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Texas Instruments OPA1642AID
- Part No.:
- OPA1642AID
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA1642AID.pdf
- Description:
- IC AUDIO 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,906
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Product details
Overview
OPA1642AID from Texas Instruments is a dual-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 broadcast equipment.
For engineers reviewing the OPA1642AID datasheet, OPA1642AID pinout, OPA1642AID application, or OPA1642AID equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions for SOIC-8 layout, confirmed audio-grade performance boundaries, and two rigorously cross-checked alternative parts with documented functional and application-level differences.
Technical Context
The OPA1642AID uses a fully differential JFET input stage with ultra-stable input capacitance (≤1.5 pF) and no phase reversal - critical for maintaining signal integrity during common-mode overdrive in noninverting microphone preamp topologies. Its rail-to-rail output stage supports ≥3.5 VPP swing into 2 kΩ at ±15 V supply while sustaining 11 MHz gain-bandwidth and 20 V/μs slew rate without distortion-induced clipping.
Each channel operates independently with <–126 dB channel separation at 1 kHz, enabling stereo signal paths without crosstalk-induced imaging artifacts. The device's 2 pA typical input bias current and 10¹³ Ω || 6 pF common-mode input impedance preserve source signal fidelity even with high-impedance passive tone controls or transformer-coupled inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Noise | 5.1 nV/√Hz at 1 kHz - enables <–126 dB THD+N in line-level stages without adding measurable noise floor |
| THD+N | 0.00005% at 1 kHz, 3 VRMS - meets professional audio requirements for analog mixing console summing amplifiers |
| Slew Rate | 20 V/μs - supports full-swing transient response up to 3.2 MHz without slewing distortion |
| Supply Range | ±2.25 V to ±18 V - accommodates legacy ±15 V studio gear and modern low-voltage portable A/V receivers |
| Quiescent Current | 1.8 mA per channel - allows dual-channel operation in thermally constrained PCB layouts without forced cooling |
| Output Swing | (V–)+0.35 V to (V+)-0.35 V into 2 kΩ - delivers >29 VPP headroom at ±18 V supply for peak transient handling |
| CMRR | 126 dB - rejects power supply ripple and ground bounce in multi-stage active filter designs |
Pinout & Package
OPA1642AID is housed in an 8-pin SOIC package (4.90 mm × 3.90 mm body size), compatible with standard surface-mount reflow profiles and manual prototyping workflows.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT A | Output, Channel A | Low-impedance rail-to-rail output capable of sourcing 36 mA / sinking 30 mA; requires local 0.1 µF + 10 µF decoupling |
| 2 - –IN A | Inverting Input, Channel A | High-impedance JFET node; sensitive to EMI - must be routed short and shielded from digital traces |
| 3 - +IN A | Noninverting Input, Channel A | EMI-rejected input (EMIRR IN+ = 86.8 dB at 2.4 GHz); used for unity-gain buffer or inverting gain stages |
| 4 - V– | Negative Supply Rail | Reference for both channels; must be low-impedance with dedicated ground plane connection |
| 5 - +IN B | Noninverting Input, Channel B | Independent input for stereo or dual-path processing; no shared circuitry with Channel A |
| 6 - –IN B | Inverting Input, Channel B | Matched to Channel A for balanced differential pair implementation; same noise and bias characteristics |
| 7 - OUT B | Output, Channel B | Fully isolated output; <–126 dB crosstalk ensures channel separation in stereo headphone drivers |
| 8 - V+ | Positive Supply Rail | Power entry point for both amplifiers; requires symmetric decoupling to V– for PSRR optimization |
Key Features
| Feature | Design Value |
|---|---|
| No Phase Reversal | Prevents output polarity inversion when input exceeds common-mode range - eliminates latch-up risk in microphone preamp overdrive conditions |
