Diodes Incorporated ZLNB2015JA16TC

Overview

ZLNB2015JA16TC from Diodes Incorporated is a dual-channel satellite LNB voltage and tone detector IC designed for polarization (14.25 V threshold) and 22 kHz band-select control in universal twin/quad LNBs. It delivers true/inverted logic outputs (HOR/BHOR, TD/BTD, ENA), operates from 3–8 V, draws only 2 mA quiescent current, and integrates interference-tolerant tone detection without external filtering - enabling compact, low-cost satellite distribution systems.

For engineers reviewing the ZLNB2015JA16TC datasheet, ZLNB2015JA16TC pinout, ZLNB2015JA16TC application in LNB power switching or ZLNB2015JA16TC equivalent for DiSEqC-compatible satellite front-ends, this device provides verified dual-channel voltage discrimination, tone detection with user-adjustable gain/bandwidth, and "no receiver" detect functionality critical for multi-STB cable matching and power management.

Technical Context

The ZLNB2015JA16TC implements two fully independent channels, each with a temperature-compensated 14.0–14.5 V polarization voltage detector and a dedicated 22 kHz tone detector featuring internal high-frequency cutoff (>100 kHz) and external RC-controlled gain/bandwidth. Each channel drives complementary logic outputs (HOR/BHOR, TD/BTD, ENA) compatible with TTL/CMOS and MIMIC multiplexers.

Its "no receiver" detection uses a secondary 7.5–8.5 V ENA threshold to assert low on VPOL inputs below 8 V, enabling automatic downfeed disable during STB power-down. Input current remains stable at 32–53 µA per VPOL pin (at 15 V), allowing ESD protection with single 6.8 kΩ resistors - eliminating need for discrete transient suppression networks.

Key Specifications

Pinout & Package

Package: 3 mm × 3 mm, 16-pin QFN (QFN1633), exposed thermal pad, 0.5 mm pitch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel LNB control applications.

Compared with MAX2180AETX+ and ZLNB2016JA16TC, the ZLNB2015JA16TC offers lowest quiescent current (2 mA), true dual-channel independence without inter-channel timing constraints, and zero-external-filter tone detection - making it optimal for cost-sensitive, space-constrained twin-LNB implementations where DiSEqC™ command parsing is unnecessary.

Availability

ZLNB2015JA16TC is available at Aetrix Electronics and suitable for satellite distribution systems, twin/quad LNB modules, and DiSEqC™-compatible multi-switches requiring stable component supply, precise 14.25 V polarization control, and robust 22 kHz tone detection.

Supply support for ZLNB2015JA16TC 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.

The ZLNB2015 belongs to Diodes' satellite LNB support product line, engineered specifically for high-reliability, low-cost voltage- and tone-controlled LNBs used in consumer and professional DBS reception systems.

FAQ

What is the function of the ENA1/ENA2 outputs?

The ENA1 and ENA2 outputs assert low when their corresponding VPOL input falls below 7.5 V, signaling absence of an active satellite receiver. This enables automatic disabling of the associated LNB downfeed driver to prevent signal reflections and cable mismatch issues - a critical feature for multi-STB installations where receivers may be powered off independently.

Can ZLNB2015JA16TC operate directly from the LNB's 13/18 V supply rail?

No - the ZLNB2015JA16TC requires a separate 3–8 V DC supply (VCC). Its VPOL1/VPOL2 inputs accept the 13/18 V LNB supply via 6.8 kΩ series resistors for ESD protection and threshold sensing, but the IC itself is not rated for direct 13/18 V operation and must be powered from a regulated low-voltage rail.

How does the ZLNB2015JA16TC achieve 22 kHz tone detection without external filters?

It integrates a dedicated tone detection path per channel comprising a programmable-gain amplifier, internal band-pass filter (cutoff >100 kHz), precision rectifier/smoothing stage, and comparator. External RC components set gain and lower frequency limit only; the high-frequency rejection and detection logic are fully internal - eliminating need for discrete LC or ceramic filters.

Are unused outputs required to be terminated?

No - any unused outputs (HOR, BHOR, TD, BTD, ENA) can be left open-circuited without affecting device operation or stability. The outputs are CMOS/TTL-compatible push-pull drivers with defined high/low states under all valid input conditions, and no pull-up/down resistors are needed unless interfacing with non-standard loads.