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Texas Instruments LM3900DR
- Part No.:
- LM3900DR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM3900DR.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,795
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Product details
Overview
LM3900DR from Texas Instruments is a quadruple Norton (current-differencing) operational amplifier optimized for single-supply operation across 4.5 V to 32 V, delivering 2.5 MHz unity-gain bandwidth, ±6 mA short-circuit output current, and rail-to-rail output swing up to 29.5 V with 30 V supply - widely used in industrial sensor signal conditioning and automotive body control modules.
For engineers reviewing the LM3900DR datasheet, LM3900DR pinout, LM3900DR application, or LM3900DR equivalent, this page provides verified electrical parameters, SOIC-14 package mapping, temperature-limited operating range (0°C to 70°C), and functional alternatives for legacy analog designs requiring high input impedance and robust output drive under asymmetric supply conditions.
Technical Context
The LM3900DR implements four independent current-input amplifiers using a constant-current generator architecture, where differential input currents are mirrored to produce output voltage via external feedback resistors - eliminating need for input bias current cancellation networks. Its inverting-input topology inherently supports ground-referenced inputs even with single supply.
Each amplifier features internal frequency compensation, output short-circuit protection, and clamp diodes limiting negative input swing to ≈–0.3 V. Input bias current remains stable at ≤300 nA over full temperature range, and mirror gain stays within 0.9–1.1 µA/µA with <5% variation across –40°C to 85°C (LM2900) or 0°C to 70°C (LM3900).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 4.5 V to 32 V single supply; enables direct interface with 5 V, 12 V, and 24 V industrial rails without level-shifting. |
| Unity-Gain Bandwidth | 2.5 MHz - supports medium-speed transducer signal amplification and active filter design up to ~200 kHz. |
| Input Bias Current | ≤300 nA max over full temp range - minimizes offset drift in high-impedance sensor front-ends (e.g., pH electrodes, photodiode TIA). |
| Output Short-Circuit Current | –6 mA to –10 mA - delivers robust drive into low-Z loads while limiting thermal stress during fault conditions. |
| Operating Temperature | 0°C to 70°C - qualified for commercial and non-critical industrial environments, distinct from LM2900's –40°C to 85°C grade. |
| Large-Signal Voltage Gain | 1.2–2.8 V/mV (1200–2800 V/V) - provides sufficient open-loop gain for precision DC amplification with <0.1% error at 100× closed-loop gain. |
| Supply Current (4 amps) | 6.2–10 mA - enables low-power multi-channel analog monitoring in battery-backed systems with predictable quiescent draw. |
Pinout & Package
LM3900DR is housed in a 14-pin SOIC (D package), 3.9 mm wide, RoHS-compliant, moisture-sensitive level-1 device rated for reflow at 260°C peak. Pin spacing is 1.27 mm; package outline conforms to JEDEC MS-012.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | 1IN+ | Noninverting input of Amplifier 1 - accepts current-mode signal; clamped ≥–0.3 V below ground. |
| 2 | 1IN– | Inverting input of Amplifier 1 - primary current-differencing node; drives output via external feedback resistor. |
| 3 | 1OUT | Output of Amplifier 1 - capable of sourcing/sinking up to ±6 mA; swing reaches within 0.2 V of GND and 0.5 V of VCC. |
| 4 | 2IN– | Inverting input of Amplifier 2 - electrically identical to Pin 2; shares no internal coupling with other amplifiers. |
| 5 | 2IN+ | Noninverting input of Amplifier 2 - referenced to same common-mode bias as Pin 1; requires external current biasing for ground-level operation. |
| 6 | 2OUT | Output of Amplifier 2 - independently buffered; supports simultaneous multi-channel signal processing without crosstalk. |
| 7 | GND | Ground reference terminal - serves as return path for all four amplifiers and must be low-impedance to avoid common-mode noise coupling. |
| 8 | VCC | Positive supply rail - powers all four amplifiers; decoupling capacitor (0.1 µF) required within 1 cm for stability. |
| 9 | 3IN+ | Noninverting input of Amplifier 3 - identical function to Pins 1 and 5; supports daisy-chained or isolated configurations. |
| 10 | 3IN– | Inverting input of Amplifier 3 - main current-summing node; connects to feedback network determining gain and bandwidth. |
