onsemi PZT3906T1G

Overview

PZT3906T1G from onsemi is a PNP silicon general-purpose transistor in SOT-223 package, rated for −40 V V_CEO, −200 mA I_C, and 1.5 W power dissipation at T_A = 25°C. It delivers DC current gain (h_FE) of 60–300 across 0.1–100 mA collector current, with V_CE(sat) ≤ −0.4 V at −50 mA/−5 mA drive, suitable for low-voltage switching and linear amplification in industrial control interfaces.

For engineers reviewing the PZT3906T1G datasheet, pinout, applications, or equivalent options, key selection considerations include its −40 V breakdown rating, SOT-223 thermal performance (R_JA = 83.3°C/W), f_T = 250 MHz small-signal bandwidth, and RoHS-compliant Pb-free construction.

Technical Context

The PZT3906T1G operates as a medium-power PNP bipolar junction transistor optimized for switching and analog amplification in DC-coupled circuits. Its design supports stable h_FE over −55°C to +150°C junction temperature range and exhibits low noise figure (NF ≤ 4.0 dB) at 1 kHz with 100 μA collector current.

Thermal management is enabled by the SOT-223 package's dual-collector leads (pins 2 and 4) and 35°C/W R_JL to lead, allowing higher continuous current than standard SOT-23 equivalents. Switching performance includes t_d/t_r ≤ 35 ns and t_s ≤ 225 ns under −10 mA load with −1 mA base drive.

Key Specifications

Pinout & Package

SOT-223 (Case 318E) surface-mount package with exposed thermal pad connected to collector (pins 2 and 4). Dual collector terminals improve current handling and thermal path to PCB copper.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP general-purpose transistor applications.

Compared with MMBT3906LT1G and ZTX653, the PZT3906T1G offers optimal balance of thermal capability (SOT-223 R_JA = 83.3°C/W), RoHS compliance, and proven 200 mA switching-making it preferred for volume industrial PCBs where reliability and manufacturability are prioritized over ultra-compact footprint or extreme voltage rating.

Availability

PZT3906T1G is available at Aetrix Electronics and suitable for industrial power sequencing, LED driver switches, audio preamplifier stages, and relay driver interfaces requiring stable component supply and long-term production continuity.

Supply support for PZT3906T1G 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.

The PZT3906T1G belongs to onsemi's general-purpose bipolar transistor product line, designed for cost-sensitive, high-reliability discrete switching and amplification in industrial control, power management, and signal conditioning applications.

FAQ

What is the maximum continuous collector current rating for the PZT3906T1G?

The PZT3906T1G has a maximum continuous collector current (I_C) rating of −200 mA at T_A = 25°C. This rating assumes proper PCB thermal design with ≥713 mm² of 1 oz copper per the datasheet's thermal characterization note. At elevated ambient temperatures or reduced copper area, derating is required per the R_JA = 83.3°C/W specification. The PZT3906T1G maintains safe operation up to this limit when V_CE remains within its −40 V breakdown rating.

Does the PZT3906T1G support high-frequency signal amplification?

Yes, the PZT3906T1G supports high-frequency signal amplification with a current-gain bandwidth product (f_T) of 250 MHz at I_C = −10 mA and V_CE = −20 V. This makes it suitable for audio-frequency amplification and low-MHz small-signal applications. However, its h_FE drops to 30 at I_C = −100 mA, so optimal small-signal gain occurs below 50 mA collector current. The PZT3906T1G's C_ibo = 10 pF and C_obo = 4.5 pF further support stable operation in tuned circuits up to ~100 MHz.

How does the dual-collector configuration of the PZT3906T1G improve thermal performance?

The PZT3906T1G uses pins 2 and 4 as electrically connected collectors, forming a dual-terminal thermal path that lowers effective thermal resistance. With R_JL = 35°C/W to lead and R_JA = 83.3°C/W to ambient (on FR-4 with 713 mm² copper), this configuration dissipates heat more effectively than single-collector SOT-23 transistors. The PZT3906T1G achieves 1.5 W total dissipation at 25°C-over four times that of the MMBT3906LT1G-enabling higher current operation without forced cooling in industrial PCB layouts.

Is the PZT3906T1G RoHS compliant and halogen free?

Yes, the PZT3906T1G is explicitly certified as Pb-free, halogen free, and BFR free in accordance with EU RoHS Directive 2011/65/EU and related environmental standards. The "G" suffix in the part number denotes RoHS-compliant packaging, and the device carries the onsemi green logo marking. This compliance applies to all materials-including mold compound, lead frame, and internal die attach-without exemptions. The PZT3906T1G meets IPC/JEDEC J-STD-609B Class 1 halogen-free requirements (<900 ppm Cl + Br, <900 ppm total halogens).

What are the key differences between PZT3906T1G and MMBT3906LT1G?

The PZT3906T1G and MMBT3906LT1G share identical electrical specifications at low currents but differ critically in package and thermal capability. The PZT3906T1G uses SOT-223 (1.5 W, R_JA = 83.3°C/W), while the MMBT3906LT1G uses SOT-23 (0.31 W, R_JA = 300°C/W). As a result, the PZT3906T1G sustains −200 mA continuously versus −100 mA for the MMBT3906LT1G. Both are RoHS-compliant, but only the PZT3906T1G supports industrial-grade thermal cycling and high-current relay driving without derating.