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Texas Instruments LME49870MAX/NOPB
- Part No.:
- LME49870MAX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LME49870MAX/NOPB.pdf
- Description:
- IC AUDIO 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,991
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Product details
Overview
LME49870MAX/NOPB from Texas Instruments is a single high-fidelity audio operational amplifier optimized for ultra-low distortion and low-noise signal amplification in professional and high-end consumer audio systems. It delivers 2.7nV/√Hz input voltage noise density, 0.00003% THD+N at 1kHz into 2kΩ, ±20V/μs slew rate, and operates from ±2.5V to ±22V supplies - enabling use in phono preamplifiers, active crossover networks, and line drivers requiring exceptional signal integrity.
For engineers reviewing the LME49870MAX/NOPB datasheet, LME49870MAX/NOPB pinout, LME49870MAX/NOPB application, or LME49870MAX/NOPB equivalent, key selection criteria include verified THD+N performance below 0.0001%, output drive capability into 600Ω loads, PSRR/CMRR >120dB, rail-to-rail output swing margin (≤1.4V from rails), and SOIC-8 packaging compatibility with high-density PCB layouts.
Technical Context
The LME49870MAX/NOPB employs a proprietary bipolar input stage with advanced current mirror topology to achieve vanishingly low THD+N and DC offset drift (0.1μV/°C). Its fully differential internal architecture ensures symmetrical slew behavior and minimizes even-order harmonic generation under dynamic load conditions.
Designed for unity-gain stability with capacitive loads up to 100pF, the amplifier integrates short-circuit protection and thermal shutdown while maintaining open-loop gain of 140dB into 600Ω - critical for precision equalization and feedback-controlled filter stages in active analog signal chains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| THD+N | 0.00003% typ at 1kHz, 3VRMS, 2kΩ load - enables transparent amplification without audible coloration in mastering-grade audio paths. |
| Slew Rate | ±20V/μs typ - supports full-swing transient response up to 20kHz without slewing-induced distortion in high-slew-demand applications like headphone drivers. |
| Input Noise Density | 2.7nV/√Hz typ at 1kHz - preserves dynamic range in low-level signal stages such as moving-magnet phono preamps where source impedance is ~47kΩ. |
| PSRR / CMRR | 120dB typ - rejects power supply ripple and common-mode interference in multi-rail audio systems with shared ground planes. |
| Output Swing | ±20.4V min into 2kΩ at ±22V supply - delivers >38Vpp output headroom, essential for driving transformer-coupled outputs or high-voltage DAC buffers. |
| Supply Range | ±2.5V to ±22V - accommodates portable battery-powered designs (±3V) and studio-grade equipment (±18V–±22V) without redesign. |
| Gain Bandwidth | 55MHz typ - ensures stable phase margin and minimal group delay across the entire 20Hz–20kHz audio band, even with complex reactive loads. |
Pinout & Package
Package: 8-pin narrow-body SOIC (Package Number D0008A, θJA = 145°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NC | No connection - electrically isolated; must remain unconnected per datasheet to avoid parasitic coupling or oscillation. |
| 2 | Inverting Input (−IN) | Differential input node accepting feedback network return; high-impedance (30kΩ diff, 1000MΩ common-mode) for precision gain-setting. |
| 3 | Non-Inverting Input (+IN) | High-impedance reference input; bias current ≤10nA allows direct coupling to passive RIAA networks without DC error accumulation. |
| 4 | V− | Negative supply rail - supports operation down to −22V; requires local 100nF ceramic decoupling within 5mm of pin. |
| 5 | Output (VOUT) | Class-AB output stage capable of ±37mA peak current into 600Ω - drives long cables, transformers, or active filters without clipping. |
| 6 | V+ | Positive supply rail - supports operation up to +22V; low PSRR sensitivity ensures clean output even with noisy switching supplies. |
| 7 | NC | No connection - electrically isolated; floating or grounded connection degrades PSRR and increases EMI susceptibility. |
