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TL4581D Equivalent & Substitute Parts
Part Overview
The TL4581D 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 remaining inventory of 1,107 pieces. The TL4581D operates across a 10V to 30V supply range and delivers 38mA output per channel with a 9V/µs slew rate and 10MHz gain bandwidth product. Finding equivalent and substitute parts is necessary due to the Last Time Buy status and potential future unavailability for new designs or production replenishment.
Substiute Parts
Key Parameters
| Parameter | TL4581D Value | Unit |
|---|---|---|
| Amplifier Type | Audio | — |
| Number of Circuits | 2 | — |
| Slew Rate | 9 | V/µs |
| Gain Bandwidth Product | 10 | MHz |
| Current - Input Bias | 200 | nA |
| Voltage - Input Offset | 500 | µV |
| Current - Supply (per channel) | 8 | mA |
| Current - Output / Channel | 38 | mA |
| Voltage - Supply Span (Min) | 10 | V |
| Voltage - Supply Span (Max) | 30 | V |
| Operating Temperature Range | 0 to 70 | °C |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) | — |
| Mounting Type | Surface Mount | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution of the TL4581D is determined by compatibility across the following critical parameters: dual-channel configuration (2 circuits), 8-SOIC surface mount package, audio amplifier classification, and electrical operating ranges. Substitute parts must maintain the same package footprint to ensure PCB compatibility without redesign. The supply voltage range (minimum 10V to maximum 30V for TL4581D) and output current capability (38mA per channel) establish the baseline performance envelope. Input bias current, input offset voltage, slew rate, and gain bandwidth product define signal fidelity characteristics. Operating temperature range and product status (Active vs. Last Time Buy) influence long-term availability and design lifecycle considerations.
Substitutes are grouped into two categories: direct audio amplifier replacements that maintain audio-specific performance characteristics, and general-purpose amplifier alternatives that provide broader supply voltage ranges and extended temperature operation at the cost of different electrical characteristics.
Parameter Comparison
| Part Number | Manufacturer | Amplifier Type | Slew Rate (V/µs) | GBW (MHz) | Input Bias (nA) | Input Offset (µV) | Supply Current (mA) | Output Current (mA) | Supply Min (V) | Supply Max (V) | Temp Range (°C) | Status |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| TL4581D | Texas Instruments | Audio | 9 | 10 | 200 | 500 | 8 | 38 | 10 | 30 | 0 to 70 | Last Time Buy |
| RC4580IDR | Texas Instruments | Audio | 5 | 12 | 100 | 500 | 6 | 50 | 4 | 32 | -40 to 85 | Active |
| AD8672ARZ | Analog Devices Inc. | General Purpose | 4 | 10 | 3 | 20 | 3 | 20 | 10 | 36 | -40 to 125 | Active |
| AD8672ARZ-REEL | Analog Devices Inc. | General Purpose | 4 | 10 | 3 | 20 | 3 | 20 | 10 | 36 | -40 to 125 | Active |
| AD8672ARZ-REEL7 | Analog Devices Inc. | General Purpose | 4 | 10 | 3 | 20 | 3 | 20 | 10 | 36 | -40 to 125 | Active |
| AS358AMTR-E1 | Diodes Incorporated | General Purpose | — | — | 20 | 2000 | 0.7 | 40 | 3 | 36 | -40 to 85 | Active |
| AS358AMTR-G1 | Diodes Incorporated | General Purpose | — | — | 20 | 2000 | 0.7 | 40 | 3 | 36 | -40 to 85 | Active |
| LF253DT | STMicroelectronics | J-FET | 16 | 4 | 0.02 | 3000 | 1.4 | 40 | 6 | 36 | -40 to 105 | Active |
| LF353DT | STMicroelectronics | J-FET | 16 | 4 | 0.02 | 3000 | 1.4 | 40 | 6 | 36 | 0 to 70 | Active |
| LM833DR2G | onsemi | Audio | 7 | 15 | 300 | 300 | 4 | 29 | 10 | 36 | -40 to 85 | Active |
| LM833DT | STMicroelectronics | Audio | 7 | 15 | 300 | 300 | 4 | 37 | 5 | 30 | -40 to 105 | Active |
Engineering Selection Recommendations
Direct Audio Amplifier Substitutes (Recommended Primary Options)
RC4580IDR (Texas Instruments) is the manufacturer-recommended substitute and maintains audio amplifier classification. This part offers Active product status with extended availability, improved input bias current (100nA vs. 200nA), higher output current capability (50mA vs. 38mA), and extended operating temperature range (-40°C to 85°C). The RC4580IDR operates across a wider supply voltage range (4V to 32V) compared to the TL4581D (10V to 30V), providing greater design flexibility. Both parts are ROHS3 compliant with MSL 1 rating.
LM833DR2G (onsemi) and LM833DT (STMicroelectronics) are audio amplifier alternatives with Active status. These devices deliver higher gain bandwidth product (15MHz vs. 10MHz) and improved slew rate performance (7V/µs vs. 9V/µs). The LM833DT variant supports extended temperature operation (-40°C to 105°C) and operates across 5V to 30V supply range, closely matching the TL4581D supply envelope. Output current per channel is comparable (29mA to 37mA). Both maintain ROHS3 compliance and MSL 1 rating.
