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Texas Instruments OPA1644AIDR
- Part No.:
- OPA1644AIDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA1644AIDR.pdf
- Description:
- IC AUDIO 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,849
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Product details
Overview
OPA1644AIDR from Texas Instruments is a quad-channel, JFET-input audio operational amplifier optimized for high-fidelity signal conditioning in professional and consumer audio systems. It delivers 5.1 nV/√Hz input voltage noise, 0.00005% THD+N at 1 kHz, 20 V/μs slew rate, ±2.25 V to ±18 V dual-supply operation, and rail-to-rail output swing - enabling low-distortion pre-amplification and active filtering in analog mixing consoles and A/V receivers.
For engineers reviewing the OPA1644AIDR datasheet, OPA1644AIDR pinout, OPA1644AIDR application, or OPA1644AIDR equivalent, this page provides verified technical context, package-validated pin functions, real-world audio use cases, and two confirmed alternative parts with documented functional and application-level differences.
Technical Context
The OPA1644AIDR implements a fully differential JFET-input stage paired with a rail-to-rail CMOS output stage, achieving ultralow distortion without phase reversal across its full common-mode range (–0.1 V to VS – 3.5 V). Its 11 MHz gain-bandwidth product and 20 V/μs slew rate support stable unity-gain operation while preserving transient fidelity in wideband audio paths.
All four channels operate independently with no crosstalk coupling - verified by –126 dB channel separation at 1 kHz - and share identical electrical characteristics including 1.8 mA per-channel quiescent current, 120 dB CMRR, and 134 dB open-loop gain at 10 kΩ load, ensuring matched performance in multi-channel stereo or surround-sound signal chains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Noise | 5.1 nV/√Hz at 1 kHz - enables low-noise amplification of high-impedance microphone or phono sources without audible hiss. |
| THD+N | 0.00005% at 1 kHz, 3 VRMS - supports >126 dB dynamic range in mastering-grade audio circuits. |
| Slew Rate | 20 V/μs - preserves transient integrity of fast-rising audio transients (e.g., drum hits) without slew-induced distortion. |
| Supply Range | ±2.25 V to ±18 V - accommodates both portable battery-powered designs (±3 V) and studio-grade ±15 V rails. |
| Output Swing | Rail-to-rail: (V–) + 0.35 V to (V+) – 0.35 V at 2 kΩ - maximizes headroom in line-level driver stages. |
| Input Bias Current | ±2 pA typical - minimizes DC error and loading in high-Z passive tone-control networks. |
| Channel Separation | –126 dB at 1 kHz - prevents inter-channel leakage in stereo/quad discrete audio routing. |
Pinout & Package
OPA1644AIDR is packaged in a 14-pin SOIC (D package), 8.65 mm × 3.90 mm body size, with exposed pad not present and RoHS-compliant lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives external load directly; rail-to-rail swing supports full-scale analog signal delivery. |
| 2 | –IN A | Inverting input for channel A - used in inverting gain configurations or as feedback node in active filters. |
| 3 | +IN A | Noninverting input for channel A - accepts high-impedance source signals with minimal bias current error. |
| 4 | V+ | Positive supply rail - must be decoupled with ≥0.1 µF ceramic capacitor near pin for stability. |
| 5 | +IN B | Noninverting input for channel B - electrically isolated from other channels to prevent crosstalk. |
| 6 | –IN B | Inverting input for channel B - shares no internal nodes with channels A, C, or D. |
| 7 | OUT B | Amplifier B output - independent output stage ensures no interaction with channel A during overload. |
| 8 | OUT C | Amplifier C output - identical specs to OUT A/B; supports discrete 4-channel audio path routing. |
| 9 | –IN C | Inverting input for channel C - validated for operation up to VS – 3.5 V common-mode voltage. |
| 10 | +IN C | Noninverting input for channel C - exhibits <2 pA bias current, critical for passive equalizer interface. |
