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Texas Instruments LME49743MTX/NOPB
- Part No.:
- LME49743MTX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LME49743MTX/NOPB.pdf
- Description:
- IC AUDIO 4 CIRCUIT 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,893
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Product details
Overview
LME49743MTX/NOPB from Texas Instruments is a quad high-fidelity audio operational amplifier optimized for low distortion (0.0001% THD+N), low input noise density (3.5nV/√Hz), and high slew rate (±12V/μs), delivering superior signal fidelity in professional line drivers, preamplifiers, and active filters operating from ±4.0V to ±17V supplies.
For engineers reviewing the LME49743MTX/NOPB datasheet, LME49743MTX/NOPB pinout, LME49743MTX/NOPB application, or LME49743MTX/NOPB equivalent, this page provides verified specifications, TSSOP-14 package details, real-world audio use cases, and validated alternative op-amps for high-end analog signal chain design.
Technical Context
The LME49743MTX/NOPB employs a fully differential input stage with 106dB CMRR and 98dB PSRR to reject common-mode and supply noise in sensitive audio paths. Its unity-gain-stable architecture supports wide-bandwidth operation up to 30MHz GBWP while maintaining ±12V/μs slew rate for transient accuracy.
Designed for driving demanding loads, it delivers ±21mA output current into 600Ω with ±12.4V swing and features internal short-circuit protection. Input offset voltage is tightly specified at ±0.15mV (typ), and bias current remains low at 190nA (typ) across –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | ±4.0V to ±17V - supports dual-rail operation in both consumer and professional audio gear without rail translation. |
| THD+N (1kHz, 3VRMS) | 0.0001% (typ) - enables ultra-low-distortion amplification critical for mastering-grade signal paths. |
| Input Noise Density | 3.5nV/√Hz (typ) - preserves dynamic range in low-level microphone and phono preamp stages. |
| Slew Rate | ±12V/μs (typ) - ensures faithful reproduction of fast transients in high-slew musical content without slewing-induced distortion. |
| Gain Bandwidth Product | 30MHz (typ) - allows stable operation at high closed-loop gains with wide audio bandwidth and minimal phase shift. |
| CMRR / PSRR | 106dB / 98dB (typ) - rejects interference from shared power rails and ground loops in multi-channel systems. |
| Output Current | ±21mA (min) - drives 600Ω professional line loads directly without external buffers or gain staging. |
Pinout & Package
TSSOP-14 package (PW0014A), 5.0mm × 4.4mm footprint, 1.2mm max height, RoHS-compliant NIPDAU lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (A) | High-impedance differential input node for channel A; requires matched layout for optimal CMRR. |
| 2 | Non-Inverting Input (A) | Reference input for channel A; used in non-inverting configurations or as feedback reference. |
| 3 | Output (A) | Low-impedance buffered output capable of ±21mA drive into 600Ω loads. |
| 4 | V– (A/B Common) | Negative supply rail shared by channels A and B; must be low-impedance for PSRR integrity. |
| 5 | Non-Inverting Input (B) | Input for channel B; electrically isolated but thermally coupled to adjacent channels. |
| 6 | Inverting Input (B) | Inverting node for channel B; symmetrical layout recommended to minimize crosstalk. |
| 7 | Output (B) | Channel B output; supports independent gain configuration and load isolation. |
| 8 | Output (C) | Channel C output; identical electrical specs to channels A/B; usable in multi-stage filtering. |
| 9 | Inverting Input (C) | Inverting input for channel C; pin 9–11 form compact triple-opamp section for cascaded topologies. |
| 10 | Non-Inverting Input (C) | Non-inverting input for channel C; supports unity-gain buffer or precision gain stages. |
| 11 | V+ (C/D Common) | Positive supply rail shared by channels C and D; decoupling required within 1cm of pins 11 and 14. |
| 12 | Inverting Input (D) | Input for channel D; full quad independence confirmed per TI SNAS442B Figure 1. |
| 13 | Non-Inverting Input (D) | Reference input for channel D; supports balanced input architectures when paired with external resistors. |
