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Texas Instruments THS4521SKGD1
- Part No.:
- THS4521SKGD1
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- Die
- Datasheet:
-
THS4521SKGD1.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 0XCEPT
- Quantity:
- Payment:
- Shipping:
Inventory:3,035
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Product details
Overview
THS4521SKGD1 from Texas Instruments is a high-temperature, fully differential amplifier with negative-rail input (NRI) and rail-to-rail output (RRO), designed for down-hole drilling and extreme-environment signal conditioning. It delivers 40.7 MHz small-signal bandwidth, 353.5 V/μs slew rate, –96 dBc HD2 at 1 kHz (210°C), 19.95 nV/√Hz input voltage noise, and operates from –55°C to 210°C on 2.5–3.3 V supplies.
For engineers reviewing the THS4521SKGD1 datasheet, THS4521SKGD1 pinout, THS4521SKGD1 application, or THS4521SKGD1 equivalent, this bare-die amplifier requires attention to thermal management, VOCM control accuracy, power-down timing, and high-temperature PCB layout practices for reliable operation in down-hole telemetry and industrial sensor front-ends.
Technical Context
The THS4521SKGD1 implements a fully differential architecture with precise output common-mode control via the VOCM pin, enabling DC-coupled interfacing to SAR and ΔΣ ADCs without level-shifting. Its NRI input extends common-mode range to VS–, supporting single-ended ground-referenced sources with minimal external components.
It features internal power-down logic (PD pin), low 1.4 mA/ch quiescent current at 3.3 V, and robust 210°C-rated performance validated across AC/DC parameters including open-loop gain (90 dB typ), harmonic distortion (HD2/HD3), and overdrive recovery (126 ns). All specifications are characterized over –55°C to 210°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temperature | –55°C to +210°C - qualified for down-hole drilling and aerospace-grade extended-life applications |
| Small-Signal Bandwidth | 40.7 MHz at 210°C - enables high-fidelity analog front-end sampling up to ~20 MSPS with margin |
| Slew Rate | 353.5 V/μs (differential, 210°C) - supports fast transient response for pulse-based sensor signals |
| Input Voltage Noise | 19.95 nV/√Hz at 100 kHz (210°C) - maintains SNR integrity in low-amplitude, high-temperature transducer interfaces |
| Harmonic Distortion | –96 dBc HD2 / –91.5 dBc HD3 at 1 kHz, 1 VRMS (210°C) - meets precision data acquisition linearity requirements |
| Power Supply Range | 2.5 V (±1.25 V) to 3.3 V (±1.65 V) - compatible with low-voltage, high-density industrial power rails |
| Quiescent Current | 1.4 mA per channel at 3.3 V - enables ultra-low-power multi-channel systems in thermally constrained enclosures |
| Power-Down Current | 10 µA typical at 210°C - allows duty-cycled operation to extend system-level thermal budget |
Pinout & Package
Bare die (KGD) package with 12 bond pads; no leadframe or molded body. Requires custom flip-chip or wire-bond assembly onto ceramic or metal-core substrate with thermal vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN– | Inverting input | Accepts differential or single-ended signals referenced to ground; supports NRI operation down to VS– |
| VOCM | Output common-mode control | Directly sets differential output midpoint; enables precise DC coupling to ADC reference planes |
| VS+ | Positive supply | Accepts 2.5–3.3 V; three separate VS+ pads (pins 3, 4, 5) support low-impedance routing and current sharing |
| VOUT+ | Noninverting output | Differential output node; rail-to-rail swing (0.09–3.11 V at 3.3 V supply) enables full ADC dynamic range utilization |
| VOUT– | Inverting output | Complementary differential output; matched to VOUT+ for >45 dB output balance error up to 2 MHz |
| VS– | Negative supply | Three dedicated VS– pads (pins 8, 9, 10) provide low-inductance return path for high-speed output currents |
| PD | Power-down enable | Logic-low assertion disables amplifier; turn-off delay 144.5 ns (210°C); critical for burst-mode sensing |
