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Texas Instruments THS4521SHKJ
- Part No.:
- THS4521SHKJ
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-CFlatPack
- Datasheet:
-
THS4521SHKJ.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8CFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,937
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Product details
Overview
THS4521SHKJ from Texas Instruments is a fully differential amplifier with negative-rail input (NRI), rail-to-rail output (RRO), and extreme-temperature operation from –55°C to 210°C. It delivers 40.7 MHz small-signal bandwidth, 353.5 V/μs slew rate, and –96 dBc HD2 at 1 kHz (1 VRMS, RL = 1 kΩ) for high-fidelity signal conditioning in down-hole drilling instrumentation.
For engineers reviewing the THS4521SHKJ datasheet, THS4521SHKJ pinout, THS4521SHKJ application, or THS4521SHKJ equivalent, this page provides verified thermal derating data, VOCM-controlled common-mode output, power-down capability (10 µA typ at 210°C), and confirmed HKJ ceramic hermetic package specifications - all validated for extended-life operation in >200°C environments.
Technical Context
The THS4521SHKJ implements a fully differential architecture with independent VOCM input enabling precise dc-coupled output common-mode control. Its NRI input stage accepts signals down to VS–, while RRO output swings within 0.09 V of VS– and 0.25 V of VS+ at 3.3 V supply.
It supports single-supply operation (2.5 V to 3.3 V), features integrated power-down (PD pin), and maintains 90 dB open-loop gain and 19.95 nV/√Hz input voltage noise at 210°C - validated via TI's extreme-temperature qualification including 1000-hour HTOL testing and electromigration-based lifetime modeling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temp Range | –55°C to +210°C - qualified for continuous operation in down-hole drilling and aerospace engine monitoring |
| Small-Signal BW | 40.7 MHz at 210°C - enables high-resolution data acquisition up to ~20 MSPS SAR ADC sampling |
| Slew Rate | 353.5 V/μs (differential, 210°C) - supports fast settling for precision pulse and step-response applications |
| HD2 / HD3 | –96 dBc / –91.5 dBc at 1 kHz (1 VRMS, RL = 1 kΩ, 210°C) - meets low-distortion requirements for seismic sensor front-ends |
| Input Voltage Noise | 19.95 nV/√Hz at 100 kHz (210°C) - preserves SNR in high-gain, low-level analog signal chains |
| Power-Down Current | 10 µA typical at 210°C - enables ultra-low-power standby in battery-constrained telemetry systems |
| Supply Voltage | 2.5 V to 3.3 V (±1.25 V to ±1.65 V) - compatible with industrial low-voltage rails and isolated DC/DC converters |
Pinout & Package
THS4521SHKJ uses an 8-pin ceramic hermetic HKJ package (JEDEC MO-179AA), designed for extreme-temperature reliability and hermetic sealing against moisture and contaminants in oil/gas and aerospace environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN– | Inverting input | Accepts single-ended or differential input; common-mode range extends to VS– (NRI) |
| VOCM | Output common-mode control | Directly sets differential output midpoint; enables dc-coupling to ADCs without level-shifting |
| VS+ | Positive supply | Supports 2.5 V–3.3 V operation; multiple VS+ pins reduce supply impedance |
| VOUT+ | Noninverting output | Rail-to-rail swing (0.09 V to 3.11 V at 3.3 V); matched to VOUT– for balanced differential drive |
| VOUT– | Inverting output | Complementary to VOUT+; output balance error ≤ –45.5 dB up to 2 MHz |
| VS– | Negative supply | Ground-referenced in single-supply config; tied internally on multi-channel variants |
| PD | Power-down enable | Logic-low activates 10 µA shutdown mode; threshold assured below 0.7 V at 210°C |
| VIN+ | Noninverting input | Full NRI support; input common-mode range: –0.1 V to 1.9 V (at 3.3 V supply) |
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) | Enables direct interface to ground-referenced sensors without level-shifting circuitry |
| Rail-to-rail output (RRO) | Maximizes dynamic range into 1-kΩ differential loads when powered from 3.3 V |
| VOCM-controlled common-mode | Permits precise dc-coupled driving of SAR and ΔΣ ADCs using only one supply rail |
| Extreme temperature qualification | Validated for 1000 hours at max rated temp; lifetime derating chart provided for 210°C junction operation |
Applications
| Down-Hole Drilling Sensors | High-Temperature Engine Monitoring |
|---|---|
Use Scenario: Signal conditioning for piezoresistive pressure transducers in oil/gas wellbores at 200°C+ ambient. IC Role / Device Role / Timing Role: Fully differential amplifier interfacing sensor bridge outputs to 24-bit ΔΣ ADCs. Use Value: NRI + RRO + VOCM control enables direct dc-coupled, low-noise amplification without external biasing or level shifters. | Use Scenario: Analog front-end for turbine exhaust gas temperature and vibration sensors in jet engines. IC Role / Device Role / Timing Role: High-speed, low-distortion driver for multiplexed SAR ADC inputs in real-time health monitoring systems. Use Value: 40.7 MHz bandwidth and –96 dBc HD2 at 210°C preserve signal fidelity during rapid thermal transients. |
| Geophysical Seismic Arrays | Aerospace Avionics Data Acquisition |
Use Scenario: Low-power, high-channel-density signal chain in portable seismic recording units deployed in desert or arctic extremes. IC Role / Device Role / Timing Role: Low-power differential driver (1.4 mA/ch) for 16–24-bit SAR ADCs in battery-operated field equipment. Use Value: 10 µA power-down current extends operational life between charges; HKJ package ensures long-term hermetic reliability. | Use Scenario: Radiation-tolerant analog signal path in satellite payload telemetry systems requiring >15-year mission life. IC Role / Device Role / Timing Role: Precision differential amplifier in redundant sensor interfaces where failure modes must be mitigated. Use Value: Controlled baseline, extended product lifecycle, and traceable manufacturing meet space-grade component assurance requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fully differential amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS4521SHKQ | Same die, identical electrical specs, but HKQ package (flatpack ceramic with different leadform) | HKQ offers alternative mounting (e.g., dead-bug) vs. HKJ's side-brazed leads; same thermal resistance to ceramic case (5.7 °C/W) | Select HKQ if board layout requires surface-mount compatibility or alternate thermal interface geometry |
| THS4521HD | D-package (SOIC-8), rated only to 175°C; 118.5 °C/W θJA vs. HKJ's 5.7 °C/W θJC to ceramic | Not suitable for >175°C operation; lacks lifetime derating chart and extreme-temp qualification | Choose only for non-extreme commercial/industrial applications where cost and PCB assembly simplicity outweigh temperature needs |
Compared with THS4521SHKQ and THS4521HD, THS4521SHKJ uniquely combines 210°C operation, hermetic HKJ packaging, and validated lifetime performance per Figure 1 - making it the sole option for sustained deployment in down-hole, engine-core, or geothermal sensing.
