Diodes Incorporated MMBZ5252BS-7-F

Overview

MMBZ5252BS-7-F from Diodes Incorporated is a dual isolated 24 V ±5% Zener diode pair in SOT-363 package, rated for 200 mW total power dissipation, 33 Ω maximum Zener impedance at 5.2 mA, and 0.1 μA reverse leakage at 18 V, used for precision voltage reference and overvoltage clamping in space-constrained analog signal conditioning circuits.

For engineers reviewing the MMBZ5252BS-7-F datasheet, MMBZ5252BS-7-F pinout, MMBZ5252BS-7-F application, or MMBZ5252BS-7-F equivalent, key selection criteria include nominal Zener voltage tolerance (±5%), low leakage (<0.1 μA @ VR = 18 V), dual-diode isolation integrity, thermal resistance (625 °C/W), and RoHS-compliant matte tin plating on Alloy 42 leadframe.

Technical Context

This device integrates two electrically isolated Zener diodes in a single ultra-small SOT-363 surface-mount package, enabling bidirectional voltage regulation or independent reference generation without cross-coupling. Each diode operates with specified test current of 5.2 mA and exhibits tight 22.8–25.2 V breakdown range at 25 °C.

Its planar die construction ensures stable Zener characteristics across -65 to +150 °C operating temperature, while the 625 °C/W junction-to-ambient thermal resistance requires careful PCB pad layout per AP02001 for sustained 200 mW operation. The 0.006 g mass and Level 1 moisture sensitivity support high-reliability automated assembly.

Key Specifications

Pinout & Package

SOT-363 package with six terminals: two anodes (A1, A2), two cathodes (C1, C2), and two no-connect (NC) pins. Molded plastic case meets UL 94V-0 flammability rating; terminals are solderable per MIL-STD-202, Method 208.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C24LT1G and MMBZ5252B-7-F, MMBZ5252BS-7-F uniquely delivers two isolated 24 V Zeners in one SOT-363, reducing component count and interconnect parasitics-critical for high-precision, space-limited analog designs where channel crosstalk must be minimized.

Availability

MMBZ5252BS-7-F is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, USB port ESD protection interface, and automotive body control module power rails requiring stable component supply and long-term lifecycle continuity.

Supply support for MMBZ5252BS-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 and manufacturing operations across Asia and the Americas.

This device belongs to the MMBZ52xxBS series of dual-Zener diodes engineered specifically for high-density voltage reference and bidirectional clamping in portable, automotive, and industrial electronics where board space and isolation integrity are critical.

FAQ

What is the maximum surge power rating for MMBZ5252BS-7-F?

The device supports up to 100 W non-repetitive peak surge power for 1 ms pulses, as shown in Figure 6 of DS31039 Rev. 15-2. This rating assumes proper PCB thermal relief and applies only to single-event transients-not repetitive surges. Derating is required above 25 °C ambient per the power derating curve in Figure 1.

Can both Zeners operate simultaneously at full 200 mW?

No. The 200 mW rating is total package power dissipation. Simultaneous operation must respect the sum of individual diode power: P_Z1 + P_Z2 ≤ 200 mW. At 5.2 mA each, combined dissipation is ~249 mW (24 V × 5.2 mA × 2), exceeding rating-thus derating to ≤4.2 mA per diode is required for continuous dual operation.

Is the SOT-363 package compatible with standard reflow profiles?

Yes. With Level 1 moisture sensitivity and lead-free matte tin plating, MMBZ5252BS-7-F is qualified for IPC/JEDEC J-STD-020D-compliant reflow profiles, including peak temperatures up to 260 °C. No pre-bake is required, and the UL 94V-0 mold compound withstands standard thermal cycling without delamination.

How does the "KK2" marking code correlate to electrical specs?

"KK2" is the top-side laser marking for MMBZ5252BS-7-F, directly indicating 24 V nominal Zener voltage per the Electrical Characteristics table on page 2 of DS31039. It corresponds to min/max values of 22.8 V and 25.2 V at 5.2 mA, and is distinct from adjacent codes KK1 (22 V) and KK4 (27 V).