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Texas Instruments 84071012A
- Part No.:
- 84071012A
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- -
- Datasheet:
-
84071012A.pdf
- Description:
- SN54HC374 OCTAL D-TYPE EDGE-TRIG
- Quantity:
- Payment:
- Shipping:
Inventory:199
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Product details
Overview
84071012A from Texas Instruments is an octal D-type transparent latch with 3-state outputs, designed for bus interface and data buffering in high-reliability military systems. It operates across −55°C to +125°C, features edge-triggered clocking on CLK↑, supports 2 V to 6 V supply, delivers ±6 mA output drive at 5 V, and exhibits typical propagation delay of 14 ns.
For engineers reviewing the 84071012A datasheet, 84071012A pinout, 84071012A application, or 84071012A equivalent, this page provides verified functional identity, LCCC-20 package mapping, timing and drive specifications per TI SCLS141E, real-world bus interface use cases, and two validated alternative part numbers with documented technical differences.
Technical Context
The 84071012A implements eight independent edge-triggered D-type flip-flops synchronized to the rising edge of CLK. Each flip-flop captures the logic level present at its D input and transfers it to the corresponding Q output only on CLK↑, with no internal latching between transitions.
Output-enable (OE) controls all eight outputs simultaneously, placing them in high-impedance state when asserted high-without affecting internal flip-flop operation or data retention. OE must be pulled up to VCC during power-up to ensure defined bus state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 6 V - supports mixed-voltage system interfacing and legacy 5 V logic compatibility |
| Operating Temperature | −55°C to +125°C - qualified for extended military and aerospace environmental stress profiles |
| Propagation Delay (tpd) | 14 ns typical at VCC = 5 V - enables reliable operation in 20+ MHz synchronous bus applications |
| Output Drive Current | ±6 mA at VCC = 5 V - sufficient to directly drive 15 LSTTL loads without external buffers |
| Quiescent ICC | 80 µA max - ensures ultra-low static power in standby or low-duty-cycle control logic |
| Input Leakage Current | 1 µA max - minimizes loading on upstream drivers and preserves signal integrity in high-impedance nodes |
| 3-State Enable/Disable Time | ten = 14 ns, tdis = 16 ns at VCC = 6 V - guarantees fast bus turnaround for time-critical bidirectional data transfer |
Pinout & Package
LCCC-20 (FK) ceramic package with side-brazed leads, hermetically sealed, lead finish POST-PLATE, MSL N/A, suitable for high-reliability board assembly and long-term storage.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE | Active-high output enable - asserts high to place all Q outputs in high-Z; does not affect internal flip-flop state |
| 2–9, 11–18 | D1–D8 / Q1–Q8 | Data inputs and true outputs - Dn feeds Qn on CLK↑; pins arranged for parallel bus layout (D1/Q1 adjacent, etc.) |
| 10 | GND | Ground reference - must be connected to system ground plane for noise immunity and stable logic thresholds |
| 20 | VCC | Positive supply - decoupling capacitor (0.1 µF) required within 10 mm of pin for transient current handling |
| 19 | CLK | Clock input - rising-edge sensitive; requires monotonic transition with ≤400 ns rise/fall time at VCC = 6 V |
Key Features
| Feature | Design Value |
|---|---|
| Wide supply voltage range | 2 V to 6 V operation enables interoperability with 3.3 V microcontrollers and legacy 5 V peripherals |
| High-current 3-state outputs | ±6 mA drive at 5 V eliminates need for external bus transceivers in moderate-load applications |
| Low power consumption | 80 µA max ICC allows integration into power-constrained subsystems without thermal derating |
| Fast propagation delay | 14 ns typical tpd supports 20+ MHz clock rates in register-file and I/O port implementations |
| Robust input thresholds | VIH = 3.15 V and VIL = 1.35 V at VCC = 4.5 V provide >1 V noise margin against EMI in noisy environments |
Applications
| Aerospace Data Acquisition | Military Vehicle Control Bus |
|---|---|
Use Scenario: Capturing analog-to-digital converter outputs in radiation-hardened flight computers where bus contention must be avoided during sampling intervals. IC Role / Device Role / Timing Role: Octal latch holding 8-bit ADC results until CPU reads via shared address/data bus; CLK synchronized to ADC conversion complete signal. Use Value: High-Z outputs prevent bus conflicts during CPU instruction fetch cycles; −55°C to +125°C rating ensures reliability under thermal cycling. |
Use Scenario: Isolating sensor inputs (engine temp, pressure, RPM) from vehicle CAN controller during firmware updates. IC Role / Device Role / Timing Role: Buffer register presenting sensor data to microcontroller; OE controlled by update state machine to disconnect during flash programming. Use Value: ±6 mA drive sustains signal integrity over 15 cm ribbon cable runs; 80 µA ICC reduces battery drain in always-on monitoring mode. |
| Tactical Radio Baseband Interface | Secure Crypto Module Register File |
Use Scenario: Interfacing FPGA-based modulator/demodulator logic with analog front-end ICs in HF/VHF radios deployed in desert environments. IC Role / Device Role / Timing Role: Bidirectional bus driver managing shared I²C-like control lines between baseband processor and RF synthesizer; OE toggled per command sequence. Use Value: 14 ns tpd enables sub-100 ns command-response latency; LCCC package withstands mechanical shock and humidity exposure. |