| 8 | NC | No connection - electrically isolated; not internally bonded; solder mask coverage recommended to prevent contamination. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low THD+N | 0.00003% at 1kHz enables audibly transparent gain stages in recording console summing amps and monitor controllers. |
| High Output Current | ±37mA min into 600Ω allows direct drive of professional balanced line receivers without external buffer transistors. |
| DC Precision | 0.1mV max input offset voltage and 0.1μV/°C drift ensure <10μV total error over industrial temperature range - critical for DC-coupled active crossovers. |
| Capacitive Load Drive | Stable with up to 100pF load capacitance - eliminates need for isolation resistors when driving ADC inputs or long PCB traces. |
| Short-Circuit Protection | Continuous output short-circuit tolerance prevents latch-up or thermal runaway during fault conditions in powered speaker modules. |
Applications
| Phono Preamplifier | Active Crossover Network |
|---|---|
|
Use Scenario: Amplifying low-level MM cartridge signals (5mV nominal) with RIAA equalization. IC Role / Device Role / Timing Role: Primary gain stage with passive RIAA network; provides 40dB voltage gain and precise zero/pole placement. Use Value: 2.7nV/√Hz noise density preserves vinyl surface noise floor; 0.00003% THD+N avoids harmonic masking of subtle musical transients. |
Use Scenario: Implementing 2nd/4th-order Linkwitz-Riley filters for 3-way loudspeaker systems. IC Role / Device Role / Timing Role: Active filter op-amp in Sallen-Key or state-variable topologies; handles high-Q resonant peaks without peaking. Use Value: 55MHz GBW and ±20V/μs slew rate maintain phase coherence across 20Hz–20kHz; 140dB open-loop gain ensures accurate pole placement. |
| Studio Line Driver | Low-Noise Instrument Preamp |
|
Use Scenario: Driving 100m+ shielded twisted-pair cables to remote monitoring stations. IC Role / Device Role / Timing Role: Balanced output driver with discrete transistor complement replaced by single LME49870MAX/NOPB per channel. Use Value: ±37mA output current sustains 20Vpp into 600Ω load; 120dB PSRR rejects ground-loop induced hum in multi-chassis setups. |
Use Scenario: High-impedance pickup preamplification for electric bass and acoustic guitar with active electronics. IC Role / Device Role / Timing Role: First-stage JFET-input replacement using bipolar topology with lower noise than discrete alternatives. Use Value: 10nA input bias current avoids loading piezo or magnetic pickups; 0.1mV VOS eliminates DC blocking caps in DC-coupled designs. |
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 quiescent current (2.6mA vs 5mA), slightly higher noise (1.1nV/√Hz), 2-channel configuration only. | Preferred in dual-channel line-level stages where board space is constrained and power efficiency is prioritized over ultimate THD+N. | Select OPA1612AIDR when dual-channel integration reduces component count and thermal load is critical; verify layout for cross-talk suppression. |
| AD797ARZ | Higher slew rate (20V/μs same), lower noise (0.9nV/√Hz), but limited output current (±10mA) and no short-circuit protection. | Suitable for ultra-low-noise sensor front-ends or microphone preamps where load is high-impedance (>10kΩ), not for 600Ω line driving. | Choose AD797ARZ only for low-current, high-Z applications; avoid in any design requiring sustained 600Ω drive or fault tolerance. |
Compared with OPA1612AIDR and AD797ARZ, the LME49870MAX/NOPB uniquely combines 0.00003% THD+N, ±37mA output drive, and integrated short-circuit protection - making it the sole option among the three qualified for demanding 600Ω line-driving and high-power active filter roles without external support circuitry.
Availability
LME49870MAX/NOPB is available at Aetrix Electronics and suitable for high-fidelity audio amplification, phono preamplifiers, and professional line drivers requiring stable component supply across production lifecycles.
Supply support for LME49870MAX/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 signal chain components.
The LME49870MAX/NOPB belongs to TI's LME series of ultra-low-distortion audio op-amps, engineered specifically for professional audio equipment, studio monitors, and high-resolution playback systems where sonic transparency is non-negotiable.
