LF347 / TL072 / TL082 / LF353 JFET Op-Amp Cross-Reference: Obsolete to Active Replacements
Find active pin-compatible replacements for obsolete LF347, TL072, TL082, and LF353 JFET-input op-amp order codes. Includes cross-reference table and sourcing guide.
Last updated: June 2026
Bottom Line: The LF347 (quad), LF353 (dual), TL072 (dual low-noise), and TL082 (dual general-purpose) are classic JFET-input op-amps that have accumulated dozens of obsolete, NRND, and manufacturer-discontinued order codes over four decades. Engineers searching for an "LF347 equivalent," "TL084CN equivalent," or "TL072 equivalent" need to match the original pin-out, supply voltage (±5 V to ±18 V), gain-bandwidth product (3–4 MHz), and slew rate (13 V/µs) before committing to a replacement. This guide presents a cross-reference table of obsolete-to-active part numbers, organized by quad and dual configurations, and links directly to in-stock verified listings so you can source a drop-in replacement today.
Why JFET-Input Op-Amps Still Matter
JFET-input operational amplifiers combine the high input impedance of FET front-ends with the drive capability of bipolar output stages. The result is an op-amp that draws less than 0.2 nA of input bias current at room temperature — a critical property for piezoelectric sensors, photodiode transimpedance amplifiers, and sample-and-hold circuits. The LF347, LF353, TL072, and TL082 families established this architecture in the late 1970s and remain specified in millions of schematics, industrial instruments, audio equipment, and medical devices still in production.
Despite their longevity, individual order codes within these families become obsolete or NRND (not recommended for new designs) as fabs retool and packages are discontinued. A designer who specified LF347MX or TL072BCN ten years ago may find those exact codes difficult to source today. The core silicon is still manufactured under active codes by Texas Instruments, STMicroelectronics, and onsemi — the challenge is mapping the old number to the right active replacement.
Understanding the Family Tree
Before reaching for the cross-reference table, it helps to understand how the four families relate to each other. The LF347 and TL084 are quad (four amplifier) devices in 14-pin DIP or SOIC packages. The LF353, TL072, and TL082 are dual (two amplifier) devices in 8-pin DIP or SOIC packages. All share the same basic JFET front-end topology, ±18 V maximum supply, and an internal 30 pF compensation capacitor.
The primary electrical differences are in input noise and offset voltage grade:
- TL072 / LF353 – low-noise variant; input voltage noise typically 18 nV/√Hz; tighter offset voltage specs (A/B suffix).
- TL082 / LF347 – standard-noise variant; input voltage noise typically 18–25 nV/√Hz; wider offset voltage tolerance.
- TL084 – quad counterpart to the TL082; pin-compatible with LF347.
In practice, TL072 and TL082 are electrically interchangeable in most audio and sensor applications; the difference is subtle enough that TI's datasheet cross-references them as compatible family members.
Obsolete-to-Active Cross-Reference Table
The table below lists common obsolete or NRND codes alongside their active direct replacements. "Active" means the replacement is in current production, has active TI/ST lifecycle status, and can be sourced through distribution channels today.
Quad Devices (14-Pin, LF347 / TL084 Family)
| Obsolete / NRND Code | Active Replacement | Manufacturer | Package | Notes |
|---|---|---|---|---|
| LF347MX | LF347M | Texas Instruments | SOIC-14 | Identical die; MX suffix was tape-and-reel designation |
| LF347MX/NOPB | LF347M | Texas Instruments | SOIC-14 | Pb-free version now standard |
| LF347N (non-E4) | LF347BD | Texas Instruments | SOIC-14 | BD = wide-temp, slight upgrade |
| TL084CN | LF347BD | Texas Instruments | SOIC-14 | TL084 pin-compatible with LF347 |
| TL084ACN | LF347M | Texas Instruments | SOIC-14 | A-suffix tighter Vos; LF347M equivalent |
| TL064CN | LF347BD | Texas Instruments | SOIC-14 | Low-power quad; verify Icc budget |
Dual Devices (8-Pin, LF353 / TL072 / TL082 Family)
| Obsolete / NRND Code | Active Replacement | Manufacturer | Package | Notes |
|---|---|---|---|---|
| LF353N (commercial) | LF353N | Texas Instruments | DIP-8 | Still active; verify distributor stock freshness |
| LF353P | LF353N | Texas Instruments | DIP-8 | P suffix = plastic DIP, same as N |
| LF353MX | LF353M/NOPB | Texas Instruments | SOIC-8 | MX was T&R; /NOPB replaces it |
| TL072BCN | TL072CN | STMicroelectronics | DIP-8 | C suffix = commercial temp; B = tighter Vos |
| TL072ACPE | TL072CN | STMicroelectronics | DIP-8 | AC = tighter; CN is closest active DIP code |
| TL082CN | TL082ACD | Texas Instruments | SOIC-8 | ACD = A-grade, SOIC; CN = DIP obsolete |
| TL082CP | TL082ACD | Texas Instruments | SOIC-8 | CP = commercial DIP; migrate to SOIC |
| TL072CPSR | TL072CN | STMicroelectronics | DIP-8 | CPSR = SOP; CN is drop-in for DIP boards |
Package caution: DIP-to-SOIC migrations require a PCB adapter or layout spin. Verify pad pitch before ordering samples.
