DCX143TH-7 Equivalent & Substitute Parts

Part Overview

The DCX143TH-7 is a pre-biased dual bipolar transistor (1 NPN, 1 PNP) manufactured by Diodes Incorporated in SOT-563 surface mount packaging. This component integrates internal biasing resistors to simplify circuit design in applications requiring complementary transistor pairs. The part is currently in active production status with 2500 units in stock.

Substitute parts become necessary when primary inventory is depleted, when alternative manufacturers offer improved availability, or when design requirements permit operation within the electrical parameter ranges of equivalent devices. The substitute parts listed maintain functional compatibility through matching collector current ratings, breakdown voltages, and package form factors while accommodating variations in internal resistor values and DC current gain specifications.

Key Parameters

Parameter	Value	Unit
Transistor Type	1 NPN, 1 PNP - Pre-Biased (Dual)	—
Current - Collector (Ic) (Max)	100	mA
Voltage - Collector Emitter Breakdown (Max)	50	V
Resistor - Base (R1)	4.7	kOhms
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 1mA, 5V	—
Vce Saturation (Max) @ Ib, Ic	300 @ 250µA, 2.5mA	mV
Current - Collector Cutoff (Max)	500	nA
Frequency - Transition	250	MHz
Power - Max	150	mW
Package / Case	SOT-563, SOT-666	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution compatibility for the DCX143TH-7 is determined by the following critical parameters:

Electrical Compatibility Criteria:

Maximum collector current: 100 mA (all substitutes maintain this rating)
Collector-emitter breakdown voltage: 50 V (all substitutes maintain this rating)
Base resistor value: 4.7 kOhms (primary matching criterion for DCX143TH-7 equivalents)
Package type: SOT-563 surface mount (all substitutes support this package)
Dual configuration: 1 NPN, 1 PNP pre-biased transistor pair (all substitutes maintain this topology)

Acceptable Parameter Variations:

DC current gain (hFE) may vary between 35 and 160 depending on measurement conditions and part variant
Vce saturation voltage may range from 100 mV to 300 mV depending on bias conditions
Power dissipation rating may be 150 mW, 300 mW, or 500 mW
Transition frequency specification may be present (250 MHz) or not specified
Emitter-base resistor (R2) may be absent or specified as 10 kOhms or 47 kOhms

Product Status Considerations:

Active status parts are preferred for new designs
Obsolete status parts are available but not recommended for new applications
Not For New Designs status indicates limited future availability

Substitutes are grouped into three categories: direct equivalents (matching base resistor value), alternative configurations (different resistor values), and legacy options (obsolete status).

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce Breakdown (Max) V	R1 (Base) kOhms	R2 (Emitter-Base) kOhms	hFE (Min) @ Ic, Vce	Vce Sat (Max) mV	Power (Max) mW	Status	Inventory Pcs
DCX143TH-7	Diodes Incorporated	100	50	4.7	—	100 @ 1mA, 5V	300	150	Active	2500
NSBC143TPDXV6T1G	onsemi	100	50	4.7	—	160 @ 5mA, 10V	250	500	Active	97400
NSBC143ZPDXV6T1G	onsemi	100	50	4.7	47	80 @ 5mA, 10V	250	500	Active	18240
PEMD13,115	Nexperia USA Inc.	100	50	4.7	47	100 @ 10mA, 5V	100	300	Not For New Designs	4809
EMD4DXV6T1G	onsemi	100	50	47 / 10	47	80 @ 5mA, 10V	250	500	Active	25200
EMD4DXV6T5G	onsemi	100	50	47 / 10	47	80 @ 5mA, 10V	250	500	Obsolete	45200
EMD5DXV6T5G	onsemi	100	50	4.7 / 47	10 / 47	80 @ 5mA, 10V / 20 @ 5mA, 10V	250	500	Obsolete	1159
NSBC114EPDXV6T1G	onsemi	100	50	10	10	35 @ 5mA, 10V	250	500	Active	25300
NSBC114TPDXV6T1G	onsemi	100	50	10	—	160 @ 5mA, 10V	250	500	Active	1016
NSBC114YPDXV6T1G	onsemi	100	50	10	47	80 @ 5mA, 10V	250	500	Active	145400
NSBC114YPDXV6T5G	onsemi	100	50	10	47	80 @ 5mA, 10V	250	500	Obsolete	960

Engineering Selection Recommendations

Direct Electrical Equivalents (Preferred for Replacement):

NSBC143TPDXV6T1G and NSBC143ZPDXV6T1G maintain the 4.7 kOhms base resistor value of the DCX143TH-7, ensuring identical biasing network behavior. Both parts are manufactured by onsemi and carry Active product status. NSBC143TPDXV6T1G offers the closest match with no emitter-base resistor specification, while NSBC143ZPDXV6T1G includes a 47 kOhms emitter-base resistor. Both support SOT-563 packaging and exceed the power rating of the original part (500 mW versus 150 mW).

