BCR135E6433HTMA1 Equivalent & Substitute Parts

Part Overview

The BCR135E6433HTMA1 is a pre-biased NPN bipolar junction transistor (BJT) manufactured by Infineon Technologies in SOT-23-3 surface mount package. This component is classified as obsolete product status. The part integrates internal base and emitter resistors (R1: 10 kOhms, R2: 47 kOhms) for simplified circuit design in switching and amplification applications. Due to obsolete status, equivalent substitute parts from active manufacturers are necessary to maintain design continuity and ensure long-term supply chain reliability.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN - Pre-Biased	—
Collector Current (Ic) Maximum	100	mA
Collector-Emitter Breakdown Voltage (Max)	50	V
Base Resistor (R1)	10	kOhms
Emitter-Base Resistor (R2)	47	kOhms
DC Current Gain (hFE) Minimum	70 @ 5mA, 5V	—
Vce Saturation Maximum	300	mV
Transition Frequency	150	MHz
Power Dissipation Maximum	200	mW
Package Type	SOT-23-3 (TO-236-3, SC-59)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the BCR135E6433HTMA1 is determined by strict equivalence of the following critical parameters:

Primary Substitution Criteria:

Transistor type: NPN pre-biased configuration
Maximum collector current: 100 mA
Collector-emitter breakdown voltage: 50 V
Package: SOT-23-3 surface mount
Base resistor (R1): 10 kOhms
Emitter-base resistor (R2): 47 kOhms (where applicable)
RoHS3 compliance
Moisture sensitivity level: 1

Secondary Compatibility Parameters:

DC current gain (hFE) minimum specification
Vce saturation voltage
Transition frequency
Power dissipation rating
Product status (active preferred for obsolete parts)

Substitute parts are grouped into two categories based on internal resistor configuration:

Group A - Matched R1/R2 Configuration (10k/47k): Direct functional equivalents with identical internal resistor values. These parts require no circuit redesign.

Group B - Alternative R1/R2 Configuration: Parts with different internal resistor values (10k/10k or 4.7k base resistor). These require circuit evaluation but maintain core electrical performance within the 50V/100mA envelope.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce(br) V	R1 kOhms	R2 kOhms	hFE Min @ Ic,Vce	Vce Sat (Max) mV	Freq MHz	Power mW	Status
BCR135E6433HTMA1	Infineon	100	50	10	47	70 @ 5mA, 5V	300	150	200	Obsolete
DDTC114YCA-7-F	Diodes Inc.	100	50	10	47	68 @ 5mA, 5V	300	250	200	Active
MMUN2214LT1G	onsemi	100	50	10	47	80 @ 5mA, 10V	250	—	246	Active
SMMUN2214LT1G	onsemi	100	50	10	47	80 @ 5mA, 10V	250	—	246	Active
DTC114YKAT146	Rohm	100	50	10	47	68 @ 5mA, 5V	300	250	200	Active
DDTC114ECAQ-7-F	Diodes Inc.	100	50	10	10	35 @ 5mA, 5V	300	250	200	Active
DDTC114TCA-7-F	Diodes Inc.	100	50	10	—	100 @ 1mA, 5V	300	250	200	Active
MMUN2211LT1G	onsemi	100	50	10	10	35 @ 5mA, 10V	250	—	246	Active
MMUN2211LT3G	onsemi	100	50	10	10	35 @ 5mA, 10V	250	—	246	Active
MMUN2216LT1G	onsemi	100	50	4.7	—	160 @ 5mA, 10V	250	—	400	Active
MMUN2238LT1G	onsemi	100	50	2.2	—	160 @ 5mA, 10V	250	—	246	Active

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents):

The following parts maintain identical internal resistor configuration (R1: 10 kOhms, R2: 47 kOhms) and are direct functional replacements:

DDTC114YCA-7-F (Diodes Incorporated): Active status, 250 MHz transition frequency, Cut Tape packaging. Electrical parameters within specification envelope.
DTC114YKAT146 (Rohm Semiconductor): Active status, 250 MHz transition frequency, high inventory availability (689,300 pcs). AEC-Q101 automotive qualification maintained.
MMUN2214LT1G (onsemi): Active status, Cut Tape packaging, 1,004,100 pcs inventory. Slightly elevated hFE (80 vs 70) and reduced Vce saturation (250mV vs 300mV).
SMMUN2214LT1G (onsemi): Active status, Tape & Reel packaging, identical electrical specifications to MMUN2214LT1G.

