Infineon Technologies PBL38620/2SHA

Overview

PBL38620/2SHA 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 feed, hybrid functionality, programmable overhead voltage (POV), analog temperature guard, ring relay drive, and ground key detection in a P-/PG-SSOP-24-1 package. Key confirmed specs: 44 V open-loop voltage at −48 V battery feed, 60 mW on-hook power dissipation, selectable 1× or 0.5× transmit gain, and no required power-up sequence.

For engineers reviewing the PBL38620/2SHA datasheet, PBL38620/2SHA pinout, PBL38620/2SHA application, or PBL38620/2SHA equivalent, this page delivers verified electrical characteristics, SLIC operating state mapping, thermal resistance (50.3 °C/W), resistor/capacitor design values (e.g., RR = 1.2 kΩ, CHP = 10 µF), and functional context for telephony interface design.

Technical Context

The PBL38620/2SHA implements a fully integrated SLIC with dual-mode battery feed (high/low Vbat switching), analog-based longitudinal current control during on-hook, and programmable signal headroom via POV. Its hybrid function supports two-wire to four-wire conversion with configurable gain (−3 dB or 0 dB) and balanced impedance matching (BLME/BLFE/BFLE).

Loop monitoring includes dedicated analog comparators for ground key, ring trip, and loop current detection-each with defined thresholds and hysteresis. The integrated ring relay driver delivers 100 mA sink capability with overtemperature-limited operation, enabling direct connection to mechanical relays without external buffering.

Key Specifications

Pinout & Package

Package: P-/PG-SSOP-24-1 (Plastic Shrink Small Outline Package), 24-pin, 0.635 mm pitch, exposed thermal pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PBL38620/2SHA, Si3217x adds power conversion at the cost of pin compatibility and design simplicity, while LE89316 trades configurability for thermal efficiency and maturity in volume production environments.

Availability

PBL38620/2SHA is available at Aetrix Electronics and suitable for Central Office Line Cards, PABX Interfaces, and Terminal Adapters requiring stable component supply, long-term lifecycle support, and verified SLIC performance under ETSI/GR-909 line conditions.

Supply support for PBL38620/2SHA 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 infrastructure.

The FlexiSLIC™ product line targets wireline telephony infrastructure, delivering highly configurable, thermally robust SLICs optimized for CO, PABX, and CPE equipment where analog line interface reliability and regulatory compliance are critical.

FAQ

What is the maximum loop length supported by PBL38620/2SHA?

The PBL38620/2SHA supports loop lengths up to 12 km with 0.5 mm copper wire under standard −48 V battery feed, based on its 44 V open-loop voltage, 20 mA minimum loop current, and longitudinal balance performance per ITU-T G.991.1. This assumes typical line capacitance (≤ 0.18 µF/km) and no bridged taps.

Does PBL38620/2SHA require external clocking or timing references?

No. The PBL38620/2SHA operates autonomously without external clocks or timing references. Its internal analog circuitry handles all SLIC functions-including hybrid balancing, gain control, and loop monitoring-using only DC supplies and passive components (resistors, capacitors) as specified in Tables 5–7 of the Rev. 2.0 datasheet.

Can PBL38620/2SHA drive a mechanical ring relay directly?

Yes. The integrated RELAY pin provides 100 mA sink current capability with built-in overtemperature foldback, allowing direct connection to standard 48 V, 100 mA-rated electromechanical ring relays. No external transistor or driver stage is required, as confirmed in Section 8 and Figure 10 of the datasheet.

How is programmable overhead voltage (POV) configured on PBL38620/2SHA?

POV is set using external resistors connected to pins RTX and RRX, with values defined in Table 6 (RRX = 10 kΩ, RTX = 100 kΩ for ±1.5 V range). The internal analog circuitry interprets the resistor divider ratio to adjust DC headroom on VTXO and VTRX paths, enabling precise control of signal swing margins without digital registers.