Diodes Incorporated 2DB1188Q-13

Overview

2DB1188Q-13 from Diodes Incorporated is a 32V PNP medium-power transistor in SOT89 package, rated for -2A continuous collector current, with V_CE(sat) ≤ -350mV at -2A/-0.2A and h_FE = 120–270 (V_CE = -3V, I_C = -0.5A), used in automotive load switching and industrial DC-DC converter bias circuits.

For engineers reviewing the 2DB1188Q-13 datasheet, 2DB1188Q-13 pinout, 2DB1188Q-13 application, or 2DB1188Q-13 equivalent, key selection criteria include verified PNP saturation voltage under high-current drive, thermal resistance to leads (R_θJL = 19°C/W), junction-to-ambient derating on 15mm×15mm 1oz copper, and AEC-Q101 readiness for automotive-grade reliability validation.

Technical Context

This PNP bipolar junction transistor operates in linear and saturated switching modes, with BV_CEO = -32V and VEBO = -6V enabling robust reverse-bias margin in emitter-follower and high-side switch configurations. Its f_T = 120MHz supports moderate-speed switching up to ~100kHz in power control stages.

Thermal design is anchored by R_θJL = 19°C/W (junction-to-leads) and R_θJA = 125°C/W (on 15mm×15mm FR4, 1oz Cu), requiring exposed pad soldering for sustained -2A operation. Safe operating area (SOA) is limited by second breakdown at V_CE > -15V under pulsed I_C > -1.5A.

Key Specifications

Pinout & Package

Package: SOT89 - Surface-mount plastic package with exposed collector pad for thermal dissipation; dimensions per JEDEC MO-219AB (D2 = 1.71 mm, E = 2.50 mm, L = 1.05 mm).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MJD127-13 and ZTX951, the 2DB1188Q-13 uniquely balances -32V blocking, -2A current, SOT89 thermal efficiency (R_θJL = 19°C/W), and automotive-ready manufacturing-making it optimal for space-constrained, thermally demanding 12V/24V industrial and automotive switches.

Availability

2DB1188Q-13 is available at Aetrix Electronics and suitable for automotive body control modules, industrial DC-DC converter bias supplies, and consumer appliance motor driver stages requiring stable component supply and AEC-Q101-aligned manufacturing traceability.

Supply support for 2DB1188Q-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, manufacturing, and sales operations across Asia, Europe, and the Americas.

The 2DB1188Q-13 belongs to Diodes' medium-power bipolar transistor product line, engineered for high-reliability switching and linear regulation in automotive, industrial, and consumer power systems where thermal efficiency and process consistency are critical.

FAQ

What is the maximum safe operating temperature for 2DB1188Q-13?

The device has an operating junction temperature range of -55°C to +150°C. At ambient temperatures above +85°C, power dissipation must be derated linearly from 1W at +25°C using the 125°C/W R_θJA value on standard FR4. Full -2A current is only sustainable below +70°C ambient with proper copper thermal relief.

Is 2DB1188Q-13 qualified to AEC-Q101?

2DB1188Q-13 is manufactured in IATF 16949-certified facilities and supports PPAP documentation. While not pre-certified as a standalone AEC-Q101 part, Diodes confirms it meets AEC-Q101 stress test requirements when processed through their automotive qualification flow-customers must initiate formal qualification with Diodes for specific application validation.

Can 2DB1188Q-13 replace 2DB1188P-13 in new designs?

Yes-2DB1188Q-13 supersedes the obsolete 2DB1188P-13 with identical pinout, package, and absolute maximum ratings, but offers improved h_FE (120–270 vs. 82–180) and tighter V_CE(sat) distribution. No layout or schematic changes are needed; design margins improve due to higher gain and lower saturation voltage.

What is the recommended PCB pad layout for thermal performance?

Use the Diodes-recommended SOT89 pad layout: 1.50mm × 4.53mm collector pad (Y4), 0.77mm × 3.03mm emitter pad (Y1), and 0.58mm × 0.244mm base pad (X). Connect the collector pad to ≥15mm² internal or external copper pour with ≥4 thermal vias (0.3mm diameter) to inner ground planes for optimal R_θJL performance.