MCH6545-TL-E Equivalent & Substitute Parts

Part Overview

The MCH6545-TL-E is a Bipolar (BJT) Transistor Array featuring integrated NPN and PNP transistors in a 6-MCPH surface mount package. This device is rated for 50V collector-emitter breakdown voltage with a maximum collector current of 500mA and 550mW power dissipation. The MCH6545-TL-E is classified as obsolete product status. Identification of equivalent and substitute parts is necessary to support ongoing design requirements, production continuity, and system maintenance where this component is specified.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN, PNP	—
Current - Collector (Ic) (Max)	500	mA
Voltage - Collector Emitter Breakdown (Max)	50	V
Vce Saturation (Max)	100	mV
Power - Max	550	mW
Frequency - Transition	500	MHz
Operating Temperature (TJ)	150	°C
Mounting Type	Surface Mount	—
Package / Case	6-SMD, Flat Leads	—
Supplier Device Package	6-MCPH	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the MCH6545-TL-E is determined by compatibility across the following critical parameters:

Package Compatibility: Both the main part and substitute must utilize the 6-MCPH surface mount package with 6-SMD flat leads to ensure mechanical and electrical fit on printed circuit boards.

Transistor Configuration: Both devices must contain integrated NPN and PNP transistor arrays to maintain functional equivalence in dual-polarity switching and amplification applications.

Electrical Ratings: Substitute parts must meet or exceed the voltage and current requirements of the application. The MCH6545-TL-E specifies 50V collector-emitter breakdown voltage and 500mA maximum collector current. Substitutes with lower voltage ratings (such as 30V) are suitable only for applications operating below the substitute's rated voltage.

Power Dissipation: Maximum power rating of 550mW must be maintained or exceeded in substitute selections.

Thermal and Environmental Compliance: Operating temperature range of 150°C (TJ), RoHS3 compliance, MSL rating of 1, and REACH unaffected status must be preserved.

Frequency Performance: Transition frequency of 500MHz or higher ensures compatibility with high-speed switching applications.

The MCH6541-TL-E qualifies as a substitute based on these parameters, with the exception of reduced voltage rating (30V versus 50V) and increased collector current capability (700mA versus 500mA).

Parameter Comparison

Parameter	MCH6545-TL-E (Main)	MCH6541-TL-E (Substitute)	Notes
Manufacturer	onsemi	onsemi	Same manufacturer
Category	Transistors, Bipolar (BJT)	Transistors, Bipolar (BJT)	Identical category
Transistor Type	NPN, PNP	NPN, PNP	Identical configuration
Current - Collector (Ic) (Max)	500 mA	700 mA	Substitute rated higher
Voltage - Collector Emitter Breakdown (Max)	50 V	30 V	Substitute rated lower
Vce Saturation (Max)	100 mV @ 10mA, 100mA	190 mV @ 10mA, 200mA / 220 mV @ 10mA, 200mA	Substitute exhibits higher saturation voltage
Current - Collector Cutoff (Max)	100 nA (ICBO)	100 nA (ICBO)	Identical leakage current
DC Current Gain (hFE) (Min)	300 @ 10mA, 2V	300 @ 50mA, 2V / 200 @ 10mA, 2V	Comparable gain characteristics
Power - Max	550 mW	550 mW	Identical power rating
Frequency - Transition	500 MHz	540 MHz, 520 MHz	Substitute meets or exceeds frequency
Operating Temperature (TJ)	150 °C	150 °C	Identical temperature rating
Mounting Type	Surface Mount	Surface Mount	Identical mounting
Package / Case	6-SMD, Flat Leads	6-SMD, Flat Leads	Identical package
Supplier Device Package	6-MCPH	6-MCPH	Identical supplier package
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical compliance
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Identical MSL rating
REACH Status	REACH Unaffected	REACH Unaffected	Identical regulatory status
Product Status	Obsolete	Active	Substitute is actively manufactured

Engineering Selection Recommendations

Product Status Consideration: The MCH6545-TL-E is classified as obsolete, indicating discontinued manufacturing and limited availability. The MCH6541-TL-E is classified as active product status, ensuring ongoing supply and manufacturing support.

