Equivalent & Substitute Parts for D45C12

Part Overview

The D45C12 is a PNP bipolar junction transistor manufactured by onsemi, rated for 80 V collector-emitter breakdown voltage and 4 A maximum collector current in a Through Hole TO-220 package. This device is designed for general-purpose switching and amplification applications requiring 30 W power dissipation capability.

The D45C12 carries an Obsolete product status. Locating equivalent or substitute components is necessary to support ongoing system maintenance, repair, and production continuity where original inventory is depleted or unavailable.

Substiute Parts

D45C12

onsemiIn Stock: 1516D45C12 Datasheet

Current PartRFQ

KSB596YTU

onsemiIn Stock: 1752KSB596YTU Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the D45C12 is determined by strict equivalence across the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Transistor polarity: PNP configuration
• Maximum collector current: 4 A or greater
• Collector-emitter breakdown voltage: 80 V or greater
• Maximum power dissipation: 30 W or greater
• Mounting configuration: Through Hole
• Package type: TO-220-3 compatible footprint

The KSB596YTU meets all primary substitution criteria. This part maintains identical electrical ratings for current, voltage, and power while providing improved compliance status and availability. The KSB596YTU is listed as a direct substitute in the D45C12 specification and shares the same base electrical performance envelope required for circuit-level compatibility.

Parameter Comparison

Engineering Selection Recommendations

D45C12 (Obsolete Status)

The D45C12 is classified as Obsolete. This status indicates that the part is no longer manufactured and no further production is planned. Existing inventory may be available through authorized distributors, but long-term supply cannot be assured. The D45C12 carries RoHS non-compliant status, which may restrict use in applications subject to RoHS regulations.

KSB596YTU (Last Time Buy Status)

The KSB596YTU is classified as Last Time Buy, indicating that production will cease after a defined cutoff date. This part is ROHS3 compliant, meeting current environmental and regulatory requirements. The KSB596YTU provides a direct electrical substitute with improved compliance posture and documented availability through the Last Time Buy window.

For new designs and ongoing production support, the KSB596YTU is the appropriate selection. Both parts share identical electrical ratings and TO-220-3 package compatibility, ensuring direct functional substitution at the circuit level.

Frequently Asked Questions (FAQ)

Q: Can the KSB596YTU directly replace the D45C12 in existing circuits?

A: Yes. Both transistors are PNP devices with identical maximum ratings for collector current (4 A), collector-emitter breakdown voltage (80 V), and power dissipation (30 W). The TO-220-3 package footprint is identical, enabling direct pin-for-pin substitution. Circuit operation is maintained within the specified electrical parameters.

Q: What is the difference in DC current gain between these parts?

A: The D45C12 specifies a minimum DC current gain (hFE) of 40 at 200 mA collector current and 1 V collector-emitter voltage. The KSB596YTU specifies a minimum DC current gain of 120 at 500 mA collector current and 5 V collector-emitter voltage. These measurements are taken at different operating points and do not prevent functional substitution. Circuit designers must verify that the application does not depend on the specific hFE value of the D45C12.

Q: Are there compliance differences between the D45C12 and KSB596YTU?

A: Yes. The D45C12 is RoHS non-compliant, while the KSB596YTU is ROHS3 compliant. Both parts are REACH Unaffected and carry the same ECCN classification (EAR99). For applications subject to RoHS regulations, the KSB596YTU is the required selection.

Q: What is the product status difference, and why does it matter?

A: The D45C12 is Obsolete, meaning production has ended and no further manufacturing is planned. The KSB596YTU is Last Time Buy, indicating a defined final production window before manufacturing ceases. For supply chain planning, the KSB596YTU offers a transition path with a known availability window, whereas D45C12 inventory is finite and non-replenishable.

Q: Are the operating temperature ranges compatible?

A: The D45C12 specifies an operating temperature range of -55°C to 150°C. The KSB596YTU specifies a maximum operating temperature of 150°C. Both parts support the upper temperature limit of 150°C. For applications requiring operation below 0°C, the D45C12 specification of -55°C minimum should be verified against the KSB596YTU datasheet for the lower temperature bound.

Q: Can the KSB596YTU be used in high-frequency switching applications?

A: The D45C12 specifies a transition frequency of 40 MHz, while the KSB596YTU specifies 3 MHz. For applications requiring switching speeds above 3 MHz, the frequency difference must be evaluated against circuit timing requirements. The lower transition frequency of the KSB596YTU may introduce additional switching delays in high-speed circuits.