| Rail-to-Rail Output | Delivers >98% of supply voltage swing into 2 kΩ loads - maximizes dynamic range in ±15 V analog mixing console summing buses |
| Ultra-Low Distortion | 0.00005% THD+N at 1 kHz enables transparent signal path in master bus amplifiers where cumulative distortion matters |
| EMI Immunity | 86.8 dB EMIRR IN+ at 2.4 GHz - suppresses Bluetooth/Wi-Fi interference in compact A/V receiver PCBs near RF modules |
| Independent Channels | Zero shared circuitry between A/B channels - guarantees <–126 dB crosstalk for stereo imaging accuracy in broadcast monitors |
Applications
| Professional Audio Pre-Amplifier | Analog Mixing Console Summing Amplifier |
|---|---|
Use Scenario: Low-noise gain stage for condenser microphone signals with 10 kΩ source impedance and ±15 V supply rails. IC Role / Device Role / Timing Role: Dual-channel JFET-input op-amp configured as noninverting preamp (Channel A) and phantom power reference buffer (Channel B). Use Value: 5.1 nV/√Hz noise and 2 pA input bias current prevent degradation of weak microphone signals; rail-to-rail output preserves headroom during transient peaks. |
Use Scenario: Final summing stage combining 16 analog channel outputs into stereo master bus in live sound console. IC Role / Device Role / Timing Role: Dual-channel unity-gain buffer isolating summing node from downstream DAC or power amp load. Use Value: <–126 dB channel separation prevents stereo image collapse; 0.00005% THD+N avoids audible coloration in critical monitoring paths. |
| Broadcast Studio Line Driver | High-End A/V Receiver Tone Control |
Use Scenario: Driving 100 m cable runs to remote monitor speakers in radio broadcast control rooms using ±12 V supplies. IC Role / Device Role / Timing Role: Dual-channel line driver with 600 Ω output impedance emulation and DC-coupled output stage. Use Value: 20 V/μs slew rate ensures full-swing 20 kHz square wave integrity; 11 MHz GBW supports wideband equalization without phase lag. |
Use Scenario: Active bass/treble adjustment stage in premium home theater receiver with discrete passive components. IC Role / Device Role / Timing Role: Dual-channel inverting op-amp implementing shelving filters with high-impedance feedback networks. Use Value: 10¹³ Ω input impedance prevents loading of passive RC networks; stable JFET input avoids drift-induced tonal shift over time. |
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 | Lower 1.1 nV/√Hz noise but higher 2.6 mA/channel quiescent current; no EMI rejection spec provided | Better for ultra-low-noise mic preamps where power budget allows; unsuitable for RF-noisy environments like smart speakers | Select OPA1612AIDR only when noise dominates over EMI immunity and thermal constraints permit +44% IQ increase |
| NE5532AP | Bipolar input (200 nA IB), higher 5 nV/√Hz noise, no rail-to-rail output, fixed ±15 V optimal operation | Legacy compatibility in repair scenarios; cannot replace OPA1642AID in low-voltage or high-Z source designs | Use NE5532AP only for drop-in replacement in existing ±15 V circuits with resistive sources >1 kΩ and THD+N >0.002% |
Compared with OPA1642AID, OPA1612AIDR trades higher power for lower noise in clean environments, while NE5532AP offers cost-effective legacy support but lacks JFET advantages in impedance matching, EMI resilience, and supply flexibility.
Availability
OPA1642AID is available at Aetrix Electronics and suitable for professional audio equipment, analog mixing consoles, and broadcast studio equipment requiring stable component supply across long production lifecycles.
Supply support for OPA1642AID 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 precision amplifiers and audio signal chain solutions.
The OPA164x family was engineered specifically for high-end audio applications demanding ultralow distortion, JFET input fidelity, and robust EMI immunity - targeting professional recording, broadcast, and premium consumer A/V systems.
FAQ
What is the maximum capacitive load the OPA1642AID can drive without instability?
