My Inquiry
My Account
Texas Instruments SN74AHCT125QDREP
- Part No.:
- SN74AHCT125QDREP
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74AHCT125QDREP.pdf
- Description:
- IC BUF NON-INVERT 5.5V 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74AHCT125QDREP from Texas Instruments is a quadruple 3-state bus buffer gate with independent enable control per channel, operating at 4.5–5.5 V supply, supporting −40°C to 125°C extended temperature range, TTL-compatible inputs, and 8 mA output drive - used in industrial backplane interface and level-shifting data buses.
For engineers reviewing the SN74AHCT125QDREP datasheet, SN74AHCT125QDREP pinout, SN74AHCT125QDREP application, or SN74AHCT125QDREP equivalent, key selection considerations include 3-state timing (tPZL/tPHZ ≤ 6 ns @ 15 pF), SOIC-14 package thermal resistance (θJA = 86°C/W), input clamp rating (±20 mA), and guaranteed high-impedance during power sequencing via OE pull-up.
Technical Context
This device implements four noninverting buffer channels, each with dedicated active-low output-enable (OE) control. Each channel transitions between low-impedance pass-through (OE = L) and high-impedance tri-state (OE = H), enabling bidirectional bus sharing without external direction control logic.
It uses AHCT logic family silicon with CMOS inputs and TTL-voltage-compatible thresholds (VIH = 2 V min, VIL = 0.8 V max), ensuring interoperability with legacy 5-V TTL systems while maintaining CMOS power efficiency. Absolute maximum ratings include 7-V supply tolerance and ±25 mA continuous output current per pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage (VCC) | 4.5 V to 5.5 V - ensures compatibility with regulated 5-V industrial rails and immunity to brownout below 4.5 V. |
| Operating Temperature | −40°C to 125°C - qualified for under-hood automotive, motor control, and harsh-environment industrial use. |
| Output Drive (IOL/IOH) | ±8 mA - sufficient to drive standard 50-pF loads with <8.5 ns propagation delay, supporting multi-drop bus loading. |
| Input Compatibility | TTL-voltage compatible (VIH ≥ 2 V, VIL ≤ 0.8 V) - interfaces directly with legacy 74LS/74ALS without level shifters. |
| 3-State Enable Timing | tPZL/tPHZ ≤ 6 ns (CL = 15 pF) - enables fast bus arbitration and minimizes contention windows in shared-data systems. |
| ESD Protection | ≥2000 V HBM, ≥200 V MM - exceeds JEDEC JS-001 requirements for assembly-line robustness and field reliability. |
| Power Dissipation Cap. | Cpd = 14 pF - enables accurate dynamic power estimation at 1 MHz switching for thermal design. |
Pinout & Package
SN74AHCT125QDREP is housed in a 14-pin SOIC (D) package with 1.27 mm pitch, 8.75 mm × 3.91 mm body, and 1.75 mm max height - optimized for automated placement and reflow compatibility per IPC-7351 land pattern.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | OE (Active-Low Output Enable) | Independent per-channel enable; tie to VCC via pull-up resistor to guarantee high-Z at power-up. |
| 2, 5, 11, 14 | A (Data Input) | Noninverting input per buffer; TTL-compatible threshold ensures reliable logic capture from legacy sources. |
| 3, 6, 12, 9 | Y (Buffered Output) | 3-state output; sinks or sources up to 8 mA while maintaining VOL ≤ 0.44 V and VOH ≥ 3.8 V. |
| 7 | GND | Ground reference for all I/O and internal logic; requires low-inductance connection to minimize ground bounce. |
| 14 | VCC | Positive supply rail; decoupling capacitor (0.1 µF ceramic) required within 5 mm for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Quadruple independent buffers | Four isolated channels allow selective bus segment control without cross-talk or timing coupling. |
| Extended temperature qualification | JEDEC-compliant HAST, temperature cycling, and bond intermetallic testing ensure 125°C operation reliability. |
| Controlled baseline manufacturing | Single assembly/test site and single fabrication site reduce parametric drift and supply chain variability. |
| 3-state output leakage (IOZ) | ±2.5 µA max at VCC = 5.5 V - prevents unintended bus loading during high-Z state in low-power sleep modes. |
| Input transition rate limit | 20 ns/V - prevents false triggering from slow-rising signals common in long-trace or capacitive-load environments. |
Applications
| Industrial PLC Backplane Interface | Automotive Body Control Module (BCM) Data Routing |
|---|---|
Use Scenario: Isolating and buffering address/data lines between microcontroller and multiple peripheral ICs on a noisy 24-V industrial backplane. IC Role / Device Role / Timing Role: Bidirectional bus driver with per-line 3-state control, enabling time-multiplexed access to EEPROM, ADC, and I/O expanders. Use Value: Prevents signal contention during hot-swap events and reduces ground bounce via controlled 8 mA drive strength and 6 ns disable timing. |
Use Scenario: Level-shifting and isolating LIN or CAN subsystem diagnostic lines connected to a central BCM MCU. IC Role / Device Role / Timing Role: Logic-level translator and bus isolator, accepting 5-V MCU outputs and driving 5-V sensor interface ICs with TTL-compatible thresholds. Use Value: Eliminates need for discrete level-shifters; −40°C to 125°C rating supports engine bay mounting without derating. |
| Test Equipment Signal Gating | Medical Imaging Sensor Interface |
Use Scenario: Enabling/disabling analog-to-digital converter (ADC) sample clock distribution paths during self-test sequences. IC Role / Device Role / Timing Role: Precision timing gate with sub-7 ns enable/disable latency, synchronizing clock delivery only to active ADC channels. Use Value: Reduces EMI by disabling unused clock paths; IOZ leakage <2.5 µA avoids DC offset errors in precision measurement front-ends. |
Use Scenario: Buffering serial configuration commands from FPGA to radiation-hardened image sensor arrays in portable X-ray units. IC Role / Device Role / Timing Role: Robust command-line repeater with enhanced ESD protection (2000 V HBM), shielding sensitive sensor registers from handling-induced transients. Use Value: Ensures command integrity across 1.5 m flex cables; qualified DMS support guarantees long-term component availability for Class II medical devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AHCT125QPWREP | TSSOP-14 package (1.2 mm height, 4.4 mm width); θJA = 113°C/W vs. 86°C/W for SOIC. | Better PCB area efficiency but higher thermal resistance; requires tighter layout control for same power dissipation. | Select when board space is constrained and ambient temperature remains ≤85°C; verify reflow profile matches Level-1 MSL. |
| SN74AHCT125-Q1 | Automotive AEC-Q100 Grade 1 (−40°C to 125°C); additional qualification including HTOL and ESD per ISO 10605. | Required for ASIL-B safety-critical domains; includes full PPAP documentation and lot traceability. | Choose for automotive production where functional safety compliance (e.g., ISO 26262) is mandated; not drop-in due to different part marking and test reporting. |
Compared with SN74AHCT125QDREP, the TSSOP variant trades thermal performance for footprint reduction, while the Q1 version adds automotive-specific reliability validation - neither offers pin-to-pin replacement without layout or qualification review.
