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TL4581DR Audio Amplifier 2 Circuit 8-SOIC Equivalent & Substitute Parts
Part Overview
The TL4581DR is a dual-channel audio amplifier integrated circuit manufactured by Texas Instruments in 8-SOIC surface mount packaging. This device is classified as Last Time Buy, indicating discontinued production with limited inventory availability (1375 Pcs in stock). The TL4581DR operates across a 10V to 30V supply range and delivers 38 mA output per channel, making it suitable for audio amplification applications requiring moderate output current and bandwidth.
Due to Last Time Buy status, identifying functionally equivalent substitute parts is essential for design continuity and long-term supply chain planning. Substitute parts must maintain compatibility with the 8-SOIC package format and satisfy the electrical performance requirements of audio amplifier circuits.
Substiute Parts
Key Parameters
| Parameter | TL4581DR Value | Unit |
|---|---|---|
| Amplifier Type | Audio | — |
| Number of Circuits | 2 | Channels |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) | — |
| Slew Rate | 9 | V/µs |
| Gain Bandwidth Product | 10 | MHz |
| Current - Input Bias | 200 | nA |
| Voltage - Input Offset | 500 | µV |
| Current - Supply | 8 (x2 Channels) | mA |
| Current - Output / Channel | 38 | mA |
| Voltage - Supply Span (Min) | 10 | V |
| Voltage - Supply Span (Max) | 30 | V |
| Operating Temperature | 0 to 70 | °C |
| Mounting Type | Surface Mount | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitute parts for the TL4581DR are selected based on strict electrical and mechanical compatibility criteria. The following parameters determine substitution eligibility:
Primary Compatibility Criteria:
- Package format: 8-SOIC (0.154", 3.90mm Width) — mandatory for direct PCB replacement
- Number of circuits: 2 channels — required for dual-channel audio applications
- Mounting type: Surface Mount — required for existing assembly processes
- Supply voltage range: Minimum 10V to maximum 30V overlap — ensures operation within design specifications
- Output current per channel: Minimum 38 mA — maintains drive capability for audio loads
Secondary Performance Criteria:
- Slew rate: 9 V/µs or higher — preserves audio signal fidelity
- Gain bandwidth product: 10 MHz or higher — maintains frequency response
- Input bias current: 200 nA or lower — reduces DC offset drift
- Input offset voltage: 500 µV or lower — minimizes audio distortion
Substitute parts are grouped into two categories: Direct Audio Amplifier Substitutes (RC4580IDR) and General Purpose Amplifier Alternatives (AD8672 series, AS358 series, LF253DT, LF353DT). General purpose amplifiers meet all electrical criteria but operate across broader temperature and supply ranges, offering enhanced performance margins.
Parameter Comparison
| Parameter | TL4581DR | RC4580IDR | AD8672ARZ | AD8672ARZ-REEL | AD8672ARZ-REEL7 | AS358AMTR-E1 | AS358AMTR-G1 | AS358MTR-E1 | AS358MTR-G1 | LF253DT | LF353DT |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Amplifier Type | Audio | Audio | General Purpose | General Purpose | General Purpose | General Purpose | General Purpose | General Purpose | General Purpose | J-FET | J-FET |
| Number of Circuits | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| Package / Case | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Slew Rate (V/µs) | 9 | 5 | 4 | 4 | 4 | — | — | — | — | 16 | 16 |
| Gain Bandwidth Product (MHz) | 10 | 12 | 10 | 10 | 10 | — | — | — | — | 4 | 4 |
| Current - Input Bias (nA) | 200 | 100 | 3 | 3 | 3 | 20 | 20 | 20 | 20 | 0.02 | 0.02 |
| Voltage - Input Offset (µV) | 500 | 500 | 20 | 20 | 20 | 2000 | 2000 | 2000 | 2000 | 3000 | 3000 |
| Current - Supply (mA) | 8 (x2) | 6 | 3 (x2) | 3 (x2) | 3 (x2) | 0.7 (x2) | 0.7 (x2) | 0.7 (x2) | 0.7 (x2) | 1.4 (x2) | 1.4 (x2) |
| Current - Output / Channel (mA) | 38 | 50 | 20 | 20 | 20 | 40 | 40 | 40 | 40 | 40 | 40 |
| Voltage - Supply Span Min (V) | 10 | 4 | 10 | 10 | 10 | 3 | 3 | 3 | 3 | 6 | 6 |
| Voltage - Supply Span Max (V) | 30 | 32 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 |
| Operating Temperature (°C) | 0 to 70 | -40 to 85 | -40 to 125 | -40 to 125 | -40 to 125 | -40 to 85 | -40 to 85 | -40 to 85 | -40 to 85 | -40 to 105 | 0 to 70 |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 3 (168 Hours) | 3 (168 Hours) | 3 (168 Hours) | 1 (Unlimited) | 1 (Unlimited) |
Engineering Selection Recommendations
RC4580IDR (Texas Instruments)
RC4580IDR is the manufacturer-recommended direct substitute for TL4581DR. Both devices are audio amplifiers from Texas Instruments with identical 8-SOIC packaging and dual-channel configuration. RC4580IDR offers superior specifications: higher gain bandwidth product (12 MHz vs. 10 MHz), lower input bias current (100 nA vs. 200 nA), and higher output current per channel (50 mA vs. 38 mA). RC4580IDR operates across an extended supply range (4V to 32V) and temperature range (-40°C to 85°C), providing broader design margins. Product status is Active with 226,800 units in stock, ensuring long-term availability. RoHS3 compliance and MSL 1 rating match the original part. This substitute is recommended for direct PCB replacement without circuit modification.
