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Texas Instruments SN74AHC125PWRE4
- Part No.:
- SN74AHC125PWRE4
- Manufacturer:
- Texas Instruments
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHC125PWRE4.pdf
- Description:
- IC BUF NON-INVERT 5.5V 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,545
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Product details
Overview
SN74AHC125PWRE4 from Texas Instruments is a quadruple 3-state bus buffer gate IC with independent output-enable control per channel, operating from 2 V to 5.5 V supply, delivering ±8 mA output drive at 5 V, and supporting industrial temperature range (–40°C to 125°C) in a 14-pin TSSOP package. It enables bidirectional signal isolation in microcontroller GPIO expansion and digital multiplexing applications.
For engineers reviewing the SN74AHC125PWRE4 datasheet, SN74AHC125PWRE4 pinout, SN74AHC125PWRE4 application, or SN74AHC125PWRE4 equivalent, key selection criteria include individual OE control per buffer, 3-state output behavior, low propagation delay (≤6.5 ns at 5 V), high noise immunity, and compatibility with mixed-voltage logic systems.
Technical Context
The SN74AHC125PWRE4 implements four independent CMOS buffer gates, each with dedicated active-low output-enable (OE) input. When OE is low, the A→Y path is enabled with rail-to-rail logic transfer; when OE is high, Y enters high-impedance state. This architecture supports dynamic bus sharing and signal routing without contention.
Each buffer operates under identical electrical specifications: VIH/VIL thresholds scale with VCC (e.g., VIH = 3.85 V at VCC = 5.5 V), output switching is characterized for CL = 15 pF and CL = 50 pF loads, and power supply rejection maintains stable VOH/VOL across voltage and temperature extremes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 5.5 V - supports direct interface with 2.5 V, 3.3 V, and 5 V logic families without level shifters. |
| Output Drive Strength | ±8 mA at VCC = 5 V - sufficient to drive standard TTL loads and moderate capacitive buses (≤50 pF). |
| Propagation Delay | ≤6.5 ns (A→Y, VCC = 5 V, CL = 15 pF) - enables use in sub-100 MHz digital control paths. |
| 3-State Enable/Disable Time | tPZL/tPHZ ≤ 8 ns (VCC = 5 V, CL = 15 pF) - ensures fast bus release and prevents glitches during state transitions. |
| Input Leakage Current | ±1 µA max (–40°C to 125°C) - guarantees reliable high-impedance hold on unused inputs without external pull resistors. |
| ESD Rating | ±1500 V HBM - meets industrial handling requirements without additional protection circuitry. |
| Operating Temperature | –40°C to 125°C - qualified for motor drives, PoE injectors, and industrial PLC environments. |
Pinout & Package
Packaged in a 14-pin Thin Shrink Small Outline Package (TSSOP), SN74AHC125PWRE4 measures 5.00 mm × 4.40 mm with 0.65 mm lead pitch and exposed pad for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 (OE1–OE4) | Active-low output enable | Individually disables corresponding buffer output into high-Z; must be pulled to VCC via resistor during power-up to prevent floating outputs. |
| 2, 5, 9, 12 (A1–A4) | Buffer input | Accepts CMOS-level signals; VIH/VIL thresholds track VCC, enabling mixed-voltage system integration. |
| 3, 6, 8, 11 (Y1–Y4) | Buffer output | 3-state CMOS output with ±8 mA drive; high-Z state isolates downstream circuits during disable. |
| 7 | GND | Ground reference for all logic and output stages; requires low-inductance connection to minimize ground bounce. |
| 14 | VCC | Primary power supply; bypass capacitor (0.1 µF) required adjacent to pin to suppress switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| Independent output-enable control | Four separate OE pins allow selective activation of individual buffers-enabling dynamic signal routing and GPIO multiplexing without software overhead. |
| Rail-to-rail output swing | VOH ≥ 4.4 V and VOL ≤ 0.5 V at VCC = 5 V ensure full logic-level compatibility with downstream 5 V CMOS/TTL receivers. |
| Low quiescent current | ICC ≤ 40 µA over full temperature range minimizes standby power in battery-backed or energy-sensitive control modules. |
| Input transition rate tolerance | Δt/Δv ≤ 20 ns/V at VCC = 5 V prevents false triggering from slow-rising control signals like microcontroller reset lines. |
| Thermal performance | RθJA = 147.7°C/W (TSSOP) enables operation at full load in ambient temperatures up to 125°C with minimal derating. |
Applications
| Motor Drives and Controls | Programmable Logic Controllers |
|---|---|
Use Scenario: Isolating encoder feedback lines and PWM outputs between MCU and gate drivers in servo amplifier modules. IC Role / Device Role / Timing Role: Bidirectional bus buffer with per-channel OE control routes position data while preventing backfeed into sensitive analog sections. Use Value: Eliminates need for discrete MOSFET switches; 3-state outputs reduce EMI by decoupling inactive signal paths during commutation events. | Use Scenario: Expanding limited I/O count on PLC CPU modules to support additional field sensors and actuator interfaces. IC Role / Device Role / Timing Role: Logic-level translator and bus isolator that conditions 24 V sensor inputs down to 3.3 V MCU levels using external resistive dividers and internal buffering. Use Value: Enables hot-swap I/O module design-individual OE pins allow firmware-controlled reconfiguration without system reset or bus contention. |
| Power Over Ethernet (PoE) | Electronic Point-of-Sale |
