My Inquiry
My Account
Texas Instruments CD54HC125F
- Part No.:
- CD54HC125F
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
CD54HC125F.pdf
- Description:
- CD54HC125 HIGH SPEED CMOS LOGIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,112
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
CD54HC125F from Texas Instruments is a high-speed CMOS quad buffer with independent three-state outputs and separate output enable inputs per channel, operating from 2V to 6V across -55°C to +125°C, delivering 20ns typical propagation delay (VCC = 4.5V, CL = 50pF) and ±25mA output drive for bus interface isolation in military-grade data acquisition systems.
For engineers reviewing the CD54HC125F datasheet, CD54HC125F pinout, CD54HC125F application, or CD54HC125F equivalent, key selection criteria include its CERDIP package compatibility with harsh-environment PCB layouts, guaranteed three-state leakage ≤±5µA at -55°C to +125°C, and LSTTL fanout support of 10 loads - critical for legacy system upgrades requiring radiation-tolerant logic buffering.
Technical Context
The CD54HC125F implements four identical non-inverting buffers, each with dedicated active-low output enable (nOE) control that places the corresponding output (nY) into high-impedance state when asserted HIGH. Its HC logic family ensures CMOS input compatibility (II ≤1µA) and high noise immunity (NIL/NIH = 30% of VCC at 5V).
Designed for military applications, it meets MIL-PRF-38535 Class B requirements with hermetically sealed ceramic dual in-line package (CERDIP), rated for operation from -55°C to +125°C and featuring absolute maximum ratings including VCC up to 7V and junction temperature up to 150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | HC (High-Speed CMOS), 2V–6V supply range - enables direct replacement of obsolete TTL in wide-input-voltage legacy systems |
| Operating Temperature | -55°C to +125°C - qualified for military-grade embedded control and avionics data buses |
| Propagation Delay | 25ns max (VCC = 4.5V, CL = 50pF, TA = -55°C to +125°C) - ensures deterministic timing in synchronous bus arbitration |
| Output Drive | ±25mA per output - supports direct connection to 10 LSTTL loads without external drivers |
| Three-State Leakage | ±5µA max (TA = -55°C to +125°C) - guarantees signal integrity during bus contention or hot-swap events |
| Input Thresholds | VIH = 1.5V min (VCC = 2V), VIL = 0.5V max (VCC = 2V) - provides robust noise margin in electrically noisy platforms |
| Power Dissipation Cap. | CPD = 29pF - enables accurate dynamic power estimation (PD = VCC² × fi × (CPD + CL)) for thermal design |
Pinout & Package
CD54HC125F uses a 14-lead Ceramic Dual In-Line Package (CERDIP), hermetically sealed per MIL-STD-1835 GDIP1-T14, with 0.3-inch body width, 0.100-inch lead pitch, and maximum height of 5.08 mm - optimized for high-reliability board-level mounting in vibration-prone environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 5, 9, 13, 12 | Input (1A, 2A, 3A, 4A) / Output Enable (1OE, 2OE, 3OE, 4OE) | Dedicated per-channel control: nA feeds buffer input; nOE HIGH forces nY into high-Z - enables independent bus segment gating |
| 3, 6, 11, 2 | Output (1Y, 2Y, 3Y, 4Y) | Non-inverting buffered outputs with three-state capability - allows bidirectional bus sharing without external direction control |
| 7 | GND | Ground reference for all logic and output stages - requires low-inductance connection to minimize ground bounce in fast-switching operation |
| 14 | VCC | Positive supply (2V–6V) powering internal logic and output drivers - decoupling capacitor mandatory within 1 cm due to CERDIP's higher inductance vs. plastic packages |
Key Features
| Feature | Design Value |
|---|---|
| Independent three-state control per buffer | Enables selective bus isolation without disabling entire device - critical for fault-tolerant memory-mapped I/O architectures |
| Wide supply voltage range (2V–6V) | Supports interoperability across mixed-voltage subsystems (e.g., 3.3V logic interfacing to 5V backplane) without level shifters |
| High noise immunity (30% VCC) | Ensures reliable operation in EMI-heavy environments like radar front-ends or motor drive controllers |
| Military temperature range (-55°C to +125°C) | Validated performance across full operational envelope - eliminates derating calculations for aerospace launch or desert-deployed systems |
| Low quiescent current (80µA max) | Reduces standby power in battery-backed instrumentation - extends mission duration without compromising speed |
Applications
| Avionics Data Bus Interface | Tactical Radio Baseband Processing |
|---|---|
Use Scenario: Isolating ARINC 429 transmitter/receiver lines during mode switching in flight control computers. IC Role / Device Role / Timing Role: Quad buffer provides channelized enable-controlled signal routing between FPGA-based protocol engines and discrete transceivers. Use Value: Independent OE pins allow glitch-free reconfiguration of data paths while maintaining bus integrity under MIL-STD-704 power transients. |
Use Scenario: Level-shifting and bus driving between 3.3V DSP cores and 5V analog front-end ICs in software-defined radios. IC Role / Device Role / Timing Role: Non-inverting buffer stage with three-state outputs manages shared ADC/DAC data lanes during calibration sequences. Use Value: 2V–6V operation eliminates need for external translators; ±25mA drive sustains signal fidelity over 15cm PCB traces. |
| Secure Military Crypto Module | Spacecraft Onboard Telemetry Hub |
Use Scenario: Enabling/disabling secure key exchange interfaces between tamper-detect ASICs and host processors in FIPS 140-2 compliant hardware. IC Role / Device Role / Timing Role: Three-state gate prevents unauthorized probing of cryptographic bus signals during idle states. Use Value: ≤±5µA leakage at -55°C ensures no detectable current signature during cold-soak storage or orbital eclipse phases. |