Key Selection Parameters
1. Number of Amplifiers: Quad vs. Dual
The first decision is channel count. If your circuit requires four independent op-amp stages — a quad instrumentation front-end, a 4-channel audio mixer, or a multi-pole active filter — the LF347 family (14-pin SOIC or DIP) is the natural choice. If you need two channels, the LF353, TL072, and TL082 families all share the same 8-pin pinout and are directly interchangeable at the PCB level. Do not mix a quad replacement into a dual footprint — the pin assignments differ completely.
2. Input Bias Current
JFET-input op-amps deliver input bias currents in the 10–200 pA range at 25 °C, compared to 10–100 nA for bipolar-input devices like the LM358. For applications with source impedances above 100 kΩ — pH electrodes, piezo sensors, or photodiodes — this difference is decisive. The LF347 and LF353 specify a maximum bias current of 0.2 nA (200 pA); the TL072 specifies 65 pA typical. At elevated temperatures, JFET bias current doubles approximately every 10 °C, so check the full temperature curve when designing for 85 °C+ environments.
3. Gain-Bandwidth Product (GBW) and Slew Rate
All four families target a 3–4 MHz unity-gain bandwidth and a 13 V/µs slew rate, making them broadly interchangeable for audio (20 Hz–20 kHz), industrial sensors (DC–10 kHz), and general-purpose amplification. Engineers who need higher speed should evaluate the OPA2134 (8 MHz, 20 V/µs) or LM4562 (55 MHz) rather than staying within this family. The GBW and slew rate of TI's active LF347BD and LF347M parts match the original LF347 specification exactly.
4. Supply Voltage Range
The LF347, LF353, TL072, and TL082 all operate on dual supplies from ±5 V to ±18 V (36 V single supply). This range covers the vast majority of legacy ±12 V and ±15 V analog designs. If your system has migrated to ±5 V or 3.3 V single-supply rails, consider rail-to-rail alternatives such as the TLV2372 or MCP6002 rather than forcing a high-voltage JFET into a low-voltage application.
5. Input Offset Voltage and Grade Suffixes
Offset voltage grades follow a consistent naming convention across manufacturers: no suffix or "C" = commercial (typical Vos 3–13 mV), "A" suffix = tighter grade (Vos max 3–6 mV), "B" suffix = precision grade (Vos max 1–3 mV). When replacing a "B"-grade part with a "C"-grade, calculate whether the additional offset creates an unacceptable DC error at the output. A TL072BCN (B-grade, 2 mV max) is a stricter spec than a TL072CN (6 mV max); replacing down-grade in a precision application requires an offset null or trimmer update.
6. Package and Thermal Considerations
Legacy designs often used DIP-8 or DIP-14 packages (2.54 mm pitch through-hole). Active replacements in SOIC-8 or SOIC-14 have the same electrical specs but require SMD pads. For prototyping or repair, DIP-to-SOIC adapters are available for under $1. The SOIC package also offers slightly better thermal dissipation in high-density boards. Maximum power dissipation for SOIC-8 is typically 625 mW at 25 °C — adequate for all standard ±15 V, 1-op-amp-per-package applications.
7. Manufacturer and Lifecycle Status
TI currently maintains active (not NRND) status on LF347BD, LF347M, LF347M/NOPB, TL072CN, TL072CP, TL082ACD, LF353N, and LF353N/NOPB. STMicroelectronics actively ships LF347DT, TL072CD, TL072CN, and LF353DT in SOIC packages. If lifecycle assurance matters — medical, industrial, or defense — request a product longevity statement from the manufacturer or work through an authorized distributor.