Use Scenario: Managing communication between PoE controller IC and PD-side microcontroller in IEEE 802.3af/at powered devices. IC Role / Device Role / Timing Role: Signal direction manager for MDI/MDIX negotiation and classification signature exchange over shared PHY interface lines. Use Value: Prevents latch-up during power-up sequencing; high-impedance state ensures safe insertion/removal of PoE modules without disrupting upstream switch operation. | Use Scenario: Interfacing barcode scanner, receipt printer, and cash drawer signals to a single embedded ARM processor in compact retail terminals. IC Role / Device Role / Timing Role: Level-shifting and fan-out buffer that reconciles disparate logic families (e.g., 5 V scanner UART, 3.3 V SoC, 12 V solenoid drivers). Use Value: Reduces BOM count by replacing three discrete level translators; 14-pin TSSOP footprint fits tight PCB layouts typical in handheld POS hardware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC125APWR | Lower VCC range (1.65 V–5.5 V); higher speed (tPD ≤ 4.2 ns at 3.3 V); lower drive (±24 mA). | Better suited for 1.8 V/2.5 V FPGA interfaces; less robust for legacy 5 V industrial buses. | Select when interfacing with low-voltage FPGAs or ASICs requiring faster edge rates and tighter timing margins. |
| 74AHC125PW,118 | NXP variant; identical pinout and DC specs; minor differences in AC characteristics (tPD ≤ 7.5 ns at 5 V). | Approved for automotive AEC-Q100 Grade 2 (–40°C to 105°C); not rated for 125°C industrial operation. | Choose for automotive infotainment or body control modules where extended temperature qualification is unnecessary. |
Compared with SN74LVC125APWR and 74AHC125PW,118, SN74AHC125PWRE4 provides superior thermal margin for continuous 125°C operation, stronger 5 V drive capability, and TI's long-term industrial product lifecycle support-making it optimal for factory automation and infrastructure equipment.
Availability
SN74AHC125PWRE4 is available at Aetrix Electronics and suitable for motor drives and controls, programmable logic controllers, and Power over Ethernet (PoE) applications requiring stable component supply, long-lifecycle assurance, and industrial-grade reliability.
Supply support for SN74AHC125PWRE4 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 connectivity technologies with over 50 years of innovation in industrial and automotive electronics.
The SN74AHC125PWRE4 belongs to TI's AHC logic family, designed specifically for high-speed, low-power bus interface and signal routing in harsh industrial environments where voltage flexibility and thermal resilience are critical.
FAQ
What is the recommended power-up sequence for SN74AHC125PWRE4 to avoid undefined outputs?
TI specifies that OE pins must be held high (via pullup to VCC) during power-up to force all outputs into high-impedance state. For SN74AHC125PWRE4, use a minimum 10 kΩ pullup resistor from each OE pin to VCC. This prevents bus contention before the host MCU initializes its GPIOs and ensures deterministic startup behavior across –40°C to 125°C.
Can SN74AHC125PWRE4 interface directly between a 3.3 V microcontroller and a 5 V peripheral without level shifting?
Yes-SN74AHC125PWRE4 supports mixed-voltage operation: its inputs tolerate 0–5.5 V regardless of VCC setting, and outputs swing rail-to-rail. When VCC = 3.3 V, SN74AHC125PWRE4 outputs 0 V/3.3 V compatible with 3.3 V peripherals; when VCC = 5 V, outputs reach 0 V/5 V for 5 V loads. No external level shifter is needed if VCC matches the target bus voltage.
How does the individual OE architecture of SN74AHC125PWRE4 improve system reliability versus single-OE quad buffers?
SN74AHC125PWRE4's four independent OE pins allow granular control-e.g., disabling only the encoder feedback buffer during motor stall detection while keeping PWM and fault reporting active. This eliminates cross-talk, reduces ground bounce, and avoids simultaneous bus release transients that cause glitches in single-OE alternatives like SN74AHC244.
What thermal derating is required for SN74AHC125PWRE4 operating at 125°C ambient in a sealed enclosure?
With RθJA = 147.7°C/W (TSSOP), SN74AHC125PWRE4 dissipates ≤25 mW at full load (ICC ≈ 40 µA + IOL × VOL). At 125°C ambient, junction temperature remains below 150°C limit even with no airflow-no derating needed. However, TI recommends limiting continuous output current to ≤6 mA per channel above 85°C to maintain VOL < 0.55 V.
Is SN74AHC125PWRE4 RoHS-compliant and lead-free?
Yes-SN74AHC125PWRE4 is RoHS-compliant and features lead-free (Pb-free) terminations with NiPdAu plating. The "E4" suffix denotes TI's green packaging standard, and the device meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) for unlimited floor life at ≤30°C/60% RH.
SN74AHC125PWRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHC
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
SN74AHC125PWRE4 FAQ
1.How can I place an order for SN74AHC125PWRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC125PWRE4 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 SN74AHC125PWRE4 reliable?
The price and inventory of SN74AHC125PWRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC125PWRE4 is usually 5 days.
3.What payment methods are accepted for SN74AHC125PWRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHC125PWRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHC125PWRE4?
SN74AHC125PWRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC125PWRE4 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 SN74AHC125PWRE4?
For technical support, including SN74AHC125PWRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC125PWRE4 requirements.
6.How does Aetrix verify that SN74AHC125PWRE4 is sourced from the original manufacturer or authorized distributors?
All SN74AHC125PWRE4 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 SN74AHC125PWRE4 meets industry standards.
7.What is the process for return or replacement of SN74AHC125PWRE4?
All SN74AHC125PWRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC125PWRE4, 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 SN74AHC125PWRE4 part is unused and in its original packaging.
Return procedure for SN74AHC125PWRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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