Diodes Incorporated DZT5551Q-13

Overview

DZT5551Q-13 from Diodes Incorporated is a 160V NPN bipolar junction transistor (BJT) in SOT223 package, rated for 600mA continuous collector current, 180V collector-base breakdown voltage, and qualified to AEC-Q101 for automotive reliability. It delivers low saturation voltage (≤150mV at 10mA/1mA drive) and high DC current gain (h_FE = 80–250 at I_C = 1–50mA), enabling robust high-voltage switching in engine control modules.

For engineers reviewing the DZT5551Q-13 datasheet, DZT5551Q-13 pinout, DZT5551Q-13 application, or DZT5551Q-13 equivalent, key selection criteria include V_CEO ≥160V, I_C ≥600mA, AEC-Q101 qualification, SOT223 thermal performance (R_θJA = 62.5°C/W), and complementary pairing with DZT5401 PNP.

Technical Context

This NPN BJT operates as a high-voltage linear amplifier or saturated switch in automotive power management circuits. Its BV_CEO = 160V and BV_CBO = 180V support operation across 12V/24V/48V systems with transient margin, while h_FE stability up to 50mA ensures predictable gain in feedback-controlled drivers.

The device uses a planar epitaxial structure with fully lead-free, halogen- and antimony-free "Green" molding compound (UL 94V-0). Thermal resistance from junction to leads is 34.05°C/W, enabling 2W dissipation on a 50mm × 50mm × 1.6mm FR-4 PCB with 1oz copper - critical for under-hood temperature resilience.

Key Specifications

Pinout & Package

Package: SOT223 - surface-mount plastic package with exposed collector tab for enhanced thermal conduction and mechanical anchoring. Dimensions: 6.50 × 3.50 × 1.60 mm (L × W × H), weight ≈ 0.112 g.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage NPN transistor applications.

Compared with ZTX653 and MJD112, DZT5551Q-13 uniquely combines AEC-Q101 qualification, 160V V_CEO, SOT223 thermal efficiency, and 4kV ESD immunity - making it the only drop-in solution for safety-critical 48V automotive switching where voltage margin and reliability are non-negotiable.

Availability

DZT5551Q-13 is available at Aetrix Electronics and suitable for engine control units, adaptive LED lighting systems, body control modules, and electric power steering subsystems requiring stable component supply across automotive production lifecycles.

Supply support for DZT5551Q-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, specializing in high-reliability components for automotive, industrial, and computing markets since 1960.

The DZT5551Q belongs to Diodes' AEC-Q101-qualified high-voltage BJT product line, engineered specifically for automotive power switching applications demanding extended voltage margin, thermal resilience, and zero-defect manufacturing traceability.

FAQ

Is DZT5551Q-13 pin-compatible with standard SOT223 NPN transistors?

Yes - DZT5551Q-13 uses the industry-standard SOT223 pinout: Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector, and Pin 4 = Collector Tab. This matches JEDEC MO-178AB and enables direct replacement in existing SOT223 layouts without redesign, provided thermal and voltage margins are verified.

What is the maximum allowable junction temperature during continuous operation?

The absolute maximum junction temperature is +150°C, and the device is rated for continuous operation up to this limit when ambient temperature and PCB copper area meet the derating curve in DS38496 Rev. 1–2. At T_A = 100°C, maximum power dissipation is reduced to 1.0W based on R_θJA = 62.5°C/W.

Does DZT5551Q-13 require a base resistor in all applications?

Yes - a series base resistor is mandatory to limit I_B and ensure saturation without exceeding the base-emitter junction's 6V reverse rating or forward current capability. For I_C = 600mA and h_FE = 80, minimum I_B = 7.5mA; with V_BE(sat) ≈ 0.85V and 3.3V GPIO drive, R_B ≈ 330Ω is typical.

Can DZT5551Q-13 be used in linear amplifier configurations?

Yes - its f_T = 100–300MHz and h_fe = 50–260 at 10mA support small-signal amplification up to ~10MHz. However, the SOT223 package's thermal limitations (2W max) restrict sustained linear operation to low-power stages; it is optimized for switching, not Class-A amplification.