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onsemi MC74LCX125D
- Part No.:
- MC74LCX125D
- Manufacturer:
- onsemi
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MC74LCX125D.pdf
- Description:
- IC BUF NON-INVERT 3.6V 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,595
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Product details
Overview
MC74LCX125D from onsemi is a low-voltage CMOS quad non-inverting 3-state buffer with 5 V-tolerant inputs and outputs, operating from 1.65 V to 5.5 V supply. It delivers 24 mA balanced output sink/source drive at 3.0 V, supports live insertion/withdrawal, and features IOFF protection for high-impedance state when VCC = 0 V. It is used in memory address driving and TTL-level bus transceiver applications.
For engineers reviewing the MC74LCX125D datasheet, pinout, applications, or equivalent options, key selection considerations include 5.5 V input tolerance, sub-10 ns propagation delay at 3.3 V, 14-pin TSSOP package, 10 µA quiescent ICC, and AEC-Q100 qualification for automotive use.
Technical Context
The MC74LCX125D implements four independent non-inverting buffers, each with dedicated 3-state output enable (OEn) control. Its TTL-compatible inputs reduce loading on upstream drivers, while its LVTTL/LVCMOS compatibility enables mixed-voltage system interfacing across 1.65–5.5 V domains.
Each buffer channel operates with rail-to-rail output swing, near-zero static current in all logic states (10 µA), and fast switching performance: tPLH/tPHL ≤ 6.0 ns at VCC = 3.3 V, with tPZH/tPZL ≤ 7.0 ns and tPHZ/tPLZ ≤ 6.0 ns under same conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.65 V to 5.5 V - Enables direct interface with 1.8 V, 2.5 V, 3.3 V, and 5 V logic families without level shifters. |
| Input Voltage Tolerance | −0.5 V to +6.5 V - Allows safe connection to 5 V TTL sources even when powered from 1.8 V or 2.5 V rails. |
| Output Drive Strength | ±24 mA @ 3.0 V - Sufficient to drive multiple TTL loads or moderate-capacitance buses without external buffering. |
| Propagation Delay | ≤6.0 ns @ VCC = 3.3 V - Supports high-speed data routing in memory and peripheral interfaces up to ~100 MHz. |
| Quiescent Supply Current | 10 µA max - Minimizes standby power in battery-operated or energy-sensitive embedded systems. |
| IOFF Leakage | 10 µA max @ VCC = 0 V - Ensures true isolation during hot-swap or power sequencing, preventing backfeeding. |
| ESD Rating | HBM >2000 V - Provides robust handling margin during PCB assembly and field service operations. |
Pinout & Package
TSSOP-14 (Case 948G), 4.4 mm × 5.0 mm body, 0.65 mm pitch, lead-free (G suffix), moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | OEn (Output Enable) | Active-HIGH control per buffer; asserts HIGH-Z output state when logic HIGH, enabling bus sharing. |
| 2, 5, 9, 12 | Dn (Data Input) | Non-inverting input for corresponding buffer; accepts 5 V-tolerant signals regardless of VCC voltage. |
| 3, 6, 8, 11 | On (Output) | 3-state buffered output; drives HIGH/LOW when OEn = LOW, enters high-impedance when OEn = HIGH. |
| 7 | GND | Ground reference for all logic and I/O circuits; must be connected to system ground plane. |
| 14 | VCC | Primary power supply pin; supplies internal logic and output drivers; decoupling capacitor required. |
Key Features
| Feature | Design Value |
|---|---|
| 5 V-tolerant I/O | Enables seamless interoperation between legacy 5 V TTL and modern low-voltage subsystems without external translators. |
| Live insertion support | IOFF and 5 V-tolerant inputs allow safe hot-plug operation in modular backplane or card-edge systems. |
| Balanced ±24 mA drive | Eliminates need for external pull-up/pull-down resistors in open-drain or bus-termination configurations. |
| Sub-10 µA quiescent ICC | Reduces system-level leakage current in always-on monitoring or sleep-mode subsystems. |
| AEC-Q100 qualified | Validated for automotive temperature range (−40 °C to +125 °C) and reliability requirements per MC74LCX125DTR2G-Q* variant. |
Applications
| Memory Address Buffering | Industrial Bus Transceiver |
|---|---|
Use Scenario: Driving address lines from a low-voltage microcontroller to a 5 V SRAM or flash memory device. IC Role / Device Role / Timing Role: Quad non-inverting buffer isolating and strengthening address signals while maintaining timing integrity. Use Value: Eliminates signal degradation over trace lengths >5 cm and prevents loading-induced timing skew across parallel address bits. | Use Scenario: Bidirectional data bus isolation between 3.3 V FPGA and 5 V industrial I/O module. IC Role / Device Role / Timing Role: 3-state buffer enabling controlled direction switching and voltage-domain bridging on shared data lines. Use Value: Prevents contention during bus arbitration and ensures reliable logic levels despite VCC mismatch between master and slave devices. |
| Automotive ECU Signal Conditioning | Hot-Swappable Module Interface |
Use Scenario: Level-shifting and buffering sensor interface signals in an AEC-Q100-compliant engine control unit. IC Role / Device Role / Timing Role: Signal integrity enhancer for analog-to-digital converter input conditioning and diagnostic line buffering. Use Value: Guarantees operation across −40 °C to +125 °C ambient and withstands load dump transients via robust 5 V-tolerant I/O structure. | Use Scenario: Enabling safe insertion/removal of daughter cards in telecom or test equipment backplanes. IC Role / Device Role / Timing Role: Isolation gate that prevents backpowering and signal corruption during mechanical mating/unmating. Use Value: IOFF protection ensures zero current flow when main board is powered but daughter card is unpowered, meeting IEC 61000-4-2 compliance requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC125APWR | Same 14-pin TSSOP package, 1.65–3.6 V only, no 5 V tolerance - requires external clamping for 5 V inputs. | Not suitable for direct 5 V TTL interfacing; limited to 3.3 V-only systems. | Select only if system operates strictly within 1.65–3.6 V and no 5 V signals are present. |
| 74ALVC125MTCX | Higher speed (tPD ≤ 3.3 ns @ 3.3 V), same 1.65–3.6 V range, no 5 V tolerance, different pinout (OE pins grouped). | Optimized for ultra-low latency in high-frequency clock/data paths, not mixed-voltage bus bridging. | Prefer when minimizing propagation delay is critical and voltage translation is handled elsewhere. |
Compared with SN74LVC125APWR and 74ALVC125MTCX, the MC74LCX125D uniquely supports 5 V-tolerant operation across its full 1.65–5.5 V supply range, making it the only option among the three qualified for direct interfacing between 5 V legacy peripherals and modern low-voltage controllers without additional circuitry.
