OPA643N/250 Equivalent & Substitute Parts

Part Overview

The OPA643N/250 is a voltage feedback operational amplifier manufactured by Texas Instruments, housed in a SOT-23-5 surface mount package. This device is classified as obsolete and is no longer in active production. The OPA643N/250 delivers a gain bandwidth product of 800 MHz with a slew rate of 1000 V/µs, making it suitable for high-speed signal conditioning applications. Due to its obsolete status, identifying functionally equivalent active alternatives is necessary for design continuity and long-term component availability.

Substiute Parts

OPA643N/250

Texas InstrumentsIn Stock: 2443OPA643N/250 Datasheet

Current PartRFQ

OPA843IDBVT

Texas InstrumentsIn Stock: 1818OPA843IDBVT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the OPA643N/250 is determined by matching the following critical parameters: voltage feedback amplifier topology, single circuit configuration, 800 MHz gain bandwidth product, 1000 V/µs slew rate, SOT-23-5 package compatibility, and surface mount mounting type. The substitute part must maintain electrical performance within the specified operating temperature range of -40°C to 85°C and support the same supply voltage requirements.

The OPA843IDBVT qualifies as a direct substitute based on these criteria. Both devices share identical amplifier type, circuit count, gain bandwidth product, slew rate, package form factor, and operating temperature specifications. The OPA843IDBVT is currently in active production status, ensuring long-term availability and supply chain continuity.

Parameter Comparison

Engineering Selection Recommendations

The OPA843IDBVT is the recommended substitute for the obsolete OPA643N/250. Both devices maintain identical core performance specifications including gain bandwidth product, slew rate, and operating temperature range. The OPA843IDBVT provides superior electrical characteristics in input offset voltage (0.3 mV versus 2.5 mV) and increased output current capability (100 mA versus 60 mA). The substitute part operates across a wider supply voltage range (8 V to 12 V versus 9 V to 11 V), providing greater design flexibility.

The OPA843IDBVT holds active product status with ROHS3 compliance, ensuring regulatory alignment and sustained component availability. The identical SOT-23-5 package and surface mount configuration enable direct board-level substitution without layout modifications. Supply voltage requirements within the OPA643N/250 operating window (9 V to 11 V) fall within the OPA843IDBVT specification range, confirming functional compatibility.

Frequently Asked Questions (FAQ)

Q: Can the OPA843IDBVT be used as a direct replacement for the OPA643N/250 without circuit modifications?

A: Yes. Both devices share identical package geometry (SOT-23-5), pin configuration (SC-74A, SOT-753), and core electrical specifications (800 MHz gain bandwidth product, 1000 V/µs slew rate). The OPA843IDBVT operates within the supply voltage range of the OPA643N/250, enabling direct substitution on existing printed circuit boards.

Q: What are the key differences between these two parts?

A: The OPA843IDBVT provides improved input offset voltage (0.3 mV versus 2.5 mV), higher output current per channel (100 mA versus 60 mA), and operates across a wider supply voltage range (8 V to 12 V versus 9 V to 11 V). The OPA843IDBVT is in active production with ROHS3 compliance, while the OPA643N/250 is obsolete and non-compliant.

Q: Are there any packaging differences between the OPA643N/250 and OPA843IDBVT?

A: Both parts use identical packaging: SOT-23-5 supplier device package with SC-74A and SOT-753 case designations. Surface mount mounting type is consistent across both devices.

Q: What is the supply voltage compatibility between these parts?

A: The OPA643N/250 requires 9 V to 11 V supply voltage. The OPA843IDBVT accepts 8 V to 12 V. Designs operating within the 9 V to 11 V window are fully compatible with both parts.

Q: Does the OPA843IDBVT meet current regulatory requirements?

A: Yes. The OPA843IDBVT is ROHS3 compliant and holds active product status. The OPA643N/250 is RoHS non-compliant and obsolete, making the OPA843IDBVT the appropriate choice for new designs and compliance-driven applications.

Q: What is the operating temperature range for both devices?

A: Both the OPA643N/250 and OPA843IDBVT operate across -40°C to 85°C, ensuring thermal compatibility in equivalent application environments.