Diodes Incorporated ZMM5241B-7

Overview

ZMM5241B-7 from Diodes Incorporated is a 500mW surface-mount Zener diode with a nominal zener voltage of 11 V (10.45–11.55 V range at 20 mA), 22 Ω maximum zener impedance at test current, and +0.076 %/°C temperature coefficient. It uses a MiniMELF (DO-213AA) hermetic glass package and serves as a precision voltage reference or overvoltage clamp in low-power analog power rails.

For engineers reviewing the ZMM5241B-7 datasheet, ZMM5241B-7 pinout, ZMM5241B-7 application, or ZMM5241B-7 equivalent, key selection criteria include its 11 V regulation tolerance, thermal resistance of 300 °C/W, cathode-band polarity marking, and suitability for space-constrained PCBs requiring stable low-current biasing.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain a stable reference voltage across its terminals under controlled current conditions. Its design targets low-noise, low-drift DC biasing where tight voltage tolerance and predictable temperature drift (+0.076 %/°C) are required.

The device exhibits 600 Ω maximum zener impedance at knee current (0.25 mA) and 22 Ω typical dynamic impedance at rated test current (20 mA), enabling effective regulation in feedback networks and voltage-sense circuits with minimal load-induced deviation.

Key Specifications

Pinout & Package

Package: MiniMELF (DO-213AA), hermetic glass, cylindrical surface-mount case with cathode band marking. Dimensions: A = 3.30–3.70 mm (length), B = 1.30–1.60 mm (diameter), C = 0.28–0.50 mm (lead diameter).

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX55C11-TR and MMSZ5241ET1G, ZMM5241B-7 offers superior thermal resistance (300 °C/W) and tighter production consistency in MiniMELF form factor, making it optimal for high-density, thermally isolated designs requiring long-term voltage stability.

Availability

ZMM5241B-7 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, USB-C power delivery reference, medical pulse oximeter LED bias, and automotive cabin control panel applications requiring stable component supply and traceable sourcing.

Supply support for ZMM5241B-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 centers across Asia and manufacturing in China, Taiwan, and the US.

ZMM52xxB is part of Diodes' MiniMELF Zener diode product line, engineered for high-reliability voltage reference and protection in space-constrained, thermally demanding applications across industrial and medical end equipment.

FAQ

What is the maximum continuous reverse current the ZMM5241B-7 can handle before degradation?

The ZMM5241B-7 is rated for 500 mW total power dissipation at 25 °C ambient. At its nominal 11 V zener voltage, this corresponds to a maximum continuous reverse current of approximately 45.5 mA (P = V × I). However, derating per Figure 1 reduces usable current to ~30 mA at 70 °C ambient to avoid exceeding junction temperature limits.

Does the ZMM5241B-7 have a specified junction capacitance value?

No specific junction capacitance is listed for ZMM5241B-7 in the datasheet. However, Figure 2 shows typical junction capacitance versus zener voltage for the ZMM52xxB family: at 11 V, C_j is approximately 25 pF (interpolated from the curve at V_R = 2.0 V, T_j = 25 °C). This value applies only under reverse-biased, small-signal conditions.

Can ZMM5241B-7 be used in series to achieve higher reference voltages?

Yes, multiple ZMM5241B-7 devices may be connected in series to increase total zener voltage, but current matching becomes critical. Uneven current distribution due to parameter spread (e.g., ±5% V_Z) can cause individual devices to operate outside their optimal regulation zone. For >11 V references, a single higher-voltage Zener (e.g., ZMM5242B) is preferred for stability and thermal uniformity.

Is the MiniMELF package of ZMM5241B-7 compatible with standard reflow soldering profiles?

Yes, the MiniMELF package is qualified for lead-free reflow soldering per JEDEC J-STD-020. Peak temperatures up to 260 °C for ≤10 seconds are permitted. Care must be taken to avoid thermal shock during preheat; recommended ramp rate is ≤3 °C/s. The glass body is not susceptible to popcorning, but mechanical stress from board flexure post-reflow must be minimized.