| VIN+ | Noninverting input | Primary signal input; paired with VIN– for fully differential operation or used alone with VOCM for SE-to-DE conversion |
Key Features
| Feature | Design Value |
|---|---|
| Fully differential architecture | Eliminates even-order harmonics and common-mode interference in noisy down-hole environments |
| Negative-rail input (NRI) | Accepts input signals down to VS–, enabling direct connection to ground-referenced sensors without biasing circuitry |
| Rail-to-rail output (RRO) | Maximizes dynamic range into 1-kΩ differential loads; supports 2-VPP output swing at 3.3 V supply |
| Output common-mode control (VOCM) | Enables dc-coupled interface to ADCs with <±5 mV offset drift over temperature, reducing calibration overhead |
| High-temperature qualification | Controlled baseline, extended product life cycle, and 10-year reliability modeling at 105°C junction temperature |
| Low-power power-down mode | Reduces quiescent current from 1.4 mA to 10 µA, extending battery life in intermittent-sampling telemetry systems |
Applications
| Down-Hole Drilling Sensor Interface | High-Temperature Industrial Data Acquisition |
|---|---|
Use Scenario: Signal conditioning of piezoelectric and resistive sensors in oil/gas wellbore tools operating at 210°C. IC Role / Device Role / Timing Role: Fully differential amplifier driving SAR ADC inputs with precise VOCM-controlled common-mode level. Use Value: Enables direct dc-coupled analog front-end without external level shifters, reducing component count and thermal mismatch errors. |
Use Scenario: Analog signal chain for pressure, temperature, and vibration monitoring in turbine engine control units. IC Role / Device Role / Timing Role: Low-noise, high-bandwidth buffer between MEMS sensor outputs and isolated ΣΔ ADCs. Use Value: Maintains –96 dBc HD2 at 1 kHz under sustained 210°C operation, preserving measurement fidelity for predictive maintenance algorithms. |
| Aerospace Downlink Telemetry Front-End | Geophysical Seismic Data Logger |
Use Scenario: Conditioning of low-amplitude seismic transducer outputs in satellite-mounted geophysical payloads. IC Role / Device Role / Timing Role: High-slew-rate differential driver for multiplexed ADC inputs with synchronized power-down during idle cycles. Use Value: 353.5 V/μs slew rate ensures faithful reproduction of transient shock events; 10 µA power-down current minimizes standby power in battery-limited missions. |
Use Scenario: Multi-channel analog front-end in portable seismic arrays deployed in desert or arctic environments. IC Role / Device Role / Timing Role: Low-noise (19.95 nV/√Hz), wide-bandwidth amplifier for geophone and hydrophone signals before digitization. Use Value: Delivers 40.7 MHz bandwidth at 210°C, supporting oversampling for noise shaping while maintaining thermal stability across diurnal temperature swings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fully differential amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS4521SHKJ | Same die, ceramic CQFP-16 package with lid; includes thermal pad and standardized footprint | Preferred for prototyping and medium-volume production where reflow assembly is required | Select THS4521SHKJ when standard surface-mount assembly, thermal testing, or evaluation board compatibility is needed |
| THS4521SHKQ | Same die, ceramic QFN-16 package; smaller footprint (5 mm × 5 mm) and lower profile than HKJ | Better suited for space-constrained down-hole modules requiring minimal Z-height and high thermal conductivity | Select THS4521SHKQ when board area and thermal resistance to heatsink are prioritized over manual handling or socketing |
Compared with THS4521SHKJ and THS4521SHKQ, THS4521SKGD1 offers maximum design flexibility for custom thermal substrates and ultra-high-reliability hermetic packaging but requires specialized die attach and wire bonding-making it optimal for high-volume, mission-critical down-hole ASIC integration.
Availability
THS4521SKGD1 is available at Aetrix Electronics and suitable for down-hole drilling, aerospace telemetry, and high-temperature industrial data acquisition requiring stable component supply across extended temperature lifecycles.