AD8672ARZ / AD8672ARZ-REEL / AD8672ARZ-REEL7 (Analog Devices Inc.)
The AD8672 series comprises general-purpose operational amplifiers with dual channels in 8-SOIC packaging. All three variants (AD8672ARZ, AD8672ARZ-REEL, AD8672ARZ-REEL7) share identical electrical specifications and differ only in packaging format (Tube vs. Cut Tape & Digi-Reel). AD8672 devices deliver exceptional input characteristics: 3 nA input bias current and 20 µV input offset voltage, significantly superior to TL4581DR. Output current per channel is 20 mA, lower than TL4581DR's 38 mA, limiting suitability for high-current audio loads. Supply range (10V to 36V) encompasses TL4581DR requirements. Operating temperature extends to -40°C to 125°C. All variants are Active status with substantial inventory (5,380 to 100,400 units). RoHS3 compliance and MSL 1 rating are maintained. AD8672 series is suitable for audio applications where low input offset and bias current are prioritized over output current capability.
AS358AMTR-E1 / AS358AMTR-G1 / AS358MTR-E1 / AS358MTR-G1 (Diodes Incorporated)
The AS358 series from Diodes Incorporated comprises general-purpose dual-channel operational amplifiers in 8-SOIC packaging. Four variants differ in packaging format (Tape & Reel vs. Cut Tape & Digi-Reel) and moisture sensitivity level (MSL 1 vs. MSL 3). AS358 devices provide 40 mA output current per channel, exceeding TL4581DR's 38 mA. Input bias current is 20 nA, substantially lower than TL4581DR's 200 nA. Input offset voltage is 2 mV, higher than TL4581DR's 500 µV specification. Supply range (3V to 36V) exceeds TL4581DR minimum requirement. Operating temperature range is -40°C to 85°C. All variants are Active status with high inventory availability (24,300 to 300,300 units). RoHS3 compliance is maintained. AS358AMTR-E1 and AS358MTR-E1 maintain MSL 1 (Unlimited) rating matching TL4581DR; AS358AMTR-G1 and AS358MTR-G1 carry MSL 3 (168 Hours) rating. AS358 series is suitable for general-purpose audio applications with lower supply voltage requirements and reduced input bias current sensitivity.
LF253DT (STMicroelectronics)
LF253DT is a J-FET input dual-channel operational amplifier in 8-SOIC packaging from STMicroelectronics. This device features exceptionally low input bias current (20 pA), orders of magnitude lower than TL4581DR's 200 nA, making it ideal for high-impedance audio signal conditioning. Slew rate is 16 V/µs, exceeding TL4581DR's 9 V/µs. Gain bandwidth product is 4 MHz, lower than TL4581DR's 10 MHz. Output current per channel is 40 mA, matching TL4581DR's capability. Supply range (6V to 36V) encompasses TL4581DR requirements. Operating temperature extends to -40°C to 105°C. Product status is Active with 72,138 units in stock. RoHS3 compliance and MSL 1 rating are maintained. LF253DT is suitable for audio preamplifier and signal conditioning applications where ultra-low input bias current is essential.
