Texas Instruments

OPA1688 - 36V, 10MHz Low Distortion Audio Op Amp | TI

Name: OPA1688
Brand: Texas Instruments
Price: 0.95 USD
Availability: InStock

MPN: OPA1688 ✓ Active

In Stock Ships in 1-3 business days

4.5 V to 36 V (±2.25 V to ±18 V) Vdss ±75 mA Id SOIC-8, WSON-8 Package

From $0.95 USD / Unit

MOQ: 1 |

Price updated: 2026-08-25

Volume Pricing

Qty	Unit Price	Extended
1	$1.85	$1.85
10	$1.65	$16.50
100	$1.32	$132.00
500	$1.12	$560.00
1,000	$0.95	$950.00

ℹ️ All prices are in USD

View Datasheet (PDF) View Alternatives

Quantity

Drop-in alternatives for OPA1688 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.

Quick Comparison Tool — Select alternative parts for side-by-side comparison:

OPA1688IDRGT

✅ Drop-In

📦 WSON-8

Same die, WSON-8 package instead of SOIC-8

📋 Reference alternative (not in catalog)

OPA1688IDR

✅ Drop-In

📦 SOIC-8

Same die, SOIC-8 package

📋 Reference alternative (not in catalog)

OPA1652

⚡ Same Package

📦 SOIC-8

Lower quiescent current, different pinout

📋 Reference alternative (not in catalog)

OPA1622

⚡ Same Package

📦 SOIC-8

Higher output current, different pinout

📋 Reference alternative (not in catalog)

OPA2172

⚡ Same Package

Texas Instruments

📦 SOIC-8

2 · +4.5 V to +36 V, ±2.25 V to ±18 V · 10 MHz · 10 V/µs · ±0.2 mV · ±0.3 µV/°C · ±8 pA · 1.6 mA

✓ In Stock

$1.05 / Unit

View Datasheet →

OPA1688 Maximum Ratings & Electrical Characteristics

Supply Voltage Range	4.5 V to 36 V (±2.25 V to ±18 V)
Bandwidth	10 MHz
Slew Rate	8 V/µs
Input Voltage Noise Density	4.5 nV/√Hz
THD+N	0.00005% at 1 kHz
Output Current	±75 mA
Quiescent Current per Channel	1.5 mA
Input Offset Voltage	0.5 mV (typical)
Rail-to-Rail Output	Yes
Capacitive Load Stability	Up to 1000 pF
Operating Temperature Range	-40°C to +85°C
Package Options	SOIC-8, WSON-8
Number of Channels	2 (dual)
RoHS Status	Compliant
PSRR	120 dB (typical)

OPA1688 Pin Configuration

Pin 1	OUT A — Output of amplifier A
Pin 2	-IN A — Inverting input of amplifier A
Pin 3	+IN A — Non-inverting input of amplifier A
Pin 4	V- — Negative supply or ground
Pin 5	+IN B — Non-inverting input of amplifier B
Pin 6	-IN B — Inverting input of amplifier B
Pin 7	OUT B — Output of amplifier B
Pin 8	V+ — Positive supply

Safe Operating Area (SOA) & Thermal Characteristics

No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.

Typical Applications

OPA1688 is suitable for 6 applications: Headphone Amplifier, Audio DAC Output Buffer, Active Filter, Professional Audio Mixing Console, Portable Audio Device, Instrumentation Amplifier.

🎧

Headphone Amplifier

The OPA1688 is ideal for headphone amplifiers due to its high output current (±75 mA) and low distortion (0.00005% THD+N). It can drive 16-32 ohm headphones directly, providing clean, powerful audio. Its low noise (4.5 nV/√Hz) ensures a quiet background, and its capacitive load stability up to 1000 pF prevents oscillation with headphone cables. The wide supply range (4.5 V to 36 V) allows use in both portable and desktop amplifiers.

Recommended

OPA1622 (Higher output current alternative for demanding headphone loads) PCM1794A (DAC requiring low-noise output buffer)

🎧

Audio DAC Output Buffer

The OPA1688 serves as an excellent output buffer for audio DACs, providing low output impedance and high drive capability. Its low noise and distortion preserve the DAC's signal integrity, while its rail-to-rail output maximizes dynamic range. The device's 10 MHz bandwidth ensures fast settling for high-resolution audio formats. It is commonly used after delta-sigma DACs to drive line-level outputs or headphones.

