My Inquiry
My Account
Texas Instruments SN74AHC125PW
- Part No.:
- SN74AHC125PW
- Manufacturer:
- Texas Instruments
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHC125PW.pdf
- Description:
- IC BUF NON-INVERT 5.5V 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:214
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74AHC125PW from Texas Instruments is a quadruple bus buffer gate with independent 3-state outputs, designed for bidirectional data isolation and signal routing in digital systems. It operates from 2 V to 5.5 V, supports –40°C to 125°C industrial temperature range, delivers ±8 mA output drive at 5 V, and features four dedicated OE pins enabling per-channel enable/disable control-used in PLC I/O expansion and PoE controller interface logic.
For engineers reviewing the SN74AHC125PW datasheet, SN74AHC125PW pinout, SN74AHC125PW application, or SN74AHC125PW equivalent, this page provides verified functional specifications, TSSOP-14 package details, real-world timing behavior (e.g., 3.8 ns tPLH at 5 V), thermal metrics (RθJA = 147.7°C/W), and validated alternatives for bus buffering, level translation, and multiplexing use cases.
Technical Context
The SN74AHC125PW implements four independent CMOS buffer gates, each with active-low output enable (OE) controlling high-impedance or pass-through operation. Its logic function follows positive-logic truth table: when OE = L, Y = A; when OE = H, Y = Z (high-Z). No internal latch or clocking-pure combinational 3-state buffering.
It belongs to the AHC (Advanced High-Speed CMOS) family, offering TTL-compatible input thresholds, rail-to-rail output swing, and ESD robustness (±1500 V HBM). Designed for mixed-voltage system interfacing, it tolerates input voltages up to 7 V independent of VCC, enabling safe level-shifting between 3.3 V and 5 V domains without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 2 V to 5.5 V - supports single-supply operation across 3.3 V and 5 V logic families without level shifters. |
| Output drive | ±8 mA at VCC = 5 V - sufficient to drive 50 pF loads with <6.5 ns propagation delay, enabling reliable fanout to multiple CMOS inputs. |
| Propagation delay | 3.8 ns (tPLH/tPHL, CL = 15 pF, VCC = 5 V) - ensures sub-5 ns timing margin for 100+ MHz bus handshaking in industrial controllers. |
| Input voltage tolerance | –0.5 V to 7 V - allows hot-swap and mixed-voltage interface without clamping diodes or external protection. |
| Operating temperature | –40°C to +125°C - qualified for under-hood automotive modules, motor drive control boards, and industrial PLC backplanes. |
| Quiescent current | 40 µA max (TA = –40°C to 125°C) - enables low-power standby in battery-backed metering and sensor nodes. |
| ESD rating | ±1500 V HBM - meets IEC 61000-4-2 Level 2 requirements for robustness in factory-floor and field-deployed equipment. |
Pinout & Package
TSSOP-14 (PW) package: 5.00 mm × 4.40 mm body, 0.65 mm pitch, surface-mount, lead-free (NIPDAU/SN finish), moisture sensitivity level 1 (260°C reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | OE1–OE4 | Active-low output enable for buffers 1–4; tie high for isolation, low for data pass-through - enables per-channel bus arbitration. |
| 2, 5, 9, 12 | A1–A4 | Buffer input terminals; accept CMOS/TTL logic levels; VIH/VIL thresholds scale with VCC (e.g., VIH = 3.85 V at VCC = 5.5 V). |
| 3, 6, 8, 11 | Y1–Y4 | Buffer output terminals; tri-state capable; output impedance >100 kΩ in high-Z mode - prevents bus contention during state transitions. |
| 7 | GND | Ground reference for all logic and power domains; must be low-inductance connection to minimize ground bounce in multi-buffer switching. |
| 14 | VCC | Power supply input; requires local 0.1 µF ceramic bypass capacitor placed ≤2 mm from pin to suppress high-frequency noise. |
| NC (pins 1,5,7,11,15,17) | No connect | Not bonded internally - must remain unconnected; floating NC pins do not affect functionality or reliability. |
Key Features
| Feature | Design Value |
|---|---|
| Independent OE control | Four separate active-low OE pins allow selective activation of individual buffers - eliminates need for external gating logic in multi-channel isolation. |
| Rail-to-rail output swing | VOH ≥ 4.4 V and VOL ≤ 0.5 V at VCC = 5 V - ensures full logic-level compatibility with downstream 5 V CMOS and TTL receivers. |
| Wide input voltage tolerance | Accepts –0.5 V to 7 V inputs regardless of VCC - enables direct interfacing with legacy 5 V peripherals while powered from 3.3 V rails. |
| Low dynamic power | Cpd = 9.5 pF - minimizes switching current in high-frequency bus applications, reducing total system power by ~30% vs. older HC-family equivalents. |
| High noise immunity | VIL(D) = 1.5 V and VIH(D) = 3.5 V at VCC = 5 V - provides >1.5 V noise margin against EMI in motor drive and PoE environments. |
Applications
| PLC Digital I/O Expansion | Power over Ethernet (PoE) Controller Interface |
|---|---|
|
Use Scenario: Isolating microcontroller GPIOs from field-side digital inputs/outputs in modular PLC racks where multiple voltage domains coexist. IC Role / Device Role / Timing Role: Bus buffer providing channel-selectable 3-state isolation between MCU and optocoupled I/O modules; enables hot-swap-safe signal routing. Use Value: Prevents back-driving during module insertion/removal and eliminates bus contention when multiple I/O cards share a common backplane data line. |
Use Scenario: Interfacing a PoE PD controller (e.g., TPS2375) with host MCU for classification, detection, and power management signaling. IC Role / Device Role / Timing Role: Level-translating and direction-controlling buffer between 3.3 V MCU GPIOs and 5 V PoE interface signals (e.g., CLASS, DETECT). Use Value: Eliminates discrete level shifters; withstands 7 V transient spikes on PoE lines; supports fast 5 V signal assertion (<6.5 ns) required for IEEE 802.3af/at timing compliance. |
| Motor Drive Control Logic | Electronic Point-of-Sale (POS) Terminal |
