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Texas Instruments TS321ID
- Part No.:
- TS321ID
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TS321ID.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,849
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Product details
Overview
TS321ID from Texas Instruments is a bipolar single-channel 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 battery-powered HVAC sensors and portable media player signal conditioning.
For engineers reviewing the TS321ID datasheet, TS321ID pinout, TS321ID application, or TS321ID equivalent, this page provides verified package mapping (SOIC-8), confirmed electrical parameters (VIO = 4 mV typ, GBP = 0.8 MHz, SR = 0.4 V/µs), thermal metrics (RθJA = 97 °C/W), and validated alternatives for low-power analog signal conditioning in industrial and consumer systems.
Technical Context
The TS321ID implements a classic bipolar input stage with rail-to-rail output capability limited by saturation voltage (VOL = 3 mV min at 10 kΩ load). Its gain-bandwidth product of 0.8 MHz and 0.4 V/µs slew rate support stable unity-gain and low-frequency closed-loop configurations up to ~100 kHz.
It supports wide common-mode input range (0 V to VCC+ – 1.5 V) and tolerates inputs exceeding VCC (up to absolute max 32 V), enabling robust operation in mixed-supply systems. Input bias current remains stable across temperature (20–200 nA), and phase margin is guaranteed ≥60° under capacitive loads ≤1 nF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3 V to 30 V single supply or ±1.5 V to ±15 V dual supply - supports direct integration into 5 V microcontroller peripherals and 24 V industrial I/O modules. |
| Input Offset Voltage | 4 mV typical (5 mV max over full temperature) - enables accurate DC-coupled sensor amplification without frequent calibration. |
| Gain Bandwidth Product | 0.8 MHz - sufficient for anti-aliasing filters, active RC low-pass stages, and audio preamplifiers up to 10 kHz. |
| Slew Rate | 0.4 V/µs - limits large-signal response time to ≥2.5 µs for 1 V step, suitable for slow-varying process signals. |
| Supply Current | 500 µA typical at 5 V - allows continuous operation in always-on battery-powered nodes with multi-year runtime. |
| Output Voltage Swing | 0 V to 3.5 V minimum at VCC = 5 V - delivers >70% of rail-to-rail swing for ADC interfacing with 3.3 V logic. |
| Common-Mode Input Range | 0 V to VCC+ – 1.5 V - accommodates ground-referenced transducer inputs while rejecting supply noise. |
Pinout & Package
TS321ID is packaged in an 8-pin SOIC (D) body measuring 4.90 mm × 3.90 mm with maximum height 1.75 mm, RoHS-compliant NiPdAu lead finish, and MSL Level-1 rating.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NC | No internal connection - must be left unconnected; not usable as enable or shutdown control. |
| 2 | IN– | Inverting input terminal - accepts feedback network or signal source; input bias current flows out of device (20 nA typ). |
| 3 | IN+ | Non-inverting input terminal - reference point for differential amplification; common-mode range extends to VCC+ – 1.5 V. |
| 4 | VCC– | Negative supply pin - connects to ground (single supply) or negative rail (dual supply); must be bypassed with 0.1 µF ceramic capacitor. |
| 5 | NC | No internal connection - electrically isolated; no routing or grounding required. |
| 6 | OUT | Amplified output node - drives loads down to 2 kΩ; capable of sourcing 20 mA and sinking 10 mA at 15 V supply. |
| 7 | VCC+ | Positive supply pin - accepts 3–30 V; requires local 0.1 µF bypass to ground to suppress high-frequency supply noise. |
| 8 | NC | No internal connection - unused pad; no electrical function or thermal benefit when connected. |
Key Features
| Feature | Design Value |
|---|---|
| Wide Supply Range | Operates from 3 V to 30 V single supply - eliminates need for dedicated LDOs in multi-rail systems like smart thermostats. |
| Low Power Consumption | 500 µA typical ICC at 5 V - reduces thermal load in sealed enclosures and extends battery life in portable diagnostics. |
| Stable With Capacitive Loads | Maintains ≥60° phase margin with ≤1 nF output capacitance - avoids oscillation when driving long PCB traces or EMI filters. |
| Rail-Compatible Inputs | Input common-mode range includes ground and extends to VCC+ – 1.5 V - simplifies level-shifting for 0–5 V sensor interfaces. |
| Robust ESD Protection | ±2500 V HBM rating - withstands handling in non-ESD-controlled assembly environments without additional protection diodes. |
Applications
| Desktop PC Power Monitoring | HVAC Temperature Sensing |
|---|---|
Use Scenario: Amplifying millivolt-level output from NTC thermistors in CPU voltage regulator modules. IC Role / Device Role / Timing Role: Precision DC-coupled non-inverting amplifier with gain = 10, referenced to system ground. Use Value: 4 mV typical VIO ensures <±5°C error over 0–100°C range without trimming; 500 µA supply current minimizes self-heating drift. |
Use Scenario: Conditioning bridge-output signals from HVAC airflow pressure sensors. IC Role / Device Role / Timing Role: Single-supply instrumentation amplifier front-end with rail-to-rail output swing. Use Value: 0 V to 3.5 V output swing at 5 V supply matches 12-bit SAR ADC input range; 20 nA IIB prevents loading of high-Z sensor bridges. |
| Refrigerator Defrost Control | Washing Machine Motor Current Sensing |
Use Scenario: Amplifying voltage drop across shunt resistor during defrost heater activation. IC Role / Device Role / Timing Role: High-side current sense amplifier with VCC = 24 V and ground-referenced output. Use Value: Input tolerance up to 32 V allows direct connection to heater supply; 0.4 V/µs slew rate suffices for 50 Hz AC-triggered on/off control. |
Use Scenario: Isolating and scaling motor phase current for microcontroller ADC sampling. IC Role / Device Role / Timing Role: Low-drift inverting amplifier with gain = 5, operating from 3.3 V MCU supply. Use Value: 5 mV max VIO over temperature ensures <±2% current measurement accuracy; SOIC-8 footprint fits tight motor control board layouts. |
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. | Less suitable for high-impedance sensor interfaces but better for higher-frequency filtering. | Select LM321DR only if bandwidth >0.8 MHz is required and input impedance >100 kΩ is not critical. |
| TLV2461CDR | Rail-to-rail input/output, CMOS architecture, 650 µA supply current, SOIC-8 pin-compatible. | Enables true 0–5 V signal swing but increases quiescent power by 30% and reduces output drive strength. | Choose TLV2461CDR when full rail-to-rail operation is mandatory and supply current budget allows +150 µA overhead. |
Compared with TS321ID, LM321DR trades lower offset for higher bias current, while TLV2461CDR replaces bipolar performance with rail-to-rail flexibility at higher power - making TS321ID optimal for cost-sensitive, low-power, ground-referenced analog front-ends where 3.5 V output swing and 20 nA bias are design-critical.
