Diodes Incorporated DDTC115GE-7

Overview

DDTC115GE-7 from Diodes Incorporated is an NPN pre-biased small-signal transistor with a single built-in bias resistor (R2 = 100 kΩ), housed in an SOT523 package. It delivers V_CEO = 50 V, I_C(max) = 100 mA, h_FE = 82 (at I_C = 5 mA, V_CE = 5 V), and V_CE(SAT) ≤ 0.3 V (at I_C = 10 mA, I_B = 0.5 mA), enabling compact digital switching in automotive lighting control modules.

For engineers reviewing the DDTC115GE-7 datasheet, DDTC115GE-7 pinout, DDTC115GE-7 application, or DDTC115GE-7 equivalent, key selection criteria include R2-only biasing topology, AEC-Q101 qualification, SOT523 thermal resistance (R_θJA = 833 °C/W), and guaranteed h_FE minimum of 82 at low drive current - critical for reliable logic-level interfacing in space-constrained PCBs.

Technical Context

This device implements a monolithic NPN transistor with a single integrated base-emitter pull-up resistor (R2), eliminating external bias components. Its R2-only architecture simplifies circuit design for digital on/off switching while maintaining precise gain control via fixed h_FE ≥ 82 under standard test conditions (I_C = 5 mA, V_CE = 5 V).

Designed for high-reliability automotive applications, it meets AEC-Q101 stress testing requirements and operates across –55 °C to +150 °C. The SOT523 package supports high-density mounting and achieves 150 mW power dissipation with defined thermal derating per JEDEC J-STD-020 Level 1 moisture sensitivity.

Key Specifications

Pinout & Package

SOT523 is a 3-terminal surface-mount plastic package measuring 1.60 × 1.60 × 0.75 mm (L × W × H), with matte tin-plated terminals solderable per MIL-STD-202 Method 208 and rated UL 94V-0.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN pre-biased transistor applications.

Compared with DDTC114GE-7-F and NSVD115FXT5G, DDTC115GE-7 offers superior gain stability and smallest footprint among R2 = 100 kΩ pre-biased transistors qualified to AEC-Q101 - making it optimal for next-gen automotive ECUs where space and predictability are critical.

Availability

DDTC115GE-7 is available at Aetrix Electronics and suitable for automotive lighting control, industrial PLC input conditioning, and medical status indicator circuits requiring stable component supply with full AEC-Q101 traceability and green compliance.

Supply support for DDTC115GE-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, manufacturing, and sales operations across Asia, Europe, and North America.

This part belongs to the DDTC R2-Only Series - a family of pre-biased transistors engineered specifically for simplified digital switching in automotive and industrial control systems where board space and reliability are constrained.

FAQ

What is the function of the R2 resistor in DDTC115GE-7?

The R2 resistor (100 kΩ ±30%) connects internally between base and emitter, forming a fixed bias network that allows direct connection to logic outputs without external components. It sets the base current for predictable saturation, enabling robust switching behavior across temperature and process variation.

Is DDTC115GE-7 suitable for linear amplifier applications?

No - this device is optimized for digital switching, not analog amplification. Its R2-only biasing lacks collector feedback or adjustable operating point, and its h_FE specification is guaranteed only at I_C = 5 mA, V_CE = 5 V. Linear use risks thermal instability and gain nonlinearity.

Does DDTC115GE-7 require a heatsink in typical operation?

No heatsink is required. With P_D = 150 mW and R_θJA = 833 °C/W on FR-4, junction temperature rise is <125 °C at full power - well within the –55 °C to +150 °C operating range. Derating begins above 25 °C ambient per Figure 1 in DS30316.

How does the SOT523 package affect PCB assembly yield?

SOT523's 0.5 mm lead pitch and 1.6 mm × 1.6 mm body demand precision stencil design and reflow profiling, but its J-STD-020 Level 1 moisture sensitivity eliminates bake requirements. Diodes' recommended pad layout (X = 0.40 mm, Y = 0.51 mm) supports >99.5% first-pass yield with standard Type 3 solder paste.