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Analog Devices Inc./Maxim Integrated MAX412BEPA
- Part No.:
- MAX412BEPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX412BEPA.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:305
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Product details
Overview
MAX412BEPA from Maxim Integrated is a dual, precision, low-noise operational amplifier in an 8-pin plastic DIP package, rated for -40°C to +85°C operation. It delivers 2.4nV/√Hz input voltage-noise density at 1kHz, 28MHz unity-gain bandwidth, and 4.5V/µs slew rate while consuming only 2.5mA per amplifier from ±2.4V to ±5V supplies. It is used in ultra-low-noise instrumentation amplifiers and infrared detector front-ends.
For engineers reviewing the MAX412BEPA datasheet, MAX412BEPA pinout, MAX412BEPA application, or MAX412BEPA equivalent, this page provides verified electrical parameters, thermal performance across industrial temperature range, dual-amplifier channel separation (135dB at 1kHz), and design guidance for capacitive-load driving up to 3900pF without external compensation.
Technical Context
The MAX412BEPA employs a bipolar input stage optimized for low voltage noise, achieving <2.4nV/√Hz at 1kHz by balancing high input-stage collector current against bias and current-noise trade-offs. Its architecture supports rail-to-rail output swing of ±3.6V into 2kΩ with ±5V supplies and maintains unity-gain stability without external compensation.
It features matched dual channels with 135dB channel separation at 1kHz, 115dB minimum open-loop voltage gain, and guaranteed CMRR ≥105dB over -40°C to +85°C. Input protection uses back-to-back clamp diodes only-no series current-limiting resistors-to preserve noise performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Noise Density | 2.4nV/√Hz max at 1kHz - enables sub-µV signal amplification in precision sensor interfaces |
| Unity-Gain Bandwidth | 28MHz - supports wideband signal conditioning up to ~10MHz with minimal phase error |
| Slew Rate | 4.5V/µs - ensures faithful reproduction of fast transients in audio and measurement systems |
| Supply Current per Amp | 2.5mA - allows dual-channel low-noise amplification within tight power budgets |
| Input Offset Voltage | ±400µV max over -40°C to +85°C - supports DC-coupled applications requiring stable baseline |
| CMRR | 105dB min over full temp range - rejects common-mode interference in bridge and differential sensor circuits |
| Operating Supply Range | ±2.4V to ±5.25V - enables flexible dual-supply use in battery-powered or mixed-voltage systems |
Pinout & Package
MAX412BEPA is housed in an 8-pin plastic DIP (dual in-line package) with 0.3-inch body width and through-hole mounting. Pin 1 is marked with a notch or dot; the package is RoHS-compliant and rated for industrial temperature operation (-40°C to +85°C).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | IN1− (inverting input, Amp 1) | High-impedance differential input node; requires matched source impedance for optimal CMRR |
| 2 | IN1+ (non-inverting input, Amp 1) | High-impedance differential input node; referenced to V− for offset null configuration |
| 3 | OUT1 (output, Amp 1) | Capable of ±3.6V swing into 2kΩ; stable driving 3900pF in unity-gain configuration |
| 4 | V− (negative supply) | Must be connected to system negative rail; TDFN variant requires exposed paddle tied to V− |
| 5 | V+ (positive supply) | Accepts +2.4V to +5.25V; PSRR ≥90dB ensures immunity to supply ripple |
| 6 | IN2− (inverting input, Amp 2) | Independent second channel input; 135dB channel separation prevents crosstalk in dual-path designs |
| 7 | IN2+ (non-inverting input, Amp 2) | Second channel non-inverting input; identical AC/DC specs to IN1+ across temperature |
| 8 | OUT2 (output, Amp 2) | Dual-output capability enables independent signal paths or differential output stages |
Key Features
| Feature | Design Value |
|---|---|
| Low 1/f noise corner | 90Hz - minimizes drift and low-frequency interference in precision DC measurements |
| No internal input current-limiting resistors | Preserves 2.4nV/√Hz noise floor - unlike many op amps, avoids added thermal noise from series resistors |
| Stability with large capacitive loads | Drives 3900pF in unity-gain follower without oscillation - eliminates need for external isolation resistors in many layouts |
| Matched dual-channel performance | 135dB channel separation at 1kHz - critical for dual-path instrumentation, chopper-assisted topologies, and differential receivers |
| Wide supply flexibility | Operates from ±2.4V to ±5.25V - supports legacy ±5V rails and newer low-voltage industrial systems |
Applications
| Low-Noise Frequency Synthesizers | Infrared Detectors |
|---|---|
Use Scenario: Amplifying low-level IF signals in PLL-based synthesizer loop filters where phase noise must be minimized. IC Role / Device Role / Timing Role: Dual-channel op amp configured as active loop filter integrator and buffer, leveraging matched channels for symmetry. Use Value: 2.4nV/√Hz noise density directly limits integrated phase jitter; 28MHz bandwidth accommodates fast lock times without peaking. |
Use Scenario: Front-end amplification of photodiode current from cooled IR detectors operating in low-light conditions. IC Role / Device Role / Timing Role: Transimpedance amplifier (TIA) stage with low input bias current (±130nA max) and ultra-low voltage noise. Use Value: Enables detection of sub-picoamp photocurrents; 115dB voltage gain ensures sufficient dynamic range before ADC digitization. |
| High-Quality Audio Amplifiers | Ultra Low-Noise Instrumentation Amplifiers |
Use Scenario: Line-level preamplifier stage in studio-grade analog audio equipment requiring THD+N < -94dB. IC Role / Device Role / Timing Role: Dual op amp implementing non-inverting gain stage and active filter, exploiting low distortion and wide bandwidth. Use Value: 4.5V/µs slew rate prevents slew-induced distortion on 20kHz sine waves; 135dB channel separation preserves stereo imaging. |