Regulatory and Compliance Alignment: Both devices maintain ROHS3 compliance, REACH unaffected status, and identical MSL ratings of 1 (Unlimited). This ensures equivalent environmental and regulatory qualification for applications requiring these certifications.

Voltage Rating Application Scope: The MCH6541-TL-E substitute operates at a maximum collector-emitter breakdown voltage of 30V, compared to the MCH6545-TL-E rating of 50V. Selection of the MCH6541-TL-E is appropriate for applications with circuit operating voltages not exceeding 30V. Applications requiring 50V operation must retain the MCH6545-TL-E or identify alternative parts with equivalent 50V ratings.

Current Capability: The MCH6541-TL-E provides 700mA maximum collector current, exceeding the MCH6545-TL-E specification of 500mA. This enhanced current capability supports applications with higher current demands within the 30V voltage constraint.

Saturation Voltage Characteristics: The MCH6541-TL-E exhibits higher saturation voltage (190–220mV) compared to the MCH6545-TL-E (100mV). Applications sensitive to saturation voltage performance must account for this difference in circuit design and thermal calculations.

Frequency Performance: The MCH6541-TL-E transition frequency of 540–520MHz meets or exceeds the MCH6545-TL-E specification of 500MHz, supporting equivalent high-speed switching performance.

Frequently Asked Questions (FAQ)

Q: Can the MCH6541-TL-E directly replace the MCH6545-TL-E in all applications?

A: Direct replacement is limited by voltage rating. The MCH6541-TL-E is suitable only for applications operating at 30V or below. Applications requiring 50V operation cannot use the MCH6541-TL-E as a substitute.

Q: What is the primary difference between these two parts?

A: The MCH6545-TL-E is rated for 50V operation with 500mA maximum collector current. The MCH6541-TL-E is rated for 30V operation with 700mA maximum collector current. Both share identical package, power rating, and thermal specifications.

Q: Are the package dimensions identical between MCH6545-TL-E and MCH6541-TL-E?

A: Yes. Both devices use the 6-MCPH surface mount package with 6-SMD flat leads, ensuring mechanical compatibility on printed circuit boards designed for either part.

Q: Does the MCH6541-TL-E meet the same environmental and regulatory requirements?

A: Yes. Both devices are ROHS3 compliant, REACH unaffected, and carry MSL rating of 1 (Unlimited), ensuring equivalent environmental and regulatory qualification.

Q: Why is the MCH6541-TL-E listed as active while the MCH6545-TL-E is obsolete?

A: Product status reflects manufacturing availability. The MCH6545-TL-E has been discontinued by the manufacturer. The MCH6541-TL-E remains in active production, ensuring supply continuity for new designs and ongoing production requirements.

Q: How does saturation voltage affect circuit performance?

A: Saturation voltage determines the voltage drop across the transistor in the saturated (fully conducting) state. The MCH6541-TL-E exhibits higher saturation voltage (190–220mV) than the MCH6545-TL-E (100mV). This affects power dissipation and output voltage levels in switching applications.

Q: Are the DC current gain characteristics equivalent?

A: The devices exhibit comparable DC current gain (hFE) characteristics. The MCH6545-TL-E specifies 300 minimum at 10mA and 2V. The MCH6541-TL-E specifies 300 minimum at 50mA and 2V, or 200 minimum at 10mA and 2V. Gain performance is application-dependent based on operating current levels.

Q: Can the MCH6541-TL-E be used in high-frequency switching applications?

A: Yes. The MCH6541-TL-E transition frequency of 540–520MHz meets or exceeds the MCH6545-TL-E specification of 500MHz, supporting equivalent high-speed switching performance within the 30V voltage constraint.

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