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Texas Instruments MC33078DGKT
- Part No.:
- MC33078DGKT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MC33078DGKT.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,788
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Product details
Overview
MC33078DGKT from Texas Instruments is a dual high-speed, low-noise bipolar operational amplifier designed for precision audio and data-signal conditioning. It delivers 7 V/µs slew rate, 16 MHz gain-bandwidth product, 4.5 nV/√Hz input voltage noise, ±15 V dual-supply operation, and 0.002% total harmonic distortion - enabling high-fidelity signal amplification in analog front-ends and instrumentation circuits.
For engineers reviewing the MC33078DGKT datasheet, MC33078DGKT pinout, MC33078DGKT application, or MC33078DGKT equivalent, key selection criteria include its MSOP-8 package footprint, rail-to-rail output swing capability (±14.1 V), symmetrical sink/source current (±29 mA), and compatibility with capacitive loads up to 590 pF without oscillation when properly compensated.
Technical Context
The MC33078DGKT employs a fully differential bipolar input stage with matched NPN transistors, enabling low input offset voltage (0.15 mV typ) and excellent common-mode rejection (100 dB). Its internal compensation ensures stable unity-gain operation with ≥40° phase margin at 100 pF load.
It features symmetrical output drive architecture supporting ±29 mA short-circuit current, large-signal transient response under 1 µs (10–90%), and robust thermal performance (θJA = 172°C/W) in the thermally enhanced MSOP-8 package with exposed pad.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | ±5 V to ±18 V - supports wide-range dual-rail systems including ±12 V industrial supplies and ±15 V test equipment rails |
| Slew Rate | 7 V/µs - enables clean amplification of fast transient signals up to ~1 MHz without slew-induced distortion |
| Gain-Bandwidth Product | 16 MHz - allows stable closed-loop gain ≥100 at 100 kHz for anti-aliasing and active filter stages |
| Input Voltage Noise | 4.5 nV/√Hz @ 1 kHz - critical for low-level sensor signal amplification where noise floor dominates SNR |
| Total Harmonic Distortion | 0.002% @ 3 Vrms, 20 Hz–20 kHz - meets THD requirements for professional audio line drivers and DAC output buffers |
| Output Voltage Swing | ±14.1 V into 10 kΩ - delivers >94% of full rail-to-rail swing, minimizing headroom loss in ±15 V systems |
| Input Offset Voltage | 0.15 mV (typ) - reduces DC error accumulation in multi-stage amplifiers and precision integrators |
Pinout & Package
VSSOP-8 (DGK) package: 3.0 mm × 3.0 mm body, 1.1 mm max height, exposed thermal pad, 0.65 mm pitch, RoHS-compliant NiPdAu lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN1−) | Inverting input of Channel 1 | Differential node for feedback network connection; requires matched trace impedance in high-frequency layouts |
| 2 (IN1+) | Non-inverting input of Channel 1 | High-impedance node (175 kΩ differential resistance); sensitive to PCB leakage and EMI coupling |
| 3 (OUT1) | Output of Channel 1 | Capable of driving ≥2 kΩ loads with <1% overshoot; series resistor recommended for >590 pF capacitive loads |
| 4 (VCC−) | Negative supply rail | Must be decoupled with ≥0.1 µF ceramic capacitor placed ≤2 mm from pin; shared return path affects PSRR |
| 5 (VCC+) | Positive supply rail | Requires independent 0.1 µF + 10 µF local decoupling; asymmetry degrades CMRR by >10 dB |
| 6 (OUT2) | Output of Channel 2 | Electrically isolated from OUT1 but shares thermal substrate; cross-talk <−120 dB at 1 kHz |
| 7 (IN2−) | Inverting input of Channel 2 | Independent of Channel 1 inputs; layout symmetry minimizes inter-channel gain mismatch |
| 8 (IN2+) | Non-inverting input of Channel 2 | Same bias current (300 nA typ) as IN1+; matching critical for differential input stages |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise bipolar input stage | 4.5 nV/√Hz input voltage noise enables sub-10 µV RMS noise floors in 20 kHz bandwidth sensor interfaces |
| High slew rate with symmetrical drive | 7 V/µs rising/falling edges and ±29 mA output current support fast settling in active filters and pulse amplifiers |
| Wide supply range with rail proximity | Operates from ±5 V to ±18 V and delivers output within 1.9 V of either rail - ideal for legacy ±15 V systems |
| Stable unity-gain configuration | Guaranteed ≥40° phase margin with 100 pF load eliminates need for external compensation in most applications |
| Low THD across audio band | 0.002% THD at 3 Vrms ensures transparent signal reproduction in line-level audio distribution and ADC driver stages |
Applications
| Professional Audio Line Driver | High-Speed Data Acquisition Front-End |
|---|---|
Use Scenario: Driving balanced XLR outputs from studio mixing consoles with minimal coloration. IC Role / Device Role / Timing Role: Dual-channel voltage buffer and level shifter, providing gain-of-1 amplification with ultra-low THD. Use Value: 0.002% THD preserves harmonic integrity of mastered audio; ±14.1 V swing delivers full dynamic range into 600 Ω loads. | Use Scenario: Conditioning analog sensor outputs prior to 16-bit SAR ADC sampling at 1 MSPS. IC Role / Device Role / Timing Role: Anti-aliasing filter driver and DC offset nulling amplifier in multi-channel DAQ modules. Use Value: 16 MHz GBW supports 5-pole Butterworth filter design; 4.5 nV/√Hz noise contributes <0.5 LSB error in 16-bit system. |
| Precision Instrumentation Amplifier Core | Industrial Process Control Signal Conditioning |
Use Scenario: Serving as first-stage gain block in three-op-amp INA topology for millivolt-level thermocouple signals. IC Role / Device Role / Timing Role: Low-drift, low-noise input amplifier with matched input bias currents (300 nA typ). Use Value: 0.15 mV input offset and 2 µV/°C drift minimize cold-junction compensation errors over −40°C to +85°C. | Use Scenario: Isolating and scaling 4–20 mA loop signals in PLC analog input modules. IC Role / Device Role / Timing Role: Transimpedance amplifier and output buffer for current-to-voltage conversion. Use Value: ±29 mA output sink/source drives 250 Ω sense resistors while maintaining linearity; 100 dB CMRR rejects common-mode noise on long field wiring. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NE5532DR | Higher input bias current (800 nA max), lower slew rate (9 V/µs), same 8-pin SOIC/DGK footprint | Better suited for high-current headphone drivers; less optimal for low-noise sensor front-ends | Select NE5532DR only when output drive >±35 mA is required and input noise <5 nV/√Hz is acceptable |
| OPA2134PA | FET-input (50 pA IIB), lower noise (8 nV/√Hz), higher cost, DIP-8/SOIC-8 only - no DGK variant | Preferred for ultra-high-impedance pH electrode interfaces; not pin-compatible with MC33078DGKT | Choose OPA2134PA when input bias current must be <100 pA and board space allows SOIC-8 rework |
Compared with NE5532DR and OPA2134PA, the MC33078DGKT offers superior noise performance (4.5 nV/√Hz vs. 5 nV/√Hz and 8 nV/√Hz) and tighter input offset (0.15 mV vs. 1 mV and 0.5 mV), making it optimal for precision audio and low-level analog signal chains where MSOP-8 footprint is constrained.
