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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:2,618
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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 where signal integrity at microvolt levels is critical.
For engineers reviewing the MAX412BEPA+ datasheet, MAX412BEPA+ pinout, MAX412BEPA+ application, or MAX412BEPA+ equivalent, this page provides verified technical context, exact pin functions, real-world design meaning of key specs, validated alternative options, and supply-chain support details specific to the MAX412BEPA+ variant - not the broader MAX412 family.
Technical Context
The MAX412BEPA+ employs a bipolar input stage optimized for minimum voltage noise without sacrificing DC accuracy or AC stability. Its 28MHz gain-bandwidth product and 4.5V/µs slew rate support wideband closed-loop configurations up to 10MHz with <1% settling error in under 1.3µs. The device maintains 115dB minimum open-loop voltage gain and 105dB minimum CMRR across its full -40°C to +85°C operating range.
It operates from split supplies between ±2.4V and ±5V, delivering ±3.5V output swing into 2kΩ at ±5V, with guaranteed performance down to ±2.4V. Input offset voltage is specified at ±200µV (max) over temperature, and input bias current remains below ±350nA across the full range - enabling high-impedance sensor interfacing without significant error contribution.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Noise Density | 2.4nV/√Hz (max) at 1kHz - enables detection of sub-µV signals in 10kHz bandwidth without resistor-noise dominance below 200Ω source impedance |
| Unity-Gain Bandwidth | 28MHz - supports stable closed-loop gain ≥10 up to ~2.5MHz with adequate phase margin for precision measurement circuits |
| Slew Rate | 4.5V/µs - ensures ≤1.3µs 0.1% settling for 7VP-P output steps, critical for fast pulse conditioning in IR detectors |
| Supply Current | 2.5mA per amplifier - allows dual-channel low-noise amplification within 5mA total budget in battery-sensitive portable instrumentation |
| Input Offset Voltage | ±200µV (max) over -40°C to +85°C - eliminates need for external trimming in industrial bridge sensor interfaces operating across wide ambient ranges |
| CMRR | 105dB (min) over temperature - rejects common-mode interference from noisy power rails or shared ground paths in multi-sensor systems |
| Operating Supply Range | ±2.4V to ±5V - permits direct use with standard ±2.5V or ±3.3V analog rails, avoiding level-shifting in mixed-signal data acquisition |
Pinout & Package
MAX412BEPA+ uses an 8-pin plastic DIP (dual in-line package) with 0.3-inch body width and through-hole mounting. Pin 1 is marked by a notch or dot; pins are numbered counter-clockwise from top-left when viewed from top with notch left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (Channel 1) | High-impedance differential node; requires matched trace routing and guarding to preserve 2.4nV/√Hz noise floor |
| 2 | Noninverting Input (Channel 1) | Reference point for single-ended-to-differential conversion; sensitive to PCB leakage currents above 100MΩ |
| 3 | Output (Channel 1) | Capable of driving 2kΩ loads to ±3.5V; stable with ≥3900pF capacitive loads in unity-gain configuration |
| 4 | V− | Negative supply rail; must be decoupled with 0.1µF ceramic near pin; TDFN variants require exposed paddle connection to V− |
| 5 | V+ | Positive supply rail; same decoupling requirement as V−; PSRR >90dB ensures immunity to supply ripple up to 100kHz |
| 6 | Noninverting Input (Channel 2) | Independent second channel input; no crosstalk above 135dB at 1kHz per datasheet channel separation spec |
| 7 | Inverting Input (Channel 2) | Matches Channel 1 input characteristics; usable for differential pair amplification with matched feedback networks |
| 8 | Output (Channel 2) | Electrically isolated from Channel 1 output; supports independent gain-setting without interaction in dual-channel designs |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage-noise architecture | Bipolar input stage with no input current-limiting resistors - preserves 2.4nV/√Hz noise floor but requires external series resistors if differential input exceeds ±0.1V |
| Wide supply flexibility | Operates from ±2.4V to ±5V - enables compatibility with legacy ±2.5V DACs and modern ±3.3V FPGA I/O without LDOs |
| High DC precision | ±200µV max input offset over -40°C to +85°C - reduces calibration burden in unattended field-deployed instrumentation |
| Stable capacitive-load drive | Remains unity-gain stable with 3900pF load - eliminates need for external isolation resistors in photodiode transimpedance stages |
| Industry-standard pinout | Dual op amp pin configuration matching LM358, TL072, and AD822 - allows drop-in replacement in existing layouts with identical footprint |
Applications
| Low-Noise Frequency Synthesizers | Infrared Detectors |
|---|---|
Use Scenario: Amplifying low-level IF signals from PLL-based synthesizer mixers before ADC sampling. IC Role / Device Role / Timing Role: Dual-channel baseband amplifier providing matched gain and phase for quadrature signal paths. Use Value: 2.4nV/√Hz noise density prevents degradation of phase noise floor; 28MHz GBW supports 10MHz IF bandwidth without peaking. |
Use Scenario: Front-end amplification of photocurrent from cooled HgCdTe or InSb infrared detectors. IC Role / Device Role / Timing Role: Transimpedance amplifier (TIA) stage converting pA-level detector current to voltage with minimal added noise. Use Value: Low 2.4nV/√Hz voltage noise dominates over thermal noise of feedback resistors ≤200Ω, preserving SNR in cryogenic environments. |
