OPA627BP - 16MHz Precision Difet Op-Amp | Texas Instruments
MPN: OPA627BP ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $29.5 | $29.50 |
| 10 | $27.1 | $271.00 |
| 100 | $24.8 | $2,480.00 |
| 500 | $22.9 | $11,450.00 |
| 1,000 | $21.3 | $21,300.00 |
OPA627BP Overview
A precision operational amplifier is an op-amp engineered to minimize DC error terms - input offset voltage, bias current, and drift - while maintaining usable AC performance. Within the signal-chain hierarchy, it sits between general-purpose amplifiers and instrumentation amplifiers, and the OPA627 belongs to TI's (originally Burr-Brown) Difet family, where dielectric isolation of JFETs dramatically reduces input capacitance and leakage compared to conventional junction-isolated processes.
Key differentiating features include the combination of high speed (16 MHz, 55 V/us) with true precision DC accuracy, JFET input for extremely low bias current, and industrial temperature grade options. The 'B' grade suffix denotes tighter offset and drift limits; the 'P' suffix denotes the plastic 8-pin DIP package.
Architecturally, the Difet process places a dielectric layer around FET structures, yielding low input capacitance and low input bias current that remain stable over temperature. This is why the OPA627 achieves sub-microvolt-per-degree drift together with wideband dynamics - a combination rarely met by CMOS or bipolar alternatives of its era.
Typical applications include high-fidelity audio preamplifiers and headphone amplifiers, precision integrators and photodiode transimpedance stages, active filters, and data-acquisition front ends where both DC accuracy and 16 MHz bandwidth are required.
Design consideration: to preserve stability, follow the datasheet layout guidance - keep feedback resistance values moderate and decouple supplies close to pins 4 and 7; the decompensated sibling OPA637 (minimum stable gain of 5) is not a unity-gain-stable substitute.
This page synthesizes distributor pricing, drop-in alternative analysis, and practical design notes not consolidated in the manufacturer datasheet, with prices as of 2026-09-13.
Drop-in alternatives for OPA627BP — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with OPA627BP (same form factor and footprint) — differing in Package, Supply Voltage Range, Amplifier Type, Slew Rate, RoHS Status.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
OPA627AP
✅ Drop-In📋 Reference alternative (not in catalog)
OPA637BP
✅ Drop-In✓ In Stock
$11.8 / Unit
View Datasheet →OPA627AU
✅ Drop-In✓ In Stock
$12.1 / Unit
View Datasheet →OPA602BP
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$4.05 / Unit
View Datasheet →OPA627BP Maximum Ratings & Electrical Characteristics
| Amplifier Type | Precision High-Speed Difet Operational Amplifier |
| Number of Channels | 1 |
| Gain Bandwidth Product | 16 MHz |
| Slew Rate | 55 V/us |
| Offset Drift | 0.8 uV/C max |
| Supply Voltage Range | ±4.5 V to ±18 V (9 V to 36 V total) |
| Package | 8-Pin PDIP (P) |
| Mounting Type | Through Hole |
| Input Type | JFET (Difet process) |
| Product Family | OPA6x7 (OPA627 / OPA637) |
OPA627BP Pin Configuration
| Pin 1 | TRIM A — Offset trim terminal A (potentiometer to V+) |
| Pin 2 | -IN — Inverting input |
| Pin 3 | +IN — Non-inverting input |
| Pin 4 | V- — Negative supply |
| Pin 5 | NC — Not connected (per datasheet) |
| Pin 6 | OUT — Output |
| Pin 7 | V+ — Positive supply |
| Pin 8 | TRIM B — Offset trim terminal B (potentiometer to V-) |
Typical Applications
OPA627BP is suitable for 6 applications: High-Fidelity Audio Preamplifiers, Photodiode Transimpedance Amplifiers, Precision Integrators and Sample-Hold Front Ends, Active Filter Stages, Data Acquisition Front Ends, Test and Measurement Instrumentation.
High-Fidelity Audio Preamplifiers
The OPA627BP fits hi-fi preamplifier and line-stage roles because its JFET Difet input draws negligible bias current from high-impedance volume potentiometers and coupling networks, while 16 MHz bandwidth and 55 V/us slew rate keep large audio transients free of slew-induced distortion. In a typical non-inverting stage with gain of 2 to 10, feedback resistors of 1 k ohm to 10 k ohm keep Johnson noise low and preserve bandwidth. The 0.8 uV/C drift class matters little in AC-coupled audio but confirms tight initial offset for direct-coupled designs. Community designs such as AMB headphone amplifiers on diyAudio use the OPA627 in exactly this role.
