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Texas Instruments SN74AHC125DBR
- Part No.:
- SN74AHC125DBR
- Manufacturer:
- Texas Instruments
- Package:
- 14-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74AHC125DBR.pdf
- Description:
- IC BUF NON-INVERT 5.5V 14SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,848
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Product details
Overview
SN74AHC125DBR from Texas Instruments is a quadruple 3-state bus buffer gate IC with independent output-enable (OE) control per channel, operating across 2 V to 5.5 V supply range, supporting ±8 mA output drive at 5 V, and rated for –40°C to +125°C industrial temperature operation. It enables bidirectional signal isolation in multi-function GPIO routing for programmable logic controllers and motor control interfaces.
For engineers reviewing the SN74AHC125DBR datasheet, SN74AHC125DBR pinout, SN74AHC125DBR application, or SN74AHC125DBR equivalent, key selection criteria include per-channel 3-state enable timing (tPLZ/tPHZ ≤ 11.5 ns @ 5 V), low ICC (≤40 µA max), high noise immunity (VIH/VIL thresholds scaling with VCC), and SSOP-14 package compatibility with space-constrained industrial PCB layouts.
Technical Context
The SN74AHC125DBR implements four independent CMOS buffer gates, each with dedicated OE input controlling high-impedance (Z) or pass-through (A→Y) output states. Its AHC logic family delivers rail-to-rail output swing, fast propagation (tPHL/tPLH ≤ 6.5 ns @ 5 V, CL = 15 pF), and robust ESD protection (±1500 V HBM).
Each buffer operates with true 3-state logic: OE = LOW enables data flow (A → Y); OE = HIGH forces Y into high-impedance mode. Power-up/down isolation requires OE tied to VCC via pullup resistor to prevent bus contention during supply transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 5.5 V - supports mixed-voltage system interfacing (e.g., 3.3 V MCU to 5 V peripheral bus) |
| Output Drive Strength | ±8 mA @ VCC = 5 V - sufficient to drive standard TTL loads and moderate-capacitance traces without external buffering |
| Propagation Delay | ≤6.5 ns @ VCC = 5 V, CL = 15 pF - enables reliable operation in sub-100 MHz digital control paths |
| 3-State Enable/Disable Time | tPLZ/tPHZ ≤ 11.5 ns @ VCC = 5 V - ensures clean bus arbitration with minimal glitch window during state transitions |
| Input Thresholds | VIH = 3.85 V, VIL = 1.65 V @ VCC = 5.5 V - provides ≥0.7 V noise margin under worst-case supply and temperature |
| Quiescent Current | ICC ≤ 40 µA @ –40°C to +125°C - suitable for always-on industrial monitoring nodes with low standby power budgets |
| ESD Rating | ±1500 V HBM - meets IEC 61000-4-2 Level 2 requirements for board-level ESD robustness |
Pinout & Package
SN74AHC125DBR uses a 14-pin SSOP (Shrink Small Outline Package) with 0.65 mm lead pitch and 6.20 mm × 5.30 mm body size. Pin numbering follows standard SOIC/SSOP top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | OE1–OE4 | Independent 3-state enable inputs - LOW enables corresponding A→Y path; HIGH forces Y to high-Z |
| 2, 5, 9, 12 | A1–A4 | Buffer input terminals - accept CMOS/TTL-compatible logic levels referenced to device VCC |
| 3, 6, 8, 11 | Y1–Y4 | Buffer output terminals - provide rail-to-rail CMOS outputs with ±8 mA sink/source capability |
| 7 | GND | Ground reference - must be connected to system ground plane with low-inductance path for noise control |
| 14 | VCC | Power supply - requires local 0.1 µF ceramic bypass capacitor placed within 2 mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| Four independent 3-state buffers | Enables selective routing of up to four parallel data lines without shared enable constraints |
| Wide VCC range (2 V to 5.5 V) | Eliminates level-shifting components when interfacing 1.8 V, 3.3 V, and 5 V subsystems |
| Low dynamic power consumption | Cpd = 9.5 pF - minimizes switching current in high-frequency control loops (e.g., PWM gate drivers) |
| High noise immunity | VIH/VIL thresholds scale with VCC - maintains consistent logic margins across supply voltage variations |
| Industrial temperature range | –40°C to +125°C operation - validated for use in motor drives, PoE injectors, and factory automation hardware |
Applications
| Programmable Logic Controllers | Motor Drives and Controls |
|---|---|
Use Scenario: Isolating configuration signals between CPU module and I/O expansion backplane during hot-swap events. IC Role / Device Role / Timing Role: Bus buffer providing controlled 3-state enable per I/O channel to prevent backfeeding and bus contention. Use Value: Prevents data corruption during module insertion/removal by ensuring only one active driver per bus segment at any time. | Use Scenario: Routing direction and enable signals from microcontroller to dual H-bridge gate drivers in servo amplifier design. IC Role / Device Role / Timing Role: Signal conditioner translating MCU GPIO logic to isolated gate-drive control lines with precise timing alignment. Use Value: Enables synchronized activation of complementary FET pairs while blocking cross-conduction paths during dead-time transitions. |
| Power Over Ethernet (PoE) | Electronic Point-of-Sale |
Use Scenario: Managing communication between PoE controller IC and PD interface ASIC across isolated power domains. IC Role / Device Role / Timing Role: Level-translating buffer isolating management data lines during power negotiation and classification phases. Use Value: Maintains signal integrity during 48 V DC startup transients and supports IEEE 802.3af/at compliance testing sequences. | Use Scenario: Multiplexing keypad scan lines and display backlight control signals in compact retail terminal PCB layout. IC Role / Device Role / Timing Role: GPIO expander substitute reducing BOM count by consolidating four independent control paths into single SSOP-14 footprint. Use Value: Saves 12 mm² board area versus discrete buffer solutions while maintaining full functional testability per channel. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AHCT125DBR | TTL-compatible input thresholds (VIH = 2 V min @ VCC = 4.5 V); otherwise identical pinout and timing | Better suited for legacy 5 V TTL systems where AHC's higher VIH may cause marginal recognition of weak HIGH signals | Select SN74AHCT125DBR when interfacing with older 5 V logic families lacking strong drive strength |
| SN74LVC125ADBR | Lower VCC range (1.65 V to 3.6 V); 24 mA output drive; smaller 1.2 mm × 3 mm X2SON package option available | Optimized for battery-powered handheld POS devices requiring ultra-low voltage operation and minimal PCB footprint | Choose SN74LVC125ADBR for 3.3 V-only designs prioritizing power efficiency and miniaturization over wide-supply flexibility |
Compared with SN74AHCT125DBR and SN74LVC125ADBR, the SN74AHC125DBR uniquely balances broad supply adaptability (2–5.5 V), industrial temperature resilience, and SSOP-14 manufacturability-making it the preferred choice for ruggedized embedded control where voltage domain bridging and thermal reliability are critical.
