased avalanche breakdown. Its zener voltage is specified at 1.7 mA test current with ±3.75 V tolerance (71.25–78.75 V), and exhibits a positive temperature coefficient (+0.098 %/°C), indicating increasing VZ with rising junction temperature.

Designed for stable DC reference generation, it delivers 500 mW power dissipation under ambient conditions with electrodes held at TA, and supports operation from –65 °C to +175 °C. Junction capacitance is ~2 pF at 2 V reverse bias, per typical characterization curves.

Key Specifications

Pinout & Package

Two-terminal device: anode and cathode. Cathode identified by single black band on glass body. No internal leads or multi-pin configuration.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX55C75 and MMSZ5267B, ZMM5267B-7 offers superior thermal performance (300 vs 350/450 °C/W), tighter VZ tolerance (±5% vs ±5% but narrower actual spread), and hermetic reliability-making it optimal for mission-critical industrial and automotive voltage references.

Availability

ZMM5267B-7 is available at Aetrix Electronics and suitable for industrial sensor conditioning, automotive ECU protection, and PLC analog input modules requiring stable component supply and long-term parametric consistency.

Supply support for ZMM5267B-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.

ZMM5221B–ZMM5267B is a family of 500 mW MiniMELF zener diodes engineered for high-reliability voltage regulation and transient suppression in harsh-environment applications including automotive, industrial controls, and telecom infrastructure.

FAQ

What is the maximum continuous reverse current the ZMM5267B-7 can sustain without degradation?

The ZMM5267B-7 is rated for 500 mW power dissipation at TA = 25 °C with electrodes held at ambient temperature. At its nominal 75 V zener voltage, this corresponds to a maximum continuous reverse current of approximately 6.7 mA (500 mW ÷ 75 V). Derating is required above 25 °C per the thermal resistance curve in Figure 1.

Can ZMM5267B-7 be used in series or parallel configurations for higher voltage or current capability?

ZMM5267B-7 is not recommended for parallel operation due to mismatched zener voltages causing current hogging. In series, total voltage equals sum of individual VZ values, but thermal coupling and tolerance stacking must be accounted for; use matched lots and derate power per device based on worst-case RJA and ambient conditions.

How does the +0.098 %/°C temperature coefficient affect accuracy in a 0–70 °C operating range?

Over a 70 °C span, the zener voltage shifts by +0.098 %/°C × 70 °C = +6.86%. For a 75 V nominal device, that equals +5.15 V drift - approximately ±2.58 V around nominal. This must be included in system-level error budgets; compensation techniques like complementary diode networks may be applied.

Is the MiniMELF package compatible with standard lead-free reflow profiles?

Yes - the hermetic glass MiniMELF (DO-213AA) package is qualified for lead-free reflow per JEDEC J-STD-020. Peak temperature must not exceed 260 °C for ≤10 seconds, with ramp rates compliant with Class 3 profiles. The 0.034 g mass and thermal mass support uniform heating without cracking.