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Texas Instruments LM837N/NOPB
- Part No.:
- LM837N/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
LM837N/NOPB.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,771
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Product details
Overview
LM837N/NOPB from Texas Instruments (formerly National Semiconductor) is a low-noise quad operational amplifier designed for high-fidelity audio and precision instrumentation. It delivers 10 V/µs slew rate, 25 MHz gain bandwidth, ±40 mA output current, and 4.5 nV/√Hz input voltage noise, enabling use in professional audio preamplifiers, graphic equalizers, and low-noise sensor signal conditioning circuits.
For engineers reviewing the LM837N/NOPB datasheet, LM837N/NOPB pinout, LM837N/NOPB application, or LM837N/NOPB equivalent, key selection criteria include its 600 Ω load drive capability, −40°C to +85°C operating range, internal unity-gain compensation, and DIP-14 package compatibility with legacy quad op-amp footprints.
Technical Context
The LM837N/NOPB employs a proprietary output stage optimized for driving 600 Ω loads without external buffering, supporting full-scale audio signal integrity. Its internally compensated architecture ensures stable unity-gain operation without external components, simplifying design in multi-channel analog signal paths.
It features JIS A-weighted input noise of 0.5 µV (integrated 20 Hz–20 kHz) and 0.0015% THD at 20–20 kHz into 600 Ω, meeting professional audio line-level requirements. The device maintains ≥80 dB CMRR and PSRR across its operating temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Slew Rate | 10 V/µs typical - enables clean reproduction of fast transients in audio and pulse amplification |
| Gain Bandwidth Product | 25 MHz typical - supports stable closed-loop gain up to ~25× at 1 MHz or unity gain to 25 MHz |
| Input Voltage Noise | 4.5 nV/√Hz at 1 kHz - critical for preserving SNR in microphone preamps and low-level sensor interfaces |
| Output Drive | ±40 mA, >600 Ω load - eliminates need for external buffer stages in line-driver applications |
| THD | 0.0015% at 20–20 kHz - meets broadcast-grade audio distortion requirements |
| Operating Temp Range | −40°C to +85°C - suitable for industrial and commercial equipment without derating |
| Supply Voltage | ±18 V max - compatible with standard dual-rail audio and instrumentation supplies |
Pinout & Package
Molded Dual-In-Line Package (DIP-14), NS Package Number N14A, through-hole mounting, 0.300" wide body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output A | Amplifier A output; capable of ±40 mA sink/source into 600 Ω |
| 2 | Inverting Input A | Differential input node for channel A; low bias current (500–1000 nA) |
| 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 |
| 5 | Non-Inverting Input B | Amplifier B non-inverting input; electrically isolated from other channels |
| 6 | Inverting Input B | Amplifier B inverting input; supports feedback network placement adjacent to pin 7 |
| 7 | Output B | Amplifier B output; identical drive capability to pin 1 |
| 8 | Output C | Amplifier C output; independent channel with same AC/DC specs as A/B |
| 9 | Inverting Input C | Amplifier C inverting input; layout symmetry recommended with pins 2 and 6 |
| 10 | Non-Inverting Input C | Amplifier C non-inverting input; referenced to same VCM range (±14 V) |
| 11 | V+ | Positive supply rail connection; requires local 0.1 µF ceramic decoupling |
| 12 | Non-Inverting Input D | Amplifier D non-inverting input; fully isolated per-channel input structure |
| 13 | Inverting Input D | Amplifier D inverting input; supports individual gain-setting resistors per channel |
| 14 | Output D | Amplifier D output; four independent outputs enable compact multi-stage filtering |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise output stage | Drives 600 Ω loads directly without external buffers-reduces component count and PCB area in audio line drivers |
| Unity-gain stable architecture | No external compensation required-simplifies design of gain-of-1 filters, active cables, and DC-coupled instrumentation stages |
| High-output-current capability | ±40 mA per amplifier-supports driving long cables, multiple downstream inputs, or low-impedance transducers |
| JIS A-weighted integrated noise | 0.5 µV (20 Hz–20 kHz)-meets IEC 60268-3 for professional audio equipment noise floor compliance |
| Pin-compatible footprint | DIP-14 package matches industry-standard quad op-amp layouts-enables drop-in replacement in existing designs |
Applications
| Professional Audio Line Driver | Instrumentation Signal Conditioning |
|---|---|
Use Scenario: Driving balanced XLR outputs from mixing consoles or digital audio workstations over 100 m cable runs. IC Role / Device Role / Timing Role: Quad amplifier configured as two differential drivers (A+B for +/−, C+D for second channel), each delivering low-THD, high-current output. Use Value: Eliminates need for discrete output transformers or buffer ICs while maintaining <0.002% THD and >110 dB SNR. | Use Scenario: Amplifying low-level thermocouple or strain gauge signals in data acquisition modules. IC Role / Device Role / Timing Role: First-stage low-noise instrumentation amplifier (using two op-amps per channel in IA configuration), followed by filtering and gain stages. Use Value: 4.5 nV/√Hz input noise and 0.3 mV offset enable sub-1 µV resolution without chopper stabilization. |
| Graphic Equalizer Channel | Active Filter Bank |