General-Purpose Amplifier Alternatives (Extended Performance)
AD8672ARZ, AD8672ARZ-REEL, and AD8672ARZ-REEL7 (Analog Devices Inc.) provide general-purpose amplifier functionality with superior input characteristics: input bias current of 3nA (67× lower than TL4581D) and input offset voltage of 20µV (25× lower than TL4581D). These parts support extended temperature operation (-40°C to 125°C) and higher maximum supply voltage (36V). Trade-offs include lower output current per channel (20mA vs. 38mA) and reduced slew rate (4V/µs vs. 9V/µs). All variants are Active with ROHS3 compliance and MSL 1 rating. Packaging variants (tube, reel, reel7) accommodate different procurement and assembly workflows.
AS358AMTR-E1 and AS358AMTR-G1 (Diodes Incorporated) are general-purpose amplifiers with lowest supply voltage minimum (3V) and highest maximum supply voltage (36V). These parts feature low supply current (0.7mA per channel) suitable for battery-powered applications. Input offset voltage is higher (2mV vs. 500µV), and slew rate data is not provided. Operating temperature range is -40°C to 85°C. AS358AMTR-G1 carries MSL 3 rating (168 hours) versus MSL 1 for other substitutes. Both are Active with ROHS3 compliance.
J-FET Amplifier Alternatives (Specialized Applications)
LF253DT and LF353DT (STMicroelectronics) employ J-FET input architecture with extremely low input bias current (20pA vs. 200nA). These parts deliver higher slew rate (16V/µs vs. 9V/µs) but lower gain bandwidth product (4MHz vs. 10MHz). LF253DT supports extended temperature operation (-40°C to 105°C) while LF353DT matches the TL4581D temperature range (0°C to 70°C). Both operate across 6V to 36V supply range and deliver 40mA output current per channel. J-FET architecture introduces higher input offset voltage (3mV vs. 500µV). Both are Active with ROHS3 compliance and MSL 1 rating.
Frequently Asked Questions (FAQ)
Q: Can RC4580IDR directly replace TL4581D without PCB modifications?
A: Yes. Both devices use identical 8-SOIC (0.154", 3.90mm width) surface mount packaging with the same pinout configuration. No PCB layout changes are required. RC4580IDR is the manufacturer-recommended substitute with Active product status and superior availability.
Q: What are the key electrical differences between TL4581D and RC4580IDR?
A: RC4580IDR provides lower input bias current (100nA vs. 200nA), higher output current capability (50mA vs. 38mA), and extended operating temperature range (-40°C to 85°C vs. 0°C to 70°C). Supply voltage range expands from 10-30V to 4-32V. Slew rate decreases from 9V/µs to 5V/µs, and gain bandwidth product increases from 10MHz to 12MHz.
Q: Why would I choose AD8672ARZ over audio-specific amplifiers?
A: AD8672ARZ is selected when superior input signal fidelity is required. Input bias current is 67× lower (3nA vs. 200nA) and input offset voltage is 25× lower (20µV vs. 500µV). Extended temperature operation (-40°C to 125°C) and higher maximum supply voltage (36V) support demanding applications. Trade-off is reduced output current per channel (20mA vs. 38mA).
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All substitute parts listed carry ROHS3 compliance certification. The TL4581D also maintains ROHS3 compliance. All parts are REACH Unaffected with EAR99 ECCN classification.
Q: What is the difference between AD8672ARZ, AD8672ARZ-REEL, and AD8672ARZ-REEL7?
A: These three part numbers are electrically identical with identical electrical specifications. The differences are packaging and delivery format: AD8672ARZ ships in Tube packaging, while AD8672ARZ-REEL and AD8672ARZ-REEL7 ship in Cut Tape with Digi-Reel format. Selection depends on assembly line requirements and procurement preferences.
Q: Can LF253DT or LF353DT replace TL4581D in audio applications?
A: LF253DT and LF353DT use J-FET input architecture and are functionally compatible in 8-SOIC package. However, electrical characteristics differ significantly: lower gain bandwidth product (4MHz vs. 10MHz), higher input offset voltage (3mV vs. 500µV), and higher slew rate (16V/µs vs. 9V/µs). These devices are suitable for applications prioritizing extremely low input bias current (20pA) over bandwidth performance.
Q: What is the moisture sensitivity level (MSL) and why does it matter?
A: MSL indicates how long a component can be exposed to ambient humidity before soldering. TL4581D and most substitutes carry MSL 1 (Unlimited), meaning no time restrictions. AS358AMTR-G1 carries MSL 3 (168 hours), requiring storage in dry conditions and limiting shelf life after packaging opening. MSL 1 components offer greater handling flexibility in manufacturing environments.
Q: Which substitute offers the widest supply voltage range?
A: AS358AMTR-E1 and AS358AMTR-G1 support the widest range: 3V to 36V. This 33V span accommodates single-cell battery operation (3V minimum) through high-voltage industrial supplies (36V maximum). TL4581D operates 10V to 30V, a 20V span. RC4580IDR extends this to 4V to 32V, a 28V span.
Q: Is LM833DT a better choice than LM833DR2G?
A: Both are electrically identical audio amplifiers from different manufacturers (STMicroelectronics vs. onsemi). LM833DT supports extended temperature operation (-40°C to 105°C vs. -40°C to 85°C) and lower minimum supply voltage (5V vs. 10V). LM833DR2G ships in Tape & Reel format while LM833DT ships in Cut Tape format. Selection depends on temperature requirements and assembly line packaging compatibility.
Q: Can I use AS358AMTR for audio applications requiring high fidelity?
A: AS358AMTR devices are general-purpose amplifiers with input offset voltage of 2mV, significantly higher than audio-optimized parts (TL4581D at 500µV, LM833 at 300µV). For audio applications requiring low distortion and minimal DC offset, audio-specific amplifiers (RC4580IDR, LM833 series) are preferred. AS358AMTR is suitable for general signal conditioning and non-audio applications.
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