Recommended Products Comparison Table
| Product | Config | GBW | Slew Rate | Package | Best For |
|---|---|---|---|---|---|
| LF347BD | Quad | 4 MHz | 13 V/µs | SOIC-14 | Drop-in LF347 / TL084 SOIC replacement |
| LF347M | Quad | 4 MHz | 13 V/µs | SOIC-14 | Precision quad; tighter Vos grade |
| TL072CN | Dual | 3 MHz | 13 V/µs | DIP-8 | Low-noise audio; direct TL072BCN replacement |
| TL082ACD | Dual | 3 MHz | 13 V/µs | SOIC-8 | General-purpose dual; TL082CN/CP SOIC upgrade |
| LF353N | Dual | 4 MHz | 13 V/µs | DIP-8 | Direct LF353P / LF353N DIP-8 in-stock option |
All five parts are verifiable on FindMyChip from 200+ authorized distributors. Use /search to compare current pricing and lead times across multiple suppliers, or submit a BOM to /quote for bulk pricing on multiple line items.
Selection Decision Flowchart
Use this decision tree when choosing a replacement:
- How many op-amp channels do you need in this package?
- 4 channels → go to Step 2A (Quad path)
- 2 channels → go to Step 2B (Dual path)
2A. Quad path — Do you need SOIC or DIP?
- SOIC → LF347BD (commercial) or LF347M (tighter Vos)
- DIP → LF347BN (verify stock) or use a DIP-14 socket with LF347BD adapter
2B. Dual path — Is input noise critical (audio, instrumentation)?
Do you need a specific offset voltage grade (A or B)?
- Yes → Verify the replacement suffix matches; do not substitute a C-grade for a B-grade without recalculating DC error
- No → any C-grade active code is acceptable
Is lead-free (RoHS) required?
- Yes → prefer /NOPB suffix from TI or verify ST part is Pb-free
- No → standard commercial suffix is fine
FAQ
Q: Is the TL072 a drop-in replacement for the LF353?
Yes, the TL072 and LF353 share the same 8-pin DIP and SOIC footprint and are electrically interchangeable in the vast majority of applications. Both deliver 3–4 MHz GBW, 13 V/µs slew rate, and operate from ±5 V to ±18 V. The TL072 specifies slightly lower input noise (18 nV/√Hz) than the LF353 (25 nV/√Hz typical), making it the preferred choice for audio preamplifiers. You can swap one for the other without PCB changes on any standard 8-pin JFET op-amp footprint.
Q: What is the TL084CN equivalent for active sourcing?
The TL084CN is a quad JFET-input op-amp in a 14-pin DIP package that is widely listed as NRND. Its direct active equivalent is the LF347BD (SOIC-14) from Texas Instruments. If a DIP-14 form factor is required, LF347BN is occasionally available but may have limited stock depth. For SOIC designs, LF347BD and LF347M are the recommended paths. STMicroelectronics also offers the LF347DT in SOIC-14, providing a second-source option.
Q: Can I use a TL072 in place of a TL082?
Yes. The TL072 and TL082 are pin-compatible in DIP-8 and SOIC-8 and differ only in offset voltage grade and noise specification. A TL072 substituted for a TL082 will perform as well or better in noise-sensitive circuits. The reverse substitution (TL082 for TL072) is acceptable in non-noise-critical applications. Always verify the offset voltage grade if the circuit relies on precision DC behavior.
Q: Why are so many LF347 and TL072 codes marked obsolete?
Semiconductor manufacturers periodically discontinue specific package variants, temperature grades, and tape-and-reel configurations as demand shifts. A part code like TL072BCPE may be discontinued simply because the commercial DIP market has migrated to SOIC, not because the underlying circuit is obsolete. The active replacements maintain identical silicon; only the package designation or suffix has changed. Checking lifecycle status in the manufacturer's product selector before designing in any part avoids this problem.
Q: How do I find verified in-stock quantities for LF347 family parts?
FindMyChip aggregates real-time inventory from 200+ verified distributors and applies a 5-point authentication process to screen out counterfeits. Enter the full MPN (e.g. LF347BD, TL072CN) in the /search bar to see cross-distributor pricing and lead times. For quantities above 500 units or consolidated BOM sourcing, submit a request via /quote and receive a competitive quote within 24 hours.
Conclusion
The LF347, LF353, TL072, and TL082 families remain fully supported by Texas Instruments and STMicroelectronics through a smaller set of actively produced order codes. Engineers encountering obsolete codes can use the cross-reference table in this guide to identify a verified direct replacement: LF347BD or LF347M for quad SOIC designs, TL072CN or LF353N for dual DIP low-noise applications, and TL082ACD for dual SOIC general-purpose circuits.
Before committing to a replacement, verify the offset voltage grade, confirm the package footprint, and check the RoHS status. Then search FindMyChip to compare in-stock pricing across 200+ verified distributors, or submit your full BOM to /quote for a consolidated competitive quote. FindMyChip's 5-point authentication and 24-hour response time make it a reliable source for both prototype quantities and production runs on classic analog ICs.