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STMicroelectronics 74LVX238MTR
- Part No.:
- 74LVX238MTR
- Manufacturer:
- STMicroelectronics
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
74LVX238MTR.pdf
- Description:
- IC DECODER/DEMUX 1 X 3:8 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,739
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Product details
Overview
74LVX238MTR from STMicroelectronics is a low-voltage CMOS 3-to-8 line decoder with 5V-tolerant inputs, operating from 2V to 3.6V supply. It features 5.5ns typical propagation delay at 3.3V, ±4mA symmetrical output drive, and pin/function compatibility with 74-series 138 decoders. Used in memory address decoding and low-noise 3.3V system interfacing.
For engineers reviewing the 74LVX238MTR datasheet, 74LVX238MTR pinout, 74LVX238MTR application, or 74LVX238MTR equivalent, key selection criteria include 5V-tolerant input handling, balanced tPLH/tPHL delays, power-down input protection, and cascade-enabled triple-enable architecture for hierarchical decoding.
Technical Context
The device implements active-low enable logic with three independent enables (G1, G2A, G2B) enabling flexible cascading in multi-level address decoders. All inputs accept 0–7V regardless of VCC, supporting robust 5V-to-3.3V level translation without external components.
Its sub-micron C2MOS process delivers true CMOS quiescent current (2µA max), low dynamic noise (VOLP = 0.3V typ.), and latch-up immunity. Outputs are non-inverting, with guaranteed VOH ≥2.58V and VOL ≤0.44V at 4mA load over full temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 3.6V - supports battery-powered and mixed-voltage 3.3V systems with 1.2V data retention |
| tPD (Typ.) | 5.5ns at VCC = 3.3V, CL = 15pF - enables high-speed address decoding in fast memory subsystems |
| Input Tolerance | 0V to 5.5V - allows direct connection to 5V logic without level shifters |
| IOL / IOH | ±4mA min - drives standard TTL loads and multiple CMOS inputs reliably |
| ICC (Max) | 2µA at TA = 25°C - ensures ultra-low standby power in portable applications |
| VOLP (Typ.) | 0.3V at VCC = 3.3V - minimizes switching noise coupling into sensitive analog sections |
| ESD Rating | 2kV HBM - protects against handling damage during board assembly and test |
Pinout & Package
SOP-16 package (SO-16, 150 mil width), compliant with JEDEC MS-012, with gull-wing leads and 1.27mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 (A, B, C) | Binary Address Inputs | Select one of eight outputs (Y0–Y7); active-high, decoded per truth table |
| 4, 5 (G2A, G2B) | Active-High Enable Inputs | Both must be low to activate decode; used for hierarchical enable chaining |
| 6 (G1) | Active-Low Enable Input | Must be high to enable function; complements G2A/G2B for flexible gating |
| 7–9, 11–14 (Y0–Y7) | Active-High Decoder Outputs | Only one asserted per valid input combination; all low when disabled |
| 8 (GND) | Ground Reference | 0V return path for all internal logic and I/O; requires low-impedance PCB plane |
| 16 (VCC) | Positive Supply | 2–3.6V CMOS core supply; bypassing with 100nF ceramic near pin is mandatory |
Key Features
| Feature | Design Value |
|---|---|
| 5V-tolerant inputs | Accepts 0–5.5V signals independent of VCC - eliminates external level translators in mixed-voltage designs |
| Power-down input protection | Inputs tolerate 0–7V with VCC = 0V - prevents back-powering and latch-up during hot-insertion or power sequencing |
| Symmetrical output drive | |IOH| = IOL ≥ 4mA - ensures matched rise/fall times and predictable timing margins |
| Balanced propagation delays | tPLH ≅ tPHL - simplifies timing analysis in synchronous address decode paths |
| Triple enable architecture | G1 (active-low), G2A/G2B (active-high) - enables compact 2-chip 4-to-16 or 3-chip 5-to-32 expansion |
Applications
| Memory Address Decoding | Industrial PLC I/O Expansion |
|---|---|
Use Scenario: Selecting one of eight memory banks or peripheral devices in a microcontroller-based embedded system. IC Role / Device Role / Timing Role: 3-bit address decoder providing chip-select signals with deterministic 5.5ns delay and 5V-tolerant address bus interface. Use Value: Enables direct connection to legacy 5V address lines while operating from 3.3V supply, reducing BOM count and layout complexity. | Use Scenario: Expanding discrete I/O points via modular backplane with mixed-voltage sensor/actuator interfaces. IC Role / Device Role / Timing Role: Hierarchical enable distributor routing control signals to eight isolated I/O modules using G1/G2A/G2B cascade logic. Use Value: Guarantees <13.5ns worst-case enable-to-output delay across -55°C to +125°C, ensuring deterministic scan cycle timing. |
| Low-Power Portable Instrumentation | Automotive Body Control Module |
