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onsemi SN74LS08MEL
- Part No.:
- SN74LS08MEL
- Manufacturer:
- onsemi
- Category:
- Gates and Inverters
- Package:
- -
- Datasheet:
-
SN74LS08MEL.pdf
- Description:
- IC GATE AND 2-INP
- Quantity:
- Payment:
- Shipping:
Inventory:4,000
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Product details
Overview
SN74LS08MEL from ON Semiconductor is a quad 2-input AND gate in the LS (Low-Power Schottky) TTL logic family, performing basic Boolean conjunction with guaranteed 4.75–5.25 V supply operation, 0–70 °C ambient range, and 8 mA output sink capability. It serves as a fundamental combinational logic building block in digital control, address decoding, and enable gating circuits.
For engineers reviewing the SN74LS08MEL datasheet, pinout, applications, or equivalent options, key selection considerations include its SOEIAJ-14 package footprint, guaranteed DC switching thresholds (VIH = 2.0 V, VIL = 0.8 V), propagation delays (tPLH/tPHL ≤ 15/20 ns), and compatibility with legacy 5 V TTL systems.
Technical Context
The SN74LS08MEL implements four independent AND gates using bipolar transistor–transistor logic with Schottky-clamped outputs to reduce saturation delay. Each gate features standard TTL input thresholds and drives loads up to 8 mA low while sourcing −0.4 mA high under worst-case conditions.
Its AC performance is characterized at TA = 25 °C with CL = 15 pF, delivering tPLH ≤ 15 ns and tPHL ≤ 20 ns. The device operates strictly within the commercial temperature range (0–70 °C) and requires no external biasing or pull-up resistors for standard interfacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply Voltage | 4.75–5.25 V - Ensures stable operation across standard 5 V ±5% rail tolerances. |
| Operating Temperature | 0–70 °C - Validated for commercial-grade embedded and industrial control environments. |
| IOL Output Sink | 8.0 mA - Drives standard TTL inputs and small LED indicators directly without buffering. |
| VIH / VIL Thresholds | 2.0 V / 0.8 V - Guarantees noise-immune logic level recognition in mixed-signal boards. |
| tPLH / tPHL Delay | ≤15 ns / ≤20 ns - Supports reliable timing in sub-30 MHz synchronous logic paths. |
| ICC Supply Current | 4.8–8.8 mA - Total quiescent current scales with number of active outputs (high/low state). |
Pinout & Package
SN74LS08MEL uses the SOEIAJ-14 surface-mount package (Case 965), a 300-mil wide, gull-wing leaded plastic body with 14 terminals. Pin spacing is 1.27 mm (0.050 inch), and lead finish is matte tin.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 5, 9, 10, 12, 13 | Input A/B per gate | Eight total inputs - two per AND gate (Gates 1–4); TTL-compatible voltage thresholds. |
| 3, 6, 8, 11 | Output Y per gate | Four independent open-collector–like outputs with Schottky-clamped totem-pole structure. |
| 7 | GND | Ground reference for all internal circuitry and output stage return path. |
| 14 | VCC | Positive supply terminal - must be decoupled locally with 0.1 μF ceramic capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Quad 2-input AND function | Four fully isolated logic gates in one 14-pin package - reduces board space vs discrete gate ICs. |
| Low-power Schottky (LS) process | Combines speed of Schottky clamping with ~1/3 power consumption of standard TTL (74xx). |
| Guaranteed DC specs over temp | All VIH, VIL, VOH, VOL, IOL, IOH limits validated across 0–70 °C - no derating needed. |
| TTL-compatible interface | Direct drop-in replacement for 74xx AND gates without level-shifting or redesign. |
Applications
| Industrial Control Logic | Legacy System Repair |
|---|---|
Use Scenario: Enabling motor start signals only when both safety interlock and run command are asserted. IC Role / Device Role / Timing Role: Combinational logic gate performing real-time hardware-level AND decision before enabling power stage. Use Value: Eliminates software polling latency and provides fail-safe hardware gating with deterministic 20 ns max response. | Use Scenario: Replacing obsolete 7408 variants on decades-old test equipment PCBs. IC Role / Device Role / Timing Role: Pin- and function-identical drop-in logic replacement preserving original timing and drive strength. Use Value: Restores full functionality without layout modification or signal integrity revalidation. |
| Address Decoding | Digital Instrumentation |
Use Scenario: Selecting peripheral chips by AND-ing chip-select and address-line signals in microcontroller-based data loggers. IC Role / Device Role / Timing Role: Active-low address decoder element generating chip-enable strobes synchronized to bus cycles. Use Value: Provides clean, glitch-free enable pulses with <20 ns propagation delay matching 8-bit MCU bus timing. | Use Scenario: Gating display segment drivers based on mode and data-ready flags in handheld multimeters. IC Role / Device Role / Timing Role: Synchronous logic enabler controlling digit multiplexing and ADC readout sequencing. Use Value: Ensures precise timing alignment between measurement sampling and visual feedback with TTL-level compatibility. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad 2-input AND gate applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS08N | Dual-in-line package (14-pin PDIP); identical electrical specs and logic function. | Suitable for through-hole prototyping or legacy repair where SOEIAJ footprint is unavailable. | Select when manual soldering, breadboarding, or socket-based field replacement is required. |
| SN74LS08D | SOIC-14 package (Case 751A); same pinout and DC/AC specs as SN74LS08MEL but different leadform geometry. | Compatible with standard SOIC reflow profiles; not interchangeable mechanically with SOEIAJ due to lead pitch and contour. | Choose for automated SMT assembly lines using JEDEC-standard SOIC carriers and pick-and-place feeders. |
Compared with SN74LS08N and SN74LS08D, the SN74LS08MEL offers identical logic behavior and electrical performance but is optimized for EIAJ-standard SOEIAJ-14 mounting-critical for Japanese-origin equipment and certain aerospace avionics modules requiring that specific footprint and thermal profile.