Recommended

PCM1794A (High-performance audio DAC requiring output buffering) OPA2134 (Alternative audio op amp for comparison)

🔧

Active Filter

The OPA1688 is well-suited for active filters in audio crossovers and equalizers. Its wide bandwidth (10 MHz) and high slew rate (8 V/µs) allow accurate filtering of audio signals without phase distortion. The low noise and distortion ensure that the filter does not degrade the audio quality. The device's stability with capacitive loads makes it easy to implement Sallen-Key or multiple-feedback topologies.

Recommended

OPA1652 (Lower power alternative for battery-powered filters)

🎧

Professional Audio Mixing Console

In professional mixing consoles, the OPA1688 is used in summing amplifiers and channel strips. Its low noise (4.5 nV/√Hz) and low distortion (0.00005% THD+N) are critical for maintaining signal purity in complex audio paths. The high output current allows driving multiple loads, and the wide supply range accommodates various console power rails. Its dual-channel configuration saves board space.

Recommended

OPA2134 (Classic audio op amp for comparison)

📱

Portable Audio Device

The OPA1688's low quiescent current (1.5 mA per channel) makes it ideal for battery-powered portable audio devices such as MP3 players and smartphones. It provides high-quality audio amplification while conserving battery life. The device operates from a single 4.5 V supply, simplifying power design. Its small SOIC-8 or WSON-8 package fits compact PCBs.

Recommended

OPA1622 (Higher output current for driving low-impedance headphones)

🔧

Instrumentation Amplifier

The OPA1688 can be used in instrumentation amplifiers for precision measurement applications. Its low offset voltage (0.5 mV) and low noise ensure accurate signal acquisition. The wide supply range allows use in industrial sensor interfaces. The device's high common-mode rejection and rail-to-rail output make it suitable for single-supply data acquisition systems.

Recommended

INA219 (Current sensor with analog output requiring amplification)

Recommended Products Summary

OPA1622 Higher output current alternative for demanding headphone loads Used in: Headphone Amplifier, Portable Audio Device PCM1794A DAC requiring low-noise output buffer Used in: Headphone Amplifier, Audio DAC Output Buffer OPA2134 Alternative audio op amp for comparison Used in: Audio DAC Output Buffer, Professional Audio Mixing Console OPA1652 Lower power alternative for battery-powered filters Used in: Active Filter INA219 Current sensor with analog output requiring amplification Used in: Instrumentation Amplifier

What is the supply voltage range of OPA1688?

The OPA1688 operates from 4.5 V to 36 V (±2.25 V to ±18 V). According to the TI datasheet, this wide range allows use in both single-supply and dual-supply configurations, making it versatile for various audio applications.

What is the bandwidth of OPA1688?

The OPA1688 has a bandwidth of 10 MHz. This wide bandwidth ensures minimal phase shift and amplitude loss in audio signals up to 20 kHz, preserving signal integrity in high-fidelity audio systems.

What is the input voltage noise density of OPA1688?

The OPA1688 has an input voltage noise density of 4.5 nV/√Hz. This low noise floor is critical for audio applications where signal-to-noise ratio directly impacts perceived sound quality, especially in low-level signals.

Can OPA1688 drive headphones directly?

Yes, the OPA1688 can drive headphones directly. It provides ±75 mA output current and is stable with capacitive loads up to 1000 pF, making it suitable for driving 16-32 ohm headphones with low distortion.

What is the quiescent current of OPA1688?

The OPA1688 has a quiescent current of 1.5 mA per channel. This low quiescent current is beneficial for battery-powered portable audio devices, extending battery life without compromising audio performance.

What is the THD+N of OPA1688?

The OPA1688 has a THD+N of 0.00005% at 1 kHz. This ultra-low distortion ensures high-fidelity audio reproduction, making it ideal for professional audio equipment and high-end consumer audio.

Is OPA1688 suitable for single-supply operation?

Yes, the OPA1688 is designed for single-supply operation from 4.5 V to 36 V. Its rail-to-rail output allows maximum output swing, making it ideal for single-supply audio circuits where headroom is limited.

What is the difference between OPA1688 and OPA1652?

The OPA1688 and OPA1652 are both audio op amps from TI, but the OPA1688 has a higher bandwidth (10 MHz vs 10 MHz) and lower noise (4.5 nV/√Hz vs 4.5 nV/√Hz). However, the OPA1652 has a lower quiescent current (1.5 mA vs 1.5 mA). They are not pin-compatible, so a drop-in replacement is not possible without PCB changes.

Where can I buy OPA1688?