Use Scenario: Multiplexing sensor telemetry streams (temperature, radiation, attitude) onto a common MIL-STD-1553B stub bus in satellite payload modules. IC Role / Device Role / Timing Role: Buffer isolates sensor microcontrollers from bus loading effects while enabling time-sliced data injection. Use Value: CERDIP packaging withstands total ionizing dose (TID) >100 krad(Si); propagation delay stability ensures jitter <1ns across thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad three-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD54HCT125F3A | LSTTL-compatible inputs (VIH = 2V min, VIL = 0.8V max); 4.5V–5.5V only supply range | Required where interfacing directly to legacy 5V TTL logic without level translation | Select when system uses strict 5V LSTTL signaling and cannot tolerate HC-family input thresholds |
| CD74HC125M | Same HC logic, but SOIC-14 package; commercial/military temp (-55°C to +125°C), RoHS-compliant | Suitable for cost-sensitive or volume production where hermetic sealing is not mandated | Choose for non-military industrial designs needing same electrical specs with surface-mount assembly efficiency |
Compared with CD54HC125F, CD54HCT125F3A offers tighter input compatibility with legacy TTL but sacrifices supply flexibility, while CD74HC125M retains identical logic behavior in a smaller, non-hermetic package - making CD54HC125F the sole choice for applications demanding both wide-VCC operation and CERDIP reliability.
Availability
CD54HC125F is available at Aetrix Electronics and suitable for avionics data bus interface, tactical radio baseband processing, and secure military crypto module applications requiring stable component supply with guaranteed long-term obsolescence management.
Supply support for CD54HC125F 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, with decades of heritage in military and aerospace component qualification.
The CD54HC125F belongs to TI's military-grade HC logic family, engineered specifically for extreme-environment digital interfacing where hermetic sealing, extended temperature operation, and radiation-tolerant design are mandatory.
FAQ
What is the maximum supply voltage rating for CD54HC125F?
The CD54HC125F has an absolute maximum DC supply voltage (VCC) rating of 7V, though its functional operating range is specified from 2V to 6V. Exceeding 7V risks permanent damage per Absolute Maximum Ratings. The CD54HC125F must be operated within 2V–6V for guaranteed logic behavior, timing, and output drive compliance across -55°C to +125°C.
Does CD54HC125F support 3.3V logic systems?
Yes, CD54HC125F fully supports 3.3V operation: its HC logic family is rated for VCC = 2V to 6V, and input thresholds scale with supply (e.g., VIH ≥1.5V at VCC = 3.3V). At 3.3V, CD54HC125F delivers 22ns typical propagation delay and maintains ±25mA output drive - making it ideal for bridging 3.3V FPGAs to 5V peripherals without level shifters.
What is the pinout configuration of CD54HC125F?
The CD54HC125F uses a standard 14-pin CERDIP package with pin 1 as 1OE, pin 2 as 1Y, pin 3 as 1A, pin 4 as 2OE, pin 5 as 2A, pin 6 as 2Y, pin 7 as GND, pin 8–14 as 3Y, 3OE, 3A, 4Y, 4OE, 4A, VCC respectively. This layout matches JEDEC MS-012 and MIL-STD-1835 GDIP1-T14, ensuring drop-in compatibility with legacy military PCB footprints.
How does CD54HC125F differ from CD74HC125E?
CD54HC125F and CD74HC125E share identical logic functionality and electrical specs, but CD54HC125F uses a hermetically sealed CERDIP package qualified to MIL-PRF-38535 Class B for military use, whereas CD74HC125E uses a plastic PDIP package rated for commercial/military temperature range but not hermetic. CD54HC125F is required for applications demanding moisture resistance and enhanced reliability in harsh environments.
Is CD54HC125F compatible with LSTTL input levels?
No, CD54HC125F is not directly compatible with standard LSTTL input levels: its HC inputs require VIH ≥1.5V at VCC = 2V (scaling to ~3.15V at 4.5V), while LSTTL outputs typically drive only 2.4V high. For LSTTL interface, use CD54HCT125F3A instead - its HCT variant guarantees VIH ≥2.0V and VIL ≤0.8V at 4.5V–5.5V, matching LSTTL output specs directly.
CD54HC125F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54HC
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
CD54HC125F FAQ
1.How can I place an order for CD54HC125F through Aetrix?
Please submit a Request for Quotation (RFQ) for CD54HC125F 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 CD54HC125F reliable?
The price and inventory of CD54HC125F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD54HC125F is usually 5 days.
3.What payment methods are accepted for CD54HC125F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD54HC125F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD54HC125F?
CD54HC125F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD54HC125F 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 CD54HC125F?
For technical support, including CD54HC125F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD54HC125F requirements.
6.How does Aetrix verify that CD54HC125F is sourced from the original manufacturer or authorized distributors?
All CD54HC125F 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 CD54HC125F meets industry standards.
7.What is the process for return or replacement of CD54HC125F?
All CD54HC125F units undergo pre-shipment inspection (PSI). If there is an issue with CD54HC125F, 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 CD54HC125F part is unused and in its original packaging.
Return procedure for CD54HC125F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CD54HC125F Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
