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Texas Instruments OPA1644AIPW
- Part No.:
- OPA1644AIPW
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
OPA1644AIPW.pdf
- Description:
- IC AUDIO 4 CIRCUIT 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,824
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Product details
Overview
OPA1644AIPW 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 line-driver stages in analog mixing consoles and A/V receivers.
For engineers reviewing the OPA1644AIPW datasheet, OPA1644AIPW pinout, OPA1644AIPW application, or OPA1644AIPW equivalent, key selection criteria include ultra-low distortion performance under 2-kΩ load, phase-reversal immunity across full common-mode range, EMI rejection up to 96.6 dB at 5 GHz, thermal stability over –40°C to +85°C, and compatibility with SOIC-14 and TSSOP-14 PCB footprints.
Technical Context
The OPA1644AIPW employs a fully differential JFET input stage with <2 pA input bias current and extremely stable input capacitance, enabling high-impedance source interfacing without degradation of frequency response or distortion. Its rail-to-rail output stage uses complementary bipolar drivers to achieve 3.2 MHz full-power bandwidth and 600 ns overload recovery while maintaining unity-gain stability.
Each of the four independent amplifiers features no phase reversal, internal current limiting (±30–36 mA), and >120 dB channel separation at 1 kHz - ensuring minimal crosstalk in multi-channel audio routing. The device operates across ±2.25 V to ±18 V supplies and maintains 126 dB CMRR and PSRR up to 100 kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| THD+N | 0.00005% at 1 kHz, 3 VRMS output into 2 kΩ - enables transparent gain staging in master bus and monitor paths without audible coloration. |
| Input Voltage Noise | 5.1 nV/√Hz at 1 kHz - preserves dynamic range in microphone preamp and phono stage applications with high source impedance. |
| Slew Rate | 20 V/μs - supports clean reproduction of transient-rich audio signals (e.g., drum transients) 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 | (V−)+0.35 V to (V+)-0.35 V into 2 kΩ - delivers >27 VRMS headroom at ±15 V supply, maximizing SNR in line-level circuits. |
| Channel Separation | −126 dB at 1 kHz - prevents inter-channel leakage in stereo/quad summing and surround decoding applications. |
| EMIRR IN+ | 96.6 dB at 5 GHz - suppresses RF rectification artifacts from Wi-Fi/Bluetooth interference in compact PCB layouts. |
Pinout & Package
OPA1644AIPW is available in 14-pin SOIC (D) package (8.65 mm × 3.90 mm) and 14-pin TSSOP (PW) package (5.00 mm × 4.40 mm), both RoHS-compliant and rated for −40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 7, 8, 14 | OUT A / OUT B / OUT C / OUT D | Amplifier outputs - each independently drives 2 kΩ loads with rail-to-rail swing and 600 ns overload recovery. |
| 2, 6, 9, 13 | −IN A / −IN B / −IN C / −IN D | Inverting inputs - high-impedance JFET nodes (<2 pA bias current) compatible with passive filter networks and feedback dividers. |
| 3, 5, 10, 12 | +IN A / +IN B / +IN C / +IN D | Noninverting inputs - symmetric layout ensures matched EMI rejection (EMIRR IN+) and CMRR ≥120 dB. |
| 4 | V+ | Positive supply rail - accepts up to ±18 V; decoupling with 0.1 µF + 10 µF recommended per amplifier pair. |
| 11 | V− | Negative supply rail - shared return path for all four channels; requires low-impedance ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| No phase reversal | Prevents output inversion when inputs exceed common-mode range - eliminates latch-up risk in noninverting gain stages with large DC offsets. |
| Rail-to-rail output | Delivers >98% of supply voltage swing into 2 kΩ - maximizes usable dynamic range in single-supply line drivers and active filters. |
| Independent channel circuitry | Zero shared bias or signal paths between channels - guarantees −126 dB crosstalk even during overload or clipping conditions. |
| Low quiescent current | 1.8 mA per channel at 25°C - enables thermal management in dense quad-channel PCB layouts without forced airflow. |
| EMI rejection ratio | 96.6 dB at 5 GHz - mitigates audible heterodyne tones from 802.11a/n co-location in smart speakers and streaming A/V receivers. |
Applications
| Professional Audio Mixing Console | Analog Broadcast Studio Equipment |
|---|---|
Use Scenario: Summing multiple mic/line inputs into stereo master bus with minimal crosstalk and distortion. IC Role / Device Role / Timing Role: Quad-channel line driver and active summing node - each OPA1644AIPW channel handles one bus leg (L/R, M/S, or surround). Use Value: −126 dB channel separation and 0.00005% THD+N preserve spatial imaging and transient fidelity across 20 Hz–20 kHz bandwidth. |
Use Scenario: Low-noise analog signal distribution from console to transmission encoder and monitoring paths. IC Role / Device Role / Timing Role: Quad-channel buffer and level-shifting amplifier - isolating sensitive analog sections from digital control logic and power domains. Use Value: 5.1 nV/√Hz noise floor and 96.6 dB EMIRR prevent RF ingress from adjacent broadcast transmitters and digital clock harmonics. |
| High-End A/V Receiver Preamp Stage | Quadraphonic Audio Playback System |
Use Scenario: Driving tone controls, volume attenuators, and DSP interface inputs in multi-zone home theater receivers. IC Role / Device Role / Timing Role: Quad-channel DC-coupled preamplifier - providing gain, impedance transformation, and common-mode rejection before ADC sampling. Use Value: ±2.25 V to ±18 V supply flexibility supports both 5 V microcontroller-controlled zones and ±15 V analog front-end rails. |
