Diodes Incorporated MMBZ5239BS-7

Overview

MMBZ5239BS-7 from Diodes Incorporated is a dual isolated 200 mW surface-mount Zener diode in SOT-363 package, with nominal zener voltage 9.1 V (min 8.65 V, max 9.56 V) at 20 mA test current, 10 Ω zener impedance at 20 mA, and 3.0 μA reverse leakage at 7.0 V. It serves as precision voltage reference and overvoltage clamp in low-power analog signal conditioning circuits.

For engineers reviewing the MMBZ5239BS-7 datasheet, MMBZ5239BS-7 pinout, MMBZ5239BS-7 application, or MMBZ5239BS-7 equivalent, key selection criteria include zener voltage tolerance (±5%), thermal resistance (625 °C/W), dual-diode isolation, RoHS-compliant matte tin plating, and SOT-363 footprint compatibility with automated pick-and-place assembly.

Technical Context

This device integrates two electrically isolated Zener diodes in a single ultra-small SOT-363 package, enabling compact dual-rail voltage regulation or bidirectional transient suppression without cross-coupling. Each diode operates independently with identical electrical specs: 9.1 V nominal breakdown, 20 mA test current, and 10 Ω dynamic impedance at rated current.

Its planar die construction ensures stable zener characteristics across temperature (–65 °C to +150 °C), while the 200 mW power rating and 625 °C/W junction-to-ambient thermal resistance define safe operating limits on standard FR4 PCBs with recommended pad layout.

Key Specifications

Pinout & Package

Package: SOT-363 (dual-isolated Zener configuration, 6-pin, 2.2 mm × 1.35 mm × 0.95 mm). Terminals are solderable per MIL-STD-202, Method 208; polarity follows top-view schematic with C1/A1/C2/A2/NC/NC labeling.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C9V1-7-F and MMBZ5239B-7-F, MMBZ5239BS-7 uniquely delivers two isolated 9.1 V Zeners in one SOT-363, reducing component count by 50% and eliminating inter-diode crosstalk in high-precision analog systems.

Availability

MMBZ5239BS-7 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, USB-C power delivery clamp circuits, automotive body control modules, and low-power wireless node reference designs requiring stable component supply and RoHS-compliant sourcing.

Supply support for MMBZ5239BS-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.

The MMBZ52xxBS series belongs to Diodes' precision Zener portfolio, engineered specifically for space-constrained, low-power voltage reference and transient suppression in consumer, industrial, and automotive electronics.

FAQ

What is the maximum continuous reverse voltage that can be safely applied to MMBZ5239BS-7 without breakdown?

The device exhibits 9.1 V nominal zener voltage at 20 mA test current, with guaranteed breakdown occurring between 8.65 V and 9.56 V. Applying reverse voltage below 8.65 V ensures no significant conduction; sustained operation above 9.56 V risks exceeding power rating and thermal runaway. Derating applies above 25 °C ambient per Fig. 1.

How does the dual-isolation structure impact PCB layout and grounding strategy?

The two Zeners share no internal connection-C1/A1 and C2/A2 form fully independent terminals. Layout must treat them as separate components: each requires its own current-limiting resistor and ground return path. Shared ground planes are acceptable, but shared cathode traces introduce coupling and invalidate isolation benefits.

Can MMBZ5239BS-7 be used in AC signal clipping applications?

Yes-its dual-diode topology supports symmetrical clipping when configured back-to-back (A1–C2 and A2–C1 tied), delivering ±9.1 V clipping thresholds. Forward voltage drop (0.9 V @ 10 mA) adds ~1.8 V total deadband, making it suitable for audio-level signal limiting where precision is secondary to compactness.

Is the SOT-363 package compatible with standard reflow profiles for lead-free assembly?

Yes-the device is RoHS-compliant with matte tin finish and rated for peak reflow temperatures up to 260 °C per J-STD-020D Level 1 moisture sensitivity. Its 0.006 g mass and plastic mold compound ensure uniform heating; recommended profile uses 60–90 sec above 217 °C with ramp rates ≤3 °C/sec.