My Inquiry
My Account
Texas Instruments SN74LVC1G139DCTR
- Part No.:
- SN74LVC1G139DCTR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 8-LSSOP, 8-MSOP (0.110", 2.80mm Width)
- Datasheet:
-
SN74LVC1G139DCTR.pdf
- Description:
- IC DECODER/DEMUX 1 X 2:4 SM8
- Quantity:
- Payment:
- Shipping:
Inventory:26,470
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74LVC1G139DCTR from Texas Instruments is a 2-to-4 line decoder IC designed for high-speed memory decoding and data routing in 1.65-V to 5.5-V systems. It features active-low outputs (Y0–Y3), dual address inputs (A, B), 4.9 ns max propagation delay at 3.3 V/15 pF, ±24-mA output drive at 3.3 V, and Ioff support for live insertion and partial-power-down operation. It is used in SSDs and AV receivers for chip-select generation.
For engineers reviewing the SN74LVC1G139DCTR datasheet, SN74LVC1G139DCTR pinout, SN74LVC1G139DCTR application, or SN74LVC1G139DCTR equivalent, key selection criteria include its 8-pin SM8 package, 2-input/4-output active-low decode logic, overvoltage-tolerant inputs (up to 5.5 V), low ICC (10 µA max), and compatibility with mixed-voltage interface designs.
Technical Context
The SN74LVC1G139DCTR implements a standard binary 2-to-4 decoder with B as MSB and A as LSB; all four outputs are active-low and mutually exclusive under valid input conditions. Its CMOS design supports down-translation - inputs driven above VCC (up to 5.5 V) remain functional while VCC operates as low as 1.65 V.
It integrates Ioff circuitry that disables outputs during power-down, preventing back-drive current and enabling hot-plug capability. Propagation delays are tightly matched across outputs (tpd ≤ 4.9 ns at 3.3 V), and switching performance is characterized at CL = 15 pF with defined rise/fall rate limits (e.g., 15 ns/V at 3.3 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 5.5 V - enables interoperability across 1.8-V, 2.5-V, 3.3-V, and 5-V logic domains |
| Max tpd | 4.9 ns at 3.3 V / 15 pF - ensures negligible system delay in high-speed memory decode paths |
| Output Drive | ±24 mA at 3.3 V - supports fanout to multiple LVC/LVT inputs or light capacitive loads without buffers |
| Ioff Support | Yes - prevents damaging current flow when VCC = 0 V, enabling safe live insertion in backplane systems |
| Input Voltage Tolerance | Up to 5.5 V independent of VCC - allows interfacing with higher-voltage controllers without level shifters |
| ICC (max) | 10 µA - minimizes quiescent power in always-on subsystems such as standby decoders |
| ESD Rating | ±2500 V HBM - meets industrial handling requirements without additional protection circuitry |
Pinout & Package
The SN74LVC1G139DCTR is housed in an 8-pin SM8 (Small Outline Package) with nominal body size 2.95 mm × 2.80 mm and gull-wing leads. This NanoStar™ package uses the die as the package, minimizing footprint and thermal resistance (RθJA = 194°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A | Address input (bit 0) | LSB of 2-bit binary select; low or high determines Y0/Y1 vs Y2/Y3 activation |
| B | Address input (bit 1) | MSB of 2-bit binary select; combined with A selects exactly one active-low output |
| Y3 | Active-low decoded output | Asserted low only when A = H, B = H - used for CS3 in 4-chip-select decoding |
| GND | Ground reference | Return path for all internal logic and output currents; must be low-impedance |
| Y2 | Active-low decoded output | Asserted low only when A = L, B = H - used for CS2 in 4-chip-select decoding |
| Y1 | Active-low decoded output | Asserted low only when A = H, B = L - used for CS1 in 4-chip-select decoding |
| Y0 | Active-low decoded output | Asserted low only when A = L, B = L - used for CS0 in 4-chip-select decoding |
| VCC | Power supply | Supplies core logic and output drivers; requires local 0.1-µF bypass capacitor per TI layout guidance |
Key Features
| Feature | Design Value |
|---|---|
| NanoStar™ packaging | Die-as-package construction reduces PCB area by >50% vs standard SOIC-8 and improves thermal performance |
