Infineon Technologies PBL38620/2QNA

Overview

PBL38620/2QNA from Infineon Technologies is a FlexiSLIC™ Subscriber Line Interface Circuit (SLIC) designed for central office and CPE line-card applications. It provides full two-wire loop interface with programmable overhead voltage (POV), 44 V open-loop voltage at -48 V battery feed, selectable 1× or 0.5× transmit gain, integrated ring relay driver, and analog overtemperature protection enabling continued transmission during thermal guard activation.

For engineers reviewing the PBL38620/2QNA datasheet, PBL38620/2QNA pinout, PBL38620/2QNA application, or PBL38620/2QNA equivalent, key selection criteria include on-hook power dissipation (60 mW), longitudinal current capability in on-hook state, battery feed tracking accuracy, POV programmability, and SLIC/codec interface compatibility per SICOFI®4 reference design.

Technical Context

The PBL38620/2QNA implements a fully integrated SLIC architecture with dual-mode battery feed (high/low Vbat switching), hybrid circuitry supporting two-wire/four-wire conversion, and real-time loop monitoring including ground key and ring trip detection. Its analog temperature guard operates without interrupting signal path integrity.

Control logic uses three-pin state encoding (C3/C2/C1) to select six operating modes: open circuit, ringing, active, test, low-battery active, and low-battery ringing. The device requires no power-up sequencing and supports on-hook transmission via internal bias current control of RSN terminal.

Key Specifications

Pinout & Package

Package: P-/PG-LCC-28-3 (Plastic Leaded Chip Carrier, 28-pin, 0.050" pitch, gull-wing leads).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar SLIC applications.

Compared with LE89316CP and SLIC26010, the PBL38620/2QNA uniquely combines analog thermal guard with on-hook transmission, programmable POV, and dual-battery feed - making it optimal for mixed-infrastructure CO upgrades requiring backward compatibility and uninterrupted service under thermal stress.

Availability

PBL38620/2QNA is available at Aetrix Electronics and suitable for central office line cards, PABX interface modules, and ISDN terminal adapters requiring stable component supply, long-term lifecycle support, and compliance with ITU-T K.20/K.21 surge standards.

Supply support for PBL38620/2QNA 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

Infineon Technologies AG is a German semiconductor manufacturer specializing in power management, automotive, and communications ICs, with global R&D and manufacturing facilities.

The FlexiSLIC product line targets wireline telephony infrastructure, delivering highly integrated, programmable SLIC solutions optimized for CO line cards, PABX systems, and CPE terminal adapters requiring robust loop supervision and battery feed control.

FAQ

What is the maximum loop current supported by PBL38620/2QNA?

The PBL38620/2QNA supports up to 120 mA loop current in active state, verified per Table 2 (SLIC Operating States) and Figure 12 (Battery Feed Characteristics) in Rev. 2.0 datasheet. This rating applies across the full operating temperature range (-40°C to +85°C) and is maintained with close tolerance using internal current sensing and feedback.

Does PBL38620/2QNA require external components for POV programming?

Yes - POV is programmed via an external resistor connected to the RSN pin, with values specified in Table 6 (Resistors) of the datasheet. A 10 kΩ resistor sets POV to 2.5 V; other values scale linearly. No capacitor or additional active components are needed for basic POV configuration.

Can PBL38620/2QNA operate with both -48 V and -24 V battery supplies?

Yes - the device features automatic high/low battery switching, selecting between -48 V and -24 V rails based on internal voltage detection. This behavior is confirmed in Section 1.1 Features and Section 6 Battery Feed, enabling deployment across heterogeneous central office infrastructures without hardware modification.

Is the RELAY pin compatible with standard 12 V electromechanical relays?

Yes - the RELAY pin is an open-drain N-channel driver rated for 12 V supply and 100 mA continuous current, matching standard telecom ring relays. Internal current limiting prevents damage during relay coil inductive kickback, and no external flyback diode is required per Figure 8 and Section 8 Relay Driver.