BCR 129F E6327 Equivalent & Substitute Parts

Part Overview

The BCR 129F E6327 is a pre-biased NPN bipolar junction transistor (BJT) manufactured by Infineon Technologies in the PG-TSFP-3 package. This component is designed for surface mount applications requiring 50 V collector-emitter breakdown voltage and 100 mA maximum collector current. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for new designs and production continuity.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN - Pre-Biased	—
Current - Collector (Ic) Max	100	mA
Voltage - Collector Emitter Breakdown (Max)	50	V
Resistor - Base (R1)	10	kOhms
DC Current Gain (hFE) Min @ Ic, Vce	120 @ 5mA, 5V	—
Vce Saturation (Max) @ Ib, Ic	300mV @ 500µA, 10mA	—
Current - Collector Cutoff (Max)	100	nA
Frequency - Transition	150	MHz
Power - Max	250	mW
Mounting Type	Surface Mount	—
Package / Case	SOT-723	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the BCR 129F E6327 is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Transistor Type: NPN - Pre-Biased
Current - Collector (Ic) Max: 100 mA
Voltage - Collector Emitter Breakdown (Max): 50 V
Resistor - Base (R1): 10 kOhms
Mounting Type: Surface Mount
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Allowable Variation Parameters:

DC Current Gain (hFE): Substitute parts may have different hFE values provided the minimum specification is met or exceeded
Vce Saturation: Substitute parts may have lower saturation voltage (improved performance)
Current - Collector Cutoff (Max): Substitute parts may have higher cutoff current values
Frequency - Transition: Substitute parts may have equal or higher transition frequency
Power - Max: Substitute parts may have equal or higher power dissipation rating
Package / Case: Substitute parts may use equivalent surface mount packages (SOT-723, SOT-23-3, SC-59, SST3, SMT3) with compatible pinout

All substitute parts listed maintain active product status and RoHS3 compliance, ensuring long-term availability and regulatory conformance.

Parameter Comparison

Part Number	Manufacturer	Ic Max (mA)	Vce Breakdown (V)	R1 (kOhms)	hFE Min @ Ic, Vce	Vce Sat Max (mV)	Icbo Max (nA)	Freq Trans (MHz)	Power Max (mW)	Package	Status
BCR 129F E6327	Infineon	100	50	10	120 @ 5mA, 5V	300 @ 500µA, 10mA	100	150	250	SOT-723	Obsolete
DTC114EM3T5G	onsemi	100	50	10	35 @ 5mA, 10V	250 @ 300µA, 10mA	500	—	260	SOT-723	Active
DTC114TCA-TP	Micro Commercial Co	100	50	10	100 @ 1mA, 5V	300 @ 1mA, 10mA	500	250	SOT-23	Active
DTC114TCAT116	Rohm Semiconductor	100	50	10	100 @ 1mA, 5V	300 @ 1mA, 10mA	500	250	SST3	Active
DTC114TKAT146	Rohm Semiconductor	100	50	10	100 @ 1mA, 5V	300 @ 1mA, 10mA	500	250	SMT3	Active
DTC114TM3T5G	onsemi	100	50	10	160 @ 5mA, 10V	250 @ 1mA, 10mA	500	—	260	SOT-723	Active
DTC114YM3T5G	onsemi	100	50	10	80 @ 5mA, 10V	250 @ 300µA, 10mA	500	—	260	SOT-723	Active
MMUN2215LT1G	onsemi	100	50	10	160 @ 5mA, 10V	250 @ 1mA, 10mA	500	—	400	SOT-23-3	Active
MUN2215T1G	onsemi	100	50	10	160 @ 5mA, 10V	250 @ 1mA, 10mA	500	—	338	SC-59	Active
PDTC114TT,235	Nexperia USA Inc.	100	50	10	200 @ 1mA, 5V	150 @ 500µA, 10mA	1000	—	250	TO-236AB	Active

Engineering Selection Recommendations

All listed substitute parts maintain the core electrical specifications required for BCR 129F E6327 replacement: 100 mA collector current, 50 V breakdown voltage, and 10 kOhms base resistor. Selection among substitutes is based on the following criteria:

For Direct SOT-723 Package Replacement: DTC114EM3T5G, DTC114TM3T5G, and DTC114YM3T5G (onsemi) provide pin-compatible alternatives in the original SOT-723 package. All three are active products with RoHS3 compliance and MSL 1 rating. DTC114TM3T5G offers the highest hFE (160 @ 5mA, 10V) and improved saturation voltage (250 mV), making it suitable for applications requiring enhanced gain characteristics.