Availability
SN74AHC125DBR is available at Aetrix Electronics and suitable for programmable logic controllers, motor drives and controls, Power Over Ethernet (PoE) systems, and electronic point-of-sale terminals requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74AHC125DBR 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 delivering analog, embedded processing, and connectivity technologies for industrial, automotive, and communications markets.
The SN74AHC125DBR belongs to TI's AHC logic family, engineered for high-speed, low-power bus interfacing in industrial control and automation systems where reliable 3-state isolation and wide supply tolerance are essential.
FAQ
What is the maximum operating temperature for the SN74AHC125DBR?
The SN74AHC125DBR is rated for continuous operation from –40°C to +125°C ambient temperature, making it suitable for deployment in enclosed motor drive enclosures and industrial PLC cabinets where thermal management is constrained. This rating is verified per JEDEC JESD22-A108 and applies to the SSOP-14 package variant specified in the SN74AHC125DBR orderable part number.
Does the SN74AHC125DBR require external pull-up resistors on its OE pins?
Yes - to ensure high-impedance state during power-up or power-down, each OE pin of the SN74AHC125DBR must be tied to VCC through an external pull-up resistor. The minimum resistance value depends on the current-sinking capability of the driving source; typical values range from 4.7 kΩ to 10 kΩ for standard GPIO control. This prevents undefined output states that could cause bus contention.
Can the SN74AHC125DBR interface directly between 3.3 V and 5 V logic domains?
Yes - the SN74AHC125DBR supports VCC = 3.3 V or 5 V operation, and its inputs tolerate voltages up to 7 V regardless of supply level. When powered at 3.3 V, it correctly interprets 5 V inputs as valid HIGH signals due to its overvoltage-tolerant input structure. However, outputs swing only to the selected VCC level, so external level-shifting may be needed for 5 V-referenced receivers.
What is the recommended bypass capacitor for the SN74AHC125DBR VCC pin?
A 0.1 µF ceramic capacitor placed within 2 mm of the VCC pin (Pin 14) is the minimum recommended bypass solution for the SN74AHC125DBR. For systems with high-frequency switching noise or multiple logic devices sharing the same rail, paralleling a 1 µF capacitor improves low-frequency decoupling. All capacitors must connect directly to the local ground plane with short, wide traces to minimize inductance.
Is the SN74AHC125DBR pin-compatible with other SN74AHC125 package variants?
Yes - the SN74AHC125DBR shares identical pin functions and numbering with all 14-pin packages listed in the SN74AHC125 family (SOIC-D, TSSOP-PW, TVSOP-DGV, PDIP-N), including matching GND (Pin 7), VCC (Pin 14), and OE/A/Y assignments. Mechanical dimensions differ, but PCB footprint design can accommodate multiple variants using a common land pattern with appropriate solder mask and paste definitions.
SN74AHC125DBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHC
- Package/Case:
- 14-SSOP (0.209", 5.30mm 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-SSOP
SN74AHC125DBR FAQ
1.How can I place an order for SN74AHC125DBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC125DBR 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 SN74AHC125DBR reliable?
The price and inventory of SN74AHC125DBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC125DBR is usually 5 days.
3.What payment methods are accepted for SN74AHC125DBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHC125DBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHC125DBR?
SN74AHC125DBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC125DBR 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 SN74AHC125DBR?
For technical support, including SN74AHC125DBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC125DBR requirements.
6.How does Aetrix verify that SN74AHC125DBR is sourced from the original manufacturer or authorized distributors?
All SN74AHC125DBR 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 SN74AHC125DBR meets industry standards.
7.What is the process for return or replacement of SN74AHC125DBR?
All SN74AHC125DBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC125DBR, 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 SN74AHC125DBR part is unused and in its original packaging.
Return procedure for SN74AHC125DBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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