Diodes Incorporated DCX51-13

Overview

DCX51-13 from Diodes Incorporated is a PNP epitaxial planar silicon transistor in SOT89-3L package, rated for -45 V V_CEO, -1 A continuous collector current, and 1 W power dissipation at 25°C ambient. It delivers h_FE = 100–250 at I_C = -150 mA, V_CE = -2 V, and exhibits V_CE(SAT) ≤ -0.5 V at I_C = -500 mA / I_B = -50 mA - suited for medium-power switching in DC-DC converter bias circuits.

For engineers reviewing the DCX51-13 datasheet, DCX51-13 pinout, DCX51-13 application, or DCX51-13 equivalent, key selection criteria include verified PNP polarity, SOT89-3L thermal performance (R_θJA = 125°C/W), guaranteed h_FE range, V_CEO/V_CBO breakdown limits, and RoHS-compliant matte tin plating on copper leadframe.

Technical Context

This discrete PNP bipolar junction transistor operates in active or saturation mode for linear amplification or hard-switching functions. Its epitaxial planar die construction ensures stable gain and low leakage, with V_(BR)EBO = -5 V and I_EBO ≤ -100 nA confirming robust emitter-base junction integrity under reverse bias.

The device's f_T = 200 MHz at I_C = -50 mA enables use in low-to-moderate frequency signal switching, while C_obo = 25 pF at V_CB = -10 V supports predictable high-frequency output impedance behavior in driver stages.

Key Specifications

Pinout & Package

Package: SOT89-3L - surface-mount plastic case with exposed collector tab for thermal conduction; dimensions: 4.50 × 2.50 × 1.05 mm (L × E × L); UL 94V-0 rated molding compound; moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP medium-power switching applications.

Compared with ZTX653 and MMBT4403, DCX51-13 uniquely balances 1 A current rating, 1 W power dissipation in SOT89-3L, and guaranteed h_FE ≥ 100 - making it optimal for thermally constrained medium-power PNP switching where both current and voltage headroom matter.

Availability

DCX51-13 is available at Aetrix Electronics and suitable for DC-DC converter bias circuits, industrial 4–20 mA sensor interfaces, and LED pre-regulator modules requiring stable component supply with consistent parametric performance across production lots.

Supply support for DCX51-13 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 and manufacturing operations across Asia and the Americas.

The DCX51-13 belongs to Diodes' general-purpose bipolar transistor product line, engineered specifically for cost-sensitive, medium-power linear and switching applications in industrial and consumer power systems.

FAQ

What is the maximum allowable junction temperature for DCX51-13?

The DCX51-13 has an absolute maximum junction temperature (T_j) of +150°C, as specified in its thermal characteristics table. Operation above this limit risks permanent degradation of the epitaxial base-collector junction. Derating is required above 25°C ambient per Fig. 1 - e.g., max power drops to ~0.5 W at T_A = 85°C.

Is DCX51-13 pin-compatible with DCX51-16?

Yes - DCX51-13 and DCX51-16 share identical SOT89-3L package, pinout (Emitter/Base/Collector on pins 1/2/3), and electrical specifications. The "-13" and "-16" suffixes denote tape-and-reel packaging variants (2500/reel vs. 10000/reel), not functional differences.

Does DCX51-13 require a heatsink in 1 W operation?

No external heatsink is required if mounted per Diodes' AP02001 recommended pad layout (≥100 mm² copper pour under collector tab). At 1 W and 25°C ambient, junction temperature rises by 125°C - reaching 150°C. For reliability, operate ≤0.8 W continuously or ensure ambient stays ≤20°C.

Can DCX51-13 replace BC807 in SOT23 designs?

No - DCX51-13 uses SOT89-3L (larger, thermally enhanced), while BC807 uses SOT23. Pinout differs (SOT23: E-B-C vs. SOT89: E-B-C but physically incompatible), and DCX51-13's higher I_C/P_D ratings necessitate PCB layout changes. Direct replacement requires redesigning footprint and thermal relief.