The OPA1642AID maintains stability driving up to 100 pF capacitive load with proper PCB layout and 0 Ω series output resistance. At 100 pF, small-signal overshoot remains below 10% for 100-mV steps. For loads >100 pF, external isolation resistor (24 Ω–51 Ω) is required - verified in Figure 19 of the SBOS484D datasheet. This behavior applies identically to both channels of the OPA1642AID under ±15 V supply conditions.
Does the OPA1642AID support single-supply operation?
Yes, the OPA1642AID operates from 4.5 V to 36 V single supply, per Section 6.3 of the datasheet. Its rail-to-rail output and extended common-mode range (V– – 0.1 V to V+ – 3.5 V) allow true single-supply use in 5 V or 12 V audio systems. However, input bias current increases above 10 pA when common-mode voltage exceeds V+ – 3.5 V - a constraint explicitly defined for the OPA1642AID in electrical characteristics tables.
What is the thermal resistance (RθJA) of the OPA1642AID in SOIC-8 package?
The OPA1642AID in SOIC-8 (D package) has a junction-to-ambient thermal resistance (RθJA) of 160°C/W, as specified in Table 6-4 of the SBOS484D datasheet. This value assumes standard JEDEC 2S2P board layout; actual thermal performance improves to ≤138°C/W with enhanced copper pour and thermal vias - a design parameter confirmed for the OPA1642AID across its full operating temperature range (–40°C to +85°C).
How does the OPA1642AID handle input overvoltage beyond the common-mode range?
The OPA1642AID features internal phase-reversal protection that clamps the output to the nearest rail instead of inverting polarity when input exceeds the linear common-mode range - a behavior validated in Figure 29 of the datasheet. This prevents catastrophic signal corruption in microphone preamp overdrive events. Unlike many op-amps, the OPA1642AID sustains this protection across its full ±2.25 V to ±18 V supply range without degrading THD+N or bandwidth.
Is the OPA1642AID pin-compatible with other devices in the OPA164x family?
No - the OPA1642AID (dual-channel, SOIC-8) has a unique pinout incompatible with the OPA1641 (single, SOIC-8) and OPA1644 (quad, SOIC-14/TSSOP-14). Pin 1 is OUT A on OPA1642AID but NC on OPA1641; pin 4 is V– on OPA1642AID but V– on OPA1641 - but pin 5 is +IN B on OPA1642AID versus NC on OPA1641. This physical incompatibility is documented in Section 5 of SBOS484D and applies strictly to the OPA1642AID part number.
OPA1642AID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SoundPlus™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Audio
- Number of Circuits:
- 2
- 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 (x2 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:
- 8-SOIC
OPA1642AID FAQ
1.How can I place an order for OPA1642AID through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA1642AID 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 OPA1642AID reliable?
The price and inventory of OPA1642AID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA1642AID is usually 5 days.
3.What payment methods are accepted for OPA1642AID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA1642AID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA1642AID?
OPA1642AID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA1642AID 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 OPA1642AID?
For technical support, including OPA1642AID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA1642AID requirements.
6.How does Aetrix verify that OPA1642AID is sourced from the original manufacturer or authorized distributors?
All OPA1642AID 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 OPA1642AID meets industry standards.
7.What is the process for return or replacement of OPA1642AID?
All OPA1642AID units undergo pre-shipment inspection (PSI). If there is an issue with OPA1642AID, 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 OPA1642AID part is unused and in its original packaging.
Return procedure for OPA1642AID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA1642AID Tags
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LM358DT
STMicroelectronics
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LM358DR
Texas Instruments
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LM2904DR
Texas Instruments
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LM358ADR
Texas Instruments
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LM2904DGKR
Texas Instruments
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LM324DR
Texas Instruments
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MCP6006T-E/OT
Microchip Technology
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MCP6006UT-E/OT
Microchip Technology
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LM324PWR
Texas Instruments
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LM2902PWR
Texas Instruments
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LM2902DR
Texas Instruments
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LM358P
Texas Instruments
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