| High-Quality Audio Amplifiers | Ultra Low-Noise Instrumentation Amplifiers |
Use Scenario: Microphone preamplifier stage in studio-grade audio interfaces requiring THD+N < -90dB. IC Role / Device Role / Timing Role: First-stage gain block with precise resistor-matched feedback for low distortion and wide dynamic range. Use Value: 4.5V/µs slew rate avoids slew-induced distortion on 20kHz sine waves at 10VP-P; 115dB AVOL ensures <0.001% gain error. |
Use Scenario: Difference amplifier core in 3-op-amp instrumentation topology for strain gauge or thermocouple readout. IC Role / Device Role / Timing Role: Dual amplifier implementing matched gain-setting and output buffering with high CMRR. Use Value: 105dB min CMRR over temperature rejects EMI-coupled common-mode noise from long sensor cables in industrial settings. |
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 |
|---|---|---|---|
| AD822ARZ | Higher 12nV/√Hz noise (1kHz), 1.8MHz GBW, ±15V max supply - lower bandwidth and higher noise limit use in wideband IR or synthesizer apps | Preferred in high-voltage industrial signal chains (>±5V); unsuitable for ±2.4V operation or sub-5MHz precision measurement | Select AD822ARZ only when supply >±5V is required and noise <5nV/√Hz is acceptable |
| OPA211AIDR | Lower 1.1nV/√Hz noise, 45MHz GBW, 27V max supply, but consumes 3.6mA per amp - superior noise/bandwidth at cost of higher quiescent power | Better for ultra-wideband RF sampling front-ends; less suitable for battery-powered portable instruments due to 44% higher supply current | Choose OPA211AIDR when 1.1nV/√Hz noise is mandatory and 3.6mA per amp fits system power budget |
Compared with AD822ARZ and OPA211AIDR, the MAX412BEPA+ uniquely balances 2.4nV/√Hz noise, 28MHz bandwidth, and 2.5mA supply current in a -40°C to +85°C rated DIP package - making it optimal for space-constrained, wide-temperature industrial instrumentation where both noise and power are tightly constrained.
Availability
MAX412BEPA+ is available at Aetrix Electronics and suitable for low-noise instrumentation amplifiers, infrared detector front-ends, and frequency synthesizer IF stages 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) designs precision analog and mixed-signal ICs for demanding industrial, medical, and communications applications, with emphasis on low-noise, high-reliability performance.
The MAX410/MAX412/MAX414 product line was engineered specifically for ultra-low-noise, wideband amplification in ±2.4V to ±5V systems - targeting high-fidelity sensor signal conditioning where voltage noise below 2.5nV/√Hz is essential.
FAQ
What is the maximum capacitive load the MAX412BEPA+ can drive stably in unity-gain configuration?
The MAX412BEPA+ remains unity-gain stable when driving up to 3900pF capacitive loads, as confirmed in the Typical Operating Characteristics section of the datasheet. This capability eliminates the need for external isolation resistors in many photodiode transimpedance amplifier designs. For loads exceeding 3900pF, a 10Ω series isolation resistor at the output restores phase margin - a solution validated in Figure 7a of the MAX412BEPA+ datasheet.
Does the MAX412BEPA+ require external offset nulling components?
No, the MAX412BEPA+ does not include internal offset null pins and is not designed for external trimming. Its input offset voltage is guaranteed at ±200µV maximum over the full -40°C to +85°C operating range, which is sufficient for most precision instrumentation applications without adjustment. Unlike the single-channel MAX410, the MAX412BEPA+ lacks NULL pins - this is confirmed by the absence of NULL terminals in its 8-pin DIP pinout diagram.
Is the MAX412BEPA+ pin-compatible with the LM358 or TL072?
Yes, the MAX412BEPA+ uses the industry-standard 8-pin dual op amp pinout: pins 1–3 and 5–8 correspond identically to LM358 and TL072 (output/in−/in+/V−/V+/in+/in−/output for Channel 2). This allows direct PCB-level replacement in existing designs, provided supply voltage and noise/performance requirements align - though note MAX412BEPA+ requires ±2.4V–±5V, while LM358 supports single-supply operation.
What is the guaranteed input voltage noise specification for MAX412BEPA+ at 10Hz?
The MAX412BEPA+ guarantees input voltage-noise density of ≤4.0nV/√Hz at 1kHz for the 'B' grade (MAX412B), and the 10Hz value is not separately specified in the datasheet. However, typical performance shows 1/F corner at 90Hz, meaning 10Hz noise is dominated by flicker component - typical 0.1Hz–10Hz peak-to-peak noise is 1.5µV, translating to ~150nV/√Hz spectral density at 10Hz. This value is measured, not guaranteed, and varies unit-to-unit.
Can the MAX412BEPA+ operate from a single +5V supply?
No, the MAX412BEPA+ is specified only for split-supply operation from ±2.4V to ±5V. It lacks rail-to-rail input or output capability and requires headroom: minimum input common-mode range is (V+ − 1.5V) to (V− + 1.5V), and output swing is limited to ±3.5V into 2kΩ with ±5V supplies. Single-supply use would violate absolute maximum ratings and result in clipping or undefined behavior - confirmed by the "Total Supply Voltage Considerations" section of the datasheet.
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:
- Obsolete
- 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.
MAX412BEPA+ Tags
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