Supply support for THS4521SKGD1 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 deep expertise in high-reliability, high-temperature IC design.
The THS4521 product line was developed specifically for extreme-environment signal conditioning-targeting oil/gas exploration, aerospace, and industrial systems where conventional amplifiers fail above 150°C.
FAQ
What is the maximum junction temperature rating for THS4521SKGD1?
The THS4521SKGD1 is rated for continuous operation up to 217°C junction temperature, with guaranteed parametric performance over –55°C to +210°C ambient. Its silicon process and packaging are optimized for electromigration resistance, supporting 10-year reliability at 105°C junction temperature per TI's lifetime modeling.
How does the VOCM pin function in THS4521SKGD1, and what is its voltage range?
The VOCM pin in THS4521SKGD1 directly controls the common-mode voltage of the differential outputs, with a specified range of 0.8 V to 2.5 V when VS+ = 3.3 V and VS– = 0 V. It achieves ±0.7 mV typical offset from target at 210°C, enabling precise DC-coupled interfacing to ADCs without external level-shifting circuitry.
Can THS4521SKGD1 drive a 50-Ω load, and what is its output current capability?
Yes, THS4521SKGD1 can drive a 50-Ω load with ±33 mA output current (linear operation, 210°C), supporting direct connection to coaxial transmission lines or RF test equipment. However, sustained high-current operation at elevated temperatures requires thermal derating per Figure 1 in the datasheet to maintain reliability.
What is the purpose of the three VS+ and three VS– bond pads on THS4521SKGD1?
The three VS+ (pins 3, 4, 5) and three VS– (pins 8, 9, 10) bond pads on THS4521SKGD1 reduce power-supply impedance and inductance by enabling parallel wire bonds or multiple flip-chip bumps. This minimizes supply noise coupling and improves PSRR (60–85 dB) and transient response in high-speed, high-temperature operation.
Is THS4521SKGD1 pin-compatible with other variants like THS4521SHKJ or THS4521SHKQ?
No-THS4521SKGD1 is a bare-die (KGD) variant with 12 bond pads in a custom layout, while THS4521SHKJ (CQFP-16) and THS4521SHKQ (QFN-16) are packaged versions with different pinouts and footprints. They share identical electrical functionality but require distinct assembly processes and PCB layouts.
THS4521SKGD1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- Die
- Packaging:
- Tray
- Product Status:
- Active
- Amplifier Type:
- Differential
- Number of Circuits:
- 1
- Output Type:
- Differential, Rail-to-Rail
- Slew Rate:
- 422.5V/µs
- Gain Bandwidth Product:
- 81 MHz
- -3db Bandwidth:
- 104.3 MHz
- Current - Input Bias:
- 750 nA
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 1mA
- Current - Output / Channel:
- 35 mA
- Voltage - Supply Span (Min):
- 2.5 V
- Voltage - Supply Span (Max):
- 3.6 V
- Operating Temperature:
- -55°C ~ 210°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 0-XCEPT
THS4521SKGD1 FAQ
1.How can I place an order for THS4521SKGD1 through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4521SKGD1 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 THS4521SKGD1 reliable?
The price and inventory of THS4521SKGD1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4521SKGD1 is usually 5 days.
3.What payment methods are accepted for THS4521SKGD1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4521SKGD1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4521SKGD1?
THS4521SKGD1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4521SKGD1 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 THS4521SKGD1?
For technical support, including THS4521SKGD1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4521SKGD1 requirements.
6.How does Aetrix verify that THS4521SKGD1 is sourced from the original manufacturer or authorized distributors?
All THS4521SKGD1 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 THS4521SKGD1 meets industry standards.
7.What is the process for return or replacement of THS4521SKGD1?
All THS4521SKGD1 units undergo pre-shipment inspection (PSI). If there is an issue with THS4521SKGD1, 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 THS4521SKGD1 part is unused and in its original packaging.
Return procedure for THS4521SKGD1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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