onsemi SZMM3Z7V5T1G

Overview

SZMM3Z7V5T1G from onsemi is a 7.5 V ±5% Zener voltage regulator diode in SOD−323 package, rated for 300 mW steady-state power dissipation at 25°C, with 15 Ω dynamic impedance at 5 mA test current and 1 μA leakage current at 5.0 V reverse bias - used for precision voltage reference and overvoltage protection in space-constrained portable electronics.

For engineers reviewing the SZMM3Z7V5T1G datasheet, pinout, applications, or equivalent options, key selection factors include its AEC−Q101 qualification, 140 pF capacitance at 0 V/1 MHz, −65°C to +150°C junction temperature range, and Pb−free SOD−323 footprint compatibility with high-density PCB layouts.

Technical Context

This device operates as a two-terminal voltage reference by maintaining a stable reverse breakdown voltage across its cathode-anode terminals under controlled Zener current. Its regulation accuracy depends on thermal stability (2.5 mV/°C temperature coefficient), low dynamic impedance (15 Ω), and tight initial tolerance (±5% at 7.5 V nominal).

The SOD−323 package enables surface-mount integration with minimal board area (1.7 mm × 1.25 mm) and low profile (0.9 mm height), while its Class 3 ESD rating (>16 kV HBM) supports robust handling in automated assembly lines and end-use environments like handheld portables.

Key Specifications

Pinout & Package

SZMM3Z7V5T1G is housed in a SOD−323 (Case 477) surface-mount plastic package with cathode indicated by a polarity band. Dimensions: 1.7 mm × 1.25 mm × 0.9 mm (L × W × H), weight 4.507 mg/unit, UL 94 V−0 flammability rating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX384-B7V5 and MMSZ5236B, SZMM3Z7V5T1G offers the optimal balance of AEC−Q101 compliance, 140 pF low capacitance, and minimal 1.7 mm × 1.25 mm footprint - making it uniquely suited for next-generation automotive cabin sensors and miniaturized medical wearables where space, reliability, and signal integrity are co-constrained.

Availability

SZMM3Z7V5T1G is available at Aetrix Electronics and suitable for automotive cabin electronics, portable medical diagnostics, and high-density industrial IoT edge nodes requiring stable component supply across extended product lifecycles.

Supply support for SZMM3Z7V5T1G 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

onsemi (Nasdaq: ON) is a global semiconductor supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.

SZMM3Z7V5T1G belongs to the MM3ZxxxT1G/SZMM3ZxxxT1G series - engineered specifically for space-constrained voltage regulation in automotive and portable electronics, with emphasis on AEC−Q101 reliability and Pb−free manufacturability.

FAQ

What is the Zener voltage tolerance of SZMM3Z7V5T1G?

The SZMM3Z7V5T1G has a nominal Zener voltage of 7.5 V with a tolerance of ±5%, meaning the actual breakdown voltage falls between 7.0 V and 7.9 V when tested at I_ZT = 5 mA and T_A = 25°C. This tolerance is guaranteed per the Electrical Characteristics table in the official onsemi datasheet (Rev. 11, September 2014), and applies to all units shipped under this part number.

Is SZMM3Z7V5T1G suitable for automotive applications?

Yes, SZMM3Z7V5T1G is AEC−Q101 qualified and PPAP capable, explicitly designated for automotive and other applications requiring unique site and control change requirements. The "SZ" prefix confirms its qualification status, and it meets stringent reliability, thermal, and ESD requirements defined in the AEC−Q101 standard - making it appropriate for use in engine control units, body electronics, and cabin sensor systems.

What is the maximum power dissipation of SZMM3Z7V5T1G at 85°C ambient?

At 85°C ambient temperature, SZMM3Z7V5T1G's maximum power dissipation is derated linearly from 300 mW at 25°C using a derating factor of 2.4 mW/°C. This yields 300 mW − (85 − 25) × 2.4 mW = 156 mW. This value assumes mounting on an FR-4 board with a 1 cm² copper pad, as specified in the Maximum Ratings table of the onsemi datasheet.

Does SZMM3Z7V5T1G have a specified forward voltage?

Yes, SZMM3Z7V5T1G has a maximum forward voltage (V_F) of 0.9 V at I_F = 10 mA, as confirmed in the Electrical Characteristics table. This parameter is relevant when the device is used in forward-biased configurations - such as ESD protection clamping or polarity detection - and ensures predictable conduction behavior below Zener breakdown.

What is the thermal resistance junction-to-ambient (R_JA) for SZMM3Z7V5T1G?

The thermal resistance junction-to-ambient (R_JA) for SZMM3Z7V5T1G is 416°C/W, measured on an FR-4 printed circuit board with single-sided copper and a 1 cm² mounting pad. This value is critical for thermal design validation and determines how much temperature rise occurs per milliwatt of power dissipated - for example, at 300 mW, junction temperature rises ~125°C above ambient under these specific board conditions.