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onsemi DM74AS32SJX
- Part No.:
- DM74AS32SJX
- Manufacturer:
- onsemi
- Category:
- Gates and Inverters
- Package:
- 14-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
DM74AS32SJX.pdf
- Description:
- IC GATE OR 4CH 2-INP 14SOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,102
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Product details
Overview
DM74AS32SJX from Fairchild Semiconductor is a quad 2-input OR gate IC in 14-lead SOP (EIAJ TYPE II, 5.3 mm wide) package, operating at VCC = 4.5–5.5 V, with propagation delays as low as 1 ns (tPLH/tPHL), ±2 mA IOH, 20 mA IOL, and guaranteed performance across 0°C to +70°C. It performs discrete logic OR functions in TTL-compatible digital control subsystems.
For engineers reviewing the DM74AS32SJX datasheet, pinout, applications, or equivalent options, key selection criteria include its Schottky TTL process, 50 pF load switching specs, pin-for-pin compatibility with standard TTL OR gates, and verified operation under full industrial temperature and supply voltage ranges.
Technical Context
The DM74AS32SJX implements four independent 2-input OR logic gates using oxide-isolated, ion-implanted Schottky TTL technology. Each gate accepts TTL-level inputs (VIL ≤ 0.8 V, VIH ≥ 2.0 V) and drives standard TTL loads with VOH ≥ VCC − 2 V and VOL ≤ 0.5 V at IOL = 20 mA.
Its AC performance is characterized at CL = 50 pF and RL = 500 Ω, delivering tPLH/tPHL of 1–5.8 ns over VCC = 4.5–5.5 V and TA = 0–70°C. The device is not designed for open-collector or three-state operation and lacks internal pull-ups or enable controls.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures compatibility with standard 5 V TTL power rails and tolerance against supply ripple. |
| Propagation Delay | 1 ns (min) to 5.8 ns (max) - enables high-speed combinational logic in clocked control paths up to ~150 MHz toggle rate. |
| IOL / IOH | 20 mA / −2 mA - supports direct drive of multiple standard TTL inputs (fan-out ≥ 20) without external buffers. |
| VIL / VIH | 0.8 V / 2.0 V - provides robust noise margin (>0.4 V) against TTL signal degradation in noisy industrial environments. |
| Operating Temperature | 0°C to +70°C - validated for commercial-grade embedded control, instrumentation, and peripheral interface applications. |
| Input Clamp Voltage | −1.2 V - protects inputs from negative transients during hot insertion or ESD events without external diodes. |
Pinout & Package
DM74AS32SJX is housed in a 14-lead Small Outline Package (SOP), EIAJ TYPE II, 5.3 mm wide (Package Number M14D), with gull-wing leads and standard JEDEC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 5, 8, 9, 11, 12 | Input A/B per OR gate | Dedicated TTL-compatible inputs for four independent 2-input OR functions (Gates 1–4). |
| 3, 6, 10, 13 | Output Y per OR gate | Active-high CMOS/TTL-compatible outputs; each drives 20 mA sink current. |
| 7 | GND | Power return reference for all gates; must be low-impedance connection to minimize ground bounce. |
| 14 | VCC | Positive supply terminal; requires local 0.1 µF ceramic decoupling adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Advanced Schottky TTL process | Oxide-isolated, ion-implanted fabrication delivers higher speed and lower power than standard LS-TTL, with no latch-up risk. |
| Full-range AC/DC characterization | Switching and DC parameters guaranteed over entire 0°C–70°C and 4.5–5.5 V range - eliminates derating calculations. |
| Pin-for-pin compatibility | Direct replacement for 74S32, 74LS32, and 74ALS32 in existing PCB layouts without redesign. |
| 50 pF load switching specs | Propagation delay and output drive validated at industry-standard capacitive load - simplifies timing analysis in bus-driven systems. |
Applications
| Industrial Control Logic | Test Equipment Signal Routing |
|---|---|
Use Scenario: Combining status signals from multiple sensors (e.g., limit switches, pressure thresholds) into a single fault-alert line in PLC I/O modules. IC Role / Device Role / Timing Role: Discrete OR logic element aggregating asynchronous digital inputs with sub-6 ns propagation for real-time response. Use Value: Eliminates need for microcontroller polling or FPGA logic resources; reduces BOM count and board area in space-constrained DIN-rail modules. | Use Scenario: Enabling multiplexed signal path selection in automated test equipment where multiple DUT outputs feed a shared measurement channel. IC Role / Device Role / Timing Role: Fast-gating combiner for pass/fail indicators or trigger arbitration between parallel test stations. Use Value: Sub-6 ns delay ensures precise synchronization of test result aggregation without adding jitter to timing-critical measurement windows. |
| Legacy System Repair | Power Sequencing Supervision |
Use Scenario: Replacing obsolete 74S32 or 74LS32 in field-repair of aging telecom line cards and broadcast infrastructure gear. IC Role / Device Role / Timing Role: Drop-in logic gate maintaining identical pinout, voltage thresholds, and fan-out capability. Use Value: Restores full functionality without PCB rework or firmware updates; supports long-term serviceability of end-of-life systems. | Use Scenario: Monitoring multiple power rail OK signals (e.g., +3.3 V, +5 V, +12 V) to generate a global "Power Good" enable for downstream logic. IC Role / Device Role / Timing Role: OR-combining of independent POR outputs to assert system reset release only after all rails stabilize. Use Value: Provides deterministic, glitch-free startup sequencing with no software dependency or timing uncertainty from RC delays. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OR gate applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AS32DR | Same AS-series Schottky TTL architecture; identical VCC, VIH/VIL, IOL/IOH, and tPLH/tPHL specs; SOIC-14 (JEDEC MS-012) package. | Identical logic function and timing; differs only in manufacturer branding and tape-and-reel packaging code. | Select when TI-sourced supply chain alignment or dual-sourcing strategy is required. |
| 74VHC32M | CMOS-based (VHC family); operates from 2–5.5 V; VIH/VIL ratio-based thresholds; IOL = 8 mA (max); tPD ≈ 7.5 ns @ 5 V, 50 pF. | Lower static power and wider supply range, but reduced drive strength and slower propagation vs. DM74AS32SJX. | Prefer for battery-powered or mixed-voltage systems where speed is secondary to power efficiency. |
Compared with SN74AS32DR, DM74AS32SJX offers identical electrical behavior and drop-in layout compatibility; versus 74VHC32M, it delivers superior speed and drive strength at the cost of higher quiescent current and strict 5 V operation.