Use Scenario: Power-gating unused subsystems (e.g., display backlight, sensor arrays) in handheld test equipment. IC Role / Device Role / Timing Role: Low-quiescent-current (2µA) decoder enabling/disabling power switches based on mode selection inputs. Use Value: Extends battery life by eliminating leakage through unselected paths while maintaining fast wake-up response. | Use Scenario: Routing CAN/LIN transceiver enable signals and diagnostic LED drivers in a centralized body controller. IC Role / Device Role / Timing Role: Noise-immune (VOLP = 0.3V) decoder driving multiple 4mA loads with ESD-hardened inputs for under-hood reliability. Use Value: Meets ISO 10605 25kV air-gap ESD requirements without additional protection circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3-to-8 decoder applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LV138APWR | Lower ICC (1µA max), but only 3.3V-tolerant inputs (not 5V-tolerant); tPD = 6.1ns typ. | Requires external level shifting for 5V address buses; better suited for pure 3.3V systems. | Choose when system uses exclusively 3.3V logic and ultra-low standby current is critical. |
| 74LVC138AD,118 | Wider VCC range (1.2–3.6V), higher speed (tPD = 4.4ns), but no 5V-tolerant inputs and lower ESD rating (1kV). | Not suitable for 5V-to-3.3V interfacing; requires tighter supply regulation below 1.65V. | Prefer for high-speed, single-supply 3.3V designs where input voltage margin is not required. |
Compared with SN74LV138APWR and 74LVC138AD,118, the 74LVX238MTR uniquely combines 5V input tolerance, 2µA ICC, and industrial temperature support - making it optimal for legacy-compatible, low-power, mixed-voltage decoding where robustness outweighs marginal speed gains.
Availability
74LVX238MTR is available at Aetrix Electronics and suitable for memory address decoding, industrial I/O expansion, low-power portable instrumentation, and automotive body control modules requiring stable component supply and long-term lifecycle assurance.
Supply support for 74LVX238MTR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.
The LVX logic family targets low-voltage, low-power, 5V-tolerant interface applications - specifically engineered for seamless integration between legacy 5V systems and modern 3.3V embedded platforms.
FAQ
Can 74LVX238MTR operate with VCC = 1.8V?
No. The recommended operating VCC range is 2.0V to 3.6V. At 1.8V, DC parameters such as VIH (min 1.5V at VCC = 2.0V) and VOH (guaranteed only down to 2.0V) are not specified or guaranteed. Operation below 2.0V may result in undefined logic states and increased ICC.
What is the maximum capacitive load this decoder can drive reliably?
The device is characterized up to 50pF load (per AC specs), with tPD increasing from 5.5ns (15pF) to 8.0ns (50pF) at VCC = 3.3V. Driving >50pF risks violating setup/hold timing in downstream logic and increases VOLP-induced noise; use a buffer for heavier loads.
How does the triple-enable architecture simplify cascading?
G1 (active-low) and G2A/G2B (active-high) allow two-stage enable control: e.g., G2A/G2B from upper address bits select a decoder group, while G1 from a global signal enables only one device per group - reducing fanout and enabling clean 4-to-16 decoding with two chips.
Is thermal derating required above 85°C ambient?
Yes. While rated for -55°C to +125°C operation, ICC increases with temperature (max 20µA at +125°C). For sustained operation >85°C, ensure PCB copper area and airflow maintain junction temperature ≤150°C per absolute max ratings, especially under 4mA output loading.
74LVX238MTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74LVX
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Decoder/Demultiplexer
- Circuit:
- 1 x 3:8
- Independent Circuits:
- 1
- Current - Output High, Low:
- 4mA, 4mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 2V ~ 3.6V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
74LVX238MTR FAQ
1.How can I place an order for 74LVX238MTR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVX238MTR 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 74LVX238MTR reliable?
The price and inventory of 74LVX238MTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVX238MTR is usually 5 days.
3.What payment methods are accepted for 74LVX238MTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVX238MTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LVX238MTR?
74LVX238MTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVX238MTR 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 74LVX238MTR?
For technical support, including 74LVX238MTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVX238MTR requirements.
6.How does Aetrix verify that 74LVX238MTR is sourced from the original manufacturer or authorized distributors?
All 74LVX238MTR 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 74LVX238MTR meets industry standards.
7.What is the process for return or replacement of 74LVX238MTR?
All 74LVX238MTR units undergo pre-shipment inspection (PSI). If there is an issue with 74LVX238MTR, 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 74LVX238MTR part is unused and in its original packaging.
Return procedure for 74LVX238MTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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