Diodes Incorporated 2DA1774QLP-7B

Overview

2DA1774QLP-7B from Diodes Incorporated is a 40V PNP small-signal transistor in X1-DFN1006-3 package, rated for −100mA collector current and −40V V_CEO, with 0.4W power dissipation at T_A = +25°C on minimum pad layout. It delivers h_FE = 120–270 at V_CE = −6V/IC = −1mA and f_T = 100MHz, and is AEC-Q101 qualified for automotive applications including LED driver biasing and load switching.

For engineers reviewing the 2DA1774QLP-7B datasheet, 2DA1774QLP-7B pinout, 2DA1774QLP-7B application, or 2DA1774QLP-7B equivalent, key selection criteria include its −40V V_CEO, 120–270 DC current gain range, 0.4W thermal-limited power dissipation, 310°C/W R_θJA (min pad), and AEC-Q101 qualification status for automotive-grade reliability.

Technical Context

This PNP bipolar junction transistor operates in linear and saturation modes with verified breakdown ratings: V_CBO = −50V, V_CEO = −40V, and V_EBO = −5V. Its f_T = 100MHz and C_obo = 5.0pF at V_CB = −12V confirm suitability for medium-frequency switching and analog amplification up to ~10MHz in compact layouts.

Thermal design is constrained by R_θJA = 310°C/W (min pad) and R_θJL = 120°C/W - the latter enabled by direct thermal coupling via the exposed collector pad. ESD robustness includes HBM = 4kV and MM = 200V, supporting handling in production environments without special precautions beyond standard ESD controls.

Key Specifications

Pinout & Package

Package: X1-DFN1006-3 - 1.0mm × 0.6mm footprint, 0.5mm height, exposed collector pad for thermal and electrical connection. Molded green compound, NiPdAu-plated terminals, MSL Level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DXT3904P-7, the 2DA1774QLP-7B offers tighter h_FE consistency and lower cost for ≤100mA loads; versus 2DA1774Q-7, it delivers 13× smaller area and 55% lower R_θJA on optimized PCBs - critical for AEC-Q101-compliant automotive modules.

Availability

2DA1774QLP-7B is available at Aetrix Electronics and suitable for automotive LED drivers, industrial sensor bias circuits, portable battery protection modules, and consumer appliance motor control requiring stable component supply, AEC-Q101 compliance, and ultra-compact packaging.

Supply support for 2DA1774QLP-7B 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 the Americas.

The 2DA1774QLP belongs to Diodes' AEC-Q101-qualified small-signal transistor product line, engineered specifically for space- and reliability-critical automotive and industrial signal switching and biasing applications.

FAQ

What is the maximum allowable junction temperature for continuous operation?

The 2DA1774QLP-7B has an operating junction temperature range of −55°C to +150°C. For continuous DC operation, the maximum junction temperature must remain ≤+150°C, which requires limiting power dissipation based on ambient temperature and PCB thermal design - e.g., at T_A = +85°C and R_θJA = 310°C/W, max P_D ≈ 0.21W.

Is the exposed collector pad electrically isolated or must it be connected to circuit ground?

The exposed collector pad is electrically connected to Pin 3 (collector) and must be soldered to a PCB copper area tied to the collector net. It is not isolated and serves both electrical conduction and thermal dissipation functions - floating or grounding the pad independently violates the device's thermal and electrical specifications.

Can this transistor replace a standard SOT-23 PNP in existing designs?

No direct drop-in replacement is possible due to different pinout (X1-DFN1006-3 uses emitter-base-collector left-to-right vs. SOT-23's emitter-collector-base) and soldering requirements. Layout redesign and requalification are mandatory, though functional equivalence exists for V_CEO, I_C, and h_FE parameters.

Does the AEC-Q101 qualification cover all temperature grades and test conditions listed in the datasheet?

Yes - AEC-Q101 qualification for 2DA1774QLP-7B includes full stress testing across −55°C to +150°C operating range, HTOL, TC, UHAST, and ESD per JESD22-A114/A115, with PPAP documentation available. All absolute maximum ratings and electrical characteristics in DS31438 Rev. 6-2 apply under qualified conditions.