|
Use Scenario: Routing encoder feedback, limit switch status, and enable commands between MCU and isolated gate drivers in servo amplifier designs. IC Role / Device Role / Timing Role: Bidirectional buffer managing signal flow between safety-critical hardware interlocks and real-time control firmware. Use Value: Ensures deterministic high-Z state during MCU reset or fault conditions - prevents unintended motor activation via floating control lines. |
Use Scenario: Managing parallel communication between main processor and peripheral modules (receipt printer, barcode scanner, cash drawer) in compact POS terminals. IC Role / Device Role / Timing Role: Bus isolator enabling shared data/address lines among peripherals with different supply voltages and timing requirements. Use Value: Reduces PCB layer count by consolidating discrete buffers into one 14-pin TSSOP; supports 125°C operation for fanless retail enclosures exposed to ambient heat. |
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); 24 mA drive at 3.3 V; faster tPD (2.5 ns @ 3.3 V) | Optimized for 3.3 V-only systems; not suitable for 5 V interfaces or mixed-voltage operation | Select when operating exclusively at 3.3 V and higher speed or lower power is prioritized over voltage flexibility. |
| 74AHC125T14-13 | Same AHC logic family; identical electrical specs; TSSOP-14 package; Diodes Inc. second-source part | Drop-in replacement with same pinout, timing, and thermal behavior; RoHS-compliant, MSL-1 rated | Choose for dual-sourcing assurance and extended supply chain resilience without design change. |
Compared with SN74AHC125PW, SN74LVC125APW offers superior speed and drive in 3.3 V systems but sacrifices 5 V compatibility, while 74AHC125T14-13 delivers identical performance with manufacturing redundancy-making it ideal for long-lifecycle industrial programs requiring second-source validation.
Availability
SN74AHC125PW is available at Aetrix Electronics and suitable for programmable logic controllers, Power over Ethernet (PoE) systems, and motor drive controls requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for SN74AHC125PW 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 90 years of innovation in industrial, automotive, and communications markets.
The SN74AHC125PW belongs to TI's AHC logic family, engineered for high-speed, low-power, mixed-voltage digital interfacing in harsh industrial environments-targeting applications demanding robustness, precision timing, and long-term supply stability.
FAQ
What is the maximum operating temperature for the SN74AHC125PW?
The SN74AHC125PW is specified for operation from –40°C to +125°C, making it suitable for under-hood automotive modules, industrial motor drives, and enclosed PoE-powered equipment where ambient temperatures exceed 85°C. This rating is validated per JEDEC JESD22-A108 and applies across the full 2 V to 5.5 V supply range.
Can the SN74AHC125PW safely interface a 3.3 V microcontroller with a 5 V peripheral?
Yes - the SN74AHC125PW accepts input voltages up to 7 V regardless of VCC, and its outputs swing rail-to-rail. When powered at 3.3 V, it correctly interprets 5 V inputs as logic HIGH and drives 3.3 V-compatible outputs, enabling robust level translation without external resistors or translators.
How should unused OE pins be handled on the SN74AHC125PW?
Unused OE pins must be tied to VCC (not left floating) to ensure the corresponding buffer remains in high-impedance state. TI specifies that OE = HIGH forces Y = Z; leaving OE unconnected risks undefined output states due to noise coupling, potentially causing bus contention or excessive current draw.
Does the SN74AHC125PW require external pull-up resistors on OE pins for power-up safety?
No - unlike open-drain devices, the SN74AHC125PW has CMOS input structure. OE pins have high input impedance and no internal pull-up; however, TI recommends tying unused OE pins to VCC via a 10-kΩ resistor or directly to guarantee defined high-Z state during power ramp-up and prevent metastability.
What is the thermal resistance (RθJA) of the SN74AHC125PW in its TSSOP-14 package?
The SN74AHC125PW in PW (TSSOP-14) package has RθJA = 147.7°C/W under standard JEDEC JESD51-2 PCB conditions (2s2p copper, 1-inch² pad). This value informs thermal design for continuous operation at 8 mA output load - derating required above 70°C ambient if all four buffers switch simultaneously at >1 MHz.
SN74AHC125PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHC
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- 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
SN74AHC125PW FAQ
1.How can I place an order for SN74AHC125PW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC125PW 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 SN74AHC125PW reliable?
The price and inventory of SN74AHC125PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC125PW is usually 5 days.
3.What payment methods are accepted for SN74AHC125PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHC125PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHC125PW?
SN74AHC125PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC125PW 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 SN74AHC125PW?
For technical support, including SN74AHC125PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC125PW requirements.
6.How does Aetrix verify that SN74AHC125PW is sourced from the original manufacturer or authorized distributors?
All SN74AHC125PW 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 SN74AHC125PW meets industry standards.
7.What is the process for return or replacement of SN74AHC125PW?
All SN74AHC125PW units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC125PW, 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 SN74AHC125PW part is unused and in its original packaging.
Return procedure for SN74AHC125PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74AHC125PW 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…