| 11 | V– | Negative supply rail - referenced for all internal biasing; requires local 0.1 µF decoupling. |
| 12 | +IN D | Noninverting input for channel D - supports independent fourth channel in surround sound or multi-zone audio. |
| 13 | –IN D | Inverting input for channel D - immune to phase reversal even when driven beyond linear common-mode range. |
| 14 | OUT D | Amplifier D output - fully specified for same THD+N, noise, and drive capability as other channels. |
Key Features
| Feature | Design Value |
|---|---|
| No phase reversal | Guaranteed under overdrive conditions - eliminates output polarity inversion in noninverting configurations when input exceeds common-mode limits. |
| EMI rejection ratio | 96.6 dB at 5 GHz - suppresses RF rectification artifacts from Wi-Fi/Bluetooth interference in compact PCB layouts. |
| Rail-to-rail output | Swings within 350 mV of each rail at 2 kΩ - increases usable dynamic range by ≥1.4 VPP versus legacy op amps. |
| Independent channel architecture | Zero shared circuitry between channels - ensures –126 dB isolation even during hard clipping or overload recovery. |
| Low quiescent current | 1.8 mA per channel - enables 4-channel audio processing in thermally constrained enclosures without forced cooling. |
Applications
| Professional Audio Mixing Console | Analog Broadcast Studio Equipment |
|---|---|
Use Scenario: Signal buffering and summing in analog channel strips with discrete gain stages and passive EQ. IC Role / Device Role / Timing Role: Quad-channel OPA1644AIDR serves as line-driver and active filter buffer for four simultaneous input channels before analog-to-digital conversion. Use Value: 0.00005% THD+N and 5.1 nV/√Hz noise preserve harmonic integrity and SNR across full 20 Hz–20 kHz bandwidth. |
Use Scenario: Low-jitter analog audio distribution from master clock-synchronized sources to multiple broadcast outputs. IC Role / Device Role / Timing Role: OPA1644AIDR provides isolated, low-crosstalk amplification for stereo left/right and auxiliary monitor feeds. Use Value: –126 dB channel separation prevents program bleed between primary and backup audio paths. |
| High-End A/V Receiver Preamp Stage | Blu-ray™ Player Analog Audio Output |
Use Scenario: Multi-channel preamplification ahead of discrete power amplifier modules in 7.1-channel home theater systems. IC Role / Device Role / Timing Role: Each OPA1644AIDR handles two channels (e.g., front L/R + surround L/R), delivering rail-to-rail swing into 10 kΩ DAC loads. Use Value: ±2.25 V to ±18 V supply flexibility allows direct integration with existing ±15 V system rails without regulation loss. |
Use Scenario: Final-stage analog output buffering for HDMI audio extractors and legacy RCA/SPDIF-to-analog converters. IC Role / Device Role / Timing Role: OPA1644AIDR drives unbalanced line outputs with 2 VRMS full-scale signal while rejecting RFI from adjacent digital circuitry. Use Value: 96.6 dB EMIRR at 5 GHz prevents audible buzz from 802.11ac Wi-Fi co-location in compact media player chassis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar audio operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA1612AIDR | Dual-channel only; lower 1.1 nV/√Hz noise but higher 0.00008% THD+N; 10 MHz GBW vs 11 MHz. | Requires two devices for quad functionality; better for ultra-low-noise mic preamps, less optimal for multi-channel line drivers. | Select OPA1612AIDR only when dual-channel count and sub-2 nV/√Hz noise outweigh need for integrated quad layout. |
| NE5532DR | Bipolar input; 5 nV/√Hz noise; 0.0005% THD+N; ±3 V to ±20 V supply; no rail-to-rail output. | Higher distortion and limited output swing reduce headroom in modern 24-bit audio systems; widely available but aging process. | Choose NE5532DR only for legacy board refresh where pin compatibility with existing SOIC-16 footprints is mandatory. |
Compared with OPA1644AIDR, OPA1612AIDR offers superior noise performance but lacks channel integration and rail-to-rail output, while NE5532DR trades measurable distortion and swing limitations for broad industry familiarity and cost - making OPA1644AIDR the balanced choice for new high-fidelity quad-channel designs.
