Diodes Incorporated MMBZ5248BS-7

Overview

MMBZ5248BS-7 from Diodes Incorporated is a dual-isolated 18 V, 200 mW surface-mount Zener diode in SOT-363 package, with nominal zener voltage 18.0 V (min 17.1 V, max 18.9 V), test current 7.0 mA, and zener impedance 21 Ω at 1 kHz; used for precision voltage regulation and overvoltage protection in space-constrained power management circuits.

For engineers reviewing the MMBZ5248BS-7 datasheet, MMBZ5248BS-7 pinout, MMBZ5248BS-7 application, or MMBZ5248BS-7 equivalent, key selection factors include zener voltage tolerance (±5%), low leakage (<0.1 µA at 14 V), thermal resistance (625 °C/W), and dual-diode isolation in ultra-small footprint for rail clamping and reference generation.

Technical Context

This dual-Zener device integrates two independent 18 V zener elements in a single SOT-363 package, enabling bidirectional voltage clamping or dual-rail referencing without inter-device mismatch. Each diode operates with tightly controlled breakdown characteristics under 7.0 mA test current and exhibits stable regulation across -65°C to +150°C ambient range.

Its planar die construction ensures repeatable zener voltage distribution and low dynamic impedance (21 Ω at 1 kHz), while RoHS-compliant matte tin plating and moisture sensitivity level 1 support high-reliability automated assembly on FR4 PCBs with recommended pad layout per AP02001.

Key Specifications

Pinout & Package

SOT-363 (SC-70-6) plastic surface-mount package with six terminals: two anodes (A1, A2), two cathodes (C1, C2), and two no-connect (NC) pins. Molded UL 94V-0 housing enables reflow compatibility and board-level reliability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C18LT1G and MMBZ5248B-7-F, MMBZ5248BS-7 uniquely delivers matched dual 18 V zeners in one SOT-363, enabling compact bidirectional protection and eliminating inter-device voltage mismatch in critical reference paths.

Availability

MMBZ5248BS-7 is available at Aetrix Electronics and suitable for USB interface protection, industrial sensor reference design, automotive body control modules, and IoT node power sequencing requiring stable component supply and long-term lifecycle continuity.

Supply support for MMBZ5248BS-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, specializing in high-reliability components for industrial, computing, and consumer markets with ISO/TS 16949 and ISO 14001 certifications.

The MMBZ52xxBS series belongs to Diodes' precision Zener portfolio, engineered specifically for space-constrained voltage regulation and bidirectional clamping in portable and automotive electronics where dual-element integration improves system robustness.

FAQ

What is the maximum continuous power dissipation for MMBZ5248BS-7 at 70°C ambient?

At 70°C ambient, MMBZ5248BS-7 dissipates 125 mW continuously. This derives from its 200 mW rating at 25°C and 625 °C/W thermal resistance: derating slope is 0.32 mW/°C, so 200 − (70 − 25) × 0.32 = 125.6 mW. Operation beyond this requires thermal analysis of PCB copper area and airflow.

Can MMBZ5248BS-7 be used for bidirectional ESD protection on a single signal line?

Yes - connect C1 and A2 together as the protected node, A1 to ground, and C2 to V_CC. This configures the two zeners back-to-back, providing ±18 V clamping. The 21 Ω impedance and 0.1 µA leakage ensure minimal signal distortion and DC loading on high-impedance lines like I²C or analog sensors.

How does the SOT-363 package affect solder joint reliability compared to SOT-23?

SOT-363's six-terminal layout increases mechanical anchoring strength versus three-terminal SOT-23, reducing risk of pad lifting during thermal cycling. Its smaller footprint (2.2 × 1.35 mm) demands tighter stencil aperture control, but the lead-free matte tin finish ensures consistent wetting and void-free joints under standard reflow profiles per J-STD-020D Level 1.

Is the 18 V zener voltage guaranteed over the full operating temperature range?

No - the 18.0 V nominal value is specified at 25°C. Over −65°C to +150°C, voltage drift is ±0.08%/°C typical, resulting in ~±1.0 V total shift. For applications requiring tight regulation across temperature, use the device only within −25°C to +85°C or add external compensation circuitry.