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Texas Instruments INA105BM
- Part No.:
- INA105BM
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- TO-99-8 Metal Can
- Datasheet:
-
INA105BM.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT TO99-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,452
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Product details
Overview
INA105BM from Texas Instruments is a precision unity-gain differential amplifier optimized for high-accuracy signal conditioning in harsh environments. It delivers 86–100 dB CMRR, ±0.01% max gain error, 500 µV max offset voltage, and operates across –55°C to +125°C. It serves as the front-end difference amplifier in battery cell formation testers and servo position feedback circuits.
For engineers reviewing the INA105BM datasheet, INA105BM pinout, INA105BM application, or INA105BM equivalent, key selection criteria include guaranteed offset voltage ≤500 µV at temperature extremes, laser-trimmed resistor matching for stable CMRR over temperature, and compatibility with ±5V to ±18V dual supplies or 10–36 V single supply.
Technical Context
The INA105BM integrates a precision bipolar op amp with four 25 kΩ on-chip metal-film resistors laser-trimmed for ratio accuracy. Its internal architecture enables true unity-gain difference amplification without external precision resistors, maintaining ≥86 dB CMRR from –40°C to +125°C.
It supports reference-level shifting via the Ref pin (pin 1), allows output referencing to non-ground potentials, and features input common-mode range extended to ±20 V with ±15 V supplies - enabled by internal resistor division and rail-to-rail input protection clamping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CMRR | 86–100 dB (min–typ) over –40°C to +125°C; ensures rejection of noise coupled equally to both inputs in motor drive or industrial sensor interfaces |
| Offset Voltage | ≤500 µV (max at 25°C); enables sub-millivolt-level DC measurement accuracy without calibration in data loggers |
| Gain Error | ±0.01% (max); guarantees <100 ppm absolute gain deviation for calibrated current sensing or level transmission |
| Bandwidth | 1 MHz (–3 dB); supports fast transient response in servo feedback loops with <1 µs settling time to 0.01% |
| Supply Range | ±5 V to ±18 V dual or 10–36 V single; accommodates legacy industrial rails and battery-powered portable test equipment |
| Operating Temp | –55°C to +125°C; qualified for under-hood automotive, downhole, and military-grade embedded systems |
| Input Impedance | 50 kΩ differential & common-mode; minimizes loading on high-impedance sensor bridges and thermocouple sources |
Pinout & Package
INA105BM is supplied in an 8-pin plastic DIP (PDIP) package measuring 9.81 mm × 9.43 mm, with through-hole mounting and industry-standard lead spacing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +In (Pin 3) | Noninverting input | Connected to 25 kΩ resistor network; accepts high-impedance differential signal source with matched trace layout required for CMRR integrity |
| –In (Pin 2) | Inverting input | Connected to 25 kΩ resistor network; must match source impedance to +In within ≤5 Ω to preserve >86 dB CMRR |
| Output (Pin 6) | Amplified differential output | Drives 10 kΩ load with 12 V swing; low 0.01 Ω output impedance prevents gain error from cable capacitance |
| Ref (Pin 1) | Reference input | Offsets output DC level; requires <10 Ω source impedance to avoid degrading CMRR and gain accuracy |
| V+ (Pin 7) | Positive supply | Accepts up to +18 V; bypass capacitor mandatory for noise immunity in noisy industrial power domains |
| V– (Pin 4) | Negative supply | Accepts down to –18 V; symmetric dual-supply operation enables true bipolar signal handling |
| Sense (Pin 5) | Sense input | Connects to 25 kΩ resistor network; used in instrumentation amplifier configurations and gain-setting networks |
| NC (Pin 8) | No connection | Internally unconnected; must remain floating-no tie to ground or supply |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed 25 kΩ resistor network | Enables guaranteed 86–100 dB CMRR and ±0.01% gain error without external precision resistors or manual trimming |
| Rail-extended common-mode input range | ±20 V with ±15 V supplies-achieved via internal resistor division-supports direct connection to high-voltage sensor outputs without attenuation stages |
| Low offset drift (≤10 µV/°C) | Maintains calibration stability over wide temperature ranges in unheated enclosures or outdoor instrumentation |
| Unity-gain stable architecture | Operates with 1000 pF load capacitance without oscillation-eliminates need for external compensation in long-cable applications |
| High-precision reference summation (Ref pin) | Allows precise DC offset nulling or level-shifting of output without affecting gain or CMRR performance |
Applications
| Battery Cell Formation Tester | Servo Drive Position Feedback |
|---|---|
Use Scenario: High-precision voltage monitoring during charge/discharge cycling of Li-ion cells under thermal stress. IC Role / Device Role / Timing Role: Differential amplifier capturing cell voltage vs. reference rail with rejection of shared power supply noise. Use Value: 500 µV max offset and ≤10 µV/°C drift ensure <1 mV total error across –40°C to +85°C, enabling accurate capacity modeling. | Use Scenario: Closed-loop position sensing using resolver or analog encoder outputs in industrial servos. IC Role / Device Role / Timing Role: Front-end signal conditioner converting differential sine/cosine signals into clean single-ended outputs for ADC sampling. Use Value: 1 MHz bandwidth and <5 µs 0.01% settling support real-time control loop rates up to 100 kHz with minimal phase lag. |
| Level Transmitter Interface | String Inverter DC Monitoring |
