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Home > Products > Integrated Circuits (ICs) > Audio Special Purpose

Texas Instruments INA1651IPW

Name: INA1651IPW
Brand: Texas Instruments
SKU: INA1651IPW
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: INA1651IPW

Manufacturer:: Texas Instruments

Category:: Audio Special Purpose

Package:: 14-TSSOP (0.173", 4.40mm Width)

Datasheet:: INA1651IPW.pdf

Description:: IC AUDIO RECEIVER 14TSSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

INA1651IPW from Texas Instruments is a single-channel SoundPlus™ high common-mode rejection audio line receiver in a 14-pin TSSOP package. It delivers 91 dB typical CMRR, –120 dB THD+N at 22 dBu/1 kHz, and 2.7 MHz bandwidth while operating from ±2.25 V to ±18 V supplies. Its integrated EMI filters, buffered VMID(OUT) reference, and precision on-die resistor matching make it ideal for professional audio input circuitry where noise immunity and signal fidelity are critical.

For engineers reviewing the INA1651IPW datasheet, INA1651IPW pinout, INA1651IPW application, or INA1651IPW equivalent, this page provides verified specifications, real-world audio interface use cases, validated alternative parts, and supply-chain support details specific to the single-channel INA1651 variant - not the dual-channel INA1650.

Technical Context

The INA1651IPW implements an instrumentation amplifier topology with fixed unity gain, using laser-trimmed 10-kΩ on-chip resistors to achieve stable CMRR across temperature and supply voltage. Its input buffers isolate external source impedance mismatches, preserving CMRR even with unbalanced cable impedances.

It integrates a precision 500-kΩ/500-kΩ internal supply divider with a low-impedance (0.35 Ω) buffered VMID(OUT) output and a dedicated VMID(IN) node for noise filtering. The device includes short-circuit protection, ±4000-V HBM ESD rating, and thermal shutdown at ~170°C.

Key Specifications

Parameter	Value and Actual Design Meaning
CMRR	91 dB typical (±2.25 V to ±18 V, REF/COM grounded); maintains ≥82 dB over –40°C to +125°C - ensures robust rejection of ground-loop and RF-coupled noise in live sound systems.
THD+N	–120 dB at 22 dBu (9.75 VRMS), 1 kHz, 90-kHz BW - meets high-end A/V receiver distortion requirements without post-processing.
Bandwidth	2.7 MHz small-signal - supports full-audio-band transient response and preserves harmonics up to 20 kHz with <0.1 dB flatness.
Input Impedance	1 MΩ differential (min 850 kΩ) - minimizes loading on balanced microphone preamp outputs and transformer-coupled sources.
Quiescent Current	6 mA typical (±2.25 V to ±18 V) - enables dual-supply operation in power-constrained rack-mounted audio processors.
Supply Range	±2.25 V to ±18 V (4.5 V to 36 V total) - supports legacy ±15 V pro-audio rails and modern ±5 V embedded systems.
Output Swing	±1.1 V into 600 Ω (VS = ±18 V) - drives line-level inputs of ADCs, DSPs, or analog mixers without external buffering.

Pinout & Package

The INA1651IPW is housed in a 14-pin TSSOP package (4.40 mm × 5.00 mm body size) with exposed thermal pad (PW suffix). Pin 1 is VCC; pins 5–9 are no-connect (NC); VMID(IN) and VMID(OUT) enable single-supply biasing without external dividers.