Availability
TS321ID is available at Aetrix Electronics and suitable for HVAC control modules, refrigerator defrost circuits, and washing machine motor monitoring requiring stable component supply across extended production lifecycles.
Supply support for TS321ID 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 precision amplifiers and industrial-grade ICs.
The TS321ID belongs to TI's general-purpose op-amp portfolio, engineered for cost-effective, reliable signal conditioning in consumer and industrial equipment where space, power, and stability are constrained.
FAQ
What is the maximum operating temperature range for the TS321ID?
The TS321ID is rated for operation from –40°C to +125°C ambient temperature, as confirmed in Section 6.3 of the official datasheet (SLOS489D). This extended range supports deployment in automotive cabin modules, industrial PLC I/O cards, and outdoor HVAC units where thermal cycling exceeds commercial-grade limits. The TS321ID maintains specified electrical performance - including 500 µA supply current and 4 mV input offset - across this full range.
Does the TS321ID support single-supply operation?
Yes, the TS321ID fully supports single-supply operation from 3 V to 30 V, as explicitly stated in the Features section and Recommended Operating Conditions table. Its input common-mode range includes ground (0 V) and extends to VCC+ – 1.5 V, and its output swings from 0 V to at least 3.5 V at 5 V supply - enabling direct interfacing with microcontrollers and ADCs without level-shifting circuitry. This capability is validated in Figure 3 and Table 6.5 of the datasheet.
What is the purpose of the NC pins on the TS321ID SOIC-8 package?
The TS321ID SOIC-8 package has three NC (no internal connection) pins: Pin 1, Pin 5, and Pin 8. These pins are physically present but electrically isolated from the die - they serve no functional role and must remain unconnected. TI's Pin Functions table confirms no internal bond wire or circuit connection exists. Routing or grounding these pins offers no thermal or electrical benefit and may risk unintended coupling in high-frequency layouts.
Can the TS321ID drive a 10 kΩ load while maintaining specification?
Yes, the TS321ID guarantees low-level output voltage (VOL) ≤15 mV and high-level output voltage (VOH) ≥3.5 V at 5 V supply with a 10 kΩ load, per Table 6.5 Electrical Characteristics. At full temperature range (–40°C to +125°C), VOL remains ≤20 mV and VOH ≥3 V - confirming robust performance into standard pull-up/pull-down and ADC input impedances without external buffering.
Is the TS321ID pin-compatible with other single op-amps in SOIC-8?
No, the TS321ID uses a non-standard SOIC-8 pinout: IN– on Pin 2, IN+ on Pin 3, VCC– on Pin 4, OUT on Pin 6, and VCC+ on Pin 7 - differing from industry-standard LM324/LM358 (IN+ on Pin 3, IN– on Pin 2, OUT on Pin 1). Direct replacement requires PCB layout revision. This configuration is documented in Figure 5 (Pin Configuration and Functions) and confirmed across all TI datasheet revisions.
TS321ID 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:
- 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
TS321ID FAQ
1.How can I place an order for TS321ID through Aetrix?
Please submit a Request for Quotation (RFQ) for TS321ID 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 TS321ID reliable?
The price and inventory of TS321ID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS321ID is usually 5 days.
3.What payment methods are accepted for TS321ID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS321ID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TS321ID?
TS321ID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TS321ID 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 TS321ID?
For technical support, including TS321ID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS321ID requirements.
6.How does Aetrix verify that TS321ID is sourced from the original manufacturer or authorized distributors?
All TS321ID 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 TS321ID meets industry standards.
7.What is the process for return or replacement of TS321ID?
All TS321ID units undergo pre-shipment inspection (PSI). If there is an issue with TS321ID, 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 TS321ID part is unused and in its original packaging.
Return procedure for TS321ID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TS321ID Tags
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STMicroelectronics
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