| Overvoltage-tolerant inputs | Accepts up to 5.5 V regardless of VCC setting - eliminates need for external level translators in mixed-supply systems |
| Ioff partial-power-down | Automatically disables outputs when VCC = 0 V - prevents back-current damage during hot-swap or power sequencing |
| Matched propagation delays | tpd variation < 1 ns across Y0–Y3 at 3.3 V - ensures glitch-free chip-select timing in synchronous memory interfaces |
| High noise immunity | VIL = 0.35×VCC (min) and VIH = 0.65×VCC (min) at 1.65 V - maintains reliable switching under noisy rail conditions |
Applications
| SSD Chip-Select Decoding | AV Receiver Memory Mapping |
|---|---|
Use Scenario: Generating four independent active-low chip-select signals for NAND flash dies in client SSD controllers. IC Role / Device Role / Timing Role: 2-bit address decoder mapping A[15:14] to Y0–Y3, enabling 16-KB address space partitioning per die. Use Value: Eliminates discrete gate logic; 4.9 ns tpd ensures no added latency beyond controller's address setup time. |
Use Scenario: Routing HDMI audio processor memory accesses across four SRAM banks in multi-zone AV receivers. IC Role / Device Role / Timing Role: Active-low decoder driving bank enable lines synchronized to system clock edges via clean, matched delays. Use Value: ±24-mA drive sustains signal integrity across 5-cm traces on dense audio PCBs without termination resistors. |
| TV Video Frame Buffer Selection | Industrial Tablet Display Controller |
Use Scenario: Selecting among four frame buffer RAMs in LCD TV timing controllers to support triple-buffering and overlay planes. IC Role / Device Role / Timing Role: Static decode element converting 2-bit video pipeline state into concurrent RAM bank enables. Use Value: Ioff support allows safe power gating of unused RAM banks while display engine remains active. |
Use Scenario: Enabling four parallel MIPI DSI lane groups in enterprise tablets using shared command/address bus architecture. IC Role / Device Role / Timing Role: Low-latency decoder asserting lane-group enables based on DSI packet header bits. Use Value: 1.65–5.5 V VCC range permits direct integration with 1.8-V display PHY supplies without LDO overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 2-to-4 decoder applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC1G139DCUR | VSSOP-8 package (2.30 mm × 2.00 mm); RθJA = 195°C/W; identical electrical specs | Smaller footprint but lower thermal mass; preferred for space-constrained layouts with moderate power dissipation | Select DCUR when board area is critical and thermal margin exceeds 25°C above ambient |
| 74LVC1G139GW,125 | DFN-6 (1.25 mm × 1.25 mm) from Nexperia; same VCC range and tpd; no Ioff support | Lacks Ioff - unsuitable for partial-power-down or hot-swap systems; requires external isolation for safe insertion | Choose GW,125 only for cost-sensitive, single-rail 3.3-V designs where live insertion is not required |
Compared with SN74LVC1G139DCUR and 74LVC1G139GW,125, the SN74LVC1G139DCTR offers the largest thermal pad area among SM8 variants and unique Ioff-enabled system-level power sequencing - making it the sole choice for industrial backplanes and modular SSD modules requiring hot-swap compliance.
Availability
SN74LVC1G139DCTR is available at Aetrix Electronics and suitable for SSD controller design, AV receiver memory routing, and LCD TV frame buffer selection requiring stable component supply across automotive-grade temperature ranges (–40°C to +85°C).
Supply support for SN74LVC1G139DCTR 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 logic solutions, with over 50 years of innovation in high-reliability interface and signal-path components.
The SN74LVC1G139 belongs to TI's LVC logic family - engineered for low-voltage, high-speed, mixed-supply interoperability in memory subsystems, consumer electronics, and industrial control interfaces.
FAQ
What is the maximum operating frequency supported by the SN74LVC1G139DCTR?