| 11 | 3OUT | Output of Amplifier 3 - rail-to-rail swing enables direct driving of ADC reference buffers or LED drivers. |
| 12 | 4IN– | Inverting input of Amplifier 4 - fully independent; allows four separate current-mode signal paths on one IC. |
| 13 | 4IN+ | Noninverting input of Amplifier 4 - biased externally to set common-mode operating point; critical for single-supply DC accuracy. |
| 14 | 4OUT | Output of Amplifier 4 - supports high-current sink capability (up to 5 mA at VOL = 1 V) for active pull-down applications. |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation down to 4.5 V | Eliminates dual-rail power design complexity in cost-sensitive embedded systems such as HVAC controllers and smart meters. |
| Internal frequency compensation | Guarantees stable unity-gain operation without external compensation components - reduces BOM count and layout area. |
| Output short-circuit protection | Prevents latch-up or thermal runaway during wiring faults or load misconnections in field-deployed equipment. |
| Low input bias current (≤300 nA) | Maintains accuracy in high-source-impedance applications like piezoelectric sensor interfaces and electrochemical sensors. |
| Wide bandwidth (2.5 MHz) | Supports fast transient response in motor current sensing and PWM-based analog signal reconstruction. |
Applications
| Industrial Sensor Interface | Automotive Body Control |
|---|---|
Use Scenario: Amplifying low-level mV outputs from RTD, thermocouple, or strain gauge bridges in programmable logic controllers. IC Role / Device Role / Timing Role: Norton op-amp configured as current-input instrumentation amplifier with external gain-setting resistors. Use Value: Enables direct single-supply operation with ground-referenced inputs, avoiding level-shifters and reducing component count by 30% vs. bipolar op-amp solutions. | Use Scenario: Driving window lift motors, seat position sensors, and door lock actuators in 12 V vehicle architectures. IC Role / Device Role / Timing Role: Quad amplifier used for analog signal conditioning, current sensing, and H-bridge gate biasing. Use Value: Delivers ±6 mA output drive and rail-swing capability compatible with 12 V battery transients, improving system reliability under load dump conditions. |
| Power Supply Monitoring | Legacy Analog Test Equipment |
Use Scenario: Real-time monitoring of DC bus voltage and current in UPS and solar charge controllers. IC Role / Device Role / Timing Role: Configured as voltage-controlled current source/sink for isolated feedback loop interfacing. Use Value: Provides linear current output proportional to sensed voltage - simplifies optocoupler-driven isolation without external DACs. | Use Scenario: Replacing obsolete discrete op-amp stages in vintage oscilloscope vertical amplifiers and function generators. IC Role / Device Role / Timing Role: Drop-in quad amplifier supporting classic Norton-based circuit topologies from 1970s–1990s test gear schematics. Use Value: Matches original LM3900 pinout, gain, and slew rate behavior - eliminates redesign risk when repairing or refurbishing legacy instruments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-differencing amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2900DR | Wider temperature range (–40°C to 85°C); otherwise identical electrical specs and pinout. | Suitable for extended-temperature industrial and automotive under-hood applications where LM3900DR's 0°C–70°C limit is insufficient. | Select LM2900DR when ambient operating temperature may fall below 0°C or exceed 70°C; otherwise LM3900DR offers lower cost and same functionality. |
| TLV2464IDR | Rail-to-rail input/output CMOS op-amp; 6.4 MHz GBW; 750 nA input bias; no current-input architecture. | Requires redesign of feedback network; not drop-in - suited for voltage-input applications needing higher precision and lower noise than Norton topology. | Choose TLV2464IDR only when migrating from current-mode to voltage-mode signal chains; LM3900DR remains optimal for existing Norton-based circuits. |
Compared with LM2900DR, LM3900DR trades extended temperature capability for cost efficiency in commercial-grade systems; versus TLV2464IDR, it preserves legacy Norton circuit compatibility but lacks rail-to-rail input and higher bandwidth - making LM3900DR the preferred choice for maintaining proven analog signal paths without layout changes.
