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Texas Instruments SN74AHC125PWR
- Part No.:
- SN74AHC125PWR
- Manufacturer:
- Texas Instruments
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHC125PWR.pdf
- Description:
- IC BUF NON-INVERT 5.5V 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:20,322
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Product details
Overview
SN74AHC125PWR 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, supporting ±8 mA output drive at 5 V, 14-pin TSSOP package, and −40°C to +125°C temperature range - used for bidirectional data isolation in industrial PLC I/O modules.
For engineers reviewing the SN74AHC125PWR datasheet, SN74AHC125PWR pinout, SN74AHC125PWR application, or SN74AHC125PWR equivalent, key selection criteria include per-channel 3-state enable logic, rail-to-rail input compatibility, propagation delay under 6.5 ns (VCC = 5 V), low quiescent current (≤40 µA), and thermal performance in TSSOP-14 packaging.
Technical Context
The SN74AHC125PWR implements four independent CMOS buffer gates, each with dedicated active-low output-enable (OE) input controlling high-impedance or pass-through behavior. Its logic function follows positive-logic truth table: OE = L enables A→Y transmission; OE = H forces Y into high-Z state.
Designed for mixed-voltage system interfacing, it supports input voltages up to 7 V regardless of VCC, enabling safe level translation between 3.3 V and 5 V domains without external clamping. Power-up/down high-Z assurance requires OE tied to VCC via pullup resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 2 V to 5.5 V - enables interoperability across 2.5 V, 3.3 V, and 5 V logic systems without level shifters |
| Output drive | ±8 mA at VCC = 5 V - sufficient to drive standard TTL loads and moderate capacitive buses (≤50 pF) |
| Propagation delay | 3.8 ns (A→Y, CL = 15 pF, VCC = 5 V) - supports >100 MHz data rates in point-to-point routing |
| Input voltage range | −0.5 V to 7 V - allows overvoltage-tolerant inputs, simplifying interface with legacy 5 V peripherals on 3.3 V systems |
| Quiescent current | 40 µA max (TA = −40°C to +125°C) - ensures low static power in always-on industrial monitoring nodes |
| ESD rating | ±1500 V HBM - meets IEC 61000-4-2 Level 2 for board-level robustness in factory automation environments |
Pinout & Package
TSSOP-14 (PW) package: 5.00 mm × 4.40 mm body, 0.65 mm pitch, exposed pad optional, RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | OE1–OE4 | Active-low output-enable inputs - each controls one buffer independently; must be pulled high for power-up high-Z safety |
| 2, 5, 9, 12 | A1–A4 | Buffer input terminals - accept CMOS/TTL-compatible signals; tolerate −0.5 V to 7 V regardless of VCC |
| 3, 6, 8, 11 | Y1–Y4 | 3-state buffered outputs - present high-Z when corresponding OE is high; drive low or high when enabled |
| 7 | GND | Ground reference - return path for all I/O and supply currents; requires low-inductance connection to PCB ground plane |
| 14 | VCC | Power supply - bypassed with 0.1 µF ceramic capacitor placed within 3 mm of pin for noise suppression |
Key Features
| Feature | Design Value |
|---|---|
| Independent 3-state control | Four separate OE pins allow selective isolation of individual data lines - essential for dynamic bus arbitration in microcontroller GPIO expansion |
| Rail-to-rail input tolerance | Inputs operate safely from −0.5 V to 7 V independent of VCC - eliminates need for external clamps when interfacing 5 V sensors to 3.3 V MCUs |
| Low propagation skew | tsk(o) ≤ 1.5 ns (CL = 50 pF) - ensures synchronized enable/disable timing across channels for glitch-free bus handoff |
| High noise immunity | VIL(D) = 1.5 V / VIH(D) = 3.5 V at VCC = 5 V - provides ≥1.5 V noise margin against EMI in motor drive environments |
| Thermal efficiency | RθJA = 147.7°C/W (TSSOP) - enables operation at full drive strength in ambient up to +85°C without derating |
Applications
| PLC Digital I/O Expansion | Industrial PoE Data Isolation |
|---|---|
Use Scenario: Adding isolated digital input/output capability to compact programmable logic controller modules using limited MCU GPIO resources. IC Role / Device Role / Timing Role: SN74AHC125PWR acts as a configurable signal gate, enabling/disabling sensor/actuator lines under software control while maintaining high-Z during reconfiguration. Use Value: Reduces PCB footprint vs discrete buffers; eliminates cross-talk between unselected channels; supports hot-swap-safe I/O reassignment. | Use Scenario: Isolating MDI-side Ethernet PHY data lanes from PSE-side management logic in Power over Ethernet midspans. IC Role / Device Role / Timing Role: SN74AHC125PWR provides direction-controlled data buffering between 100BASE-TX pairs and microcontroller UART/SPI interfaces. Use Value: Prevents back-driving during power sequencing; enables shared MCU pins for diagnostics and data; withstands transient surges on PoE cabling. |
| Motor Drive Feedback Conditioning | Electronic Point-of-Sale Peripheral Interface |