Availability
MC33078DGKT is available at Aetrix Electronics and suitable for professional audio equipment, industrial data acquisition systems, and precision instrumentation requiring stable component supply across extended temperature ranges (−40°C to +85°C).
Supply support for MC33078DGKT 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 over 90 years of innovation in high-reliability analog ICs.
The MC33078DGKT belongs to TI's legacy high-performance op-amp family, engineered specifically for demanding audio, measurement, and control applications where low noise, high speed, and DC precision coexist.
FAQ
What is the maximum capacitive load the MC33078DGKT can drive without oscillation?
The MC33078DGKT remains stable with up to 590 pF capacitive load when configured with 10 kΩ load resistance, as verified in TI's pulse response characterization. For loads exceeding this value - such as LCD bias networks or long cable drivers - a 10–47 Ω series resistor must be added between the output pin and the capacitance to restore phase margin. This behavior is documented in Figure 2 of the MC33078DGKT datasheet under "Output Characteristics".
Does the MC33078DGKT support single-supply operation?
The MC33078DGKT is specified for dual-supply operation from ±5 V to ±18 V and does not support true single-supply use. Its input common-mode range extends to within 1.9 V of either rail, but the input stage requires both positive and negative supplies to function correctly. Attempting single-supply operation (e.g., 0 V and +30 V) violates absolute maximum ratings and risks latch-up or permanent damage to the MC33078DGKT.
What is the thermal resistance (θJA) of the MC33078DGKT in its VSSOP-8 package?
The MC33078DGKT has a junction-to-ambient thermal resistance (θJA) of 172°C/W in the standard VSSOP-8 (DGK) package, as measured per JESD 51-7 with no copper pour or thermal vias. With a 25 mm² exposed pad connected to ≥1 in² internal ground plane via ≥4 thermal vias, θJA improves to ≤65°C/W - a critical design factor for sustained 2.5 mA per channel operation at +85°C ambient.
Is the MC33078DGKT pin-compatible with other members of the MC33078 family?
Yes, the MC33078DGKT shares identical pinout and electrical characteristics with all MC33078 variants (e.g., MC33078DR, MC33078P) across SOIC-8, PDIP-8, and VSSOP-8 packages. The DGK package uses the same 1–8 pin numbering scheme shown in the top-view diagram: IN1−, IN1+, OUT1, VCC−, VCC+, OUT2, IN2−, IN2+. No PCB redesign is needed when migrating from SOIC to VSSOP, provided land pattern matches TI's DGK0008A outline.
What is the open-loop AC gain of the MC33078DGKT at 20 kHz?
The MC33078DGKT delivers 800 V/V (58 dB) open-loop AC gain at 20 kHz under ±15 V supply conditions, as specified in the "Electrical Characteristics" table. This high gain retention enables precise closed-loop behavior in active filters and servo loops operating near audio upper limits, and exceeds the 200 V/V typical of general-purpose op-amps like LM358 at the same frequency.
MC33078DGKT 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:
- -
- Slew Rate:
- 7V/µs
- Gain Bandwidth Product:
- 16 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 300 nA
- Voltage - Input Offset:
- 150 µV
- Current - Supply:
- 2.05mA (x2 Channels)
- Current - Output / Channel:
- 37 mA
- Voltage - Supply Span (Min):
- 10 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
MC33078DGKT FAQ
1.How can I place an order for MC33078DGKT through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33078DGKT 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 MC33078DGKT reliable?
The price and inventory of MC33078DGKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33078DGKT is usually 5 days.
3.What payment methods are accepted for MC33078DGKT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33078DGKT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33078DGKT?
MC33078DGKT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33078DGKT 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 MC33078DGKT?
For technical support, including MC33078DGKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33078DGKT requirements.
6.How does Aetrix verify that MC33078DGKT is sourced from the original manufacturer or authorized distributors?
All MC33078DGKT 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 MC33078DGKT meets industry standards.
7.What is the process for return or replacement of MC33078DGKT?
All MC33078DGKT units undergo pre-shipment inspection (PSI). If there is an issue with MC33078DGKT, 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 MC33078DGKT part is unused and in its original packaging.
Return procedure for MC33078DGKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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