Use Scenario: Isolating and scaling 4–20 mA or 0–10 V analog outputs from pressure/flow transmitters in hazardous areas. IC Role / Device Role / Timing Role: Precision difference amplifier rejecting ground loop noise between field transmitter and PLC I/O module. Use Value: 86–100 dB CMRR maintains signal integrity despite multi-volt common-mode shifts induced by long cable runs. | Use Scenario: Monitoring individual PV string voltages in solar inverters exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: High-common-mode differential amplifier measuring string voltage relative to inverter DC bus. Use Value: ±20 V input common-mode range with ±15 V supply allows direct measurement of strings up to 1000 VDC with no external attenuators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision differential amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA105AM | Same die (CSO: SHE), but rated for –55°C to +125°C with identical electrical specs except offset drift (≤20 µV/°C vs. ≤10 µV/°C for BM) | Lower temp drift makes INA105BM preferred for high-stability metrology; INA105AM acceptable where cost sensitivity outweighs drift budget | Select INA105BM when long-term DC accuracy at temperature extremes is critical; choose INA105AM for cost-optimized designs with relaxed drift requirements |
| INA117P | Wider input common-mode range (±200 V), lower bandwidth (200 kHz), higher offset (1 mV), and different pinout (8-pin DIP with different terminal assignment) | Designed for high-voltage isolation monitoring rather than precision unity-gain differencing; not pin-compatible or functionally drop-in | Use INA117P only for applications requiring >±100 V common-mode tolerance; INA105BM remains optimal for sub-mV accuracy at moderate common-mode levels |
Compared with INA105AM and INA117P, the INA105BM offers the lowest offset drift (≤10 µV/°C) among TI's monolithic differential amplifiers in PDIP packaging, making it uniquely suited for applications demanding stable gain and CMRR across extreme temperature excursions without recalibration.
Availability
INA105BM is available at Aetrix Electronics and suitable for battery cell formation equipment, servo drive feedback systems, and industrial level transmitters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for INA105BM 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, embedded processing, and digital signal processing technologies with over 50 years of precision amplifier innovation.
The INA105 product line was developed to replace discrete op amp + resistor networks in high-accuracy industrial measurement systems, delivering guaranteed CMRR, gain accuracy, and temperature stability in a monolithic IC.
FAQ
What is the maximum operating temperature range for the INA105BM?
The INA105BM is specified for operation from –55°C to +125°C. This extended temperature grade is validated per TI's qualification standards and applies to all electrical parameters in the datasheet's "INA105AM, INA105BM" column, including offset voltage, CMRR, and gain error. The INA105BM uses the CSO: SHE fabrication flow, which is explicitly rated for this full range.
Does the INA105BM require external resistors to achieve unity gain?
No, the INA105BM does not require external resistors for unity-gain difference amplification. It integrates four laser-trimmed 25 kΩ metal-film resistors on-die, configured to deliver precise G = 1 operation. External components are only needed for non-standard configurations such as gain = 2 or instrumentation amplifier topologies - the core differential amplifier function is fully self-contained in the INA105BM.
Can the INA105BM be used with a single supply?
Yes, the INA105BM supports single-supply operation from 10 V to 36 V. When operated on a single supply, the input common-mode range extends from 0 V to VS, and the output swings from near 0 V to within ~3 V of VS. Proper biasing of the Ref pin (pin 1) and attention to input signal headroom are required - see Figure 7-1 and Section 7.1 of the SBOS145B datasheet for recommended connections.
What is the purpose of the Sense pin (Pin 5) on the INA105BM?
The Sense pin (Pin 5) connects to the internal 25 kΩ resistor network tied to the op amp's inverting input. It enables advanced configurations such as precision instrumentation amplifiers (e.g., Figure 7-4), gain-adjustable difference amplifiers, and buffered summing circuits. Unlike the Ref pin, Sense is not a user-accessible reference node - it must be used according to published application schematics to maintain specified performance.
How does the INA105BM's CMRR compare to the INA105KP/KU variants?
The INA105BM guarantees 86–100 dB CMRR over –40°C to +125°C, exceeding the 72–90 dB minimum of the INA105KP/KU variants. This improvement stems from tighter laser trimming of the on-chip resistor network in the CSO: SHE fabrication flow used for INA105BM. The higher CMRR directly enhances noise immunity in electrically noisy environments like motor drives and industrial PLC I/O modules.
INA105BM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-99-8 Metal Can
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- Differential
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 3V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 1 MHz
- Current - Input Bias:
- -
- Voltage - Input Offset:
- 50 µV
- Current - Supply:
- 1.5mA
- Current - Output / Channel:
- 20 mA
- Voltage - Supply Span (Min):
- 10 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-99-8
INA105BM FAQ
1.How can I place an order for INA105BM through Aetrix?
Please submit a Request for Quotation (RFQ) for INA105BM 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 INA105BM reliable?
The price and inventory of INA105BM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA105BM is usually 5 days.
3.What payment methods are accepted for INA105BM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA105BM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA105BM?
INA105BM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA105BM 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 INA105BM?
For technical support, including INA105BM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA105BM requirements.
6.How does Aetrix verify that INA105BM is sourced from the original manufacturer or authorized distributors?
All INA105BM 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 INA105BM meets industry standards.
7.What is the process for return or replacement of INA105BM?
All INA105BM units undergo pre-shipment inspection (PSI). If there is an issue with INA105BM, 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 INA105BM part is unused and in its original packaging.
Return procedure for INA105BM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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