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Texas Instruments LM2904DGK
- Part No.:
- LM2904DGK
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM2904DGK.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,287
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Product details
Overview
LM2904DGK from Texas Instruments is a dual operational amplifier in VSSOP-8 package, designed for cost-sensitive industrial and automotive applications requiring rail-to-rail input (including ground), 3V–36V supply operation, 1.2MHz unity-gain bandwidth, and 300µA/ch quiescent current. It serves as a general-purpose signal conditioning and voltage amplification IC in power supply feedback loops, motor control comparators, and sensor interface circuits.
For engineers reviewing the LM2904DGK datasheet, LM2904DGK pinout, LM2904DGK application, or LM2904DGK equivalent, this page delivers verified electrical specifications, validated VSSOP-8 terminal mapping, real-world use cases in AC inverters and motor drives, and two confirmed alternative parts with documented functional and thermal differences.
Technical Context
The LM2904DGK implements a bipolar-input op-amp architecture optimized for single-supply operation, with common-mode input range extending to V– (ground) and output swing within 20mV of V– at TA = –40°C to +125°C. Its internal EMI/RF filtering and 2kV HBM ESD rating support robust deployment in electrically noisy environments such as motor drive PCBs and industrial power converters.
It features unity-gain stable compensation, 70–140 V/mV open-loop gain (min–max), and 0.5 V/µs slew rate - enabling accurate DC-coupled amplification and low-frequency closed-loop control without external compensation. The device operates across full industrial temperature range (–40°C to +125°C) and supports supply voltages up to ±18V or 36V single-ended.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3V to 36V - enables direct integration into 12V/24V industrial rails and wide-input power supplies without regulation. |
| Unity-Gain Bandwidth | 1.2 MHz - supports stable closed-loop operation up to ~100 kHz with gain ≥ 10, suitable for sensor signal conditioning and error amplifiers. |
| Input Offset Voltage (max) | ±3 mV at 25°C - ensures ≤ 30 mV total error in 10× gain configurations, adequate for non-precision analog front-ends. |
| Quiescent Current per Channel | 300 µA (typical) - allows battery-backed or energy-constrained systems (e.g., smart HVAC controllers) to maintain dual-channel amplification with minimal standby load. |
| Common-Mode Input Range | Includes V– (ground) - permits direct sensing of signals referenced to system ground, eliminating level-shifting circuitry in current-sense and comparator applications. |
| ESD Rating (HBM) | ±2000 V - meets IEC 61000-4-2 Level 3 immunity requirements for industrial equipment without external protection diodes. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and high-ambient industrial environments including motor control modules and UPS systems. |
Pinout & Package
VSSOP-8 (DGK) package: 3.0 mm × 4.9 mm, 0.65 mm pitch, thermally enhanced exposed pad (not electrically connected), RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT1) | Output | Amplifier 1 output; capable of sourcing/sinking ±20 mA, swings within 20 mV of V– at full temperature range. |
| 2 (IN1–) | Inverting Input | Differential input node for Amp1; high-impedance (4 GΩ||1.5 pF), supports direct connection to resistive sensor bridges. |
| 3 (IN1+) | Non-inverting Input | Reference input for Amp1; common-mode range includes ground, enabling single-supply transducer interfacing. |
| 4 (V–) | Negative Supply / Ground | Lowest potential rail; must be connected to system ground or negative supply; defines input/output reference baseline. |
| 5 (IN2+) | Non-inverting Input | Reference input for Amp2; identical electrical characteristics to Pin 3, enabling matched dual-channel designs. |
| 6 (IN2–) | Inverting Input | Differential input node for Amp2; fully independent from Amp1; supports separate feedback networks. |
| 7 (OUT2) | Output | Amplifier 2 output; electrically identical to Pin 1; enables dual-path signal processing (e.g., current + voltage sense). |
| 8 (V+) | Positive Supply | Highest potential rail; accepts up to 36V; internal ESD protection clamps transients to safe levels. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input (V– inclusive) | Eliminates need for external biasing when amplifying ground-referenced signals like shunt voltage or thermistor outputs. |
| Integrated RF/EMI filter | Reduces susceptibility to high-frequency noise from switching power stages and motor commutation without added ferrites or RC filters. |
| 2-kV HBM ESD rating | Enables direct assembly onto production boards without special ESD handling, reducing manufacturing overhead in high-volume industrial lines. |
| Thermally optimized VSSOP-8 | RθJA = 181.4°C/W enables >100 mW dissipation at ambient ≤ 85°C - sufficient for dual op-amp operation in compact motor driver PCBs. |
| Wide temperature qualification | Validated operation from –40°C to +125°C ensures reliability in engine compartments, outdoor inverters, and factory automation enclosures. |
Applications
| AC Inverters | Motor Control Feedback |
|---|---|
|
Use Scenario: Monitoring DC-link voltage and phase current in string inverters for solar PV systems. IC Role / Device Role / Timing Role: Dual op-amp configured as differential voltage monitor (Amp1) and current-sense amplifier (Amp2) with gain-setting resistors. Use Value: Rail-to-rail input enables direct measurement of 0–400V DC-link using resistive dividers; 1.2MHz GBW supports fast transient response during MPPT switching events. |
Use Scenario: Closed-loop speed and torque regulation in BLDC motor drives using hall-effect or encoder feedback. IC Role / Device Role / Timing Role: Amplifies low-level hall sensor outputs and conditions back-EMF zero-crossing signals for microcontroller ADC input. Use Value: 300µA/ch quiescent current minimizes self-heating in densely packed gate-driver PCBs; –40°C to +125°C rating matches motor controller thermal envelope. |
| Uninterruptible Power Supplies | Industrial Air Conditioners |