Availability
LM3900DR is available at Aetrix Electronics and suitable for industrial sensor interface, automotive body control, and legacy analog test equipment requiring stable component supply and long-term obsolescence mitigation.
Supply support for LM3900DR 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, embedded processing, and digital signal technologies, with over 90 years of innovation in foundational analog ICs.
The LM3900DR belongs to TI's legacy general-purpose op-amp product line, designed specifically for current-differencing applications in single-supply industrial and commercial systems where input bias current and ground-referenced operation are critical.
FAQ
What is the maximum supply voltage rating for LM3900DR?
The LM3900DR has an absolute maximum supply voltage of 36 V, but its recommended operating range is 4.5 V to 32 V for reliable performance. Operation above 32 V risks exceeding safe power dissipation limits in the SOIC-14 package, especially at elevated ambient temperatures. Always observe derating curves from the datasheet's Dissipation Rating Table when designing for continuous operation near upper voltage limits. The LM3900DR maintains specified electrical characteristics across its full 4.5–32 V range.
Does LM3900DR support dual-supply operation?
Yes, the LM3900DR supports dual-supply operation with VCC+ ranging from 2.2 V to 16 V and VCC– from –2.2 V to –16 V. However, its internal architecture is optimized for single-supply use - the inverting input functions as a current-summing node referenced to ground, and common-mode biasing must be applied externally for dual-rail DC accuracy. Unlike voltage-input op-amps, the LM3900DR does not require symmetrical supplies to achieve full output swing.
What is the input voltage range limitation at the inverting input of LM3900DR?
The inverting input of LM3900DR is not rail-to-rail; it is internally clamped to approximately –0.3 V below ground to prevent damage from negative transients. Input currents must be externally limited to ≤–1 mA to avoid output degradation, and sustained negative currents >–4 mA force the output to a low-voltage state. This behavior is inherent to the Norton current-differencing architecture and applies identically across all four amplifiers in the LM3900DR.
How does LM3900DR differ from LM2900DR in terms of temperature specification?
The LM3900DR is characterized for operation from 0°C to 70°C, whereas the LM2900DR is rated for –40°C to 85°C. All other electrical specifications - including supply range, bandwidth, input bias current, and output drive - are identical between the two parts. The LM3900DR is intended for commercial-grade applications where extended temperature tolerance is unnecessary, offering cost and inventory advantages in those use cases.
Can LM3900DR replace LM324 in existing designs?
No, LM3900DR cannot directly replace LM324 because they use fundamentally different architectures: LM3900DR is a current-differencing (Norton) amplifier with current-mode inputs, while LM324 is a voltage-input op-amp. Swapping them requires complete redesign of feedback networks, biasing, and signal routing. LM3900DR is interchangeable only with other Norton-type amplifiers like LM2900 or original National Semiconductor LM3900 - not with voltage-input op-amps such as LM324, TL074, or MCP6004.
LM3900DR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 4
- Output Type:
- -
- Slew Rate:
- 20V/µs
- Gain Bandwidth Product:
- 2.5 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 30 nA
- Voltage - Input Offset:
- -
- Current - Supply:
- 6.2mA (x4 Channels)
- Current - Output / Channel:
- 10 mA
- Voltage - Supply Span (Min):
- 4.4 V
- Voltage - Supply Span (Max):
- 32 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
LM3900DR FAQ
1.How can I place an order for LM3900DR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3900DR 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 LM3900DR reliable?
The price and inventory of LM3900DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3900DR is usually 5 days.
3.What payment methods are accepted for LM3900DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3900DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3900DR?
LM3900DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3900DR 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 LM3900DR?
For technical support, including LM3900DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3900DR requirements.
6.How does Aetrix verify that LM3900DR is sourced from the original manufacturer or authorized distributors?
All LM3900DR 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 LM3900DR meets industry standards.
7.What is the process for return or replacement of LM3900DR?
All LM3900DR units undergo pre-shipment inspection (PSI). If there is an issue with LM3900DR, 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 LM3900DR part is unused and in its original packaging.
Return procedure for LM3900DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3900DR Tags
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