Diodes Incorporated DEMD48-7

Overview

DEMD48-7 from Diodes Incorporated is a dual pre-biased transistor array integrating one NPN and one PNP silicon epitaxial planar transistor with integrated base resistors (R1=47kΩ, R2=47kΩ for Q1; R1=2.2kΩ, R2=47kΩ for Q2) in a single SOT-563 package. It operates across -55°C to +150°C, supports ±100mA DC output current, and delivers V_CE(SAT) ≤ 0.15V (Q1) and ≤ -0.1V (Q2), enabling compact level-shifting and signal inversion in portable power management circuits.

For engineers reviewing the DEMD48-7 datasheet, DEMD48-7 pinout, DEMD48-7 application, or DEMD48-7 equivalent, key selection criteria include verified dual-polarity switching capability, guaranteed resistor ratio tolerance (R2/R1 = 0.8–1.2 for Q1, 17–26 for Q2), thermal resistance of 417°C/W on FR-4, and RoHS-compliant matte tin terminations suitable for automated SMT assembly.

Technical Context

The DEMD48-7 integrates two independent pre-biased transistors sharing no internal connection: Q1 (NPN) features symmetrical 47kΩ input resistors and h_FE ≥ 80 at I_C = 5mA; Q2 (PNP) uses asymmetric 2.2kΩ/47kΩ resistors and achieves h_FE ≥ 100 at I_C = -10mA. Both exhibit low leakage: I_CEO ≤ 1.5μA (Q1), ≤ -1.5μA (Q2) at rated V_CE.

Its SOT-563 package provides six terminals with dedicated emitter/collector/base connections per transistor - no shared pins - and supports simultaneous high-side (Q2) and low-side (Q1) drive in push-pull configurations without external bias networks.

Key Specifications

Pinout & Package

SOT-563 surface-mount package: 1.6mm × 1.2mm footprint, 0.5mm height, 0.6mm pitch, UL 94V-0 molded plastic body, matte tin-plated copper leadframe, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NSVD4858PFR and EMD48T2R, DEMD48-7 offers balanced gain (h_FE ≥80/100), standardized 47kΩ/47kΩ Q1 bias, and optimal thermal resistance (417°C/W) for cost-sensitive industrial controls requiring proven field reliability.

Availability

DEMD48-7 is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller I/O expansion, industrial push-pull interfaces, and automotive door modules requiring stable component supply across extended temperature ranges and high-volume production cycles.

Supply support for DEMD48-7 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, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, automotive, and consumer markets.

The DEMD48-7 belongs to Diodes' pre-biased transistor product line, engineered specifically for space-constrained digital interface applications requiring guaranteed bias stability, low thermal resistance, and simplified PCB layout in automated SMT environments.

FAQ

What is the maximum operating frequency for DEMD48-7 in switching applications?

DEMD48-7 is characterized for DC and low-frequency switching only. Its specified collector capacitance (2.5pF for Q1, 3.0pF for Q2) and lack of f_T or switching time data in the datasheet indicate suitability up to 1MHz. For higher-frequency use, discrete transistors with published f_T ≥ 100MHz are recommended.

Can DEMD48-7 replace two separate SOT-23 pre-biased transistors in existing designs?

Yes - the SOT-563 footprint matches industry-standard dual-transistor land patterns. Pin 1–2 serve Q1 (NPN) and Pins 3–4 serve Q2 (PNP), with dedicated base inputs on Pins 5 and 6. Layout adaptation requires no netlist change if original design used discrete SOT-23 devices with same pinout orientation.

Does DEMD48-7 support 5V logic input levels directly?

Yes. Q1's VI(on) is 3.0V (min) at I_O=2mA, and Q2's VI(on) is -1.1V (max) at I_O=-5mA, allowing direct interface with 5V TTL and CMOS outputs. No series resistor is needed for logic-level drive, though current limiting remains necessary for loads exceeding 100mA.

Is DEMD48-7 qualified for automotive applications per AEC-Q101?

No - DEMD48-7 is not AEC-Q101 qualified. While it operates from -55°C to +150°C and meets JESD22-A108 thermal cycling, Diodes Incorporated does not list it in their AEC-Q101 certified portfolio. For automotive use, consider the pin-compatible AEC-Q101 qualified EMD48T2R variant.