Alternative Configuration Substitutes (Acceptable with Circuit Verification):

EMD4DXV6T1G and NSBC114YPDXV6T1G provide functional substitution with modified internal resistor networks. EMD4DXV6T1G uses dual base resistor values (47 kOhms / 10 kOhms) with 47 kOhms emitter-base resistor. NSBC114YPDXV6T1G uses 10 kOhms base resistor with 47 kOhms emitter-base resistor. These parts maintain electrical ratings but alter biasing characteristics. Both are Active status with high inventory availability.

Legacy Parts (Not Recommended for New Designs):

PEMD13,115 carries Not For New Designs status and should be avoided for new applications despite adequate electrical specifications. EMD4DXV6T5G, EMD5DXV6T5G, and NSBC114YPDXV6T5G are marked Obsolete and should only be used when existing inventory must be consumed or when design lock-in to legacy components is required.

Compliance and Certification:

All listed substitutes maintain ROHS3 compliance, MSL Level 1 (Unlimited moisture sensitivity), and REACH Unaffected status, matching the environmental and regulatory profile of the DCX143TH-7.

Frequently Asked Questions (FAQ)

Q: Can NSBC143TPDXV6T1G directly replace DCX143TH-7 without circuit modification?

A: NSBC143TPDXV6T1G maintains identical base resistor value (4.7 kOhms), collector current rating (100 mA), breakdown voltage (50 V), and SOT-563 package. The primary difference is increased power rating (500 mW versus 150 mW) and higher DC current gain specification (160 @ 5mA, 10V versus 100 @ 1mA, 5V). Direct substitution is supported without circuit modification.

Q: What is the difference between NSBC143ZPDXV6T1G and NSBC143TPDXV6T1G?

A: NSBC143ZPDXV6T1G includes a 47 kOhms emitter-base resistor (R2), while NSBC143TPDXV6T1G has no emitter-base resistor specified. Both maintain the 4.7 kOhms base resistor. The presence of R2 affects switching speed and leakage current characteristics. Selection depends on circuit requirements for these parameters.

Q: Why do NSBC114 variants have different base resistor values than DCX143TH-7?

A: NSBC114 series parts use 10 kOhms base resistor instead of 4.7 kOhms. This higher resistance value reduces base current and alters the biasing network. NSBC114 variants are suitable only when circuit design accommodates this resistor change or when the application permits wider DC current gain variation (35 to 160 depending on variant).

Q: Are obsolete parts (EMD4DXV6T5G, EMD5DXV6T5G, NSBC114YPDXV6T5G) acceptable for production use?

A: Obsolete parts carry no manufacturer commitment for future availability or quality assurance. These parts should be used only when existing inventory must be consumed or when design is locked to legacy components. Active status parts (NSBC143TPDXV6T1G, NSBC143ZPDXV6T1G, NSBC114YPDXV6T1G) are recommended for all new production designs.

Q: Does package type affect substitution compatibility?

A: All listed substitutes support SOT-563 surface mount packaging, matching the DCX143TH-7 form factor. Some parts also support SOT-666 package option. Package compatibility is maintained across all substitutes listed in this reference.

Q: What is the significance of the transition frequency (250 MHz) specification?

A: The DCX143TH-7 specifies 250 MHz transition frequency. Most substitute parts do not specify this parameter. When transition frequency is critical to circuit performance, NSBC143TPDXV6T1G and NSBC143ZPDXV6T1G are preferred as they maintain the onsemi manufacturing lineage and electrical characteristics most closely aligned with the original part.

Q: Can I use PEMD13,115 as a substitute despite "Not For New Designs" status?

A: PEMD13,115 maintains electrical compatibility but carries Not For New Designs status, indicating the manufacturer does not recommend this part for new applications. Use only when existing inventory must be consumed or when design is locked to this specific component. Active status alternatives are available and preferred.

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