Toshiba Semiconductor and Storage TTC1949-GR,LF

Overview

TTC1949-GR,LF from Toshiba Electronic Devices & Storage Corporation is a silicon NPN epitaxial bipolar transistor designed for low-frequency power amplification. It features V_CEO = 50 V, I_C = 500 mA, P_C = 200 mW, h_FE (GR rank) = 180–390, and f_T = 100 MHz typical, operating in S-Mini package with 3-pin configuration (Base–Emitter–Collector).

For engineers reviewing the TTC1949-GR,LF datasheet, TTC1949-GR,LF pinout, TTC1949-GR,LF application, or TTC1949-GR,LF equivalent, key selection criteria include DC current gain range, saturation voltage at high collector current, thermal derating on FR4 boards, and suitability for Class-A/B audio output stages requiring stable h_FE and low V_CE(sat).

Technical Context

The TTC1949-GR,LF operates as a general-purpose NPN switching and linear amplifier transistor with epitaxial base construction for improved gain consistency and frequency response. Its GR h_FE rank (180–390) ensures tighter DC current gain distribution than Y-rank variants, supporting predictable biasing in discrete amplifier designs.

Designed for operation up to 150 °C junction temperature, it uses a thermally optimized S-Mini package mounted on standard 25.4 mm × 25.4 mm × 1.6 mm FR4 board with defined copper pad layout (0.42 mm² × 3). Absolute maximum ratings are specified at T_a = 25 °C with derating applied above that ambient.

Key Specifications

Pinout & Package

S-Mini package: ultra-small surface-mount plastic package (12 mg typical weight), 3-terminal configuration with gull-wing leads, optimized for manual and automated assembly on FR4 PCBs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN bipolar transistor applications.

Compared with 2SC4738(TE85L,F) and MMBT4401LT1G, the TTC1949-GR,LF offers superior h_FE consistency (GR rank), optimal V_CEO/I_C balance for 12 V systems, and proven thermal performance on standard FR4-making it preferred for production-grade low-frequency power amplification where gain stability and manufacturability matter.

Availability

TTC1949-GR,LF is available at Aetrix Electronics and suitable for audio power amplifiers, DC motor drivers, LED constant-current regulators, and signal-level voltage amplifiers requiring stable component supply and consistent h_FE performance across production batches.

Supply support for TTC1949-GR,LF 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

Toshiba Electronic Devices & Storage Corporation designs and manufactures discrete semiconductors, power devices, and storage solutions with emphasis on reliability, efficiency, and industrial-grade robustness.

The TTC1949-GR,LF belongs to Toshiba's S-Mini packaged bipolar transistor family, engineered for cost-effective, high-yield implementation in consumer and industrial low-frequency analog circuits where gain consistency and thermal predictability are critical.

FAQ

What is the h_FE range guaranteed for TTC1949-GR,LF?

The TTC1949-GR,LF is binned to the GR h_FE rank, guaranteeing a DC current gain of 180 to 390 when measured at V_CE = 1 V and I_C = 100 mA. This tighter specification than the Y-rank variant supports repeatable bias design in production amplifiers without individual device characterization. The TTC1949-GR,LF datasheet explicitly defines this range in Section 4, Note 1.

Can TTC1949-GR,LF be used in switching applications?

Yes, the TTC1949-GR,LF supports switching use due to its low V_CE(sat) of ≤0.4 V at I_C = 500 mA and I_B = 50 mA, enabling efficient saturated operation. Its 100 MHz f_T also allows reliable turn-on/turn-off behavior up to several hundred kHz. However, switching speed is limited by minority-carrier storage time-not specified in the TTC1949-GR,LF datasheet-so it is best suited for low-frequency (<100 kHz) digital or PWM control.

What is the thermal resistance of TTC1949-GR,LF on a standard PCB?

The TTC1949-GR,LF specifies its absolute maximum ratings based on mounting on a 25.4 mm × 25.4 mm × 1.6 mm FR4 board with three 0.42 mm² copper pads. While the datasheet does not list an explicit θ_JA, the 200 mW power dissipation limit and derating curve (Fig. 6.4) indicate θ_JA ≈ 500 °C/W under those conditions. For accurate thermal modeling, users must validate with actual board layout and airflow per Toshiba's Reliability Handbook guidelines.

Is TTC1949-GR,LF RoHS compliant?

Yes, the TTC1949-GR,LF is RoHS compliant and lead-free, as confirmed by Toshiba's environmental documentation and marking suffix ",LF". The "LF" denotes lead-free plating and halogen-free molding compound. Full compliance data-including substance declarations and test reports-is available through Toshiba's official product page and authorized distributors like Digi-Key and Mouser.

What is the maximum operating junction temperature for TTC1949-GR,LF?

The maximum junction temperature (T_j) for TTC1949-GR,LF is 150 °C, as stated in the Absolute Maximum Ratings table. Operation above this temperature risks permanent degradation of h_FE, increased leakage, and accelerated failure. Derating is required above T_a = 25 °C per the PC–T_a curve (Fig. 6.4), and the TTC1949-GR,LF must be used within this thermal envelope to maintain reliability per Toshiba's Semiconductor Reliability Handbook.