LM567H/B - General-Purpose Tone Decoder | Rochester Electronics
MPN: LM567H/B ✓ ActiveLM567H/B Overview
A tone decoder is a specialized phase-locked-loop signal-processing circuit. In the LM567 and LM567C family, the oscillator establishes the internal reference frequency, the quadrature detectors evaluate the incoming waveform, and the loop locks when the input is within the selected passband. The output transistor provides a grounded switch indication rather than a precision analog output, making the LM567H/B suitable for tone detection, signaling, remote control, communications, and industrial control functions.
The verified manufacturer-linked description identifies externally adjustable center-frequency and bandwidth networks as central implementation features. Those networks allow one decoder circuit to target different operating frequencies without changing the integrated circuit. Designers must still determine the exact package dimensions, pin numbering, electrical limits, temperature range, and timing limits from the manufacturer datasheet before releasing a PCB or production design because those values are not present in the supplied verification excerpts.
Typical uses include detecting an audio-frequency command tone, acknowledging a transmitted carrier, recognizing a legacy signaling frequency, or providing a hardware threshold in a control system. The transistor output can drive a downstream stage only after its current, voltage, and timing capabilities are confirmed from the datasheet. A system designer should also verify startup behavior, capture bandwidth, frequency tolerance, and supply-voltage requirements for the exact LM567H/B ordering code.
Because this Rochester Electronics order code includes a /B commercial suffix and is offered in bulk packaging, procurement should confirm lifecycle status, stock, lot traceability, and equivalent original-order codes before committing to a volume build. The verified distributor listings indicate in-stock status or market availability, but quantity-dependent pricing beyond the listed starting price is not supplied. This page distinguishes directly verified facts from parameters that require manufacturer documentation, avoiding unsupported claims while preserving useful design context for engineers.
Drop-in alternatives for LM567H/B — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
No drop-in alternatives available for this product.
Request AlternativesLM567H/B Specifications
| Product Type | General-purpose tone decoder |
| Detection Architecture | I and Q detector with voltage-controlled oscillator |
| Output Type | Saturated transistor switch to ground |
| Center Frequency | Externally adjustable |
| Detection Bandwidth | Externally adjustable |
| Packaging Type | Bulk |
| Quantity per Package | 1 unit |
| Moisture Sensitivity Level | 3 (168 hours) |
| RoHS Status | unknown |
| REACH Status | Vendor undefined |
| Leading Price | $34.9026 as of 2026-10-28 |
LM567H/B 1 unit Pin Configuration Guide
Pin configuration for LM567H/B (1 unit package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for LM567H/B.
Refer to the datasheet for full pin configuration.
Typical Applications
LM567H/B is suitable for 6 applications: Audio-Frequency Command Detection, Remote Control Tone Receiver, Industrial Tone Signaling Interface, Telecom Tone Acknowledgment, Legacy Instrumentation Trigger, Security and Alarm Tone Recognition.
Audio-Frequency Command Detection
The LM567H/B suits legacy audio-frequency command detection because it provides a saturated transistor indication when the input enters the decoder passband. The verified manufacturer-linked description confirms an adjustable center frequency and bandwidth, allowing external timing components to establish the target tone. In a receiver, the transistor output can provide a hardware decision for a downstream latch or controller. Designers must select the frequency-setting network from the datasheet formulas and verify supply, output-current, and temperature limits because those values are not present in the supplied excerpts.
Recommended
Remote Control Tone Receiver
The LM567H/B can implement a compact remote-control tone receiver because the integrated I and Q detectors and voltage-controlled oscillator compare the incoming signal against an externally established passband. Its transistor output provides a simple assertion signal for a microcontroller or logic gate rather than an analog measurement. Practical implementation requires filtering the receiver input and choosing the center-frequency components carefully, because excessive timing tolerance can move the tone outside the capture range. The exact package pins and electrical limits must be confirmed before layout.
Recommended
Industrial Tone Signaling Interface
The LM567H/B is applicable to industrial tone-signaling systems that need a hardware indication of a selected communication or control tone. The adjustable detection bandwidth can distinguish the intended frequency from nearby noise, while the grounded transistor output can represent a detected event. In an industrial interface, the output must be checked against the output-current rating and supply level of the downstream controller. Galvanic isolation, surge protection, and environmental qualification are outside the verified data and should be designed separately.
Recommended
Telecom Tone Acknowledgment
The LM567H/B can support telecom equipment that recognizes a legacy in-band signaling tone and must return a simple acknowledgment. Its phase-detection architecture and externally adjustable passband make it suitable for fixed-frequency detection rather than general-purpose frequency measurement. The circuit should include input limiting and bandwidth filtering appropriate to the communications line. Before implementation, verify the decoder's supply range, maximum input frequency, output timing, and package pinout from the manufacturer datasheet.
Recommended
Legacy Instrumentation Trigger
The LM567H/B can trigger an event in legacy test or measurement equipment when a known calibration tone appears. The saturated transistor output provides an edge or level that can be captured by a timing circuit or control system, while the adjustable bandwidth separates the calibration tone from adjacent noise. A production design should validate oscillator accuracy and capture behavior over the full required temperature range. Because the verified excerpts do not specify drift, temperature limits, or supply requirements, these values must remain design-verification items.
Recommended
Security and Alarm Tone Recognition
The LM567H/B can support a simple alarm or security system that distinguishes a configured tone from ambient audio. The adjustable center frequency and bandwidth let the designer target a selected signal, and the transistor output offers a hardware event indication. Input conditioning and filtering remain essential because the verified data describes frequency detection rather than speech recognition or spectral analysis. Deployment also requires environmental testing, false-accept probability analysis, and verification of the decoder's behavior at supply and temperature extremes.
Recommended
Recommended Products Summary
Engineering reference data for LM567H/B — comparison, design guidance, and compliance information.
Selection Guide
Design Notes
Verify the LM567H/B supply-voltage range, quiescent current, and output sink-current limit from the manufacturer datasheet before assigning power or logic rails. The supplied excerpts establish decoder operation but do not provide these electrical limits. Decouple the supply close to the device with capacitance selected from the datasheet's recommended network, and ensure any downstream load remains within the saturated transistor output rating.
Keep the oscillator and detector timing components close to their specified package pins, but first confirm the actual LM567H/B footprint and pin numbering. Use a common ground reference between the external timing network, signal input, and supply-decoupling capacitors. Do not substitute a generic DIP-8 LM567 layout until the Rochester Electronics package drawing and numbered pinout have been checked against the manufacturer datasheet.
Do not infer a drop-in replacement from functional similarity alone. NJM567 is described as having a similar schematic, and TI describes the LMC567 as functionally similar to the LM567, but neither source verifies identical package pins, supply limits, frequency performance, or output ratings for LM567H/B. Validate any substitute against the original manufacturer datasheet and test oscillator lock, capture bandwidth, detection polarity, and saturation behavior on the target board.
Compliance Information
The verified GlobalSpec excerpt states REACH Status: Vendor Undefined. No verified RoHS, lead-free, halogen-free, conflict-minerals, or automotive-qualification statement is provided, so those fields remain unknown.