Availability
THS4521SHKJ is available at Aetrix Electronics and suitable for down-hole drilling instrumentation, high-temperature engine monitoring, and geophysical seismic arrays requiring stable component supply across extended temperature lifecycles.
Supply support for THS4521SHKJ 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 high-reliability components for industrial, automotive, and aerospace markets.
The THS4521 product line was engineered specifically for extreme-temperature signal conditioning - delivering fully differential amplification with NRI, RRO, and VOCM control in hermetically sealed packages qualified to 210°C.
FAQ
What is the maximum continuous junction temperature for THS4521SHKJ?
The THS4521SHKJ has a maximum continuous junction temperature of 217°C, with guaranteed long-term reliability validated up to 210°C ambient via TI's electromigration-based lifetime model and 1000-hour HTOL testing. Figure 1 in the SBOS548D datasheet provides derating curves for output load and lifetime at elevated temperatures - critical for THS4521SHKJ deployment in down-hole tools.
Does THS4521SHKJ support true single-supply operation?
Yes, THS4521SHKJ supports true single-supply operation from 2.5 V to 3.3 V (VS– = 0 V, VS+ = 2.5 V–3.3 V). Its negative-rail input (NRI) accepts signals down to 0 V, and rail-to-rail output (RRO) swings from 0.09 V to 3.11 V at 3.3 V supply - enabling direct interface to ground-referenced sensors and ADCs without external bias networks.
How is output common-mode voltage controlled on THS4521SHKJ?
THS4521SHKJ uses the VOCM pin to directly set the differential output's common-mode voltage. When VOCM is driven to a specific voltage (e.g., 1.65 V for midsupply), the output common-mode is regulated to that value with ±0.7 mV offset at 210°C. With VOCM open, default output common-mode is (VS+ – VS–)/2 ±0.6 mV - ensuring predictable dc-coupled behavior into ADCs.
What is the power-down behavior of THS4521SHKJ at 210°C?
At 210°C, THS4521SHKJ enters low-power mode when the PD pin is pulled below 0.7 V (assured off threshold), drawing 10 µA typical quiescent current. Turn-off delay is 144.5 ns, and turn-on delay is 99 ns - preserving fast wake-up response in duty-cycled telemetry systems. The PD pin bias current remains ≤1 µA across temperature, minimizing control-line loading.
Is THS4521SHKJ pin-compatible with other THS4521 variants?
Yes, THS4521SHKJ shares identical pinout and functionality with THS4521SHKQ and THS4521HD - all follow the standard 8-pin configuration defined in the TERMINAL FUNCTIONS table (VIN–, VOCM, VS+, VOUT+, VOUT–, VS–, PD, VIN+). However, HKJ and HKQ are ceramic hermetic packages, while HD is SOIC-8 - so PCB footprint and thermal design differ despite pin equivalence.
THS4521SHKJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-CFlatPack
- Packaging:
- Bulk
- 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:
- 8-CFP
THS4521SHKJ FAQ
1.How can I place an order for THS4521SHKJ through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4521SHKJ 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 THS4521SHKJ reliable?
The price and inventory of THS4521SHKJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4521SHKJ is usually 5 days.
3.What payment methods are accepted for THS4521SHKJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4521SHKJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4521SHKJ?
THS4521SHKJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4521SHKJ 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 THS4521SHKJ?
For technical support, including THS4521SHKJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4521SHKJ requirements.
6.How does Aetrix verify that THS4521SHKJ is sourced from the original manufacturer or authorized distributors?
All THS4521SHKJ 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 THS4521SHKJ meets industry standards.
7.What is the process for return or replacement of THS4521SHKJ?
All THS4521SHKJ units undergo pre-shipment inspection (PSI). If there is an issue with THS4521SHKJ, 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 THS4521SHKJ part is unused and in its original packaging.
Return procedure for THS4521SHKJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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