HEF4538BT-Q100J

Basic Information Overview

• Category: Integrated Circuit (IC)
• Use: Timer/Counter
• Characteristics: High-performance, automotive-grade, dual precision monostable multivibrator
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: Reliable timing and counting functionality for automotive applications
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage: 3V to 15V
• Operating Temperature Range: -40°C to +125°C
• Output Current: 4.2mA
• Propagation Delay Time: 45ns
• Trigger Voltage: 1.5V
• Reset Voltage: 0.8V

Detailed Pin Configuration

The HEF4538BT-Q100J has a total of 16 pins. The pin configuration is as follows:

1. Pin 1: VDD (Positive Power Supply)
2. Pin 2: Trigger Input A
3. Pin 3: Trigger Input B
4. Pin 4: Reset Input
5. Pin 5: Control Voltage Input
6. Pin 6: Threshold Input
7. Pin 7: Discharge Output
8. Pin 8: Output Q
9. Pin 9: Output Q̅ (Complementary Output)
10. Pin 10: Ground (GND)
11. Pin 11: Control Voltage Input
12. Pin 12: Threshold Input
13. Pin 13: Discharge Output
14. Pin 14: Output Q
15. Pin 15: Output Q̅ (Complementary Output)
16. Pin 16: VDD (Positive Power Supply)

Functional Features

• Dual monostable multivibrator with independent trigger inputs
• Precise timing control with adjustable control voltage and threshold inputs
• Reliable operation in automotive environments with high temperature and voltage variations
• Low power consumption and fast propagation delay time for efficient performance

Advantages

• Automotive-grade quality ensures reliable operation in harsh conditions
• Dual monostable multivibrator allows for versatile timing applications
• Adjustable control voltage and threshold inputs provide flexibility in timing control
• Fast propagation delay time enables accurate timing measurements

Disadvantages

• Limited output current may restrict certain high-power applications
• Requires external components for complete circuit implementation
• Higher cost compared to non-automotive grade timer/counters

Working Principles

The HEF4538BT-Q100J is a dual precision monostable multivibrator that generates a pulse of a specific duration when triggered. It operates based on the charging and discharging of an external capacitor connected to the control voltage and threshold inputs. The trigger inputs determine the start of the timing cycle, while the reset input terminates it. The output Q provides the timed pulse, and the complementary output Q̅ is its inverse.

Detailed Application Field Plans

The HEF4538BT-Q100J is widely used in automotive applications that require precise timing and counting functionality. Some specific application fields include: 1. Engine control units (ECUs) for ignition timing control 2. Transmission control modules for gear shifting synchronization 3. ABS (Anti-lock Braking System) controllers for wheel speed measurement 4. Airbag systems for deployment timing control 5. Lighting control modules for sequential lighting effects

Detailed and Complete Alternative Models

1. CD4538BCN: Non-automotive grade dual precision monostable multivibrator
2. MC14538B: Dual retriggerable/resettable monostable multivibrator
3. NE555P: General-purpose timer IC with adjustable timing functionality
4. TLC555CP: Low-power CMOS timer IC with adjustable timing range

Note: These alternative models may have different specifications and package options. It is important to select the appropriate model based on specific application requirements.

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