Use Scenario: First-stage gain block in medical ECG or strain-gauge Wheatstone bridge signal chains. IC Role / Device Role / Timing Role: Dual op amp wired as precision difference amplifier with external 42.2kΩ gain-setting resistors. Use Value: ±400µV max offset over temperature ensures stable DC baseline; 105dB CMRR rejects 60Hz mains pickup in unshielded environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual low-noise op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA211AIDR | Lower voltage noise (1.1nV/√Hz), but higher supply current (3.6mA per amp); SO-8 only, no DIP option | Better for ultra-low-noise DC-coupled systems; less suitable for legacy through-hole designs or space-constrained DIP footprints | Select OPA211AIDR when voltage noise is paramount and PCB layout permits SO-8; retain MAX412BEPA for through-hole assembly or industrial temp DIP requirement |
| LT1028ACN8#PBF | Higher bandwidth (50MHz), but wider offset spec (±125µV typ), no guaranteed -40°C to +85°C performance, DIP-8 package | Preferred for high-speed RF/IF applications; not recommended for precision DC or wide-temp industrial use | Choose LT1028ACN8#PBF for speed-critical AC-coupled designs; MAX412BEPA remains superior for stable DC gain and guaranteed industrial temperature operation |
Compared with OPA211AIDR and LT1028ACN8#PBF, the MAX412BEPA uniquely balances ultra-low noise, dual-channel matching, industrial temperature rating, and through-hole DIP packaging-making it the only option meeting all three requirements simultaneously in legacy or ruggedized systems.
Availability
MAX412BEPA is available at Aetrix Electronics and suitable for low-noise instrumentation, infrared sensing, and high-fidelity audio applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX412BEPA 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
Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and consumer markets.
The MAX410/MAX412/MAX414 family was designed specifically for precision, low-noise signal conditioning in measurement, sensor interface, and audio systems where voltage noise, bandwidth, and DC accuracy must coexist under constrained supply conditions.
FAQ
What is the maximum capacitive load the MAX412BEPA can drive without oscillation?
The MAX412BEPA remains stable driving up to 3900pF in unity-gain voltage-follower configuration, as confirmed in the Typical Operating Characteristics (Figure 6a/b). This eliminates need for external isolation resistors in most sensor buffering applications. For loads exceeding 3900pF, a 10Ω series resistor at the output restores phase margin, as shown in Figure 7a.
Does the MAX412BEPA support single-supply operation?
Yes, the MAX412BEPA supports single-supply operation down to 4.8V total supply (e.g., 0V and +4.8V). Input common-mode range extends to V− + 1.5V and V+ − 1.5V; output swing is specified from V− + 1.3V to V+ − 1.4V into 2kΩ. Performance is guaranteed by design and PSRR testing across the full ±2.4V to ±5.25V range.
What is the guaranteed input offset voltage specification for MAX412BEPA over temperature?
The MAX412BEPA guarantees ±400µV maximum input offset voltage over its full operating temperature range of -40°C to +85°C, as documented in the Electrical Characteristics table for TA = -40°C to +85°C. This is tighter than the ±450µV limit for the quad MAX414BEPA variant.
How does the MAX412BEPA achieve low noise without input current-limiting resistors?
The MAX412BEPA omits series input current-limiting resistors to avoid adding thermal noise-instead relying solely on back-to-back clamp diodes for ±0.1V differential input protection. This preserves the 2.4nV/√Hz voltage-noise density. External 20mA current limiting is required if differential inputs exceed ±1.0V, per Absolute Maximum Ratings Note 1.
Is the MAX412BEPA pin-compatible with other op amps in the same DIP-8 footprint?
The MAX412BEPA follows industry-standard dual-op-amp pinout (IN1−, IN1+, OUT1, V−, V+, IN2−, IN2+, OUT2), matching LM358, TL072, and OP270 pin assignments. However, due to differences in bias current, noise, and bandwidth, direct functional replacement requires validation of loop stability and noise performance in the target circuit.
MAX412BEPA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- -
- Slew Rate:
- 4.5V/µs
- Gain Bandwidth Product:
- 28 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 80 nA
- Voltage - Input Offset:
- 120 µV
- Current - Supply:
- 2.5mA (x2 Channels)
- Current - Output / Channel:
- 35 mA
- Voltage - Supply Span (Min):
- 4.8 V
- Voltage - Supply Span (Max):
- 10.5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX412BEPA FAQ
1.How can I place an order for MAX412BEPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX412BEPA 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 MAX412BEPA reliable?
The price and inventory of MAX412BEPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX412BEPA is usually 5 days.
3.What payment methods are accepted for MAX412BEPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX412BEPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX412BEPA?
MAX412BEPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX412BEPA 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 MAX412BEPA?
For technical support, including MAX412BEPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX412BEPA requirements.
6.How does Aetrix verify that MAX412BEPA is sourced from the original manufacturer or authorized distributors?
All MAX412BEPA 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 MAX412BEPA meets industry standards.
7.What is the process for return or replacement of MAX412BEPA?
All MAX412BEPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX412BEPA, 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 MAX412BEPA part is unused and in its original packaging.
Return procedure for MAX412BEPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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