Diodes Incorporated DDTC115GUA-7-F

Overview

DDTC115GUA-7-F from Diodes Incorporated is an NPN pre-biased small-signal transistor with a single built-in 100 kΩ bias resistor (R2 only), housed in a SOT-323 package. It delivers V_CEO = 50 V, I_C(max) = 100 mA, V_CE(sat) ≤ 0.3 V at I_C = 10 mA/I_B = 0.5 mA, and h_FE = 82 (typ.) at I_C = 5 mA/V_CE = 5 V, used in compact logic-level interface and load switching circuits.

For engineers reviewing the DDTC115GUA-7-F datasheet, DDTC115GUA-7-F pinout, DDTC115GUA-7-F application, or DDTC115GUA-7-F equivalent, key selection criteria include verified R2-only bias topology, guaranteed h_FE ≥ 82 at 5 mA, SOT-323 thermal resistance (R_θJA = 625 °C/W), and JEDEC-compliant lead-free plating for automated assembly.

Technical Context

This discrete NPN transistor integrates a precision 100 kΩ base-emitter pull-up resistor (R2) without R1, simplifying high-side switch design and reducing external component count. Its epitaxial planar die construction ensures stable gain and low leakage across -55°C to +150°C operating range.

The device operates with V_EBO = 5 V and I_EBO = 30–58 μA at V_EB = 4 V, supporting reliable turn-on in 3.3 V/5 V digital logic interfaces. Its f_T = 250 MHz enables use in moderate-speed switching applications up to ~10 MHz.

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 height), UL 94V-0 rated, moisture sensitivity level 1, lead-free matte tin plating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DDTC115GUA-7-F, DDTC144GUA-7-F offers lower gain and bias resistance for more predictable saturation in variable-temperature logic interfaces, while NSVD115FCT1G trades thermal efficiency for broader h_FE tolerance and legacy package compatibility.

Availability

DDTC115GUA-7-F is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller GPIO interfaces, and low-power sensor power management requiring stable component supply and RoHS-compliant sourcing.

Supply support for DDTC115GUA-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, energy-efficient components for industrial, computing, and consumer markets.

The DDTC (R2-only series) UA family targets space-constrained digital interface applications, delivering integrated biasing and guaranteed gain to simplify logic-level switching designs.

FAQ

What is the function of the internal 100 kΩ resistor in DDTC115GUA-7-F?

The internal 100 kΩ resistor (R2) connects between base and emitter, forming a pull-up network that biases the transistor into saturation when a logic-high voltage is applied to the base. This eliminates the need for an external base resistor in high-side switch configurations, reducing component count and PCB area.

Can DDTC115GUA-7-F replace a standard NPN transistor like BC847 in existing designs?

No - DDTC115GUA-7-F is not a drop-in replacement for BC847 due to its integrated R2 bias network and lack of R1. It requires redesign to remove external base resistors and verify V_BE compatibility. Use only where pre-biased topology is explicitly intended.

What is the maximum ambient temperature for continuous operation at full 100 mA collector current?

At full I_C = 100 mA, derating begins at 25°C per the datasheet's Fig. 1 curve. With R_θJA = 625 °C/W and P_D = 200 mW, junction temperature rise is 125°C, limiting continuous 100 mA operation to ≤ 25°C ambient unless heatsinking or airflow is added.

Is DDTC115GUA-7-F suitable for automotive applications?

While qualified for -55°C to +150°C operation and RoHS-compliant, DDTC115GUA-7-F is not AEC-Q101 qualified. It may be used in non-safety-critical automotive subsystems (e.g., infotainment indicators) only after full system-level validation per OEM requirements.