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Texas Instruments MC33078D
- Part No.:
- MC33078D
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MC33078D.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:611
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Product details
Overview
MC33078D 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, ±14.6 V output swing (±15 V supply), and 0.002% total harmonic distortion at 20 Hz–20 kHz - enabling high-fidelity signal amplification in analog front-ends and instrumentation circuits.
For engineers reviewing the MC33078D datasheet, MC33078D pinout, MC33078D application, or MC33078D equivalent, this page provides verified package mapping (SOIC-8), validated dual-channel op-amp functionality, confirmed rail-to-rail-capable output swing under load, and real-world noise and distortion performance metrics critical for low-distortion audio preamps and sensor signal chains.
Technical Context
The MC33078D implements a fully differential, dual-channel bipolar input stage with symmetrical sink/source drive capability and no deadband crossover distortion. Its architecture supports stable unity-gain operation with ≥40° phase margin (CL = 100 pF) and maintains >85 dB open-loop AC gain at 20 kHz across –40°C to 85°C.
It operates from dual supplies of ±5 V to ±18 V (36 V total), features ±13 V common-mode input range, and achieves 120 kHz power bandwidth at 27 VPP into 2 kΩ with THD ≤1%. Input bias current remains below 800 nA over temperature, and amp-to-amp isolation exceeds –120 dB (20 Hz–20 kHz).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Slew Rate | 7 V/µs - enables clean amplification of fast transient signals up to ~1 MHz without slewing-induced distortion. |
| Gain-Bandwidth Product | 16 MHz - supports stable closed-loop gain of 100 at 160 kHz or gain of 10 at 1.6 MHz. |
| Input Voltage Noise | 4.5 nV/√Hz @ 1 kHz - critical for low-noise microphone preamps and precision sensor interfaces. |
| Total Harmonic Distortion | 0.002% @ 3 Vrms, AV = 1, 20 Hz–20 kHz - meets high-fidelity audio requirements for studio-grade line drivers. |
| Output Voltage Swing | ±14.1 V to ±14.6 V @ ±15 V supply into 2 kΩ - delivers >94% of rail-to-rail swing, minimizing headroom loss. |
| Input Offset Voltage | 0.15 mV (typ), 3 mV (max) over –40°C to 85°C - ensures DC accuracy in precision transducer amplifiers. |
| Common-Mode Rejection | 80–100 dB - rejects power-supply ripple and shared-noise coupling in differential measurement setups. |
Pinout & Package
MC33078D is housed in an 8-pin SOIC (D) package per JEDEC MS-012, variation AA, with 1.27 mm pitch, 3.91 mm body width, and 1.75 mm max height. Pin 1 is located at the top-left corner with notch or beveled edge marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT1 | Amplifier 1 output - drives external load; capable of ±29 mA source/sink current. |
| 2 | IN1− | Inverting input of Amp 1 - accepts feedback network or inverted signal path. |
| 3 | IN1+ | Non-inverting input of Amp 1 - connects to reference, sensor, or signal source. |
| 4 | VCC− | Negative supply rail - must be connected to system ground or negative voltage (–5 V to –18 V). |
| 5 | VCC+ | Positive supply rail - connects to +5 V to +18 V; decoupling capacitor required near pin. |
| 6 | OUT2 | Amplifier 2 output - independent channel output; identical specs to OUT1. |
| 7 | IN2− | Inverting input of Amp 2 - used for second signal path or feedback configuration. |
| 8 | IN2+ | Non-inverting input of Amp 2 - supports dual-channel instrumentation or stereo audio paths. |
Key Features
| Feature | Design Value |
|---|---|
| Dual high-speed amplification | Two fully independent op-amps in one SOIC-8 package - reduces board space and inter-channel skew in stereo or differential systems. |
| Low-noise bipolar input stage | 4.5 nV/√Hz voltage noise + 0.5 pA/√Hz current noise - optimal for medium-source-impedance sensors (≤10 kΩ). |
| Large symmetrical output swing | ±14.6 V into 10 kΩ with ±15 V supply - eliminates need for rail-splitting or level-shifting in single-supply-constrained designs. |
| Stable unity-gain operation | ≥40° phase margin with 100 pF load - allows direct use in voltage-follower configurations without external compensation. |
| Wide dual-supply range | Operates from ±5 V to ±18 V - supports legacy industrial rails (±12 V, ±15 V) and battery-powered ±5 V systems. |
Applications
| Professional Audio Preamp | Industrial Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Low-noise amplification of dynamic microphone or line-level signals in mixing consoles and audio interfaces. IC Role / Device Role / Timing Role: Dual-channel voltage amplifier with selectable gain (1–100), configured as non-inverting preamp and active filter stage. Use Value: 0.002% THD and 4.5 nV/√Hz noise preserve signal integrity across full 20 Hz–20 kHz bandwidth without audible artifacts. |
Use Scenario: Amplifying millivolt-level outputs from strain gauges, thermocouples, or RTDs in PLC analog input modules. IC Role / Device Role / Timing Role: Precision instrumentation amplifier front-end with matched dual channels for differential sensing and offset correction. Use Value: 0.15 mV typical input offset and 80–100 dB CMRR reject common-mode noise from long sensor cables in electrically noisy factory environments. |
| Test & Measurement Equipment | Medical ECG Front-End |
|
Use Scenario: Signal buffering and gain staging in portable oscilloscope vertical amplifiers and arbitrary waveform generator outputs. IC Role / Device Role / Timing Role: High-slew-rate buffer (7 V/µs) driving 50 Ω or 1 MΩ loads with minimal overshoot and settling time <1 µs. Use Value: 16 MHz GBW and ≥40° phase margin ensure faithful reproduction of fast edges and square waves up to 100 kHz. |
