LM2904BQDGKRQ1 Selection Guide: Automotive Dual Op-Amp Variants, Packages, and Alternatives
How to choose the right LM2904BQ automotive dual op-amp variant: AEC-Q100 grade, offset voltage, package, and non-automotive alternatives explained.
Last updated: May 2026
Bottom Line: When selecting an automotive-grade dual op-amp for in-vehicle applications, the three most critical considerations are AEC-Q100 qualification tier (Grade 1 for –40 °C to +125 °C operation), supply voltage range to match your ECU rail (3 V to 36 V for LM2904B-series), and package/footprint compatibility for high-volume PCB assembly. The LM2904BQDGKRQ1 in the 8-VSSOP package covers all three while offering 1.2 MHz gain-bandwidth product and a tight input offset voltage of ±3 mV max—making it a direct drop-in for ADAS, body-control, and powertrain sensor-conditioning circuits.
What Is the LM2904BQDGKRQ1?
The LM2904BQDGKRQ1 is a Texas Instruments industry-standard dual operational amplifier designed specifically for automotive systems. It carries AEC-Q100 Grade 1 qualification, ensuring reliable operation from –40 °C to +125 °C ambient. The device integrates two independent, internally frequency-compensated amplifiers on a single die and ships in the compact 8-VSSOP (DGKR) footprint—ideal for space-constrained automotive PCB designs.
Key electrical highlights from the TI datasheet:
- Supply voltage range: 3 V to 36 V single-supply, or ±1.5 V to ±18 V dual-supply
- Gain-bandwidth product (GBP): 1.2 MHz typical
- Input offset voltage (VOS): ±3 mV maximum (improved over legacy LM2904 ±7 mV)
- Supply current per amplifier: 0.5 mA typical at 5 V
- Input common-mode voltage range: includes ground (V–) rail, enabling single-supply operation
The "Q1" suffix confirms AEC-Q100 automotive qualification, and "DGKR" identifies the 8-VSSOP package in tape-and-reel form for automated pick-and-place assembly. You can find stocked units and competitive pricing for the LM2904BQDGKRQ1 through FindMyChip's 200+ verified distributors.
Key Selection Parameters for Automotive Dual Op-Amps
1. AEC-Q100 Grade and Temperature Range
AEC-Q100 is the JEDEC-derived qualification standard for automotive semiconductor reliability. Grade 1 (–40 °C to +125 °C) is the minimum for most underhood and passenger-compartment applications; Grade 0 (–40 °C to +150 °C) is reserved for extreme underhood locations. The LM2904BQDGKRQ1 is Grade 1, which covers:
- Body Control Modules (BCM)
- ADAS radar/camera signal conditioning
- Battery Management System (BMS) cell-voltage sensing
- Climate control and HVAC actuator drivers
Always confirm the "Q1" suffix in the part number. A non-Q1 variant—such as the LM2904BIDGKR (industrial, –40 °C to +125 °C)—may pass the same temperature range on a bench but lacks the formal PPAP/DFMEA documentation required for Tier-1 automotive supply chains.
2. Supply Voltage Range and Single-Supply Compatibility
Automotive ECUs operate from a wide range of rails: 3.3 V for MCU I/O sensing, 5 V for legacy sensors, 12 V for actuator drive, and up to 36 V for load-dump transients. The LM2904B-series handles 3 V to 36 V, which spans all standard 12 V system rails including ISO 16750-2 load-dump up to 36 V (with external protection). Its rail-to-rail-output-compatible input common-mode range (V– to V+ − 1.5 V) allows single-supply configurations where the non-inverting input rides near ground—critical for current-sensing and low-side analog front-end designs.
3. Input Offset Voltage and Bias Current
Offset voltage (VOS) directly limits measurement accuracy in sensor-conditioning chains. The LM2904BQDGKRQ1 specifies VOS ≤ ±3 mV max, a 2.3× improvement over the original LM2904 ±7 mV. For a gain-of-10 amplifier stage, this translates to ≤ 30 mV output error—acceptable for 8-bit ADC resolution but tight for 12-bit. When 12-bit or higher precision is required, consider chopper-stabilized alternatives (VOS < 25 µV). Input bias current is 250 nA max, which with a 100 kΩ source resistance introduces a ±25 mV additional offset—factor this into your error budget.
4. Gain-Bandwidth Product (GBP) and Slew Rate
GBP of 1.2 MHz (typical) with a slew rate of 0.5 V/µs means the LM2904BQDGKRQ1 suits DC to audio-frequency signal chains (e.g., 0–20 kHz sensor outputs, CAN bus wake-up filters, or battery current integration). For ultrasonic parking sensors operating at 40–80 kHz or LiDAR transimpedance amplifiers, you need parts with GBP ≥ 10 MHz. The trade-off is quiescent current: higher-GBP op-amps typically draw 1–5 mA per channel versus 0.5 mA here—important in always-on standby circuits fed from a 12 V battery.