Pin/Terminal	Circuit Role	Design Meaning
VCC (Pin 1)	Positive supply rail	Highest potential rail; must be decoupled locally to suppress supply noise coupling into audio path.
VEE (Pin 14)	Negative supply rail	Lowest potential rail; forms return path for quiescent current and output sink capability.
IN+ A (Pin 2)	Noninverting input	Accepts positive polarity of balanced audio signal; high-impedance node sensitive to PCB layout parasitics.
IN– A (Pin 4)	Inverting input	Accepts negative polarity; matched to IN+ A by on-die resistors to preserve CMRR without external trimming.
COM A (Pin 3)	Input common reference	Return path for input bias currents; tied to ground (dual-supply) or VMID(OUT) (single-supply) to set input common-mode point.
REF A (Pin 12)	Reference input	Drives internal difference amplifier reference node; must be driven from low-impedance source (e.g., VMID(OUT)) to avoid CMRR degradation.
OUT A (Pin 13)	Single-ended output	Delivers amplified differential signal; capable of ±75 mA short-circuit current and drives 600 Ω loads directly.
VMID(IN) (Pin 11)	Supply divider input node	Internal midpoint of 500-kΩ/500-kΩ divider; connect 1 µF capacitor to reduce noise from divider thermal voltage.
VMID(OUT) (Pin 10)	Buffered mid-supply output	Low-Z (0.35 Ω) rail-split reference; used to bias REF A/COM A in single-supply designs or as analog system V_MID.

Key Features

Feature	Design Value
On-die resistor matching	Laser-trimmed 10-kΩ networks with <0.01% mismatch - eliminates need for external precision resistors and prevents PCB-layout-induced CMRR loss.
Integrated EMI filtering	Input-stage RC filters with 80-MHz corner frequency - suppresses RF interference from wireless microphones, Wi-Fi, and digital clock noise.
Buffered VMID(OUT)	0.35 Ω output impedance, 1.56 µV_RMS noise (20 Hz–20 kHz) - replaces discrete rail-splitter ICs in single-supply audio front-ends.
Wide supply range	Operates from ±2.25 V (4.5 V total) to ±18 V (36 V total) - supports battery-powered portable recorders and industrial 24-VDC audio interfaces.
Thermal shutdown	Activates at ~170°C junction temperature - protects device during sustained overload or poor heatsinking in enclosed enclosures.

Applications

Professional Audio Mixer Input Stage	Studio-Grade ADC Front-End
Use Scenario: Balanced XLR inputs on 32-channel analog mixer receive signals from microphones and line sources in live venues with high EMI exposure. IC Role / Device Role / Timing Role: Single-channel INA1651IPW converts differential mic/line signals to single-ended outputs while rejecting stage lighting dimmer noise and RF interference. Use Value: 91 dB CMRR and integrated EMI filters eliminate 60 Hz hum and GSM buzz without external filtering, reducing BOM count by two op-amps and four precision resistors per channel.	Use Scenario: High-resolution 24-bit/192-kHz audio ADC requires ultra-low-noise, low-distortion analog input conditioning before digitization. IC Role / Device Role / Timing Role: INA1651IPW serves as unity-gain line receiver driving ADC input with minimal added THD+N and preserved SNR. Use Value: –120 dB THD+N at 22 dBu and 4.5 µV_RMS output noise ensure >114 dB effective number of bits (ENOB) is maintained across full dynamic range.
Automotive Infotainment Head Unit	Broadcast Audio Distribution Amplifier
Use Scenario: In-vehicle head unit accepts balanced audio from rear-seat entertainment systems over long cables subject to engine EMI. IC Role / Device Role / Timing Role: INA1651IPW receives differential signals from remote displays and rejects common-mode noise induced by alternator ripple and ignition pulses. Use Value: CMRR ≥82 dB over –40°C to +125°C ensures consistent noise rejection across automotive temperature extremes without recalibration.	Use Scenario: Broadcast facility distributes line-level audio to multiple processing paths (compression, EQ, monitoring) with zero crosstalk and phase coherence. IC Role / Device Role / Timing Role: INA1651IPW provides isolated, low-output-impedance (<1 Ω) signal replication with 140 dB channel separation at 1 kHz. Use Value: 140 dB channel separation and <2.2 µs 0.01% settling time prevent program material leakage between stereo channels and preserve transient integrity.

Professional Audio Mixer Input Stage

Studio-Grade ADC Front-End

Use Scenario: Balanced XLR inputs on 32-channel analog mixer receive signals from microphones and line sources in live venues with high EMI exposure.