FAQ
What is the maximum capacitive load the LME49870MAX/NOPB can drive without instability?
The LME49870MAX/NOPB is specified stable with capacitive loads up to 100pF under unity-gain conditions, as confirmed in the datasheet Figure 93 (Small-Signal Transient Response with CL = 100pF). This eliminates the need for series isolation resistors when driving ADC inputs, long PCB traces, or cable capacitance in line-receiver applications - provided proper power supply decoupling (100nF ceramic + 10μF tantalum) is implemented near pins 4 and 6.
Does the LME49870MAX/NOPB support split-rail operation at ±2.5V for low-power portable audio designs?
Yes, the LME49870MAX/NOPB operates across ±2.5V to ±22V supply ranges, and its electrical characteristics - including THD+N (0.00003%), slew rate (±20V/μs), and output swing - are validated down to ±2.5V per the datasheet's Operating Ratings table. At ±2.5V, it delivers >3.5Vpp output into 10kΩ with <0.0001% THD+N, making it viable for battery-powered headphone amps and portable DAC output stages.
How does the LME49870MAX/NOPB handle 600Ω loads compared to standard audio op-amps?
The LME49870MAX/NOPB delivers ±37mA minimum output current at ±22V supply, enabling full ±20.4V swing into 600Ω loads - a capability exceeding most general-purpose op-amps (e.g., NE5532: ±3.5mA). Its output stage maintains 0.00003% THD+N even under this load, whereas typical op-amps exhibit >0.001% THD+N at similar conditions. This makes LME49870MAX/NOPB uniquely suited for professional balanced line drivers without external emitter followers.
Is the LME49870MAX/NOPB pin-compatible with other TI audio op-amps like the OPA2134?
No, the LME49870MAX/NOPB is not pin-compatible with the OPA2134 or other TI audio op-amps. It uses an 8-pin SOIC package with four NC pins (1, 7, 8) and dedicated V+ (6) and V− (4) rails - unlike the OPA2134's dual-channel 8-pin SOIC with active pins on all positions. Board redesign is required; pin mapping cannot be reused without functional compromise or oscillation risk.
What thermal considerations apply when operating the LME49870MAX/NOPB at ±22V into 600Ω loads?
At ±22V supply and ±37mA output, the LME49870MAX/NOPB dissipates up to 814mW (PD ≈ (44V × 37mA)). With θJA = 145°C/W, junction temperature rise exceeds 118°C above ambient - risking thermal shutdown. Derating is mandatory: limit continuous output current to ≤±20mA or add copper pour (≥1in²) and thermal vias beneath the SOIC pad. The datasheet specifies internal thermal protection activates at TJ = 150°C.
LME49870MAX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Amplifier Type:
- Audio
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 20V/µs
- Gain Bandwidth Product:
- 55 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 10 nA
- Voltage - Input Offset:
- 140 µV
- Current - Supply:
- 5mA
- Current - Output / Channel:
- 37 mA
- Voltage - Supply Span (Min):
- 5 V
- Voltage - Supply Span (Max):
- 44 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LME49870MAX/NOPB FAQ
1.How can I place an order for LME49870MAX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LME49870MAX/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 LME49870MAX/NOPB reliable?
The price and inventory of LME49870MAX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LME49870MAX/NOPB is usually 5 days.
3.What payment methods are accepted for LME49870MAX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LME49870MAX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LME49870MAX/NOPB?
LME49870MAX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LME49870MAX/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 LME49870MAX/NOPB?
For technical support, including LME49870MAX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LME49870MAX/NOPB requirements.
6.How does Aetrix verify that LME49870MAX/NOPB is sourced from the original manufacturer or authorized distributors?
All LME49870MAX/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 LME49870MAX/NOPB meets industry standards.
7.What is the process for return or replacement of LME49870MAX/NOPB?
All LME49870MAX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LME49870MAX/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 LME49870MAX/NOPB part is unused and in its original packaging.
Return procedure for LME49870MAX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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