KF353 Equivalent & Substitute Parts

Part Overview

The KF353 is a J-FET operational amplifier featuring two circuits in an 8-DIP package, manufactured by onsemi. This device is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and procurement. The KF353 delivers a 4 MHz gain bandwidth product with a 13V/µs slew rate, making it suitable for applications requiring low input bias current and low input offset voltage characteristics inherent to J-FET amplifier designs.

Substiute Parts

KF353

onsemiIn Stock: 1407KF353 Datasheet

Current PartRFQ

LF353N/NOPB

Texas InstrumentsIn Stock: 7381LF353N/NOPB Datasheet

DirectRFQ

LF353P

Texas InstrumentsIn Stock: 5963LF353P Datasheet

DirectRFQ

OPA2107AP

Texas InstrumentsIn Stock: 4856OPA2107AP Datasheet

SimilarRFQ

TL082CP/NOPB

Texas InstrumentsIn Stock: 967TL082CP/NOPB Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the KF353 is determined by the following critical parameters:

Primary Substitution Criteria:

• Amplifier Type: J-FET (maintains input impedance and bias current characteristics)
• Number of Circuits: 2 (dual-channel configuration)
• Package / Case: 8-DIP (0.300", 7.62mm) (physical and electrical pin compatibility)
• Mounting Type: Through Hole (PCB assembly compatibility)

Secondary Compatibility Parameters:

• Slew Rate: 13V/µs (signal fidelity and transient response)
• Gain Bandwidth Product: 4 MHz (frequency response envelope)
• Current - Input Bias: 50 pA (input loading characteristics)
• Voltage - Input Offset: 5 mV (DC accuracy)
• Current - Supply: 3.6 mA (power consumption profile)
• Voltage - Supply Span: 36 V (power supply compatibility)
• Operating Temperature: 0°C ~ 70°C (thermal operating range)

Substitute parts are classified as Direct when all primary and secondary parameters match the KF353 specification. Parts classified as Similar may exhibit variations in secondary parameters while maintaining primary substitution criteria, requiring application-level verification of performance impact.

Parameter Comparison

Engineering Selection Recommendations

Direct Substitutes (Recommended for Replacement):

The LF353N/NOPB and LF353P manufactured by Texas Instruments are direct functional equivalents to the KF353. Both devices maintain identical J-FET amplifier architecture, dual-circuit configuration, and core electrical parameters including 13V/µs slew rate, 4 MHz gain bandwidth product, 50 pA input bias current, and 5 mV input offset voltage. Both parts are Active products with ROHS3 compliance, ensuring long-term availability and regulatory alignment. The LF353N/NOPB operates across a 10V to 36V supply range, while the LF353P operates from 7V to 36V, both accommodating the KF353's 36V supply specification. Pin-for-pin compatibility and identical 8-DIP packaging enable direct PCB substitution without design modification.

Similar Substitute (Conditional Application):

The TL082CP/NOPB is a J-FET amplifier with identical primary substitution parameters and Active product status. It maintains 13V/µs slew rate, 4 MHz gain bandwidth product, 50 pA input bias current, and 5 mV input offset voltage. However, the TL082CP/NOPB specifies a fixed 36V supply span (minimum and maximum both 36V), whereas the KF353 also specifies 36V. This part is suitable for applications with fixed 36V supply rails. ROHS3 compliance and Active status support long-term procurement.

Alternative Consideration (Performance Enhancement):

The OPA2107AP is classified as a General Purpose amplifier rather than J-FET type, with superior input bias current (4 pA versus 50 pA) and input offset voltage (100 µV versus 5 mV). It delivers higher slew rate (18V/µs) and gain bandwidth product (4.5 MHz). However, OPA2107AP is Obsolete, limiting future availability. This part is suitable only for applications where enhanced DC precision and transient response justify the obsolescence risk and where the broader operating temperature range (-25°C to 85°C) provides value.

Frequently Asked Questions (FAQ)

Q: Can the LF353N/NOPB directly replace the KF353 without PCB modification?

A: Yes. The LF353N/NOPB is pin-for-pin compatible with the KF353, sharing identical 8-DIP package geometry, pinout, and electrical interface. No PCB layout changes are required. Both devices are J-FET amplifiers with matching slew rate, gain bandwidth product, input bias current, and input offset voltage specifications.

Q: What is the difference between the LF353N/NOPB and LF353P?

A: Both are J-FET dual-channel amplifiers with identical core performance parameters. The primary difference is supply voltage range: LF353N/NOPB operates from 10V to 36V, while LF353P operates from 7V to 36V. For applications using the KF353's 36V supply specification, both parts are functionally equivalent. The LF353P offers greater flexibility for lower-voltage applications.

Q: Why is the OPA2107AP listed as a substitute if it is Obsolete?

A: The OPA2107AP is included because it meets the primary substitution criteria of dual J-FET amplifier in 8-DIP package with compatible pinout and electrical interface. However, its Obsolete status means future procurement may be constrained. It is suitable only for applications where current inventory is available and where the enhanced performance characteristics (lower input bias current, lower input offset voltage, higher slew rate) justify the obsolescence risk.

Q: Does the TL082CP/NOPB have any supply voltage limitations compared to the KF353?

A: The TL082CP/NOPB specifies a fixed 36V supply span (both minimum and maximum are 36V), whereas the KF353 also specifies 36V. For applications operating at exactly 36V, the TL082CP/NOPB is fully compatible. For applications requiring supply voltage flexibility, the LF353N/NOPB or LF353P offer broader supply ranges while maintaining the same core performance.

Q: Are all substitute parts RoHS compliant?

A: The LF353N/NOPB, LF353P, and TL082CP/NOPB are all ROHS3 compliant, meeting current environmental and regulatory requirements. The OPA2107AP is also ROHS3 compliant. The original KF353 does not specify RoHS status. For applications requiring RoHS compliance documentation, the Texas Instruments substitutes provide certified compliance.

Q: What is the impact of the LF353P's lower gain bandwidth product (3 MHz versus 4 MHz)?

A: The LF353P specifies 3 MHz gain bandwidth product compared to the KF353's 4 MHz. This represents a 25% reduction in frequency response envelope. For applications where the full 4 MHz bandwidth is critical, the LF353N/NOPB or TL082CP/NOPB maintain the 4 MHz specification. For applications with lower frequency requirements, the LF353P is suitable.

Q: Can these parts be used in applications requiring extended temperature ranges beyond 0°C to 70°C?

A: The KF353, LF353N/NOPB, LF353P, and TL082CP/NOPB all specify 0°C to 70°C operating temperature range. The OPA2107AP extends this to -25°C to 85°C. For applications requiring extended temperature operation, only the OPA2107AP qualifies, though its Obsolete status must be considered.

Q: Is the 8-DIP package still widely available for through-hole assembly?

A: Yes. All substitute parts are available in 8-DIP through-hole package. The LF353N/NOPB and LF353P have substantial current inventory (7310 and 5879 units respectively), ensuring availability for new designs and production runs. The TL082CP/NOPB has lower inventory (911 units). Through-hole assembly remains standard for legacy and new applications requiring this package format.