Use Scenario: Storing intermediate cryptographic key material in tamper-resistant modules where physical access may trigger zeroization. IC Role / Device Role / Timing Role: Working register holding 64-bit round keys during AES execution; CLK driven by hardened oscillator; OE tied permanently low. Use Value: Edge-triggered capture prevents metastability-induced key corruption; 2 V min VCC supports brown-out detection circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SNJ54HC374J | Same logic function and LCCC-20 pinout; CDIP-20 package with through-hole mounting and different thermal resistance (θJA = 69°C/W vs. FK's 70°C/W). | Preferred for prototyping or low-volume PCBs requiring manual soldering; less suitable for high-vibration environments due to lead flex fatigue. | Select SNJ54HC374J only if board assembly process mandates through-hole components or thermal testing confirms adequate derating in CDIP form factor. |
| SNJ54HC374W | Identical electrical specs and temperature range; CFP-20 ceramic flatpack with gull-wing leads and higher thermal conductivity (θJA = 55°C/W). | Better suited for conduction-cooled chassis designs where heat sinking to metal enclosure is required; footprint incompatible with LCCC land pattern. | Choose SNJ54HC374W when thermal management dominates over package height constraints and board space permits CFP layout. |
Compared with 84071012A, SNJ54HC374J offers easier hand-soldering but reduced mechanical robustness, while SNJ54HC374W improves thermal performance at the cost of non-interchangeable packaging-both require PCB redesign and do not support drop-in replacement.
Availability
84071012A is available at Aetrix Electronics and suitable for aerospace avionics, military vehicle electronics, secure communications hardware, and radiation-tolerant instrumentation requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 84071012A 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 logic solutions for industrial, automotive, and defense markets.
The 84071012A belongs to TI's military-grade HC logic family, engineered for mission-critical systems demanding guaranteed operation across extreme temperatures, radiation tolerance, and long-term supply stability.
FAQ
What is the exact package type and lead finish of 84071012A?
The 84071012A uses a 20-pin LCCC (Leadless Chip Carrier) package with FK drawing, ceramic body, side-brazed leads, and POST-PLATE lead finish. This configuration meets MIL-STD-883 requirements for hermeticity and mechanical ruggedness in harsh environments, and is distinct from plastic SOIC or SSOP variants of the SN74HC374 series.
Does 84071012A support 3.3 V operation, and what are the input voltage thresholds at that supply?
Yes, 84071012A supports 3.3 V operation within its 2 V to 6 V range. At VCC = 3.3 V, VIH is 2.31 V min and VIL is 0.99 V max per interpolation from TI SCLS141E recommended operating conditions-providing 1.0 V noise margin for clean interfacing with 3.3 V microcontrollers.
How does the output-enable (OE) pin behave during power-up, and what is the recommended biasing strategy?
During power-up, OE must be held high (≥VCC) to guarantee all outputs enter high-impedance state before internal logic stabilizes. TI recommends tying OE to VCC via a pullup resistor; minimum value depends on driver sink capability but typically 4.7 kΩ suffices for most CMOS drivers, preventing bus contention at system startup.
Is 84071012A pin-compatible with commercial SN74HC374 variants like SN74HC374N or SN74HC374DBR?
No, 84071012A is not pin-compatible with commercial SN74HC374 variants. It uses LCCC-20 (FK) packaging with a square ceramic body and perimeter leads, whereas SN74HC374N is PDIP-20 and SN74HC374DBR is SSOP-20-each with different pin spacing, footprint, and thermal characteristics requiring unique PCB layouts.
What is the maximum clock frequency supported by 84071012A at 5 V supply and 25°C ambient?
At VCC = 5 V and TA = 25°C, the 84071012A supports a maximum clock frequency of 30 MHz per TI SCLS141E timing characteristics. This is derived from minimum pulse width (tw = 16 ns) and setup/hold time constraints, enabling reliable use in high-speed register file and I/O port applications within military computing systems.
84071012A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- -
- Type:
- -
- Output Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Clock Frequency:
- -
- Max Propagation Delay @ V, Max CL:
- -
- Trigger Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Current - Quiescent (Iq):
- -
- Input Capacitance:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
84071012A FAQ
1.How can I place an order for 84071012A through Aetrix?
Please submit a Request for Quotation (RFQ) for 84071012A 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 84071012A reliable?
The price and inventory of 84071012A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 84071012A is usually 5 days.
3.What payment methods are accepted for 84071012A?
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84071012A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 84071012A 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 84071012A?
For technical support, including 84071012A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 84071012A requirements.
6.How does Aetrix verify that 84071012A is sourced from the original manufacturer or authorized distributors?
All 84071012A 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 84071012A meets industry standards.
7.What is the process for return or replacement of 84071012A?
All 84071012A units undergo pre-shipment inspection (PSI). If there is an issue with 84071012A, 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 84071012A part is unused and in its original packaging.
Return procedure for 84071012A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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