2N4237 Equivalent & Substitute Parts Engineering Reference

Part Overview

The 2N4237 is an NPN bipolar junction transistor (BJT) manufactured by Microchip Technology. It offers a collector-emitter breakdown voltage of 40 V, a collector current rating of 1 A, and a maximum power dissipation of 1 W. Housed in a TO-39 metal can package, the device is intended for through-hole mounting and is rated for operation from -65°C to 200°C. This component is active and available in inventory.

The identification of substitute models is necessary for situations where specific regulatory compliance is required (such as RoHS), where procurement priorities change, or where system designs require compatibility with available inventory.

Key Parameters

Parameter	2N4237
Transistor Type	NPN
Voltage - Collector Emitter Breakdown (Max)	40 V
Current - Collector (Ic) (Max)	1 A
Vce Saturation (Max) @ Ib, Ic	600mV @ 100mA, 1A
Current - Collector Cutoff (Max)	100nA
DC Current Gain (hFE) (Min) @ Ic, Vce	30 @ 500mA, 1V
Power - Max	1 W
Operating Temperature	-65°C ~ 200°C
Mounting Type	Through Hole
Package / Case	TO-205AD, TO-39-3 Metal Can
RoHS Status	RoHS non-compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute part selection for the NPN BJT category is based only on matched electrical and mechanical characteristics. Key substitution parameters include transistor type (NPN), collector-emitter breakdown voltage, maximum collector current, collector cutoff current, DC current gain, maximum power dissipation, operating temperature range, mounting type, and package/case compatibility. Only parts that match these key parameters as provided are considered suitable substitutes.

Parameter Comparison

Parameter	2N4237	2N2218A PBFREE	2N3053 PBFREE
Transistor Type	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	40 V	40 V	40 V
Current - Collector (Ic) (Max)	1 A	800 mA	700 mA
Vce Saturation (Max) @ Ib, Ic	600mV @ 100mA, 1A	1V @ 50mA, 500mA	1.4V @ 15mA, 150mA
Current - Collector Cutoff (Max)	100nA	10nA	-
DC Current Gain (hFE) (Min) @ Ic, Vce	30 @ 500mA, 1V	40 @ 150mA, 10V	50 @ 150mA, 10V
Power - Max	1 W	800 mW	5 W
Operating Temperature	-65°C ~ 200°C	-65°C ~ 200°C (TJ)	-65°C ~ 200°C (TJ)
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-205AD, TO-39-3 Metal Can	TO-205AD, TO-39-3 Metal Can	TO-205AD, TO-39-3 Metal Can
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Obsolete	Active

Engineering Selection Recommendations

Selection from the substitute parts should consider product status and regulatory compliance. The 2N4237 is active but RoHS non-compliant. The 2N2218A PBFREE is obsolete but carries ROHS3 compliance. The 2N3053 PBFREE is active and ROHS3 compliant. All substitutes conform to REACH unaffected status and suitable package/case specifications. These parameters determine suitability for designs requiring active status and compliance certifications.

Frequently Asked Questions (FAQ)

Q1: What electrical parameters must match for an NPN BJT to be a suitable substitute?
Strict matching of transistor type, collector-emitter breakdown voltage, collector current rating, DC current gain, cutoff current, maximum power dissipation, operating temperature range, and mounting type is required.

Q2: Are the substitute parts mechanically compatible with the 2N4237?
All listed substitutes share the TO-205AD, TO-39-3 metal can package and through-hole mounting, ensuring mechanical compatibility.

Q3: Does RoHS or REACH status affect part selection?
RoHS status is relevant for compliance in regulated environments; the 2N4237 is RoHS non-compliant, while substitutes 2N2218A PBFREE and 2N3053 PBFREE are ROHS3 compliant. All listed devices are REACH unaffected.

Q4: How does product status influence substitution?
Product status determines availability: active parts such as the 2N4237 and 2N3053 PBFREE are maintained in inventory, while obsolete parts like the 2N2218A PBFREE may be limited in future supply.

Q5: Why is package type important for substitution?
Package/case type, specifically TO-205AD, TO-39-3, ensures compatibility with existing PCB layouts and mechanical constraints. Only substitutes with matching package are listed.

Q6: Are there notable differences in maximum ratings among listed substitutes? Current, voltage, and power ratings vary among substitutes and the main part. Careful comparison within specified parameters is necessary to ensure alignment with application requirements.

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