The OPA1688 is available from authorized distributors such as DigiKey and Mouser. As of 2026-08-26, the OPA1688IDR (SOIC-8) is in stock at DigiKey with pricing starting at $1.85 for single units.

What is the price of OPA1688?

As of 2026-08-26, the OPA1688IDR (SOIC-8) is priced at $1.85 for 1 unit, $1.65 for 10 units, $1.32 for 100 units, $1.12 for 500 units, and $0.95 for 1000 units at DigiKey.

What is the lead time for OPA1688?

The lead time for OPA1688 is typically 1-2 weeks from authorized distributors like DigiKey and Mouser. However, lead times can vary based on stock levels and order quantity. Check distributor websites for real-time availability.

Is OPA1688 in stock?

As of 2026-08-26, the OPA1688IDR (SOIC-8) is in stock at DigiKey and Mouser. The WSON-8 variant (OPA1688IDRGT) may have different availability; check distributor websites for current stock.

What is the best drop-in replacement for OPA1688?

The OPA1688IDRGT (WSON-8) is a drop-in replacement for the OPA1688IDR (SOIC-8) only if the PCB footprint matches. For a pin-compatible alternative, the OPA1688IDR is the same die in a different package. Cross-brand alternatives like the OPA1652 are not pin-compatible.

Can OPA1688 replace OPA2134?

The OPA1688 can functionally replace the OPA2134 in many audio applications, but they are not pin-compatible. The OPA1688 offers lower noise (4.5 nV/√Hz vs 8 nV/√Hz) and higher bandwidth (10 MHz vs 8 MHz), but the OPA2134 has a different pinout, so PCB changes are required.

What are the key specifications of OPA1688 that engineers should know?

The OPA1688 is a dual audio op amp with a supply range of 4.5 V to 36 V, 10 MHz bandwidth, 8 V/µs slew rate, 4.5 nV/√Hz noise, 0.00005% THD+N, ±75 mA output current, and 1.5 mA quiescent current per channel. It is available in SOIC-8 and WSON-8 packages and is specified from -40°C to +85°C.

Engineering reference data for OPA1688 — comparison, design guidance, and compliance information.

Selection Guide

Choose the OPA1688 when you need a low-noise, low-distortion audio op amp with high output current for driving headphones or as a DAC buffer. It is ideal for portable audio devices due to its low quiescent current. If you require even higher output current (e.g., for very low-impedance loads), consider the OPA1622. For applications where lower power consumption is critical and output current is less important, the OPA1652 may be a better fit. The OPA1688IDRGT (WSON-8) is a drop-in replacement if your PCB is designed for that package. All alternatives are from Texas Instruments, ensuring consistent quality and support.

Comparison with Alternatives

Parameter	This Product	OPA1688IDRGT	OPA1652	OPA1622
Package	SOIC-8, WSON-8	WSON-8	SOIC-8	SOIC-8
Brand	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Supply Voltage Range	4.5 V to 36 V	4.5 V to 36 V	4.5 V to 36 V	4.5 V to 36 V
Bandwidth	10 MHz	10 MHz	10 MHz	10 MHz
Slew Rate	8 V/µs	8 V/µs	8 V/µs	8 V/µs
Input Voltage Noise Density	4.5 nV/√Hz	4.5 nV/√Hz	4.5 nV/√Hz	4.5 nV/√Hz
Output Current	±75 mA	±75 mA	±30 mA	±100 mA
Quiescent Current per Channel	1.5 mA	1.5 mA	1.5 mA	1.5 mA

Key Differentiators

Low noise density of 4.5 nV/√Hz (vs OPA1652)
High output current of ±75 mA (vs OPA1652)
Capacitive load stability up to 1000 pF (vs OPA1622)

Design Notes

Ensure proper power supply decoupling. Place 0.1 µF ceramic capacitors as close as possible to the V+ and V- pins. For best performance, use a 10 µF electrolytic capacitor in parallel for low-frequency decoupling. This minimizes power supply noise and prevents oscillation.

Use a solid ground plane under the OPA1688 to reduce noise and parasitic inductance. Keep feedback paths short and direct to minimize stray capacitance. For the WSON-8 package, ensure the exposed pad is soldered to the PCB for proper thermal and electrical connection.

Avoid driving capacitive loads greater than 1000 pF without an isolation resistor. While the OPA1688 is stable with up to 1000 pF, larger loads may cause ringing or oscillation. If driving long cables, add a 10-50 ohm series resistor at the output.