STMicroelectronics LNBP8K7-R

Overview

LNBP8K7-R from STMicroelectronics is a monolithic linear LNB supply and control voltage regulator in PowerFlex™ SPAK-7L through-hole package, delivering 13 V or 18 V (typ.) output under logic control via VSEL pin, with guaranteed 500 mA output current, dual-input supply (VCC1 ≥15 V, VCC2 ≥22 V) for thermal optimization, and auxiliary analog modulation input (EXTM) for satellite receiver LNB interfacing.

For engineers reviewing the LNBP8K7-R datasheet, LNBP8K7-R pinout, LNBP8K7-R application, or LNBP8K7-R equivalent, this device serves as a dedicated LNB power controller with external 22 kHz tone injection capability, low standby current (300 µA), short-circuit and overtemperature protection, and precise output voltage selection-key for DiSEqC-compliant and multi-standard satellite front-end designs.

Technical Context

The LNBP8K7-R implements a dual-rail linear regulation architecture that automatically selects between VCC1 (15–25 V) and VCC2 (22–25 V) based on VSEL state to minimize power dissipation at 13 V output. Its EXTM pin accepts AC-coupled analog modulation signals (400 mVpp, 10 Hz–40 kHz) with 5 V/V gain, enabling compatibility with proprietary LNB control protocols beyond standard DiSEqC.

Control logic operates at TTL-compatible levels (VIL ≤0.8 V, VIH ≥2.5 V) across ENABLE, VSEL, and EXTM (AC-coupled). Thermal shutdown activates at 150 °C, and junction-to-case thermal resistance is 2 °C/W-enabling reliable operation up to 125 °C ambient when mounted with adequate heatsinking.

Key Specifications

Pinout & Package

Package: SPAK-7L (PowerFlex™), through-hole mount, ECOPACK® lead-free, 7-pin single-row layout with integrated heatsink pad.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LNB supply and control applications.

Compared with LNBP9K7-R, LNBP8K7-R trades built-in tone generation for external modulation flexibility-ideal for non-DiSEqC satellite standards. Unlike MAX232CPE+, it delivers regulated 500 mA LNB power with integrated protection, making it a purpose-built solution rather than a general-purpose IC.

Availability

LNBP8K7-R is available at Aetrix Electronics and suitable for digital satellite receiver tuners, LNB power controller modules, multi-switch DiSEqC hubs, and portable satellite finders requiring stable component supply and long-term obsolescence management.

Supply support for LNBP8K7-R 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing silicon solutions for automotive, industrial, and consumer electronics markets.

The LNBP series belongs to ST's analog power management product line, engineered specifically for satellite TV front-end power delivery-balancing high current capability, thermal resilience, and protocol-flexible control in cost-sensitive consumer tuner applications.

FAQ

What is the function of the EXTM pin on LNBP8K7-R?

The EXTM pin is an AC-coupled analog modulation input that accepts external 22 kHz tone signals (up to 400 mVpp, 10 Hz–40 kHz) and superimposes them onto the OUTPUT voltage with 5 V/V gain. It requires a DC-blocking capacitor and enables custom LNB control protocols beyond standard DiSEqC, such as proprietary burst-tone or multi-frequency schemes used in professional satellite equipment.

Can LNBP8K7-R operate from a single 23 V supply?

Yes-both VCC1 and VCC2 pins can be connected to the same 23 V source. ST confirms this configuration is valid and does not degrade performance, though power dissipation increases during 13 V output mode. An input resistor (12–15 Ω) is recommended in single-supply setups to limit thermal stress, but omission is acceptable if heatsinking is sufficient.

How does the dual-supply architecture reduce power dissipation?

When VSEL = LOW (13 V output), the internal switch routes power from VCC1 (15–25 V), minimizing dropout voltage and thus I²R losses. When VSEL = HIGH (18 V output), it switches to VCC2 (22–25 V), maintaining low dropout. This avoids forcing the full 22+ V rail through a single pass element for both output voltages-cutting worst-case dissipation by ~40% versus single-rail alternatives.

Is LNBP8K7-R still in active production?

LNBP8K7-R is marked as "Obsolete Product(s)" in ST's official documentation (Rev. 3, Sep 2006), but Aetrix Electronics maintains legacy inventory with full traceability and extended lifecycle support. We provide verified, tested units with full lot traceability, conforming to original ECOPACK® specifications and electrical characteristics per the final datasheet revision.