Availability
OPA1644AIDR is available at Aetrix Electronics and suitable for professional audio equipment, analog broadcast studio systems, and high-end A/V receivers requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for OPA1644AIDR 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 company headquartered in Dallas, Texas, specializing in analog and embedded processing technologies with leadership in precision amplifiers and audio signal chain solutions.
The OPA1644AIDR belongs to TI's SoundPlus™ audio op amp family, engineered specifically for high-fidelity analog signal conditioning - emphasizing ultralow distortion, JFET-input stability, and EMI-hardened performance in professional and premium consumer audio hardware.
FAQ
What is the maximum capacitive load the OPA1644AIDR can drive without instability?
The OPA1644AIDR maintains stability driving up to 100 pF with appropriate series output resistance (e.g., 24 Ω), as verified in Figure 19 of the SBOS484D datasheet. For loads exceeding 100 pF, external compensation or isolation resistors are required to prevent peaking or oscillation - a design constraint confirmed across all four channels of the OPA1644AIDR under ±15 V supply conditions.
Does the OPA1644AIDR support single-supply operation?
Yes, the OPA1644AIDR operates from a single 4.5 V to 36 V supply, as specified in Section 6.3 of the SBOS484D datasheet. Its rail-to-rail output and extended common-mode input range (to within 0.1 V of V–) enable true single-supply audio signal processing - a capability validated for the exact OPA1644AIDR part number in both SOIC and TSSOP packages.
What is the thermal resistance (RθJA) for the OPA1644AIDR in SOIC package?
The junction-to-ambient thermal resistance (RθJA) for the OPA1644AIDR in 14-pin SOIC (D package) is 97 °C/W, per Table 6-4 in the SBOS484D datasheet. This value assumes standard JEDEC 2S2P test board conditions and applies identically to all channels within the OPA1644AIDR device.
How does the OPA1644AIDR handle input overvoltage beyond the common-mode range?
The OPA1644AIDR incorporates internal phase-reversal protection that clamps the output to the nearest rail instead of inverting polarity when inputs exceed the linear common-mode range - a behavior explicitly guaranteed for the OPA1644AIDR in Section 7.3.1 and demonstrated in Figure 29 of SBOS484D.
Is the OPA1644AIDR pin-compatible with other members of the OPA164x family?
No - the OPA1644AIDR uses a 14-pin SOIC footprint, while OPA1641 (single) and OPA1642 (dual) use 8-pin SOIC/VSSOP packages. Pin counts, pin functions, and package dimensions differ across the OPA164x family; the OPA1644AIDR's 14-pin layout is unique to the quad variant and not interchangeable with OPA1641 or OPA1642.
OPA1644AIDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SoundPlus™
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Audio
- Number of Circuits:
- 4
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 20V/µs
- Gain Bandwidth Product:
- 11 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 2 pA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 1.8mA (x4 Channels)
- Current - Output / Channel:
- 36 mA
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
OPA1644AIDR FAQ
1.How can I place an order for OPA1644AIDR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA1644AIDR 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 OPA1644AIDR reliable?
The price and inventory of OPA1644AIDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA1644AIDR is usually 5 days.
3.What payment methods are accepted for OPA1644AIDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA1644AIDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA1644AIDR?
OPA1644AIDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA1644AIDR 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 OPA1644AIDR?
For technical support, including OPA1644AIDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA1644AIDR requirements.
6.How does Aetrix verify that OPA1644AIDR is sourced from the original manufacturer or authorized distributors?
All OPA1644AIDR 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 OPA1644AIDR meets industry standards.
7.What is the process for return or replacement of OPA1644AIDR?
All OPA1644AIDR units undergo pre-shipment inspection (PSI). If there is an issue with OPA1644AIDR, 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 OPA1644AIDR part is unused and in its original packaging.
Return procedure for OPA1644AIDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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