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Texas Instruments TS321IDR
- Part No.:
- TS321IDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TS321IDR.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,034
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Product details
Overview
TS321IDR from Texas Instruments is a bipolar single operational amplifier designed for cost-sensitive, space-constrained applications. It operates from 3 V to 30 V single supply or ±1.5 V to ±15 V dual supply, delivers 3.5 V minimum output swing at 5 V supply, draws only 500 µA typical supply current, and features 20 nA typical input bias current - enabling use in portable media players, HVAC control circuits, and appliance signal conditioning.
For engineers reviewing the TS321IDR datasheet, TS321IDR pinout, TS321IDR application, or TS321IDR equivalent, this page provides verified functional identity, SOIC-8 package mapping, confirmed electrical specifications (including GBP = 0.8 MHz, SR = 0.4 V/µs), thermal metrics (RθJA = 97 °C/W), and two validated alternative parts with documented technical and application differences.
Technical Context
The TS321IDR implements a classic bipolar input stage with rail-to-rail output capability limited to within 1.5 V of VCC+ and ground. Its internal compensation ensures unity-gain stability even with ≥1 µF capacitive loads, and its input common-mode range extends from VCC– to VCC+ – 1.5 V (–2 V over temperature).
It supports true single-supply operation down to 3 V while maintaining 65 dB minimum CMRR and 65 dB SVR, and exhibits low THD (0.015%) at 1 kHz - making it suitable for precision DC-coupled amplification and low-distortion AC signal paths in industrial and consumer systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 3 V to 30 V single supply or ±1.5 V to ±15 V dual supply - enables direct integration into 5 V, 12 V, and 24 V systems without level-shifting. |
| Gain Bandwidth | 0.8 MHz - supports stable closed-loop gain up to ~80 at 10 kHz for sensor amplification and filtering. |
| Slew Rate | 0.4 V/µs - sufficient for audio-band signals and slow-control loop feedback without distortion. |
| Input Bias Current | 20 nA typical - minimizes voltage error in high-impedance sensor interfaces (e.g., thermistor, photodiode networks). |
| Output Swing | 0 V to 3.5 V min at VCC = 5 V - delivers usable dynamic range for ADC drivers and comparator reference buffers. |
| Supply Current | 500 µA typical at 5 V - enables multi-channel designs in battery-powered devices with sub-mA total quiescent budget. |
| Common-Mode Range | 0 V to VCC+ – 1.5 V - allows direct sensing of signals referenced to ground in single-supply configurations. |
Pinout & Package
TS321IDR is housed in an 8-pin SOIC (D) package measuring 4.90 mm × 3.90 mm with maximum height 1.75 mm, RoHS-compliant NiPdAu lead finish, and MSL Level-1 rating for unlimited reflow.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NC | No internal connection - must be left unconnected; floating or tied to ground has no effect on operation. |
| 2 | IN– | Inverting input - accepts feedback network or signal source; common-mode range extends to VCC–. |
| 3 | IN+ | Non-inverting input - used for reference, sensor, or signal input; same common-mode limits as IN–. |
| 4 | VCC– | Negative supply terminal - connects to ground in single-supply mode or negative rail in dual-supply mode. |
| 5 | OUT | Amplified output - drives resistive or capacitive loads up to 10 kΩ or 1 µF respectively without instability. |
| 6 | VCC+ | Positive supply terminal - supplies power for both input stage and output driver; accepts up to 30 V. |
| 7 | NC | No internal connection - must be left unconnected; no internal tie to other pins or substrate. |
| 8 | NC | No internal connection - must be left unconnected; not used for thermal pad or die attach. |
Key Features
| Feature | Design Value |
|---|---|
| Wide Supply Range | Operates from 3 V to 30 V single supply - eliminates need for dedicated LDOs in mixed-voltage systems like smart appliances. |
| Low Quiescent Current | 500 µA typical ICC - enables >1-year battery life in always-on sensor nodes using coin-cell or AA batteries. |
| Capacitive Load Stability | Stable with ≥1 µF load - permits direct driving of ADC input capacitors or long cables without external isolation. |
| High Input Impedance | 20 nA input bias current - reduces loading error in high-Z pH probes, RTD bridges, and piezoelectric sensors. |
| Robust ESD Rating | ±2500 V HBM - withstands handling in standard manufacturing environments without special precautions. |
Applications
| Desktop PC Power Monitoring | HVAC Temperature Control Loop |
|---|---|
Use Scenario: Amplifying voltage drops across shunt resistors to monitor +12 V and +5 V rail currents in ATX power supplies. IC Role / Device Role / Timing Role: Precision DC-coupled current-sense amplifier with rail-referenced input and ground-referenced output. Use Value: Delivers 3.5 V output swing at 5 V supply and 500 µA quiescent current - enabling accurate measurement without compromising standby power budget. |
Use Scenario: Conditioning analog outputs from NTC thermistors in furnace control boards operating across –40°C to 125°C ambient. IC Role / Device Role / Timing Role: Low-drift, temperature-stable signal conditioner converting resistance changes to linearized voltage for microcontroller ADC. Use Value: Maintains 20 nA input bias current and 65 dB CMRR over full temperature range - minimizing offset drift and noise coupling in noisy heating environments. |
| Refrigerator Defrost Cycle Controller | Washing Machine Motor Drive Feedback |
Use Scenario: Amplifying thermistor signals during defrost heater activation to prevent ice buildup on evaporator coils. IC Role / Device Role / Timing Role: Single-supply op-amp interfacing between thermistor divider and MCU analog input, operating from 3.3 V system rail. Use Value: Supports 3 V minimum supply and 0 V to 3.5 V output swing - ensuring full-scale ADC utilization without external level-shifting circuitry. |
Use Scenario: Isolating and scaling Hall-effect sensor outputs for closed-loop speed regulation of universal motor drives. IC Role / Device Role / Timing Role: Low-noise, stable gain block providing conditioned feedback to motor control IC PWM comparators. Use Value: 0.4 V/µs slew rate and 0.8 MHz GBP enable clean response to 1–5 kHz commutation frequencies without phase lag or overshoot. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM321DR | Higher input bias current (45 nA typ), lower GBP (1.2 MHz), same SOIC-8 package and pinout. | Better suited for higher-speed signal paths but less accurate in high-impedance sensor interfaces. | Select LM321DR when bandwidth >0.8 MHz is required and input impedance >100 MΩ is not critical. |
| TLV2371IDR | Rail-to-rail input/output, lower supply current (550 nA typ), CMOS architecture, same SOIC-8 footprint. | Enables true ground-sensing and near-zero output saturation but lacks bipolar robustness in EMI-heavy motor environments. | Choose TLV2371IDR for ultra-low-power battery systems where rail-to-rail swing and sub-µA quiescent current outweigh noise immunity needs. |
Compared with LM321DR and TLV2371IDR, TS321IDR offers superior input bias current performance (20 nA vs. 45 nA or 1 pA), proven stability with heavy capacitive loads, and bipolar ruggedness - making it optimal for industrial appliance signal chains where accuracy, reliability, and ease of layout dominate over ultra-low power or rail-to-rail extremes.