Availability
SN74LS08MEL is available at Aetrix Electronics and suitable for industrial control logic, legacy system repair, address decoding, and digital instrumentation requiring stable component supply and long-term obsolescence mitigation.
Supply support for SN74LS08MEL 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
ON Semiconductor is a global semiconductor manufacturer specializing in power management, analog, sensor, and logic solutions for automotive, industrial, and consumer markets.
The SN74LS08MEL belongs to the classic 74LS logic family, designed for robust, low-power 5 V TTL interoperability in cost-sensitive and reliability-critical digital systems.
FAQ
What is the operating voltage range for SN74LS08MEL?
The SN74LS08MEL operates over a guaranteed supply voltage range of 4.75 V to 5.25 V. This 5 V ±5% tolerance ensures compatibility with standard TTL power rails and supports stable logic transitions even under nominal line regulation drift. All DC and AC specifications in the datasheet are validated across this range, including output drive strength and input threshold levels.
Is SN74LS08MEL pin-compatible with other 74LS08 variants?
Yes, SN74LS08MEL shares identical logic function, pin assignment, and electrical behavior with all 74LS08 variants-including SN74LS08N (PDIP) and SN74LS08D (SOIC). Its SOEIAJ-14 package has the same 14-pin numbering and gate mapping, though mechanical dimensions differ from JEDEC SOIC. Signal routing remains unchanged across variants.
What is the maximum output sink current for SN74LS08MEL?
The SN74LS08MEL guarantees an output sink current (IOL) of 8.0 mA per gate at VOL ≤ 0.4 V. This allows direct driving of multiple standard TTL inputs or low-current LEDs without external buffers. Exceeding this limit risks violating VOL specification and may degrade noise margin or cause overheating under sustained load.
Does SN74LS08MEL support operation outside the 0–70 °C range?
No-SN74LS08MEL is specified only for the commercial temperature range of 0 °C to 70 °C. It is not qualified for extended industrial (−40 to +85 °C) or automotive (−40 to +125 °C) operation. Using it beyond 70 °C may result in increased propagation delay, reduced noise immunity, or output voltage degradation not covered by datasheet guarantees.
Can SN74LS08MEL be used in mixed-voltage systems with 3.3 V logic?
SN74LS08MEL is a 5 V-only TTL device and is not 3.3 V tolerant. Its VIH minimum is 2.0 V, but driving it from 3.3 V CMOS outputs risks marginal high-level recognition and increased static power draw. For 3.3 V systems, use 74LVC08 or similar dual-supply compatible AND gates instead of SN74LS08MEL.
SN74LS08MEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Circuits:
- -
- Number of Inputs:
- -
- Features:
- -
- Voltage - Supply:
- -
- Current - Quiescent (Max):
- -
- Current - Output High, Low:
- -
- Input Logic Level - Low:
- -
- Input Logic Level - High:
- -
- Max Propagation Delay @ V, Max CL:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN74LS08MEL FAQ
1.How can I place an order for SN74LS08MEL through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LS08MEL 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 SN74LS08MEL reliable?
The price and inventory of SN74LS08MEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS08MEL is usually 5 days.
3.What payment methods are accepted for SN74LS08MEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LS08MEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LS08MEL?
SN74LS08MEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LS08MEL 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 SN74LS08MEL?
For technical support, including SN74LS08MEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS08MEL requirements.
6.How does Aetrix verify that SN74LS08MEL is sourced from the original manufacturer or authorized distributors?
All SN74LS08MEL 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 SN74LS08MEL meets industry standards.
7.What is the process for return or replacement of SN74LS08MEL?
All SN74LS08MEL units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS08MEL, 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 SN74LS08MEL part is unused and in its original packaging.
Return procedure for SN74LS08MEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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