Use Scenario: Conditioning encoder quadrature signals and limit switch inputs in servo amplifier boards subject to EMI from PWM switching. IC Role / Device Role / Timing Role: SN74AHC125PWR buffers and isolates low-voltage feedback signals before ADC sampling, with OE controlled by fault detection logic. Use Value: Rejects common-mode noise on long cables; prevents encoder glitches from propagating to control loop; enables fast fault-induced signal disable. | Use Scenario: Interfacing barcode scanners, receipt printers, and cash drawers to embedded POS controllers with constrained pin count. IC Role / Device Role / Timing Role: SN74AHC125PWR serves as a level-translating, direction-selectable bus repeater between 3.3 V SoC and mixed-voltage peripherals. Use Value: Eliminates need for discrete level shifters; supports hot-plug peripheral detection via OE-controlled presence sensing; reduces BOM cost by 30% vs dual-supply solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC125APW | Lower VCC range (1.65–3.6 V); higher speed (tPD = 2.5 ns @ 3.3 V); lower drive (±24 mA) | Optimized for 3.3 V-only systems; not suitable for 5 V interfaces or mixed-voltage translation | Select when operating exclusively at 3.3 V and requiring minimal propagation delay |
| 74AHC125PW,118 (Nexperia) | Identical logic function and pinout; same 2–5.5 V range; slightly higher ICC (≤100 µA) | Drop-in replacement with identical thermal metrics and layout compatibility | Choose for second-source assurance with validated qualification to JEDEC standards |
Compared with SN74LVC125APW, SN74AHC125PWR offers broader voltage flexibility and overvoltage-tolerant inputs; compared with 74AHC125PW,118, it delivers tighter production tolerances and TI's extended industrial temperature support (−40°C to +125°C).
Availability
SN74AHC125PWR is available at Aetrix Electronics and suitable for industrial PLCs, Power over Ethernet infrastructure, motor drive feedback conditioning, and electronic point-of-sale systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74AHC125PWR 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 industrial-grade product experience.
The SN74AHC125PWR belongs to TI's AHC logic family, designed specifically for robust, low-power, mixed-voltage digital interfacing in harsh industrial and automotive environments.
FAQ
What is the maximum recommended operating temperature for SN74AHC125PWR?
The SN74AHC125PWR is rated for continuous operation from −40°C to +125°C ambient temperature. This extended range is validated per TI's production test flow and supports deployment in sealed motor drive enclosures and outdoor PoE switches where internal temperatures exceed +85°C.
Does SN74AHC125PWR require external pull-up resistors on its OE pins?
Yes - to guarantee high-impedance state during power-up and power-down, each OE pin of the SN74AHC125PWR must be tied to VCC through an external pull-up resistor. The minimum value depends on the driver's sink capability; TI recommends 10 kΩ for most applications with standard CMOS drivers.
Can SN74AHC125PWR interface 3.3 V microcontrollers with 5 V peripherals?
Yes - the SN74AHC125PWR accepts input voltages up to 7 V independent of VCC, allowing direct connection of 5 V peripheral outputs to its A inputs when VCC = 3.3 V. Its outputs swing rail-to-rail, so Y outputs will be 0–3.3 V, requiring level translation only if the 5 V peripheral needs 5 V logic levels.
What is the typical propagation delay of SN74AHC125PWR at 3.3 V supply?
At VCC = 3.3 V ± 0.3 V and CL = 15 pF, the SN74AHC125PWR exhibits typical A→Y propagation delay of 5.6 ns (tPHL/tPLH) and OE→Y enable/disable delays of 5.4 ns (tPZL/tPZH) and 7.0 ns (tPLZ/tPHZ), measured at TA = 25°C per TI SCLS256O datasheet Section 5.6.
Is SN74AHC125PWR pin-compatible with other TSSOP-14 bus buffers?
SN74AHC125PWR shares identical pinout with industry-standard 74AHC125 devices in TSSOP-14 (PW) packaging, including Nexperia 74AHC125PW,118 and ON Semiconductor MC74VHC125DT. Pin functions match per TI's Table 4-1, confirming direct physical and logical compatibility across qualified second sources.
SN74AHC125PWR 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:
- 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:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
SN74AHC125PWR FAQ
1.How can I place an order for SN74AHC125PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC125PWR 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 SN74AHC125PWR reliable?
The price and inventory of SN74AHC125PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC125PWR is usually 5 days.
3.What payment methods are accepted for SN74AHC125PWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHC125PWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHC125PWR?
SN74AHC125PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC125PWR 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 SN74AHC125PWR?
For technical support, including SN74AHC125PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC125PWR requirements.
6.How does Aetrix verify that SN74AHC125PWR is sourced from the original manufacturer or authorized distributors?
All SN74AHC125PWR 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 SN74AHC125PWR meets industry standards.
7.What is the process for return or replacement of SN74AHC125PWR?
All SN74AHC125PWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC125PWR, 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 SN74AHC125PWR part is unused and in its original packaging.
Return procedure for SN74AHC125PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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