Availability
SN74AHCT125QDREP is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and medical instrumentation requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SN74AHCT125QDREP 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 logic solutions, with over 90 years of innovation in industrial, automotive, and aerospace electronics.
The SN74AHCT125QDREP belongs to TI's enhanced-product (EP) logic family, designed specifically for high-reliability applications demanding extended temperature operation, controlled manufacturing, and long-term supply assurance.
FAQ
What is the recommended pull-up resistor value for OE pins on SN74AHCT125QDREP?
The minimum OE pull-up resistor value for SN74AHCT125QDREP is determined by the current-sinking capability of the driver controlling OE. TI specifies that OE must be tied to VCC through a pull-up resistor to ensure high-impedance state during power-up; typical values range from 4.7 kΩ to 10 kΩ for standard 5-V logic drivers. Always verify against the source driver's IOL rating to avoid violating the 20 mA absolute max clamp current limit.
Does SN74AHCT125QDREP support mixed-voltage operation between 3.3 V and 5 V systems?
SN74AHCT125QDREP does not support true mixed-voltage operation: its VCC must be 4.5–5.5 V, and inputs are TTL-voltage compatible (VIH ≥ 2 V, VIL ≤ 0.8 V), allowing reliable interfacing with 3.3-V CMOS outputs only if those outputs meet TTL thresholds. It cannot accept 3.3-V logic levels as valid inputs unless they exceed 2 V for HIGH or fall below 0.8 V for LOW - direct connection to unbuffered 3.3-V GPIO may result in marginal or undefined switching.
What is the maximum capacitive load SN74AHCT125QDREP can drive while maintaining specified timing?
SN74AHCT125QDREP is characterized for CL = 15 pF and CL = 50 pF loads. At 15 pF, tPLH/tPHL ≤ 5.5 ns and tPZL/tPHZ ≤ 6 ns; at 50 pF, delays increase to ≤8.5 ns and ≤10 ns respectively. Driving >50 pF violates the specified switching characteristics - for heavier loads, add series termination or consider a higher-drive buffer like SN74ALVC16244.
Is SN74AHCT125QDREP RoHS compliant and lead-free?
Yes, SN74AHCT125QDREP is RoHS compliant and features NiPdAu (NIPDAU) lead finish, as confirmed in TI's Package Option Addendum. It meets JEDEC J-STD-020 moisture sensitivity Level-1 (unlimited floor life at ≤30°C/60% RH) and is rated for peak reflow at 260°C - fully compatible with standard lead-free soldering processes.
How does SN74AHCT125QDREP differ from commercial-grade SN74AHCT125?
SN74AHCT125QDREP is the enhanced-product (EP) variant of SN74AHCT125, featuring controlled baseline manufacturing (single fab/assembly site), extended temperature qualification (−40°C to 125°C), enhanced DMS support, and full JEDEC pedigree testing (HAST, temperature cycling, electromigration). The commercial SN74AHCT125 is rated only for 0°C to 70°C and lacks EP-specific reliability documentation and long-term supply guarantees.
SN74AHCT125QDREP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 4
- Number of Bits per Element:
- 1
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 8mA, 8mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
SN74AHCT125QDREP FAQ
1.How can I place an order for SN74AHCT125QDREP through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT125QDREP 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 SN74AHCT125QDREP reliable?
The price and inventory of SN74AHCT125QDREP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT125QDREP is usually 5 days.
3.What payment methods are accepted for SN74AHCT125QDREP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHCT125QDREP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHCT125QDREP?
SN74AHCT125QDREP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHCT125QDREP 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 SN74AHCT125QDREP?
For technical support, including SN74AHCT125QDREP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT125QDREP requirements.
6.How does Aetrix verify that SN74AHCT125QDREP is sourced from the original manufacturer or authorized distributors?
All SN74AHCT125QDREP 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 SN74AHCT125QDREP meets industry standards.
7.What is the process for return or replacement of SN74AHCT125QDREP?
All SN74AHCT125QDREP units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT125QDREP, 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 SN74AHCT125QDREP part is unused and in its original packaging.
Return procedure for SN74AHCT125QDREP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74AHCT125QDREP 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…