Secondary Substitutes (Modified Resistor Configuration):

These parts maintain 50V/100mA core specifications but feature altered internal resistor networks. Circuit validation is required:

DDTC114ECAQ-7-F (Diodes Incorporated, Manufacturer Recommended): R1: 10k, R2: 10k. Lower hFE (35 vs 70). AEC-Q101 automotive qualified. Tape & Reel packaging.
MMUN2211LT1G / MMUN2211LT3G (onsemi, Manufacturer Recommended): R1: 10k, R2: 10k. hFE: 35. Higher inventory (1,744,637 and 855,400 pcs respectively).
MMUN2216LT1G (onsemi, Manufacturer Recommended): R1: 4.7k. hFE: 160. Elevated power rating (400mW vs 200mW). Tape & Reel packaging.
MMUN2238LT1G (onsemi, Manufacturer Recommended): R1: 2.2k. hFE: 160. Tape & Reel packaging.

Compliance & Availability:

All substitute parts maintain ROHS3 compliance, MSL Level 1, and REACH unaffected status. Active product status ensures long-term availability and supply chain continuity. Diodes Incorporated and onsemi parts demonstrate highest inventory levels (3,400 to 1,744,637 units).

Frequently Asked Questions (FAQ)

Q1: Can DDTC114YCA-7-F directly replace BCR135E6433HTMA1 without circuit modification?

A: Yes. DDTC114YCA-7-F maintains identical internal resistor configuration (R1: 10k, R2: 47k), collector current rating (100mA), and breakdown voltage (50V). Electrical parameters (hFE: 68 vs 70, Vce saturation: 300mV) are within specification tolerance. SOT-23-3 package compatibility is confirmed.

Q2: What is the difference between MMUN2214LT1G and MMUN2211LT1G?

A: MMUN2214LT1G features R1: 10k, R2: 47k (matched to BCR135E6433HTMA1). MMUN2211LT1G features R1: 10k, R2: 10k. The altered emitter-base resistor affects circuit biasing characteristics. MMUN2211LT1G exhibits lower hFE (35 vs 80) and reduced Vce saturation (250mV vs 250mV). Circuit evaluation is required for MMUN2211LT1G substitution.

Q3: Why do some substitutes have different power ratings (246mW vs 200mW)?

A: Power dissipation ratings reflect thermal design differences between manufacturers. onsemi parts (MMUN series) specify 246mW; Infineon and Diodes specify 200mW. All parts operate within the same electrical envelope (50V, 100mA). The higher rating provides additional thermal margin but does not alter functional compatibility.

Q4: Is DTC114YKAT146 suitable for automotive applications?

A: Yes. DTC114YKAT146 carries AEC-Q101 automotive qualification, matching the original BCR135E6433HTMA1 grade specification. Rohm Semiconductor maintains high inventory (689,300 pcs), ensuring supply reliability for automotive production volumes.

Q5: What packaging options are available for substitutes?

A: Substitute parts are available in two packaging formats: Cut Tape (CT) & Digi-Reel® and Tape & Reel (TR). All maintain SOT-23-3 (TO-236-3, SC-59) physical package compatibility. Packaging selection depends on assembly process requirements and volume specifications.

Q6: Can MMUN2216LT1G or MMUN2238LT1G replace BCR135E6433HTMA1?

A: These parts maintain 50V/100mA core specifications but feature significantly different internal base resistor values (4.7k and 2.2k respectively) and elevated hFE (160 vs 70). Circuit redesign and validation are required. These parts are suitable only when higher gain and lower base resistance are functionally acceptable.

Q7: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, matching the original BCR135E6433HTMA1 environmental specifications.

Q8: Which substitute offers the highest inventory availability?

A: MMUN2211LT1G (onsemi) provides the highest inventory at 1,744,637 units. For direct R1/R2 equivalents, MMUN2214LT1G offers 1,004,100 units. DTC114YKAT146 (Rohm) provides 689,300 units with automotive qualification.

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