The SN74LVC1G139DCTR does not specify a maximum clock frequency because it is a combinational logic device without internal clocking. Its usable switching rate is determined by propagation delay (≤4.9 ns at 3.3 V) and load capacitance. For a 15-pF load, it reliably handles input transitions up to ~100 MHz in typical routing scenarios, as confirmed by TI's ICC vs. frequency characterization data.
Does the SN74LVC1G139DCTR support level shifting between different supply voltages?
Yes, the SN74LVC1G139DCTR supports true bidirectional level translation: inputs tolerate up to 5.5 V regardless of VCC (1.65–5.5 V), and outputs swing rail-to-rail between GND and the applied VCC. This allows it to interface a 5-V microcontroller address bus to a 1.8-V memory subsystem without external translators - a capability verified in TI's application note SCLA015.
Can unused inputs on the SN74LVC1G139DCTR be left floating?
No, unused inputs on the SN74LVC1G139DCTR must be tied to VCC or GND. Floating CMOS inputs cause undefined output states, increased ICC, and potential oscillation due to noise coupling. TI explicitly mandates biasing all unused inputs - for example, tying A and B to GND if only Y0 is used - as stated in Section 12.1 of the SCES602E datasheet.
What is the purpose of the Ioff feature in the SN74LVC1G139DCTR?
The Ioff feature in the SN74LVC1G139DCTR disables all outputs when VCC = 0 V, blocking current flow from powered I/O lines into the unpowered device. This protects against back-drive damage during hot-swap events or partial power-down modes - a requirement validated per JESD78 Class II latch-up testing and confirmed in TI's functional mode table (Section 9.4).
Is the SN74LVC1G139DCTR pin-compatible with other packages in the same family?
No - the SN74LVC1G139DCTR (SM8) has a different pinout and land pattern than the DCU (VSSOP) and YZP (DSBGA) variants. While all share identical logic functionality and signal names, mechanical dimensions, lead pitch, and terminal locations differ. The DCT package places VCC at pin 8 and GND at pin 4; DCU swaps these positions, and YZP uses bottom-side ball mapping - requiring separate PCB footprints.
SN74LVC1G139DCTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 8-LSSOP, 8-MSOP (0.110", 2.80mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Decoder/Demultiplexer
- Circuit:
- 1 x 2:4
- Independent Circuits:
- 1
- Current - Output High, Low:
- 32mA, 32mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 1.65V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SM8
SN74LVC1G139DCTR FAQ
1.How can I place an order for SN74LVC1G139DCTR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC1G139DCTR 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 SN74LVC1G139DCTR reliable?
The price and inventory of SN74LVC1G139DCTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC1G139DCTR is usually 5 days.
3.What payment methods are accepted for SN74LVC1G139DCTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC1G139DCTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC1G139DCTR?
SN74LVC1G139DCTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC1G139DCTR 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 SN74LVC1G139DCTR?
For technical support, including SN74LVC1G139DCTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC1G139DCTR requirements.
6.How does Aetrix verify that SN74LVC1G139DCTR is sourced from the original manufacturer or authorized distributors?
All SN74LVC1G139DCTR 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 SN74LVC1G139DCTR meets industry standards.
7.What is the process for return or replacement of SN74LVC1G139DCTR?
All SN74LVC1G139DCTR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC1G139DCTR, 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 SN74LVC1G139DCTR part is unused and in its original packaging.
Return procedure for SN74LVC1G139DCTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74LVC1G139DCTR Tags
-
SN74HC138DR
Texas Instruments
-
TC7SB3157CFU,LF(CT
Toshiba Semiconductor and Storage
-
74CBTLV3257PW,118
Nexperia USA Inc.
-
SN74CBTLV3257PWR
Texas Instruments
-
74CBTLV3257GUX
Nexperia USA Inc.
-
74HC154BQ,118
Nexperia USA Inc.
-
P3S0200GMX
NXP USA Inc.
-
SN74CB3Q3245PWR
Texas Instruments
-
SN74CB3Q3257RGYR
Texas Instruments
-
TCA9543APWR
Texas Instruments
-
TCA9546APWR
Texas Instruments
-
SN74HC138N
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…