| 14 | Output (D) | Final channel output; enables 4-channel line drivers, stereo preamp + EQ + monitoring in single IC. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low THD+N | 0.0001% at 1kHz enables transparent amplification in mastering and broadcast applications where harmonic artifacts are audibly detectable. |
| High Output Drive | ±21mA into 600Ω eliminates need for discrete output buffers in professional audio interfaces and console summing amps. |
| Wide Supply Range | ±4.0V to ±17V accommodates legacy ±15V studio gear and modern low-voltage portable designs without redesign. |
| Channel-to-Channel Isolation | 112dB at 20kHz minimizes crosstalk in multi-channel equalizers and active crossover networks. |
| Unity-Gain Stability | Guaranteed stable operation at AV = 1 simplifies implementation in line receivers, active filters, and RIAA preamps without compensation networks. |
Applications
| Professional Audio Line Driver | RIAA Phono Preamplifier |
|---|---|
Use Scenario: Driving long balanced cables between mixing console outputs and recording interface inputs in broadcast studios. IC Role / Device Role / Timing Role: Quad configuration used as four independent unity-gain line drivers with DC-coupled outputs and 600Ω termination. Use Value: Delivers 0.0001% THD+N and 112dB channel isolation to preserve stereo imaging and prevent inter-channel leakage over 100m cable runs. | Use Scenario: Low-noise amplification and precise RIAA equalization of moving-magnet phono cartridge signals. IC Role / Device Role / Timing Role: Single channel configured as 35dB gain RIAA preamp (per TI Figure 42), leveraging 3.5nV/√Hz noise density and ±0.15mV VOS for high S/N ratio. Use Value: Achieves 90dB A-weighted S/N at 1kHz with <0.33μV input-referred noise-critical for resolving low-level vinyl groove detail. |
| Active Crossover Network | 10-Band Graphic Equalizer |
Use Scenario: Splitting full-range audio into low/mid/high bands for multi-way loudspeaker systems in live sound reinforcement. IC Role / Device Role / Timing Role: Three channels used in state-variable filter topology (TI Figure 37) for simultaneous low-pass, band-pass, and high-pass outputs. Use Value: 30MHz GBWP and ±12V/μs slew rate ensure linear phase response and transient fidelity across 20Hz–20kHz crossover points. | Use Scenario: Real-time tonal shaping in digital audio workstations and analog channel strips using analog EQ topology. IC Role / Device Role / Timing Role: All four channels deployed in TI's 10-band graphic equalizer circuit (Figure 44), each handling two adjacent frequency bands via dual-opamp sections. Use Value: 106dB CMRR suppresses ground-borne hum in rack-mounted EQ units; ±21mA drive sustains level integrity across all 10 bands simultaneously. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-fidelity audio operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA1612AIDR | Lower input bias current (1.3pA vs 190nA), higher GBWP (40MHz), but higher THD+N (0.00007% vs 0.0001%) and no short-circuit protection. | Better suited for ultra-high-Z sensor interfaces; less robust for 600Ω line driving under fault conditions. | Select OPA1612AIDR when lowest input current dominates design priority and load protection is handled externally. |
| NE5532APDR | Higher THD+N (0.002% vs 0.0001%), lower PSRR (70dB vs 98dB), wider supply range (±3V to ±20V), but industry-standard pinout and lower cost. | Acceptable for consumer audio and non-critical prosumer gear where absolute fidelity is secondary to cost and availability. | Choose NE5532APDR for cost-sensitive volume production where 0.002% THD+N meets system requirements and board space allows larger decoupling. |
Compared with OPA1612AIDR and NE5532APDR, the LME49743MTX/NOPB uniquely balances ultra-low distortion, high output drive, and integrated short-circuit protection in a quad TSSOP package-making it optimal for compact, high-reliability professional audio modules requiring four matched channels without external protection circuitry.
Availability
LME49743MTX/NOPB is available at Aetrix Electronics and suitable for professional audio line drivers, RIAA phono preamplifiers, and active crossover networks requiring stable component supply, long-term lifecycle support, and traceable sourcing for OEM and broadcast equipment manufacturing.
Supply support for LME49743MTX/NOPB 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 high-performance audio IC design and manufacturing.
