OPA2322 Equivalent, Alternative & Replacement Guide | ICMASS

OPA2322 vs MCP6022 vs TLV2372: Full Comparison

The comparison in one paragraph: OPA2322 is the speed king with the best offset; MCP6022 keeps the RRIO and drops to 10MHz for lower cost plus automotive qualification; TLV2372 trades speed for a 16V rail and a real shutdown pin.

The pin map is identical across all three — the electrical check is where the decision lives.

When to Use the MCP6022

Choose MCP6022 when 10MHz is enough and you want Microchip availability, PDIP for breadboarding, or AEC-Q100 automotive grade. The 8.7nV/√Hz noise figure beats the TLV2372, and the 1mA quiescent is a third less than the OPA2322.

The one thing it won't do: 20MHz of gain-bandwidth. If your filter or ADC driver is sized against the OPA2322's full 20MHz, verify the loop gain at your operating frequency before swapping.

When to Use the TLV2372

Choose TLV2372 when the supply rail exceeds 5.5V — 12V, ±5V, automotive battery rails — or when a shutdown mode saves battery. The 2.7V–16V range is the biggest practical difference between these three parts; the OPA2322 is hard-limited at 6V absolute maximum.

The trade: 3MHz GBW and 4.5mV max offset. Fine for signal conditioning, wrong for precision DC or fast filter edges.

When NOT to Use This Class at All

Don't swap this CMOS RRIO class in when the real need is micro-power, precision, or a comparator. For always-on battery sensing, the TLV9002 (1MHz, 2µA) is the right class — these three parts burn 0.55–1.5mA per channel.

For mV-level precision, the 2mV–4.5mV offsets are too big; a chopper family like the OPA2317 is the right tool. And none of them are comparators — that's the LMV393's job.

Pinout & Layout Notes

All three parts share the standard 8-pin dual op-amp map: pin 1 OUTA, pin 2 −INA, pin 3 +INA, pin 4 V−, pin 5 +INB, pin 6 −INB, pin 7 OUTB, pin 8 V+. That's the good news for any swap.

The bad news is the footprint. The OPA2322's VSSOP-8 uses a 0.65mm pin pitch on a 3.0mm body; a SOIC-8 uses 1.27mm pitch on a ~5.0mm body. Same pin functions, different land pattern — a swap between packages is a board change, not a pick-and-place edit.

Other Alternatives Worth Knowing

Same-family, same socket: the OPA2322AID is the same 20MHz die in SOIC-8 — the direct swap when the board footprint is SOIC. The OPA322 (single) and OPA4322 (quad) keep the same silicon for different channel counts.

The micro-power escape hatch: the TLV9002 runs the same 1.8V–5.5V rail with rail-to-rail I/O at 1MHz and 2µA — for always-on sensing it's a different universe of battery life, at the cost of 20× the GBW.

The cost king: the LM358 class runs 3V–32V and costs pennies, but it's bipolar (nA–µA input bias) and 1MHz. For a high-impedance source, the pA input of the CMOS parts is the difference between a working divider and a rail-clipped output.

Frequently Asked Questions

Q1: What is a direct replacement for the OPA2322?

A: The OPA2322AID — the same 20MHz die in SOIC-8 — is the only exact-spec swap, and it needs an SOIC footprint. In the same VSSOP-8 footprint, the closest pin-compatible candidates are the MCP6022 (10MHz) and TLV2372 (3MHz, 16V rail). Same pin map, different electrical envelope — check supply, GBW, and stability before the swap.

Q2: Can I replace OPA2322 with MCP6022?

A: Yes, electrically and mechanically — if 10MHz is enough for your circuit. Both are CMOS RRIO duals on the standard 8-pin map. The MCP6022 adds AEC-Q100 automotive grade and costs less, but its supply starts at 2.5V (not 1.8V) and the GBW is half. Verify loop gain at your operating frequency.

Q3: What should I check first when swapping an op amp?

A: In this order: package and pinout, absolute-max supply, input type and bias current, then GBW and slew rate, then quiescent current and stability. That's the order real forums converge on — a part that passes pins and supply but fails input bias will rail your output on a high-impedance circuit.

Q4: Can a faster op amp cause problems?

A: Yes — a much faster replacement can oscillate or ring where the original was stable. More gain-bandwidth means less phase margin at high frequencies, especially with capacitive loads. Forum reports of swaps that "fixed" noise but started oscillation are common; check on a scope, not on paper.

Q5: I need to run from a 12V rail — which replacement?

A: TLV2372 — the only one of the three that survives above 5.5V. Its 2.7V–16V range covers 12V and ±5V rails; the OPA2322 is hard-limited at 6V absolute maximum. You give up speed (3MHz) and offset precision (4.5mV max) to get there.

Q6: Are the pinouts the same across OPA2322, MCP6022, and TLV2372?

A: Yes — all three use the standard 8-pin dual map (1 OUTA, 2 −INA, 3 +INA, 4 V−, 5 +INB, 6 −INB, 7 OUTB, 8 V+). The schematic doesn't change. But the packages differ: VSSOP-8 at 0.65mm pitch vs SOIC-8 at 1.27mm — the PCB land pattern must match the package you choose.

Q7: Where can I buy OPA2322 replacements?

A: Contact ICMASS — we stock the OPA2322 family and can cross-reference MCP6022 and TLV2372 equivalents for your quantity. Same-day quotes, volume pricing on request.