Diodes Incorporated MMSTA05-7-F

Overview

MMSTA05-7-F from Diodes Incorporated is an NPN small-signal surface-mount transistor in SOT-323 package, rated for 60 V V_CEO, 500 mA I_C, and 200 mW P_D, optimized for medium-power amplification and switching in space-constrained PCBs.

For engineers reviewing the MMSTA05-7-F datasheet, MMSTA05-7-F pinout, MMSTA05-7-F application, or MMSTA05-7-F equivalent, key selection criteria include V_CEO/V_CBO rating, h_FE consistency at 10–100 mA, V_CE(SAT) under 100 mA drive, thermal resistance (625 °C/W), and RoHS-compliant green molding compound compliance.

Technical Context

This NPN bipolar junction transistor uses epitaxial planar die construction to ensure stable DC current gain (h_FE = 100 min at I_C = 10 mA, V_CE = 1.0 V) and high-frequency response (f_T = 100 MHz at V_CE = 2.0 V, I_C = 10 mA). Its low V_CE(SAT) (≤0.25 V @ I_C = 100 mA, I_B = 10 mA) supports efficient switching in low-voltage logic interfaces.

Designed for FR-4 PCB mounting with Diodes Inc.'s AP02001 pad layout, it achieves 625 °C/W junction-to-ambient thermal resistance and operates across –55 °C to +150 °C. Moisture sensitivity is Level 1 per J-STD-020C, enabling standard reflow without baking.

Key Specifications

Pinout & Package

Package: SOT-323 - ultra-small surface-mount plastic case (2.00–2.20 mm length, 1.15–1.35 mm width, 0.25–0.40 mm thickness), UL 94V-0 rated, lead-free matte tin plating over Alloy 42 leadframe.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN small-signal transistor applications.

Compared with BC846B,215 and MMBT3904LT1G, MMSTA05-7-F uniquely balances 60 V rating, SOT-323 miniaturization, and guaranteed h_FE ≥100-making it optimal for compact, medium-voltage switching and amplification where footprint and voltage headroom are jointly constrained.

Availability

MMSTA05-7-F is available at Aetrix Electronics and suitable for portable audio amplifiers, LED driver circuits, logic-level interface modules, and sensor signal conditioning preamps requiring stable component supply and long-term manufacturability.

Supply support for MMSTA05-7-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, specializing in high-reliability, industry-standard components for consumer, industrial, and automotive markets.

The MMSTA05-7-F belongs to Diodes' small-signal transistor product line, engineered for space-constrained, medium-power linear and switching applications where consistent gain, low saturation voltage, and green packaging are design-critical.

FAQ

What is the maximum allowable junction temperature for MMSTA05-7-F?

The absolute maximum junction temperature is +150 °C, and the storage temperature range matches this. Operation at T_J = 150 °C requires derating power dissipation per Fig. 1 in the datasheet-P_D drops to ~100 mW at 100 °C ambient due to R_θJA = 625 °C/W. Thermal design must account for PCB copper area and airflow.

Is MMSTA05-7-F pin-compatible with other SOT-323 transistors?

Yes-MMSTA05-7-F follows standard SOT-323 pinout (Emitter-Base-Collector on pins 1-2-3), matching industry conventions used by BC846, MMBT3904, and DTA114 series. However, electrical parameters differ significantly; direct substitution requires validation of V_CEO, h_FE, and V_CE(SAT) in the target circuit.

Does MMSTA05-7-F require special handling during reflow soldering?

No special handling is required: MMSTA05-7-F has Moisture Sensitivity Level 1 per J-STD-020C, meaning it can be stored indefinitely at ≤30 °C/60% RH and placed directly into standard lead-free reflow profiles (peak 260 °C) without baking or dry-packing.

How does the "Green" molding compound affect reliability?

The halogen-free, antimony-free green molding compound meets IPC-1752A reporting requirements and eliminates corrosion risks associated with brominated flame retardants. It maintains UL 94V-0 flammability rating and shows no degradation in thermal cycling or high-humidity reliability testing versus legacy compounds.