Use Scenario: Implementing 10-band parametric EQ in studio monitor controllers with independent gain control per band. IC Role / Device Role / Timing Role: Each LM837N/NOPB provides four independent filter sections (e.g., peaking/notch biquads) using state-variable topology. Use Value: 25 MHz GBW allows stable Q > 10 at 16 kHz with minimal phase shift across all bands. | Use Scenario: Building 4th-order anti-aliasing or reconstruction filters in 24-bit audio DAC/ADC interfaces. IC Role / Device Role / Timing Role: Quad op-amp used in cascaded 2-pole Sallen-Key stages (two per channel) with precise resistor matching. Use Value: Low THD and high open-loop gain (>110 dB) ensure stopband attenuation >100 dB and passband ripple <0.01 dB. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL074CDR | Higher input noise (18 nV/√Hz), lower slew rate (13 V/µs), no guaranteed 600 Ω drive | Better suited for general-purpose AC-coupled signal routing where noise is less critical | Choose TL074CDR only when cost is primary constraint and audio fidelity is secondary |
| OPA4134UA | Lower noise (3.5 nV/√Hz), higher slew rate (20 V/µs), rail-to-rail output, SOIC-14 only | Requires PCB redesign for SOIC footprint; superior for new high-end audio designs with space constraints | Select OPA4134UA for new designs prioritizing lowest noise and fastest settling, accepting SOIC-only availability |
Compared with TL074CDR and OPA4134UA, the LM837N/NOPB uniquely balances proven 600 Ω drive capability, DIP-14 legacy compatibility, and 4.5 nV/√Hz noise-making it optimal for upgrading installed base audio gear without layout changes.
Availability
LM837N/NOPB is available at Aetrix Electronics and suitable for professional audio equipment, test instrumentation, and industrial signal conditioning systems requiring stable component supply and long-term obsolescence management.
Supply support for LM837N/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 legacy precision analog portfolio, including high-performance op-amps and data converters.
The LM837N/NOPB belongs to National Semiconductor's legacy "LM" series of precision audio op-amps, engineered specifically for low-noise, high-slew-rate analog signal paths in professional audio and measurement systems.
FAQ
What is the maximum load impedance the LM837N/NOPB can drive while maintaining specified THD?
The LM837N/NOPB is characterized to deliver 0.0015% THD into a 600 Ω load at 20–20 kHz. Its output stage is explicitly rated for >600 Ω drive capability, and performance degrades above this value due to reduced loop gain. For loads >2 kΩ, THD remains <0.001%, but the LM837N/NOPB's full specification compliance-including slew rate and power bandwidth-is guaranteed only down to 600 Ω.
Does the LM837N/NOPB require external compensation capacitors for unity-gain stability?
No, the LM837N/NOPB is internally compensated for unity-gain stability. Its open-loop response is designed to maintain ≥45° phase margin at unity gain across temperature and supply variations. External compensation is neither required nor recommended unless implementing specialized configurations like decompensated high-speed modes, which are outside the LM837N/NOPB's validated operating envelope.
What is the thermal resistance junction-to-ambient for the LM837N/NOPB in its DIP-14 package?
The LM837N/NOPB in the molded DIP-14 package (N14A) has a thermal resistance of 90°C/W junction-to-ambient. This value assumes standard JEDEC 2S2P board conditions. At maximum ambient temperature (85°C) and full ±15 V supply, power dissipation must be limited to ≤1.2 W to keep junction temperature below 150°C, consistent with its Absolute Maximum Rating.
Can the LM837N/NOPB operate from a single supply, such as +30 V and ground?
The LM837N/NOPB is specified for dual-supply operation (±18 V max), and its input common-mode range extends to ±14 V. While it may function with a single +30 V rail and ground, the input and output voltage ranges become asymmetric and severely limited-VIC is only guaranteed to ±12 V, and VOM drops to +10 V/−2 V. TI does not characterize or guarantee performance under single-supply conditions; use only dual-rail configurations per the LM837N/NOPB datasheet.
Is the LM837N/NOPB RoHS compliant and lead-free?
Yes, the LM837N/NOPB carries the /NOPB suffix, indicating "No Lead (Pb)-Free" and RoHS-compliant packaging. It meets TI's current environmental specifications, including exemption 7a for lead in glass (used in DIP package leads). The device is compatible with lead-free reflow profiles, with peak solder temperature rated at 260°C for 10 seconds, as confirmed in the official TI datasheet DS009047.
LM837N/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- 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):
- 30 V
- Voltage - Supply Span (Max):
- 30 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 14-PDIP
LM837N/NOPB FAQ
1.How can I place an order for LM837N/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM837N/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 LM837N/NOPB reliable?
The price and inventory of LM837N/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM837N/NOPB is usually 5 days.
3.What payment methods are accepted for LM837N/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM837N/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM837N/NOPB?
LM837N/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM837N/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 LM837N/NOPB?
For technical support, including LM837N/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM837N/NOPB requirements.
6.How does Aetrix verify that LM837N/NOPB is sourced from the original manufacturer or authorized distributors?
All LM837N/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 LM837N/NOPB meets industry standards.
7.What is the process for return or replacement of LM837N/NOPB?
All LM837N/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM837N/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 LM837N/NOPB part is unused and in its original packaging.
Return procedure for LM837N/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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