Use Scenario: Discrete channel amplification in immersive audio playback systems (e.g., 4.0 or 4.1 speaker configurations). IC Role / Device Role / Timing Role: Quad-channel line-level driver - delivering matched gain, phase, and distortion characteristics across all four channels. Use Value: Independent per-channel architecture ensures identical transient response and overload recovery (600 ns) for synchronized spatial rendering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar audio op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA1656AIPW | Lower noise (3.5 nV/√Hz), higher quiescent current (3.6 mA/ch), same SOIC-14 footprint. | Better suited for ultra-low-noise microphone preamps; less optimal for thermally constrained multi-channel PCBs. | Select OPA1656AIPW only when THD+N < 0.00002% and noise < 4 nV/√Hz are required - otherwise OPA1644AIPW offers superior power/noise trade-off. |
| NE5532APW | Bipolar input (200 nA IB), higher THD+N (0.002%), lower slew rate (9 V/μs), same 14-pin SOIC package. | Legacy design compatibility; not suitable for high-Z sources or wide common-mode swing applications. | Choose NE5532APW for cost-sensitive legacy replacements where JFET input and sub-0.0001% THD+N are not required. |
Compared with OPA1656AIPW and NE5532APW, the OPA1644AIPW uniquely balances ultra-low distortion (0.00005%), JFET-input impedance (>10¹³ Ω), and 1.8 mA/channel quiescent current - making it the optimal choice for thermally dense, high-channel-count audio routing where phase integrity and EMI immunity are critical.
Availability
OPA1644AIPW 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 support, and traceable sourcing.
Supply support for OPA1644AIPW 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 leadership in precision op-amp design and audio signal chain innovation.
The OPA164x product line was engineered specifically for high-fidelity audio applications - emphasizing ultralow distortion, JFET-input stability, and robust EMI immunity in studio, broadcast, and premium consumer equipment.
FAQ
What is the maximum capacitive load the OPA1644AIPW can drive without instability?
The OPA1644AIPW maintains stability driving up to 100 pF capacitive load with appropriate series output resistance (e.g., 24 Ω). Figure 19 in the SBOS484D datasheet shows <5% overshoot at 100 pF with ROUT = 24 Ω. For loads >100 pF, external compensation or isolation resistors are required - the OPA1644AIPW is not unity-gain stable into purely capacitive loads exceeding this threshold without added series impedance.
Does the OPA1644AIPW support single-supply operation?
Yes, the OPA1644AIPW supports single-supply operation from 4.5 V to 36 V, as specified in Section 6.3 of the datasheet. Its rail-to-rail output and extended common-mode input range (V− − 0.1 V to V+ − 3.5 V) enable use in 5 V or 12 V single-rail audio interfaces, provided input biasing and output coupling are properly implemented per TI's Application Report SLOA058.
What is the thermal resistance (RθJA) for the OPA1644AIPW in SOIC-14 package?
The junction-to-ambient thermal resistance (RθJA) for the OPA1644AIPW in 14-pin SOIC (D) package is 97°C/W, as listed in Table 6-4 of the SBOS484D datasheet. This value assumes standard JEDEC 2-layer board conditions; actual thermal performance improves with copper pour and thermal vias.
How does the OPA1644AIPW handle input overdrive beyond the common-mode range?
The OPA1644AIPW incorporates internal phase-reversal protection. When either input exceeds the linear common-mode range (V− − 0.1 V to V+ − 3.5 V), the output saturates cleanly at the nearest rail instead of inverting polarity - preventing catastrophic latch-up in noninverting configurations and preserving downstream stage integrity.
Is the OPA1644AIPW pin-compatible with other devices in the OPA164x family?
No - the OPA1644AIPW (14-pin quad) is not pin-compatible with the OPA1641 (8-pin single) or OPA1642 (8-pin dual). Its 14-pin SOIC/TSSOP layout allocates dedicated pins for all four channels' inputs and outputs, plus shared V+ and V− rails, differing fundamentally from the 8-pin dual/single pinouts shown in Sections 5.1 and 5.2 of SBOS484D.
OPA1644AIPW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SoundPlus™
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- 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-TSSOP
OPA1644AIPW FAQ
1.How can I place an order for OPA1644AIPW through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA1644AIPW 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 OPA1644AIPW reliable?
The price and inventory of OPA1644AIPW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA1644AIPW is usually 5 days.
3.What payment methods are accepted for OPA1644AIPW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA1644AIPW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA1644AIPW?
OPA1644AIPW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA1644AIPW 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 OPA1644AIPW?
For technical support, including OPA1644AIPW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA1644AIPW requirements.
6.How does Aetrix verify that OPA1644AIPW is sourced from the original manufacturer or authorized distributors?
All OPA1644AIPW 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 OPA1644AIPW meets industry standards.
7.What is the process for return or replacement of OPA1644AIPW?
All OPA1644AIPW units undergo pre-shipment inspection (PSI). If there is an issue with OPA1644AIPW, 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 OPA1644AIPW part is unused and in its original packaging.
Return procedure for OPA1644AIPW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA1644AIPW Tags
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