5. Package and Footprint for High-Volume Assembly
The DGKR suffix denotes the 8-VSSOP package (2.0 × 2.0 mm body, 0.65 mm pitch), the smallest in the LM2904BQ family. Alternative packages in the Q1 grade include:
- SOIC-8 (DR) – LM2904BQDRQ1: 3.9 × 4.9 mm, easier to rework, lower placement cost
- TSSOP-8 (PWR) – LM2904BQPWRQ1: 3.0 × 4.4 mm, midpoint between SOIC and VSSOP
- VSSOP-8 (DGKR) – LM2904BQDGKRQ1: optimal for board-space-constrained modules
All three are electrically identical; package choice is driven by PCB density requirements, reflow profile (VSSOP requires tighter paste printing tolerances), and repair-ability.
6. Variants and Upgrade Path Within the LM2904BQ Family
Texas Instruments offers several LM2904BQ variants that share the same footprint and pinout, enabling drop-in upgrades:
| Part Number | Temp Range | AEC Grade | Package | VOS Max | GBP |
|---|---|---|---|---|---|
| LM2904BQDGKRQ1 | –40 to +125 °C | Grade 1 | 8-VSSOP | ±3 mV | 1.2 MHz |
| LM2904BAQDGKRQ1 | –40 to +125 °C | Grade 1 | 8-VSSOP | ±2 mV | 1.2 MHz |
| LM2904BTQDGKRQ1 | –40 to +125 °C | Grade 1 | 8-VSSOP | ±1 mV | 1.2 MHz |
| LM2904BQDRQ1 | –40 to +125 °C | Grade 1 | SOIC-8 | ±3 mV | 1.2 MHz |
| LM2904BQPWRQ1 | –40 to +125 °C | Grade 1 | TSSOP-8 | ±3 mV | 1.2 MHz |
The "A" suffix (LM2904BA) indicates tighter offset (±2 mV max) and the "T" suffix (LM2904BT) adds extended –40 °C to +150 °C operation for the most demanding underhood locations. If your current design uses the LM2904BQDGKRQ1 and future revisions need lower offset, swap in the BAQDGKRQ1 with no PCB changes.
7. Non-Automotive Alternatives for Industrial and Consumer Designs
If your application does not require AEC-Q100 qualification, broader options become available. The LM2904BIDGKR is the industrial-temperature (–40 °C to +125 °C) VSSOP-8 variant with identical electrical specs but lower cost. The LM358ADGKR from TI is a close relative—also a dual op-amp in VSSOP-8—suitable for commercial-temperature (0 °C to +70 °C) applications. For a generic industry-standard replacement across multiple vendors, the LM358 family (IDCHIP, ST, TI) in SOP-8 provides maximum supply flexibility with minimal qualification overhead.
Recommended Products Comparison Table
| Product | AEC Grade | VOS Max | Supply Range | Package | Best For |
|---|---|---|---|---|---|
| LM2904BQDGKRQ1 | Q100 Grade 1 | ±3 mV | 3–36 V | 8-VSSOP | Automotive general-purpose, BCM, ADAS |
| LM2904BAQDGKRQ1 | Q100 Grade 1 | ±2 mV | 3–36 V | 8-VSSOP | Precision automotive sensor conditioning |
| LM2904BTQDGKRQ1 | Q100 Grade 1 | ±1 mV | 3–36 V | 8-VSSOP | Underhood high-temp + precision |
| LM2904BQDRQ1 | Q100 Grade 1 | ±3 mV | 3–36 V | SOIC-8 | Automotive, easier rework |
| LM2904BIDGKR | Industrial | ±3 mV | 3–36 V | 8-VSSOP | Industrial/non-automotive cost-down |
Selection Decision Flowchart
Use this decision tree to select the right variant for your design:
Step 1 – Is AEC-Q100 required?
- Yes → proceed to Step 2
- No → use LM2904BIDGKR (industrial) or LM358ADGKR (commercial)
Step 2 – Is operating temperature > +125 °C?
- Yes → use LM2904BTQDGKRQ1 (Grade 1, –40 °C to +150 °C)
- No → proceed to Step 3
Step 3 – What offset voltage is acceptable?
- VOS ≤ ±3 mV → LM2904BQDGKRQ1 (cost-optimized, most widely stocked)
- VOS ≤ ±2 mV → LM2904BAQDGKRQ1 (one tier up, same package)
- VOS ≤ ±1 mV → LM2904BTQDGKRQ1 (highest precision automotive)
Step 4 – PCB space constraint?