Availability
DM74AS32SJX is available at Aetrix Electronics and suitable for industrial control logic, legacy system repair, test equipment signal routing, and power sequencing supervision requiring stable component supply and long-term obsolescence management.
Supply support for DM74AS32SJX 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
Fairchild Semiconductor was a U.S.-based analog and discrete semiconductor company, acquired by ON Semiconductor in 2016; known for high-performance TTL, MOSFETs, and power management ICs.
The DM74AS32SJX belongs to Fairchild's advanced Schottky TTL logic family, engineered for high-speed, noise-immune digital control in commercial and industrial systems where reliability and pin compatibility outweigh ultra-low power requirements.
FAQ
What logic family does the DM74AS32SJX belong to, and how does it differ from standard TTL?
The DM74AS32SJX belongs to the Advanced Schottky TTL (AS-TTL) family. It uses oxide-isolated, ion-implanted Schottky diodes to reduce saturation delay, achieving faster switching (1–5.8 ns) and lower power than standard 74TTL or 74S-TTL. Unlike standard TTL, DM74AS32SJX guarantees AC/DC specs across full 0°C–70°C and 4.5–5.5 V, and features improved input clamp voltage (−1.2 V) for transient protection. Its logic behavior remains fully TTL-compatible.
Is the DM74AS32SJX pin-compatible with other 74-series OR gates like the 74LS32 or 74S32?
Yes, the DM74AS32SJX is explicitly specified as functionally and pin-for-pin compatible with 74S32, 74LS32, and 74ALS32 devices. All share identical 14-pin SOP/SOIC/DIP pinouts, same input/output voltage thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V), and matching logic functions. This allows direct substitution in legacy designs without PCB or firmware changes - confirmed in Fairchild's DS006280 datasheet revision March 2000.
What is the maximum capacitive load the DM74AS32SJX can drive while maintaining guaranteed propagation delay?
The DM74AS32SJX switching characteristics - including tPLH and tPHL - are guaranteed at CL = 50 pF, as stated in the "Switching Characteristics" table of the official datasheet. Driving loads significantly above 50 pF will increase propagation delay beyond the 5.8 ns maximum and may cause marginal timing in high-speed systems. For heavier loads, buffer stages or lower-capacitance routing should be used. The device is not rated for transmission-line driving or bus termination.
Does the DM74AS32SJX support operation at 3.3 V supply voltage?
No, the DM74AS32SJX does not support 3.3 V operation. Its recommended VCC range is strictly 4.5 V to 5.5 V, with absolute maximum rating of 7 V. At 3.3 V, the internal Schottky-clamped transistor structure fails to saturate correctly, resulting in undefined logic levels, excessive propagation delay, and potential output contention. For 3.3 V systems, consider CMOS alternatives such as 74LVC32 or 74AHC32 instead of DM74AS32SJX.
What is the thermal resistance (θJA) of the DM74AS32SJX in its SOP package?
The DM74AS32SJX in the 14-lead SOP package (EIAJ TYPE II, 5.3 mm wide, Package Number M14D) has a typical junction-to-ambient thermal resistance (θJA) of 114.0°C/W, as documented in the "Absolute Maximum Ratings" section of the Fairchild DS006280 datasheet. This value assumes standard JEDEC 2-layer board conditions; actual θJA may improve with added copper pour or airflow, but derating is required above 70°C ambient to maintain safe junction temperature.
DM74AS32SJX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74AS
- Package/Case:
- 14-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- OR Gate
- Number of Circuits:
- 4
- Number of Inputs:
- 2
- Features:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Max):
- -
- Current - Output High, Low:
- 2mA, 20mA
- Input Logic Level - Low:
- 0.8V
- Input Logic Level - High:
- 2V
- Max Propagation Delay @ V, Max CL:
- 5.8ns @ 5V, 50pF
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOP
DM74AS32SJX FAQ
1.How can I place an order for DM74AS32SJX through Aetrix?
Please submit a Request for Quotation (RFQ) for DM74AS32SJX 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 DM74AS32SJX reliable?
The price and inventory of DM74AS32SJX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DM74AS32SJX is usually 5 days.
3.What payment methods are accepted for DM74AS32SJX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DM74AS32SJX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DM74AS32SJX?
DM74AS32SJX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DM74AS32SJX 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 DM74AS32SJX?
For technical support, including DM74AS32SJX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DM74AS32SJX requirements.
6.How does Aetrix verify that DM74AS32SJX is sourced from the original manufacturer or authorized distributors?
All DM74AS32SJX 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 DM74AS32SJX meets industry standards.
7.What is the process for return or replacement of DM74AS32SJX?
All DM74AS32SJX units undergo pre-shipment inspection (PSI). If there is an issue with DM74AS32SJX, 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 DM74AS32SJX part is unused and in its original packaging.
Return procedure for DM74AS32SJX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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