LF353DT (STMicroelectronics)
LF353DT is a J-FET input dual-channel operational amplifier in 8-SOIC packaging from STMicroelectronics, functionally identical to LF253DT with identical electrical specifications. The distinction is operating temperature range: LF353DT operates 0°C to 70°C, matching TL4581DR's temperature specification exactly. Input bias current is 20 pA (ultra-low J-FET input). Slew rate is 16 V/µs. Gain bandwidth product is 4 MHz. Output current per channel is 40 mA. Supply range is 6V to 36V. Product status is Active with 6,520 units in stock. RoHS3 compliance and MSL 1 rating are maintained. LF353DT is recommended for audio applications requiring J-FET input characteristics and matching the original TL4581DR operating temperature range.
Frequently Asked Questions (FAQ)
Q: Can RC4580IDR replace TL4581DR without circuit modification?
A: Yes. RC4580IDR is the manufacturer-recommended substitute with identical 8-SOIC package, dual-channel configuration, and pinout. Both are audio amplifiers from Texas Instruments. RC4580IDR offers superior performance (higher bandwidth, lower input bias current, higher output current) and extended operating ranges, ensuring full compatibility. No circuit modification is required.
Q: What is the key difference between audio amplifiers (TL4581DR, RC4580IDR) and general-purpose amplifiers (AD8672, AS358)?
A: Audio amplifiers are optimized for audio frequency response and output current delivery. General-purpose amplifiers prioritize low input offset voltage and bias current across broader frequency ranges. For audio applications, audio-specific devices (TL4581DR, RC4580IDR) are preferred. General-purpose alternatives (AD8672, AS358) are acceptable if output current requirements are lower and input precision is prioritized.
Q: Why does AD8672ARZ have lower output current (20 mA) than TL4581DR (38 mA)?
A: AD8672 is designed as a general-purpose operational amplifier optimized for precision and low power consumption, not high-current audio output. For applications requiring 38 mA per channel, AD8672 is unsuitable. RC4580IDR (50 mA), AS358 series (40 mA), or LF253DT/LF353DT (40 mA) are appropriate alternatives.
Q: What does MSL (Moisture Sensitivity Level) mean for component selection?
A: MSL indicates moisture absorption sensitivity during storage and handling. MSL 1 (Unlimited) means the component has no moisture sensitivity restrictions and can be stored indefinitely. MSL 3 (168 Hours) requires storage in dry conditions and limits shelf life to 168 hours after moisture exposure. For long-term inventory, MSL 1 components (TL4581DR, RC4580IDR, AD8672 series, LF253DT, LF353DT) are preferred over MSL 3 variants (AS358AMTR-G1, AS358MTR-G1).
Q: Can LF253DT or LF353DT replace TL4581DR in audio amplifier circuits?
A: LF253DT and LF353DT are J-FET input amplifiers with ultra-low input bias current (20 pA vs. 200 nA), making them superior for high-impedance audio signal conditioning. However, their 4 MHz gain bandwidth product is lower than TL4581DR's 10 MHz, potentially limiting high-frequency audio response. These devices are suitable for audio preamplifiers and low-frequency audio applications but not for broadband audio amplification requiring 10 MHz bandwidth.
Q: What is the significance of supply voltage range compatibility?
A: TL4581DR requires 10V to 30V supply. Substitutes must operate within this range. RC4580IDR (4V to 32V) and AD8672 (10V to 36V) fully encompass this range. AS358 (3V to 36V) and LF253DT/LF353DT (6V to 36V) also accommodate TL4581DR's supply requirements. Devices with supply ranges below 10V minimum (AS358 at 3V) offer additional design flexibility for lower-voltage applications.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All substitute parts listed (RC4580IDR, AD8672 series, AS358 series, LF253DT, LF353DT) are RoHS3 compliant, matching TL4581DR's environmental certification. This ensures compatibility with RoHS-regulated applications and procurement requirements.
Q: Which substitute offers the best overall performance for audio applications?
A: RC4580IDR is the optimal substitute, offering audio-specific design, superior specifications (12 MHz bandwidth, 50 mA output current, 100 nA input bias), extended operating ranges, and Active product status with high inventory. For applications prioritizing ultra-low input bias current, LF253DT or LF353DT are preferred. For cost-optimized general-purpose audio, AS358 series provides adequate performance with lower supply current consumption.
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