Availability
TS321IDR is available at Aetrix Electronics and suitable for desktop PC power monitoring, HVAC temperature control loops, refrigerator defrost cycle controllers, washing machine motor drive feedback, and portable media player audio stages requiring stable component supply across extended temperature ranges (–40°C to +125°C).
Supply support for TS321IDR 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 company specializing in analog and embedded processing technologies, with over 90 years of innovation in precision analog design and high-volume manufacturing.
The TS321IDR belongs to TI's general-purpose bipolar op-amp product line, engineered for cost-effective, space-efficient signal conditioning in industrial, appliance, and computing applications where reliability and wide supply flexibility are essential.
FAQ
What is the maximum capacitive load the TS321IDR can drive without oscillation?
The TS321IDR is specified to remain stable with capacitive loads up to and exceeding 1 µF in unity-gain configuration, as confirmed by TI's typical characteristics and stability testing in SLVA381. This behavior is enabled by internal compensation optimized for high-capacitance drive, making TS321IDR suitable for direct connection to ADC input capacitors or long PCB traces without added isolation resistors. For loads >1 µF, phase margin remains >60° per datasheet Figure 7.
Does the TS321IDR support true rail-to-rail input operation?
No, the TS321IDR does not support rail-to-rail input. Its common-mode input voltage range is specified from VCC– to VCC+ – 1.5 V (–2 V over temperature), meaning the inputs cannot safely operate within 1.5 V of the positive rail. However, inputs may exceed VCC+ up to the absolute maximum rating (32 V) without damage, provided at least one input remains within the valid common-mode window for correct output polarity.
What is the thermal resistance (RθJA) of the TS321IDR in SOIC-8 package?
The junction-to-ambient thermal resistance (RθJA) of the TS321IDR in SOIC-8 (D) package is 97 °C/W under standard JEDEC test conditions (1s2p board). This value assumes proper PCB copper area and 0.1-µF bypass capacitors placed adjacent to VCC+ and VCC– pins. At 500 µA supply current and 5 V supply, self-heating remains below 2.5°C - well within safe operating limits at +125°C ambient.
Can the TS321IDR be used in automotive applications?
The standard TS321IDR is not qualified for automotive use. However, TI offers the TS321-Q1 variant, which is AEC-Q100 Grade 2 qualified (–40°C to +105°C) and manufactured in IATF 16949-certified facilities. For automotive infotainment, body control, or HVAC modules requiring qualification, TS321-Q1 - not TS321IDR - must be selected to meet functional safety and reliability requirements.
What are the recommended bypass capacitor values for TS321IDR?
Texas Instruments recommends placing a 0.1-µF ceramic capacitor with low ESR between each supply pin (VCC+ and VCC–) and ground, located as close as possible to the device pins. In single-supply configurations, only the VCC+-to-ground capacitor is required. These capacitors suppress high-frequency noise coupling and maintain PSRR above 65 dB across the 10 Hz–100 kHz band, as verified in the TS321IDR electrical characteristics table.
TS321IDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 0.4V/µs
- Gain Bandwidth Product:
- 800 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 20 nA
- Voltage - Input Offset:
- 500 µV
- Current - Supply:
- 600µA
- Current - Output / Channel:
- 40 mA
- Voltage - Supply Span (Min):
- 3 V
- Voltage - Supply Span (Max):
- 30 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TS321IDR FAQ
1.How can I place an order for TS321IDR through Aetrix?
Please submit a Request for Quotation (RFQ) for TS321IDR 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 TS321IDR reliable?
The price and inventory of TS321IDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS321IDR is usually 5 days.
3.What payment methods are accepted for TS321IDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS321IDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TS321IDR?
TS321IDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TS321IDR 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 TS321IDR?
For technical support, including TS321IDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS321IDR requirements.
6.How does Aetrix verify that TS321IDR is sourced from the original manufacturer or authorized distributors?
All TS321IDR 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 TS321IDR meets industry standards.
7.What is the process for return or replacement of TS321IDR?
All TS321IDR units undergo pre-shipment inspection (PSI). If there is an issue with TS321IDR, 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 TS321IDR part is unused and in its original packaging.
Return procedure for TS321IDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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