- Tight (< 4 mm²) → VSSOP-8 (DGKR suffix)
- Standard → SOIC-8 (DR suffix) or TSSOP-8 (PWR suffix)
Step 5 – Sourcing strategy?
- Single-source qualified → confirm stocked at 2+ distributors via FindMyChip search
- Long-term supply security → request a quote for bonded inventory at FindMyChip
Application Examples
Battery Current Sensing in a BMS
In a 12 V/48 V BMS, two LM2904BQDGKRQ1 channels can sense across a 10 mΩ shunt resistor in a differential configuration. At 10 A load, the shunt develops 100 mV; with the op-amp biased at gain 20, the output is 2 V—well within the 12 V ADC input range. The ±3 mV VOS introduces a worst-case 60 mV output error, equivalent to ±3 A on the current reading—acceptable for state-of-charge estimation at 10-bit resolution.
ADAS Camera Power-Management Fault Detection
In an ADAS domain ECU, one LM2904BQDGKRQ1 channel functions as a window comparator monitoring the 12 V camera supply rail. The two amplifier outputs connect to an OR-gate input on the SoC's GPIO, generating a fault interrupt when the supply drifts outside 11–13 V. This leverages the op-amp's rail-to-rail-output-compatible input range and its ability to source/sink output currents up to 40 mA.
Ambient-Light Sensor Signal Conditioning
Body-control modules use ambient-light sensors to auto-adjust dashboard illumination. A single LM2904BQDGKRQ1 channel provides transimpedance amplification for a photodiode (10 MΩ feedback resistor → 10 µA full-scale current gives 100 mV output) and the second channel acts as a unity-gain buffer driving the MCU ADC pin. The low supply current (1 mA total for both channels) keeps always-on standby power within ISO 11820 limits.
FAQ
Q: What does the "Q1" suffix mean on the LM2904BQDGKRQ1? The "Q1" suffix indicates AEC-Q100 automotive qualification, meaning the device has passed a defined stress test protocol (including high-temperature operating life, thermal shock, and humidity testing) per the AEC-Q100 standard from the Automotive Electronics Council. This qualification is required by most Tier-1 automotive suppliers and OEMs for electronic components used in vehicle systems. It also implies the part ships with PPAP documentation support.
Q: Can I replace an LM2904 (non-Q1) with an LM2904BQDGKRQ1? Yes, provided your PCB layout uses the same VSSOP-8 or a compatible package. The LM2904BQDGKRQ1 is electrically pin-compatible with the standard LM2904 but offers improved offset voltage (±3 mV vs. ±7 mV) and AEC-Q100 Grade 1 qualification. No schematic changes are needed for a like-for-like replacement; confirm your supply voltage is within 3–36 V.
Q: What is the difference between LM2904B and LM2904BA? The "A" suffix (LM2904BA) specifies a tighter maximum input offset voltage—±2 mV versus ±3 mV for the standard LM2904B. Both are AEC-Q100 Grade 1 qualified, share the same pinout, package options, and supply range. Choose the "A" version when your error budget requires better DC accuracy, such as in precision battery voltage monitoring or thermocouple conditioning.
Q: How does the LM2904BQDGKRQ1 compare to the LM358 for automotive use? The LM358 is a classic dual op-amp with a commercial temperature range (0 °C to +70 °C) and no AEC-Q100 qualification—making it unsuitable for automotive applications requiring –40 °C operation or formal qualification documents. The LM2904BQDGKRQ1 operates to –40 °C, is AEC-Q100 Grade 1 qualified, and has a lower VOS max (±3 mV vs. ±5 mV for standard LM358). For any automotive design file, the LM2904BQDGKRQ1 is the correct replacement for a legacy LM358.
Q: Where can I source the LM2904BQDGKRQ1 with guaranteed authenticity? FindMyChip connects buyers to 200+ verified distributors that carry the LM2904BQDGKRQ1 with full traceability. All distributors in our network pass a 5-point authentication check, and competitive pricing is available within 24 hours. Use FindMyChip search to compare live stock across authorized and independent distributors, or submit a quote request for volume orders with lead-time commitments.
Conclusion
The LM2904BQDGKRQ1 is the optimal starting point for automotive dual op-amp selection when AEC-Q100 Grade 1, 8-VSSOP footprint, and wide supply range (3–36 V) are required. Its improved ±3 mV offset and 1.2 MHz GBP cover the majority of body-control, BMS, and ADAS sensor-conditioning applications. For tighter precision, step up to the LM2904BAQDGKRQ1 (±2 mV) or LM2904BTQDGKRQ1 (±1 mV, 150 °C). For non-automotive industrial designs, the LM2904BIDGKR provides the same performance without Q1 cost premium.
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