Diodes Incorporated MMSTA06-7

Overview

MMSTA06-7 from Diodes Incorporated is an NPN small-signal surface-mount transistor optimized for medium-power amplification and switching in space-constrained designs. It features 80 V V_CEO, 500 mA I_C, 200 mW P_D, 100 MHz f_T, and SOT-323 packaging - used in portable audio preamps, LED driver bias stages, and low-voltage logic-level translators.

For engineers reviewing the MMSTA06-7 datasheet, MMSTA06-7 pinout, MMSTA06-7 application, or MMSTA06-7 equivalent, key selection criteria include V_CEO/V_CBO rating margin, h_FE consistency at 10–100 mA, V_CE(SAT) under 100 mA drive, thermal derating above 25°C ambient, and SOT-323 footprint compatibility with high-density PCB layouts.

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 80 V collector-base and collector-emitter breakdown ratings support operation in 24 V and 48 V intermediate-rail systems.

The device operates across –55°C to +150°C and exhibits low leakage (I_CBO ≤ 100 nA at V_CB = 80 V), enabling reliable performance in automotive body electronics and industrial sensor interfaces where ambient temperature swings exceed 100°C.

Key Specifications

Pinout & Package

Package: SOT-323 - ultra-small plastic surface-mount case (2.20 × 1.35 × 0.90 mm), RoHS-compliant, matte tin-plated leads, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BC846B,215 and MMBT3904LT1G, MMSTA06-7 uniquely balances 80 V rating, SOT-323 compactness, and controlled h_FE range - making it optimal for 24–48 V portable equipment where board area and voltage margin are both critical.

Availability

MMSTA06-7 is available at Aetrix Electronics and suitable for portable audio preamps, LED driver bias control, low-voltage logic level translation, and industrial sensor interface buffers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MMSTA06-7 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 MMSTA06-7 belongs to Diodes' small-signal transistor product line, engineered specifically for high-reliability, space-constrained amplification and switching in consumer, industrial, and automotive applications where thermal efficiency and RoHS compliance are mandatory.

FAQ

What is the maximum allowable collector current for continuous operation?

The MMSTA06-7 supports 500 mA I_C maximum at T_A = 25°C with proper PCB copper pour. Derating begins at 625 °C/W, so at 70°C ambient, max continuous I_C drops to ~320 mA assuming V_CE ≈ 1 V and no forced airflow. Pulse operation allows higher peak currents if duty cycle and pulse width comply with SOA limits.

Is the SOT-323 package compatible with standard reflow profiles?

Yes - the MMSTA06-7's matte tin-plated leads and green molding compound meet JEDEC J-STD-020C Level 1 moisture sensitivity requirements. It is qualified for standard Pb-free reflow profiles (peak 260°C, 30 sec max above 217°C), provided pad layout follows Diodes' AP02001 guidelines for thermal relief and solder wicking control.

How does h_FE vary with collector current and temperature?

h_FE is specified ≥100 at I_C = 10 mA and 25°C. Per Figure 5 in DS30168 Rev. 9, h_FE peaks near 200 at I_C = 30 mA and declines to ~120 at 100 mA. At –40°C, h_FE drops ~25%; at +125°C, it falls ~35% versus room temperature - consistent with typical NPN silicon behavior.

Can MMSTA06-7 replace MMSTA05-7 in existing designs?

Yes - both share identical SOT-323 package, pinout, and thermal characteristics. The MMSTA06-7 offers higher V_CEO/V_CBO (80 V vs. 60 V) and identical I_C/P_D/f_T/h_FE specs. No layout or bias changes are needed; it provides enhanced voltage margin in 24 V+ applications without sacrificing performance or footprint.