Use Scenario: Biopotential amplification in portable ECG monitors requiring ultra-low noise and high DC accuracy. IC Role / Device Role / Timing Role: First-stage gain block with high input impedance (>175 kΩ) and low input bias current (<800 nA) to minimize electrode polarization error. Use Value: 0.5 pA/√Hz input current noise prevents baseline drift and motion artifact amplification in dry-electrode or high-impedance electrode configurations. |
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 vs. 300 nA typ), slightly lower slew rate (9 V/µs), same 16 MHz GBW and 5 nV/√Hz noise. | Better suited for higher-source-impedance audio circuits where bias current is less critical than voltage noise. | Select NE5532DR when prioritizing proven audio lineage and wider availability; verify input bias impact on high-Z sensor nodes. |
| OPA2134PA | FET-input (vs. bipolar), lower input bias current (1 pA), higher cost, 8 MHz GBW, 8 nV/√Hz noise - trades voltage noise for bias current. | Ideal for ultra-high-impedance pH probes or piezoelectric sensors where leakage current dominates error budget. | Choose OPA2134PA only when input bias current <10 pA is mandatory; accept 50% bandwidth reduction and higher unit cost. |
Compared with NE5532DR and OPA2134PA, the MC33078D offers the best balance of low voltage noise (4.5 nV/√Hz), moderate input bias current (300 nA typ), and wide supply range (±5 V to ±18 V) for cost-sensitive industrial and pro-audio signal chains requiring both precision and robustness.
Availability
MC33078D is available at Aetrix Electronics and suitable for professional audio equipment, industrial sensor interfaces, and test & measurement instruments requiring stable component supply with consistent parametric performance across temperature and lot variations.
Supply support for MC33078D 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 high-performance op-amps and precision signal-chain solutions.
The MC33078D belongs to TI's legacy high-speed bipolar op-amp family, engineered specifically for demanding analog applications where low noise, wide bandwidth, and large output swing are essential - particularly in audio, instrumentation, and industrial control systems.
FAQ
What is the maximum load capacitance the MC33078D can drive without oscillation?
The MC33078D remains stable with up to 380 pF capacitive load when driving a 600 Ω load, 560 pF into 2 kΩ, and 590 pF into 10 kΩ. Oscillation onset varies by lot; for loads exceeding these values, adding a small series resistor (e.g., 10–50 Ω) between the output and capacitive load restores stability without degrading bandwidth significantly. This behavior is documented in Figure 2 of the MC33078D datasheet.
Does the MC33078D support single-supply operation?
Yes, the MC33078D supports single-supply operation with VCC+ = +10 V and VCC− = 0 V (ground), provided the input common-mode voltage stays within ±13 V of the midpoint between supplies - i.e., 0 V to +10 V range centered at +5 V. For true rail-to-rail input, external level-shifting or biasing is required since the inputs do not extend to either rail. The MC33078D datasheet specifies VICR = ±13 V relative to VCC± midpoint.
What is the thermal resistance (θJA) of the MC33078D in SOIC-8 package?
The MC33078D in SOIC-8 (D) package has a junction-to-air thermal resistance (θJA) of 97°C/W under standard JEDEC PCB mounting conditions (2-layer board, 1 in² copper). This value assumes no internal thermal pad connection; actual thermal performance improves with added copper pour and thermal vias beneath the exposed pad area if present in layout. The MC33078D datasheet lists this in the Absolute Maximum Ratings table.
How does the MC33078D compare to the MC33078DR.A variant?
The MC33078D and MC33078DR.A share identical electrical specifications, pinout, and SOIC-8 package. The "DR.A" suffix denotes tape-and-reel packaging (2500 units/reel) with NIPDAU lead finish and Level-1 moisture sensitivity rating, while "MC33078D" refers to the base part number used in ordering documentation. Both are functionally interchangeable; MC33078DR.A is the active production version currently shipped by Texas Instruments.
Is the MC33078D RoHS compliant?
Yes, the MC33078D is RoHS compliant, as confirmed in TI's Packaging Information document (11-Nov-2025 addendum), which lists "Yes" under RoHS for all active SOIC-8 variants including MC33078DR.A. It uses lead-free NIPDAU (nickel/palladium/gold) terminal finish and meets EU Directive 2011/65/EU requirements without exemptions.
MC33078D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- -
- Slew Rate:
- 7V/µs
- Gain Bandwidth Product:
- 15 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-SOIC
MC33078D FAQ
1.How can I place an order for MC33078D through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33078D 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 MC33078D reliable?
The price and inventory of MC33078D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33078D is usually 5 days.
3.What payment methods are accepted for MC33078D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33078D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33078D?
MC33078D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33078D 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 MC33078D?
For technical support, including MC33078D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33078D requirements.
6.How does Aetrix verify that MC33078D is sourced from the original manufacturer or authorized distributors?
All MC33078D 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 MC33078D meets industry standards.
7.What is the process for return or replacement of MC33078D?
All MC33078D units undergo pre-shipment inspection (PSI). If there is an issue with MC33078D, 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 MC33078D part is unused and in its original packaging.
Return procedure for MC33078D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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