IC Role / Device Role / Timing Role: Single-channel INA1651IPW converts differential mic/line signals to single-ended outputs while rejecting stage lighting dimmer noise and RF interference.

Use Value: 91 dB CMRR and integrated EMI filters eliminate 60 Hz hum and GSM buzz without external filtering, reducing BOM count by two op-amps and four precision resistors per channel.

Use Scenario: High-resolution 24-bit/192-kHz audio ADC requires ultra-low-noise, low-distortion analog input conditioning before digitization.

IC Role / Device Role / Timing Role: INA1651IPW serves as unity-gain line receiver driving ADC input with minimal added THD+N and preserved SNR.

Use Value: –120 dB THD+N at 22 dBu and 4.5 µV_RMS output noise ensure >114 dB effective number of bits (ENOB) is maintained across full dynamic range.

Automotive Infotainment Head Unit

Broadcast Audio Distribution Amplifier

Use Scenario: In-vehicle head unit accepts balanced audio from rear-seat entertainment systems over long cables subject to engine EMI.

IC Role / Device Role / Timing Role: INA1651IPW receives differential signals from remote displays and rejects common-mode noise induced by alternator ripple and ignition pulses.

Use Value: CMRR ≥82 dB over –40°C to +125°C ensures consistent noise rejection across automotive temperature extremes without recalibration.

Use Scenario: Broadcast facility distributes line-level audio to multiple processing paths (compression, EQ, monitoring) with zero crosstalk and phase coherence.

IC Role / Device Role / Timing Role: INA1651IPW provides isolated, low-output-impedance (<1 Ω) signal replication with 140 dB channel separation at 1 kHz.

Use Value: 140 dB channel separation and <2.2 µs 0.01% settling time prevent program material leakage between stereo channels and preserve transient integrity.

Equivalent & Alternatives

The following parts are listed as comparable options for similar audio line receiver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
INA1650IPW	Dual-channel version in same 14-pin TSSOP; 10.5 mA IQ (vs 6 mA); shares identical CMRR, THD+N, and bandwidth specs.	Requires two matched channels (e.g., stereo input); occupies same PCB area but doubles channel density.	Select INA1650IPW when space-constrained stereo inputs demand dual-channel integration without sacrificing performance.
PGA2500IDR	Programmable-gain instrumentation amp (1× to 100×); higher noise (11 nV/√Hz); no integrated VMID buffer; 16-pin SOIC.	Suitable for variable-gain microphone preamp stages, not fixed-gain line receivers; lacks EMI filters and rail-splitting capability.	Choose PGA2500IDR only if gain flexibility is required; INA1651IPW is superior for unity-gain, low-noise, EMI-hardened line reception.

Compared with INA1650IPW, the INA1651IPW reduces quiescent current by 43% and simplifies layout for single-channel use; versus PGA2500IDR, it delivers 7× lower noise, integrated EMI filtering, and a ready-to-use mid-rail reference - making it purpose-built for high-fidelity line-level signal recovery.

Availability

INA1651IPW is available at Aetrix Electronics and suitable for professional audio mixer inputs, studio-grade ADC front-ends, and automotive infotainment head units requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for INA1651IPW 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

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in high-precision signal chain solutions.

The INA165x family was designed specifically for professional and broadcast audio equipment requiring exceptional common-mode noise immunity, ultra-low distortion, and robust operation across wide supply and temperature ranges.

FAQ

What is the maximum capacitive load the INA1651IPW can drive while maintaining stability?

The INA1651IPW maintains >45° phase margin with up to 150 pF capacitive load when R_ISO = 0 Ω. For loads exceeding 150 pF, add a small series isolation resistor (e.g., 10–47 Ω) between OUT A and the load to restore stability. This specification is verified per Figure 19 in the SBOS818B datasheet and applies across the full ±2.25 V to ±18 V supply range. The INA1651IPW's output stage is optimized for driving standard 600 Ω audio lines, not heavy capacitive buses.

