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Texas Instruments LM837M/NOPB
- Part No.:
- LM837M/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM837M/NOPB.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,918
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Product details
Overview
LM837M/NOPB from Texas Instruments (formerly National Semiconductor) is a low-noise, high-speed quad operational amplifier with 25 MHz gain bandwidth, 10 V/µs slew rate, and 4.5 nV/√Hz input voltage noise. It drives 600 Ω loads and is used in professional audio preamplifiers, graphic equalizers, and instrumentation requiring <0.0015% THD at 20 kHz.
For engineers reviewing the LM837M/NOPB datasheet, LM837M/NOPB pinout, LM837M/NOPB application, or LM837M/NOPB equivalent, key selection criteria include output drive capability into 600 Ω, unity-gain stability, low 0.3 mV input offset voltage, and −40°C to +85°C operating range for industrial audio signal conditioning.
Technical Context
The LM837M/NOPB features an internally compensated unity-gain-stable architecture with a 25 MHz gain-bandwidth product and 10 V/µs slew rate, enabling wideband small-signal amplification up to 200 kHz power bandwidth. Its output stage delivers ±40 mA into resistive loads while maintaining low distortion.
It achieves 4.5 nV/√Hz input voltage noise at 1 kHz and 0.7 pA/√Hz input current noise, with CMRR and PSRR both ≥80 dB across supply variations. Input common-mode range extends to ±14 V with ±15 V supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 25 MHz typical - supports stable closed-loop gain ≥1 up to 25 MHz or gain = 10 up to 2.5 MHz |
| Slew Rate | 10 V/µs typical - enables clean 20 kHz full-scale sine output without slewing distortion |
| Input Voltage Noise | 4.5 nV/√Hz at 1 kHz - critical for low-noise microphone and sensor front-end amplification |
| THD + N | 0.0015% at 20–20 kHz, 3 Vrms, 600 Ω load - meets professional audio fidelity requirements |
| Output Drive | ±40 mA, >600 Ω load - directly interfaces with line-level audio circuits without external buffers |
| Input Offset Voltage | 0.3 mV max - minimizes DC error in precision DC-coupled gain stages |
| Supply Range | ±18 V absolute max, ±15 V recommended - compatible with standard dual-rail audio power supplies |
Pinout & Package
LM837M/NOPB is housed in a 14-pin SOIC (Small Outline Integrated Circuit) package per NS package code M14A, with standard quad op-amp pinout and thermal pad omitted.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output A | Inverting amplifier output for Channel A; capable of ±12.5 V swing into 600 Ω |
| 2 | Inverting Input A | Differential input node for Channel A; 500–1000 nA bias current |
| 3 | Non-Inverting Input A | Differential input node for Channel A; matched to Pin 2 for common-mode rejection |
| 4 | V− | Negative supply rail connection; must be decoupled locally for noise immunity |
| 5 | Non-Inverting Input B | Channel B positive input; electrically isolated from other channels |
| 6 | Inverting Input B | Channel B negative input; supports independent feedback network |
| 7 | Output B | Channel B output; identical AC/DC specs to Pin 1 |
| 8 | Output C | Channel C output; fully independent, no crosstalk beyond −120 dB (20–20 kHz) |
| 9 | Inverting Input C | Channel C negative input; referenced to same V− as all channels |
| 10 | Non-Inverting Input C | Channel C positive input; matched pair with Pin 9 |
| 11 | V+ | Positive supply rail; requires local 0.1 µF ceramic bypass capacitor |
| 12 | Non-Inverting Input D | Channel D positive input; supports four independent gain blocks in one IC |
| 13 | Inverting Input D | Channel D negative input; enables individual feedback per channel |
| 14 | Output D | Channel D output; maintains 0.0015% THD under same load conditions as other outputs |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stable architecture | Internally compensated - eliminates need for external compensation capacitors in gain = 1 configurations |
| 600 Ω load drive capability | ±12.5 V output swing into 600 Ω - directly drives professional audio line inputs without buffer stages |
| Low 4.5 nV/√Hz input noise | Enables high-fidelity amplification of weak signals (e.g., phono cartridges, condenser mic preamps) without added noise floor |
| −120 dB input-referred crosstalk | Prevents inter-channel signal leakage in multi-channel audio routing or simultaneous instrumentation measurements |
| 0.3 mV max input offset voltage | Reduces DC error accumulation in multi-stage DC-coupled audio or sensor signal chains |
Applications
| Professional Audio Preamplifier | Graphic Equalizer Channel |
|---|---|
Use Scenario: Amplifying low-level microphone or instrument signals before analog-to-digital conversion in studio-grade audio interfaces. IC Role / Device Role / Timing Role: Primary low-noise voltage amplifier stage with DC-coupled input and 600 Ω line-driver output. Use Value: 4.5 nV/√Hz noise floor preserves signal integrity; 0.0015% THD ensures transparent reproduction up to 20 kHz. | Use Scenario: Implementing band-selective gain control in parametric EQ modules for live sound mixing consoles. IC Role / Device Role / Timing Role: Four independent op-amp sections provide simultaneous filter summing, buffering, and output driving per frequency band. Use Value: −120 dB crosstalk prevents frequency band bleed; ±40 mA output drives multiple parallel filter paths. |
| Instrumentation Signal Conditioning | Medical Sensor Front-End |
Use Scenario: Amplifying and filtering low-amplitude biopotential or strain gauge signals in portable test equipment. IC Role / Device Role / Timing Role: Precision DC-coupled gain block with low offset drift (2 µV/°C) and high CMRR (>80 dB). Use Value: 0.3 mV max VOS and 80 dB CMRR suppress common-mode interference from noisy industrial environments. | Use Scenario: Conditioning ECG or EEG electrode signals prior to isolation and digitization in patient monitoring systems. IC Role / Device Role / Timing Role: First-stage low-noise amplifier with high input impedance and rail-to-rail output swing capability. Use Value: 4.5 nV/√Hz noise and 25 MHz GBW support accurate acquisition of sub-mV physiological waveforms with minimal distortion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA4134UA | Lower 3.2 nV/√Hz noise, higher 8 MHz GBW, but only ±20 mA output drive | Better for ultra-low-noise mic preamps; insufficient for 600 Ω line driving without external buffer | Select when noise is primary constraint and load impedance ≥2 kΩ |
| TL074CDR | Higher 18 nV/√Hz noise, lower 3 mA output drive, 3 MHz GBW | Cost-optimized for non-critical audio; cannot meet 0.0015% THD or 600 Ω drive specs | Select only for budget-sensitive consumer audio where THD <0.01% is acceptable |
Compared with OPA4134UA and TL074CDR, LM837M/NOPB uniquely balances low noise (4.5 nV/√Hz), high output current (±40 mA), and 600 Ω drive capability - making it the only option among the three qualified for professional line-level audio output stages without added components.
