STMicroelectronics LNBP9K7-R

Overview

LNBP9K7-R from STMicroelectronics is a monolithic linear LNB supply and control voltage regulator in SPAK-7L (PowerFlex™) through-hole package, delivering 13 V or 18 V output (typ.) with 500 mA guaranteed current, integrated 22 kHz tone oscillator, fast DiSEqC™-compatible tone start-up, and dual-input supply selection (VCC1/VCC2) for thermal optimization in satellite receiver front-ends.

For engineers reviewing the LNBP9K7-R datasheet, LNBP9K7-R pinout, LNBP9K7-R application, or LNBP9K7-R equivalent, key selection criteria include output voltage logic control (VSEL), 22 kHz tone activation (TONE), standby management (ENABLE), dual-supply voltage routing, and thermal protection behavior under sustained 500 mA load.

Technical Context

The LNBP9K7-R implements a dual-input linear regulator architecture where internal switching automatically selects VCC1 (15–25 V) for 13 V output mode or VCC2 (22–25 V) for 18 V output mode to minimize power dissipation. Its integrated 22 kHz oscillator is factory-trimmed (±2 kHz) and activated via TTL-compatible TONE pin.

DiSEqC™ burst encoding is enabled by sub-15 µs tone rise/fall times and immediate oscillator start-up upon TONE assertion. Logic inputs (VSEL, ENABLE, TONE) operate at standard CMOS thresholds (VIL = 0.8 V, VIH = 2.5 V) with <20 µA input current, supporting direct microcontroller interfacing without level-shifting.

Key Specifications

Pinout & Package

LNBP9K7-R is housed in the SPAK-7L PowerFlex™ through-hole package - a 7-pin, single-row, gull-wing leadframe with integrated heatsink pad, optimized for PCB-mounted thermal dissipation in satellite receiver power stages.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LNBP9K7 and LNBP9D, the LNBP9K7-R offers superior thermal performance (2 °C/W junction-to-case) and mechanical reliability via its PowerFlex™ through-hole construction - critical for high-temperature, high-vibration satellite receiver deployments where long-term solder joint integrity matters.

Availability

LNBP9K7-R is available at Aetrix Electronics and suitable for Direct Broadcast Satellite (DBS) receivers, digital satellite TV set-top boxes, and professional IF distribution systems requiring stable component supply, consistent thermal behavior, and long-lifecycle availability.

Supply support for LNBP9K7-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 analog, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.

The LNBP series belongs to ST's dedicated satellite interface product line, engineered specifically to integrate LNB power regulation, voltage selection, and DiSEqC™ tone generation into a single monolithic device for cost-sensitive, high-reliability broadcast reception systems.

FAQ

Can LNBP9K7-R operate from a single 23 V supply?

Yes - the datasheet confirms that both VCC1 and VCC2 may be powered from the same 23 V source without degrading regulation accuracy, output current capability, or protection features. An input resistor (~12–15 Ω) is recommended only to reduce power dissipation during 13 V output mode; omission increases thermal load but maintains functionality.

What is the maximum allowable junction temperature before thermal shutdown?

The LNBP9K7-R triggers thermal shutdown at 150 °C junction temperature, as specified in Table 3 (Maximum Ratings). Recovery occurs automatically once the junction cools below the hysteresis threshold (~140 °C), and no latch-up or damage occurs under repeated thermal cycling within absolute maximum ratings.

Is external filtering required on the TONE pin?

No - the TONE pin is a logic-level enable input, not an analog modulation node. It accepts standard TTL/CMOS HIGH/LOW signals (0.8 V/2.5 V thresholds) and draws <20 µA. No RC filtering, bypassing, or impedance matching is needed; direct connection to MCU GPIO suffices for DiSEqC™ burst control.

Does LNBP9K7-R support polarity switching for LNBs?

Yes - polarity selection is implemented via the VSEL pin: logic LOW configures 13 V output (typically for vertical polarization), and logic HIGH configures 18 V output (typically for horizontal polarization), per ETSI EN 50494 standard. This voltage-level signaling directly controls LNB internal H/V switch matrices.