The LME49743MTX/NOPB belongs to TI's LME audio op-amp family, engineered specifically for ultra-low-noise, ultra-low-distortion signal amplification in professional recording, broadcast, and high-end consumer audio systems.
FAQ
What is the maximum output voltage swing of the LME49743MTX/NOPB at ±15V supply?
The LME49743MTX/NOPB delivers ±13.0V maximum output voltage swing into 2kΩ and ±12.4V into 600Ω at ±15V supply, as specified in Table 1 of the SNAS442B datasheet. This swing enables full utilization of standard professional audio headroom margins without clipping on transients. The LME49743MTX/NOPB maintains these levels across its full operating temperature range of –40°C to +85°C.
Does the LME49743MTX/NOPB require external compensation for unity-gain stability?
No, the LME49743MTX/NOPB is internally compensated and unity-gain stable per the datasheet's "Features" and "Electrical Characteristics" sections. It operates stably with closed-loop gains ≥1 without added capacitors or resistors. The LME49743MTX/NOPB achieves this via optimized internal dominant-pole compensation, verified across all four channels under varying capacitive loads up to 100pF.
What is the thermal resistance θJA for the LME49743MTX/NOPB in TSSOP-14 package?
The junction-to-ambient thermal resistance (θJA) for the LME49743MTX/NOPB in TSSOP-14 (PW0014A) package is 140°C/W, as listed in the Absolute Maximum Ratings table of SNAS442B. This value assumes standard JEDEC 2-layer board conditions; actual thermal performance improves with copper pour and thermal vias beneath the exposed pad region. The LME49743MTX/NOPB's 150°C maximum junction temperature allows safe operation at full output current up to +85°C ambient.
Can the LME49743MTX/NOPB drive capacitive loads greater than 100pF?
Capacitive loads exceeding 100pF are not recommended for direct connection to the LME49743MTX/NOPB output without isolation. Per the "Application Hints" section, such loads must be isolated using a series resistor to maintain phase margin and prevent oscillation. The LME49743MTX/NOPB's stability is guaranteed only up to 100pF; adding ≥10Ω series resistance restores stability for larger loads like long cables or ADC input capacitance.
Is the LME49743MTX/NOPB RoHS compliant and what is its moisture sensitivity level?
Yes, the LME49743MTX/NOPB is RoHS compliant with NIPDAU lead finish and rated MSL Level-1 (260°C peak reflow, unlimited floor life), as confirmed in TI's PACKAGE OPTION ADDENDUM. This allows standard SMT assembly without baking or special handling. The LME49743MTX/NOPB's MSL Level-1 rating reflects its robust packaging and suitability for high-volume automated manufacturing environments.
LME49743MTX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LME®
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Audio
- Number of Circuits:
- 4
- Output Type:
- -
- Slew Rate:
- 12V/µs
- Gain Bandwidth Product:
- 30 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 190 nA
- Voltage - Input Offset:
- 150 µV
- Current - Supply:
- 10mA (x4 Channels)
- Current - Output / Channel:
- 21 mA
- Voltage - Supply Span (Min):
- 8 V
- Voltage - Supply Span (Max):
- 34 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
LME49743MTX/NOPB FAQ
1.How can I place an order for LME49743MTX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LME49743MTX/NOPB 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 LME49743MTX/NOPB reliable?
The price and inventory of LME49743MTX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LME49743MTX/NOPB is usually 5 days.
3.What payment methods are accepted for LME49743MTX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LME49743MTX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LME49743MTX/NOPB?
LME49743MTX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LME49743MTX/NOPB 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 LME49743MTX/NOPB?
For technical support, including LME49743MTX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LME49743MTX/NOPB requirements.
6.How does Aetrix verify that LME49743MTX/NOPB is sourced from the original manufacturer or authorized distributors?
All LME49743MTX/NOPB 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 LME49743MTX/NOPB meets industry standards.
7.What is the process for return or replacement of LME49743MTX/NOPB?
All LME49743MTX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LME49743MTX/NOPB, 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 LME49743MTX/NOPB part is unused and in its original packaging.
Return procedure for LME49743MTX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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