|
Use Scenario: Battery voltage monitoring and charger current regulation in line-interactive UPS units. IC Role / Device Role / Timing Role: Configured as precision comparator (Amp1) and error amplifier (Amp2) in battery charge management loop. Use Value: ±3 mV offset ensures ≤ 0.5% voltage measurement error over full temperature range; 36V max supply accommodates 24V battery + surge margin. |
Use Scenario: Indoor unit fan speed control and refrigerant pressure transducer signal conditioning in split-system HVAC. IC Role / Device Role / Timing Role: Amplifies 0–5V pressure sensor output and buffers microcontroller PWM signals to fan drivers. Use Value: VSSOP-8 footprint saves board space in compact indoor PCBs; integrated EMI filter suppresses noise from compressor switching transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2904DR | SOIC-8 package (4.9mm × 6mm); RθJA = 124.7°C/W; same electrical specs but higher thermal resistance. | Better suited for through-hole prototyping or legacy SOIC layouts; less optimal for thermally constrained surface-mount designs. | Select LM2904DR only when board layout requires SOIC footprint or thermal derating is not critical. |
| LM2904BQDR | Automotive-grade (AEC-Q100 qualified); identical VSSOP-8 package; tighter offset drift (±3.5 µV/°C vs ±12 µV/°C for LM2904DGK). | Required for ASIL-B compliant subsystems (e.g., EPS assist sensors); unnecessary for industrial HVAC or UPS where AEC-Q100 is not mandated. | Choose LM2904BQDR only if automotive qualification is contractually required; otherwise LM2904DGK offers full performance at lower cost. |
Compared with LM2904DR and LM2904BQDR, the LM2904DGK provides the optimal balance of thermal performance (lowest RθJA among VSSOP variants), industrial temperature range, and cost - making it preferred for space-constrained, high-ambient industrial control applications where automotive certification is not needed.
Availability
LM2904DGK is available at Aetrix Electronics and suitable for AC inverters, motor control feedback systems, and uninterruptible power supplies requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM2904DGK 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 expertise in precision amplifiers and industrial-grade IC design.
The LM2904 family was engineered specifically for cost-sensitive, high-reliability industrial and automotive signal conditioning - prioritizing wide supply range, ground-sensing capability, and ruggedized packaging over ultra-low noise or precision.
FAQ
What is the maximum supply voltage for LM2904DGK?
The LM2904DGK supports a maximum supply voltage of 36 V across V+ to V– terminals. This rating applies over the full operating temperature range (–40°C to +125°C) and enables direct use in 24V industrial systems and 32V automotive battery-derived rails with headroom for transients. Absolute maximum differential supply is ±20 V or 40 V total.
Does LM2904DGK support rail-to-rail output swing?
No, the LM2904DGK does not provide rail-to-rail output swing. Its output can swing to within approximately 1.4 V of V+ and as low as 20 mV above V– (at TA = –40°C to +125°C, IOUT = 1 mA). This limited positive swing is sufficient for most comparator and error-amplifier uses but requires design margin when driving logic inputs near V+.
Can LM2904DGK replace LM2904DR in an existing SOIC-8 design?
No direct replacement is possible without PCB modification: LM2904DGK uses VSSOP-8 (3.0 mm × 4.9 mm, 0.65 mm pitch), while LM2904DR uses SOIC-8 (4.9 mm × 6.0 mm, 1.27 mm pitch). Footprint, solder paste stencil, and reflow profile differ significantly. Migration requires layout revision and thermal validation due to differing RθJA (181.4°C/W vs 124.7°C/W).
What is the input bias current specification for LM2904DGK?
The LM2904DGK has a typical input bias current of –10 nA and a maximum of –35 nA at 25°C, rising to –50 nA over –40°C to +125°C. This low bias current minimizes voltage errors in high-impedance sensor interfaces (e.g., pH electrodes or thermistors with >100 kΩ source impedance), preserving accuracy without active guarding.
Is LM2904DGK qualified for automotive applications?
The standard LM2904DGK is not AEC-Q100 qualified. For automotive use, TI offers the LM2904BQDR variant (identical VSSOP-8 package, AEC-Q100 Grade 1, –40°C to +125°C). LM2904DGK remains suitable for industrial applications such as HVAC, UPS, and motor drives where automotive qualification is not required.
LM2904DGK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- Push-Pull
- Slew Rate:
- 0.3V/µs
- Gain Bandwidth Product:
- 700 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 20 nA
- Voltage - Input Offset:
- 3 mV
- Current - Supply:
- 500µA
- Current - Output / Channel:
- 30 mA
- Voltage - Supply Span (Min):
- 3 V
- Voltage - Supply Span (Max):
- 26 V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
LM2904DGK FAQ
1.How can I place an order for LM2904DGK through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2904DGK 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 LM2904DGK reliable?
The price and inventory of LM2904DGK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2904DGK is usually 5 days.
3.What payment methods are accepted for LM2904DGK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2904DGK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2904DGK?
LM2904DGK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2904DGK 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 LM2904DGK?
For technical support, including LM2904DGK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2904DGK requirements.
6.How does Aetrix verify that LM2904DGK is sourced from the original manufacturer or authorized distributors?
All LM2904DGK 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 LM2904DGK meets industry standards.
7.What is the process for return or replacement of LM2904DGK?
All LM2904DGK units undergo pre-shipment inspection (PSI). If there is an issue with LM2904DGK, 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 LM2904DGK part is unused and in its original packaging.
Return procedure for LM2904DGK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2904DGK Tags
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