Availability
MC74LCX125D is available at Aetrix Electronics and suitable for memory address buffering, industrial bus transceivers, automotive ECUs, and hot-swappable module interfaces requiring stable component supply and long-term lifecycle assurance.
Supply support for MC74LCX125D 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MC74LCX125D belongs to the LCX low-voltage CMOS logic family, designed specifically for mixed-voltage system interfacing, bus isolation, and low-power signal conditioning in space-constrained embedded platforms.
FAQ
What is the maximum supply voltage rating for MC74LCX125D?
The MC74LCX125D has an absolute maximum DC supply voltage (VCC) rating of +6.5 V. However, its recommended operating range is 1.65 V to 5.5 V. Operation above 5.5 V may compromise reliability and is not guaranteed by specification. The MC74LCX125D must never be operated continuously beyond 5.5 V in functional applications.
Does MC74LCX125D support hot-plug operation?
Yes, the MC74LCX125D supports live insertion and withdrawal due to its IOFF specification, which guarantees high-impedance I/O states when VCC = 0 V, and its 5 V-tolerant inputs. These features prevent back-driving and latch-up during partial power-up sequences, making the MC74LCX125D suitable for hot-swap backplane and modular system designs.
What is the propagation delay of MC74LCX125D at 3.3 V supply?
At VCC = 3.3 V and TA = −40 °C to +125 °C, the MC74LCX125D exhibits a maximum propagation delay (tPLH/tPHL) of 6.0 ns. This value is measured under standard AC test conditions with CL = 50 pF and RL = 500 Ω, confirming the MC74LCX125D's suitability for high-speed address and data bus applications up to approximately 100 MHz.
Is MC74LCX125D pin-compatible with standard 74HC125 devices?
No, the MC74LCX125D is not pin-compatible with standard 74HC125 devices. While both are quad 3-state non-inverting buffers in 14-pin packages, the MC74LCX125D uses a different pin assignment: OE0 is on pin 1 (not pin 1), D0 on pin 2 (not pin 2), O0 on pin 3 (not pin 3), and so on - matching the logic diagram and pinout shown in Figure 1 of the official MC74LCX125 datasheet. Always verify against the MC74LCX125D-specific pinout before PCB layout.
What does the "−Q" suffix mean in MC74LCX125DTR2G-Q*?
The "−Q" suffix in MC74LCX125DTR2G-Q* denotes automotive-grade qualification: the part is AEC-Q100 qualified, PPAP capable, and manufactured under enhanced process controls for automotive and other high-reliability applications requiring unique site and change management. The MC74LCX125DTR2G-Q* variant undergoes extended temperature screening (−40 °C to +125 °C) and rigorous reliability testing per AEC-Q100 Rev G standards.
MC74LCX125D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LCX
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- 24mA, 24mA
- Voltage - Supply:
- 2V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
MC74LCX125D FAQ
1.How can I place an order for MC74LCX125D through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74LCX125D 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 MC74LCX125D reliable?
The price and inventory of MC74LCX125D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74LCX125D is usually 5 days.
3.What payment methods are accepted for MC74LCX125D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74LCX125D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74LCX125D?
MC74LCX125D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74LCX125D 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 MC74LCX125D?
For technical support, including MC74LCX125D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74LCX125D requirements.
6.How does Aetrix verify that MC74LCX125D is sourced from the original manufacturer or authorized distributors?
All MC74LCX125D 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 MC74LCX125D meets industry standards.
7.What is the process for return or replacement of MC74LCX125D?
All MC74LCX125D units undergo pre-shipment inspection (PSI). If there is an issue with MC74LCX125D, 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 MC74LCX125D part is unused and in its original packaging.
Return procedure for MC74LCX125D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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