Recommended
Photodiode Transimpedance Amplifiers
Photodiode front ends demand picoampere-class input current, which the Difet JFET input of the OPA627BP provides, so total error is set by diode leakage rather than amplifier bias. The 16 MHz gain-bandwidth product supports fast transimpedance stages with feedback resistors from 100 k ohm to 1 M ohm, while the precision drift class keeps the DC operating point stable across temperature. TI datasheet guidance calls for a small feedback capacitor to set the noise-gain crossover safely below the amplifier bandwidth. The trade-off versus CMOS-input parts is higher supply current, accepted here for lower noise and wider bandwidth.
Recommended
Precision Integrators and Sample-Hold Front Ends
Integrators amplify input offset by the closed-loop DC gain, so the OPA627BP's 0.8 uV/C maximum drift and tight B-grade offset directly reduce output ramp error over time. The JFET input's low bias current prevents slow charging of the integration capacitor, a classic failure mode with bipolar op-amps. With ±15V supplies, the ±4.5V to ±18V rated range provides generous swing headroom for driving the integrator output across a wide measurement span. The 16 MHz bandwidth keeps loop dynamics fast at moderate integrator time constants, supporting data-acquisition and control-loop calibration circuits.
Recommended
Active Filter Stages
Multiple-feedback and Sallen-Key active filters benefit from the OPA627BP's combination of 16 MHz bandwidth and precision DC behavior: the amplifier's excess bandwidth keeps the actual corner frequency close to the calculated value even for filters in the hundreds of kilohertz, while low offset keeps filter passband DC shift small. The unity-gain stability of the OPA627 allows standard Sallen-Key unity-gain topologies without stability analysis, unlike the decompensated OPA637BP which requires gain >= 5. Choose 1% or better resistors and NP0/C0G capacitors to preserve the filter accuracy the amplifier permits.
Recommended
Data Acquisition Front Ends
As a buffer or gain stage ahead of an ADC, the OPA627BP contributes low drift and low bias current while providing 55 V/us slewing for fast full-scale signal steps. With ±4.5V to ±18V supply range it matches ±15V industrial analog rails, and its output drives moderate capacitive loads typical of ADC input networks when a small series isolation resistor is used. In multiplexed acquisition systems, the fast settling of the Difet architecture minimizes channel-to-channel crosstalk after mux switching. The precision B-grade limits calibration frequency in systems spanning temperature.
Recommended
Test and Measurement Instrumentation
Bench instruments, signal generators, and measurement front ends use the OPA627BP where both precision DC and megahertz-class AC response are required in one amplifier - for example, summing nodes in function generators or guard buffers in high-impedance probes. The ±18V maximum supply allows signal swings beyond most single-supply modern op-amps, important for instruments handling ±10V industrial signals. The 0.8 uV/C drift class keeps zero readings stable over warm-up, and unity-gain stability simplifies buffer designs. Its DIP-8 package also suits prototyping and socketed instrument repair.
Recommended
Recommended Products Summary
Engineering reference data for OPA627BP — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | OPA627AP | OPA637BP | OPA602BP |
|---|---|---|---|---|
| Package | 8-Pin PDIP | 8-Pin PDIP - same | 8-Pin PDIP - same | 8-Pin PDIP - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Unity-Gain Stable | Yes | Yes | No - min gain 5 | Yes |
Key Differentiators
- Unity-gain stability with 16 MHz bandwidth (vs OPA637BP)
- Tighter B-grade precision (vs OPA627AP)
- Difet JFET input with dielectric isolation (vs OPA602BP)
Design Notes
Decouple pins 4 and 7 with 0.1 uF ceramic capacitors placed within a few millimeters of the DIP-8 pins, plus 4.7 uF to 10 uF bulk per supply rail. Keep the feedback path from pin 6 to pin 2 short and away from the inputs to limit stray capacitance at -IN; with 16 MHz of bandwidth, even a few picofarads of trace capacitance can erode phase margin in low-gain stages.
Do not substitute OPA637BP for OPA627BP in unity-gain or low-gain circuits: OPA637 is decompensated and requires a minimum closed-loop gain of 5, otherwise it will oscillate. Also, if using the offset-trim pins 1 and 8, connect the trim potentiometer wiper to the correct trim supply per the datasheet; leaving pins 1 and 8 floating is acceptable when no trim is required.
The JFET input permits large feedback and source resistors without bias-current error, but very large resistors (over 100 k ohm) combined with input capacitance add a pole that can destabilize the loop. Estimated guideline: keep the equivalent feedback network impedance moderate or add a small capacitor (a few pF, value set by noise-gain analysis) across the feedback resistor to compensate.
Compliance Information
Compliance status not explicitly stated in the retrieved web data; verify on ti.com/product/OPA627.
