Diodes Incorporated MMSZ5246BS-7-F

Overview

MMSZ5246BS-7-F from Diodes Incorporated is a surface-mount 16 V Zener diode in SOD-323 package, rated for 200 mW power dissipation, with nominal Zener voltage 16.0 V (min 15.2 V, max 16.8 V) at 7.8 mA test current, 17 Ω dynamic impedance at test current, and 0.1 µA reverse leakage at 12 V. It serves as a precision voltage reference or overvoltage clamp in low-power analog signal conditioning circuits.

For engineers reviewing the MMSZ5246BS-7-F datasheet, MMSZ5246BS-7-F pinout, MMSZ5246BS-7-F application, or MMSZ5246BS-7-F equivalent, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (625 °C/W), cathode-band polarity marking, SOD-323 footprint compatibility, and RoHS-compliant lead-free plating.

Technical Context

This device operates as a silicon planar Zener diode, utilizing controlled avalanche breakdown to maintain stable reverse-bias voltage regulation. Its 16 V nominal Zener voltage targets mid-range reference needs in battery-powered sensors and low-voltage LDO feedback networks.

The SOD-323 package enables high-density PCB layouts while supporting automated pick-and-place assembly. With 0.004 g mass and UL 94V-0 flammability rating, it meets stringent space-constrained and safety-critical requirements in portable electronics.

Key Specifications

Pinout & Package

Package: SOD-323 - surface-mount plastic case, 2.30–2.70 mm length, 1.20–1.40 mm width, 0.25–0.35 mm thickness, cathode band marking on top surface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX584C16-7-F and MMBZ5246BS-7-F, MMSZ5246BS-7-F offers optimal balance of proven reliability in SOD-323, industry-standard 200 mW rating, and lowest leakage among 16 V Zeners in its class-making it preferred for battery-sensitive and high-volume consumer designs.

Availability

MMSZ5246BS-7-F is available at Aetrix Electronics and suitable for portable battery monitoring, industrial sensor signal conditioning, USB-C power negotiation reference, and low-power IoT node voltage supervision requiring stable component supply and consistent parametric performance across production lots.

Supply support for MMSZ5246BS-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 centers across Asia and manufacturing facilities in China, Taiwan, and the U.S.

The MMSZ52xxBS series belongs to Diodes' general-purpose Zener diode product line, engineered specifically for cost-sensitive, high-reliability voltage regulation and transient suppression in consumer, computing, and industrial end-equipment.

FAQ

What is the maximum reverse voltage this Zener can safely clamp without degradation?

The MMSZ5246BS-7-F is rated for 12 V reverse voltage (V_R) at which leakage remains ≤0.1 µA. Its absolute maximum non-destructive reverse voltage is defined by its 200 mW power limit and thermal resistance: at 25°C ambient, sustained operation above ~16.8 V risks exceeding P_D if current exceeds 11.9 mA. Transient clamping beyond V_Z is permitted per Figure 2, provided pulse energy stays within SOA limits.

Does this part require derating at elevated ambient temperatures?

Yes. Per Figure 1, power dissipation must be linearly derated above 25°C at 0.32 mW/°C (200 mW ÷ 625 °C/W). At 85°C ambient, maximum allowable power drops to 128 mW. This requires adjusting I_Z or adding heatsinking in thermally constrained enclosures to avoid junction overheating.

How is polarity identified on the SOD-323 package?

Polarity is indicated by a visible cathode band on the top surface of the SOD-323 case, aligned with the cathode terminal. The band corresponds to the shorter lead in through-hole equivalents and must connect to the higher-potential node during Zener operation. Mechanical drawings in AP02002 confirm band position relative to package outline dimensions.

Is this Zener diode suitable for use in automotive applications?

No. While the MMSZ5246BS-7-F operates from –65°C to +150°C, it is not AEC-Q200 qualified and lacks automotive-specific screening, traceability, or failure-rate reporting. Diodes Incorporated offers the AZ series (e.g., AZMMSZ5246BS) for automotive-grade Zener applications requiring PPAP documentation and stress testing.