Diodes Incorporated MMBZ5248BS-7-F

Overview

MMBZ5248BS-7-F from Diodes Incorporated is a dual isolated 18 V Zener diode pair in SOT-363 package, rated for 200 mW total power dissipation, 7.0 mA test current, and 21 Ω dynamic impedance at 1 kHz; used for precision voltage reference and overvoltage clamping in space-constrained analog signal conditioning circuits.

For engineers reviewing the MMBZ5248BS-7-F datasheet, MMBZ5248BS-7-F pinout, MMBZ5248BS-7-F application, or MMBZ5248BS-7-F equivalent, key selection criteria include nominal Zener voltage (18 V), max reverse leakage (0.1 µA at 14 V), thermal resistance (625 °C/W), dual-diode isolation, and RoHS-compliant SOT-363 footprint compatibility with automated placement.

Technical Context

This dual-Zener device integrates two electrically isolated 18 V Zener junctions in a single ultra-small SOT-363 package, enabling compact bidirectional voltage regulation or symmetric clamping without cross-talk. Each diode operates independently with identical electrical specs: 17.1–18.9 V breakdown range, 7.0 mA test current, and 21 Ω Zener impedance at 1 kHz.

Designed for surface-mount assembly on FR4 PCBs using recommended pad layout, it supports stable operation from –65 °C to +150 °C ambient, with thermal derating beginning above 25 °C per the 625 °C/W R_θJA rating and 200 mW maximum power dissipation at T_A = 25 °C.

Key Specifications

Pinout & Package

SOT-363 package: 6-pin, dual-isolated Zener configuration with symmetrical pin mapping. Body dimensions: 2.20 × 1.35 × 0.95 mm (L × W × H); UL 94V-0 molded plastic case; matte tin-plated Alloy 42 leadframe.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C18LT1G and PDZ18B,115, MMBZ5248BS-7-F uniquely delivers dual isolated 18 V Zeners in SOT-363, enabling compact bidirectional clamping with matched parameters-ideal for space-limited analog interfaces requiring matched performance across both polarities.

Availability

MMBZ5248BS-7-F is available at Aetrix Electronics and suitable for industrial sensor conditioning, USB port protection, programmable logic rail clamping, and automotive cabin interface designs requiring stable component supply and long-term lifecycle continuity.

Supply support for MMBZ5248BS-7-F 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 MMBZ52xxBS series belongs to Diodes' precision Zener diode product line, engineered specifically for high-reliability voltage reference and transient suppression in miniaturized surface-mount applications demanding tight tolerances and low leakage.

FAQ

What is the maximum continuous reverse voltage this device can withstand without breakdown?

The MMBZ5248BS-7-F has a nominal Zener voltage of 18 V with a guaranteed range of 17.1–18.9 V at 7.0 mA test current. Its maximum non-breakdown reverse voltage is defined by the 14 V rating at which reverse leakage is specified (0.1 µA). Operation above 18.9 V will initiate controlled Zener conduction-not failure-but sustained voltage beyond 20 V risks exceeding 200 mW power limit unless current is strictly limited.

Can both Zener diodes be used simultaneously in the same circuit without interference?

Yes. The two Zener diodes in the MMBZ5248BS-7-F are fully electrically isolated-no internal connection exists between A1/C1 and A2/C2. This allows independent biasing, such as configuring one as a positive clamp to VCC and the other as a negative clamp to GND, with no crosstalk or shared thermal path affecting regulation stability.

Is this part suitable for use in automotive applications requiring AEC-Q200 qualification?

No. The MMBZ5248BS-7-F is not AEC-Q200 qualified. While its operating temperature range (–65 to +150 °C) meets automotive ambient requirements, Diodes Incorporated does not list this specific SOT-363 dual-Zener variant in its AEC-Q200 stress-tested portfolio. For qualified alternatives, consider the AZ23C18 series or consult Diodes' automotive-grade Zener offerings.

How does the SOT-363 package affect thermal performance compared to larger packages like DO-35?

The SOT-363 package has a high thermal resistance of 625 °C/W (junction-to-ambient), significantly limiting power handling versus through-hole DO-35 (≈500 °C/W) or SOD-123 (≈300 °C/W). At 200 mW max dissipation, junction temperature rise exceeds 125 °C above ambient-requiring careful PCB copper area design, minimal trace length, and avoidance of adjacent heat sources to prevent thermal runaway.