Availability
LM837M/NOPB is available at Aetrix Electronics and suitable for professional audio equipment, test instrumentation, medical sensor interfaces, and industrial signal conditioning requiring stable component supply and long-term lifecycle support.
Supply support for LM837M/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 acquired National Semiconductor in 2011 and maintains its precision analog portfolio, including legacy high-performance op-amps.
The LM837M/NOPB belongs to National Semiconductor's professional audio op-amp family, designed specifically for low-noise, high-fidelity signal amplification in demanding analog audio and measurement systems.
FAQ
What is the maximum load impedance the LM837M/NOPB can drive while maintaining specified THD?
The LM837M/NOPB is characterized for 0.0015% THD at 20–20 kHz into a 600 Ω load with ±15 V supplies. Driving higher impedances (e.g., 2 kΩ or 10 kΩ) further improves THD, but the 600 Ω rating confirms its suitability for professional line-level audio interfaces. The LM837M/NOPB maintains ±12.5 V output swing under this condition, meeting AES3 and EBU standards for analog audio distribution.
Is the LM837M/NOPB pin-compatible with other industry-standard quad op-amps?
Yes, the LM837M/NOPB uses the standard 14-pin SOIC pinout defined for quad op-amps (M14A package), matching pin assignments of LM324, TL074, and OPA4134. This allows direct replacement in existing PCB layouts without modification, provided thermal and electrical design margins accommodate its higher supply current (15 mA typical for all four amps) and output drive capability.
Does the LM837M/NOPB require external compensation for unity-gain operation?
No, the LM837M/NOPB is internally compensated for stable unity-gain operation. Its open-loop phase margin is 45°, and it exhibits no peaking or oscillation when configured as a voltage follower or non-inverting amplifier with gain = 1. External compensation is unnecessary and not recommended unless specific bandwidth limiting is required for EMI suppression.
What is the input common-mode voltage range for the LM837M/NOPB at ±15 V supplies?
At ±15 V supplies, the LM837M/NOPB supports an input common-mode voltage range of ±14.0 V (minimum) per the datasheet's DC Electrical Characteristics table. This allows full-rail input operation with ≤1 V headroom, enabling DC-coupled designs in audio and instrumentation where signal offsets must be preserved across amplification stages.
How does the LM837M/NOPB's noise performance compare to general-purpose quad op-amps like the LM324?
The LM837M/NOPB delivers 4.5 nV/√Hz input voltage noise at 1 kHz - over 5× lower than the LM324's ~16 nV/√Hz. This difference directly impacts dynamic range in low-level signal amplification: in a 20 kHz bandwidth, LM837M/NOPB adds ≈0.6 µV RMS noise versus ≈2.3 µV for LM324. That makes LM837M/NOPB appropriate for microphone preamps and sensor interfaces where signal amplitudes are sub-millivolt.
LM837M/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 4
- Output Type:
- -
- Slew Rate:
- 10V/µs
- Gain Bandwidth Product:
- 25 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 500 nA
- Voltage - Input Offset:
- 300 µV
- Current - Supply:
- 10mA (x4 Channels)
- Current - Output / Channel:
- 40 mA
- Voltage - Supply Span (Min):
- 36 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
LM837M/NOPB FAQ
1.How can I place an order for LM837M/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM837M/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 LM837M/NOPB reliable?
The price and inventory of LM837M/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM837M/NOPB is usually 5 days.
3.What payment methods are accepted for LM837M/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM837M/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM837M/NOPB?
LM837M/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM837M/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 LM837M/NOPB?
For technical support, including LM837M/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM837M/NOPB requirements.
6.How does Aetrix verify that LM837M/NOPB is sourced from the original manufacturer or authorized distributors?
All LM837M/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 LM837M/NOPB meets industry standards.
7.What is the process for return or replacement of LM837M/NOPB?
All LM837M/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM837M/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 LM837M/NOPB part is unused and in its original packaging.
Return procedure for LM837M/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM837M/NOPB 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
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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
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LM2902DR
Texas Instruments
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LM358P
Texas Instruments
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