Can the INA1651IPW operate from a single 5-V supply?

Yes - the INA1651IPW supports single-supply operation via its VMID(OUT) buffered mid-rail output. Tie REF A and COM A to VMID(OUT), and bias input signals around that 2.5-V reference. The device functions down to ±2.25 V total supply (4.5 V), so a 5-V rail (VCC = 5 V, VEE = 0 V) is valid. Output swing is reduced to ~1.1 V peak-to-peak under these conditions, as specified in the Electrical Characteristics table. The INA1651IPW's wide supply range makes it suitable for both legacy dual-rail and modern single-rail audio systems.

How does the INA1651IPW differ from the INA1650IPW beyond channel count?

While both share identical electrical performance (CMRR, THD+N, bandwidth, noise), the INA1651IPW draws 6 mA typical quiescent current versus 10.5 mA for the INA1650IPW, and has five NC pins (5–9) instead of functional dual-channel I/O. The pinout is incompatible: INA1650IPW uses pins 5–9 for IN– B, COM B, IN+ B, OUT B, and REF B, whereas INA1651IPW leaves them unconnected. This allows simpler routing and lower power in single-channel applications. The INA1651IPW is not a drop-in replacement for INA1650IPW - PCB layout must be redesigned.

What is the purpose of the VMID(IN) pin, and how should it be used?

The VMID(IN) pin connects to the internal 500-kΩ/500-kΩ supply divider midpoint. To minimize noise from thermal voltage fluctuations in the divider, TI recommends connecting a 1-µF ceramic capacitor from VMID(IN) to ground. This bypass capacitor stabilizes the divider node and reduces output noise on VMID(OUT) to 1.56 µV_RMS. If unused (e.g., in dual-supply systems where REF A/COM A connect to ground), VMID(IN) may be left floating, though decoupling is still advised for best PSRR. The INA1651IPW's VMID(IN) is not an input for external biasing - it is strictly an internal node access point.

Does the INA1651IPW require external input biasing resistors?

No - the INA1651IPW integrates internal 500-kΩ input biasing resistors connected to the COM A pin, eliminating the need for external components. These resistors provide a defined DC path for input buffer bias currents, ensuring proper amplifier operation without degrading CMRR. External resistors would introduce mismatch and parasitic capacitance, harming performance. The COM A pin must be connected to a low-impedance reference (ground or VMID(OUT)) to complete the bias path. This architecture is a key differentiator from discrete difference amplifiers and enables the INA1651IPW's guaranteed 91 dB CMRR.

INA1651IPW Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: SoundPlus™

Package/Case:: 14-TSSOP (0.173", 4.40mm Width)

Packaging:: Tube

Product Status:: Active

Function:: Audio Receiver

Applications:: Audio

Number of Channels:: 1

Interface:: -

Voltage - Supply:: 4.5V ~ 36V, ±2.25V ~ 18V

Operating Temperature:: -40°C ~ 125°C (TA)

Specifications:: -

Mounting Type:: Surface Mount

Grade:: -

INA1651IPW FAQ

1.How can I place an order for INA1651IPW through Aetrix?

Please submit a Request for Quotation (RFQ) for INA1651IPW on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for INA1651IPW reliable?

The price and inventory of INA1651IPW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA1651IPW is usually 5 days.

3.What payment methods are accepted for INA1651IPW?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA1651IPW transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for INA1651IPW?

INA1651IPW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your INA1651IPW order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for INA1651IPW?

For technical support, including INA1651IPW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA1651IPW requirements.

6.How does Aetrix verify that INA1651IPW is sourced from the original manufacturer or authorized distributors?

All INA1651IPW products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that INA1651IPW meets industry standards.

7.What is the process for return or replacement of INA1651IPW?

All INA1651IPW units undergo pre-shipment inspection (PSI). If there is an issue with INA1651IPW, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The INA1651IPW part is unused and in its original packaging.

Return procedure for INA1651IPW:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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