For SOT-23-3 / SC-59 Package Compatibility: DTC114TCA-TP (Micro Commercial Co), DTC114TKAT146 and DTC114TCAT116 (Rohm Semiconductor), MMUN2215LT1G, and MUN2215T1G (onsemi) provide equivalent electrical performance in larger surface mount packages. These alternatives offer higher power dissipation ratings (200–400 mW) and are recommended for applications with thermal margin requirements. MMUN2215LT1G and MUN2215T1G provide the highest power rating (400 mW and 338 mW respectively).

For Lowest Saturation Voltage Applications: PDTC114TT,235 (Nexperia USA Inc.) delivers the lowest Vce saturation (150 mV @ 500µA, 10mA) and highest DC current gain (200 @ 1mA, 5V), suitable for low-power switching applications requiring minimal voltage drop.

All substitute parts are active products with confirmed RoHS3 compliance and unlimited moisture sensitivity rating, ensuring regulatory conformance and long-term supply availability.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with a different package type (SOT-23 instead of SOT-723)?

A: Package substitution is possible only if the printed circuit board layout and assembly equipment support the alternative package footprint. SOT-723 is a smaller package than SOT-23-3 or SC-59. Physical board space, solder reflow profile compatibility, and pick-and-place machine capability must be verified before substitution. Electrical performance remains equivalent across all listed packages.

Q: What is the significance of the base resistor (R1) value in pre-biased transistors?

A: The 10 kOhms base resistor is an internal component of the pre-biased transistor that establishes the bias point. All listed substitutes maintain this 10 kOhms specification, ensuring equivalent biasing behavior. This parameter is non-negotiable for direct substitution.

Q: Why do some substitute parts have higher DC current gain (hFE) than the original BCR 129F E6327?

A: Higher hFE values indicate improved current amplification. Substitutes with hFE of 160 or 200 (compared to the original 120) provide enhanced gain margin. This is an improvement that does not compromise circuit function, as the application circuit is designed to operate with the specified minimum hFE. Higher gain may reduce base current requirements in switching applications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry RoHS3 compliance certification, confirming restriction of hazardous substances per EU Directive 2011/65/EU. This ensures regulatory conformance for both new designs and legacy product support.

Q: What is the difference between SOT-723, SOT-23-3, SST3, SMT3, and SC-59 packages?

A: These are all surface mount packages with three leads, but differ in physical dimensions and thermal characteristics. SOT-723 is the smallest (1.6 mm × 1.6 mm), followed by SOT-23-3 (2.9 mm × 1.3 mm), SST3 and SMT3 (Rohm variants of SOT-23-3), and SC-59 (2.9 mm × 1.3 mm). All are electrically equivalent with identical pinout. Package selection depends on available board space and thermal requirements.

Q: Can I substitute BCR 129F E6327 with PDTC114TT,235 if my circuit requires the lowest saturation voltage?

A: Yes. PDTC114TT,235 delivers 150 mV saturation voltage compared to the original 300 mV, representing a 50% reduction. This is advantageous in low-power switching circuits where minimizing voltage drop across the transistor is critical. The TO-236AB package is compatible with standard SOT-23-3 footprints. Verify board layout compatibility before implementation.

Q: What does "Moisture Sensitivity Level (MSL) 1 (Unlimited)" mean?

A: MSL 1 indicates the component can be stored indefinitely without moisture absorption concerns. No baking or special moisture control is required before soldering. All listed substitutes carry MSL 1 rating, ensuring identical handling and storage requirements.

Q: Is the transition frequency (Frequency - Transition) critical for substitution?

A: Transition frequency indicates the maximum frequency at which the transistor maintains useful gain. The original BCR 129F E6327 specifies 150 MHz. Substitutes with equal or higher transition frequency (250 MHz for DTC114 variants) are fully compatible and provide improved high-frequency performance. Lower transition frequency would be unacceptable; none of the listed substitutes fall below this threshold.

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