DDA143TH-7 Equivalent & Substitute Parts

Part Overview

The DDA143TH-7 is a pre-biased dual PNP bipolar junction transistor (BJT) manufactured by Diodes Incorporated in SOT-563 surface mount packaging. This component integrates two PNP transistors with internal biasing resistors, designed for applications requiring compact, pre-configured switching and amplification circuits. The part is currently in active product status with 3993 units in stock.

Substitute parts are necessary when the DDA143TH-7 becomes unavailable, reaches end-of-life, or when design requirements call for alternative biasing configurations or performance characteristics within the same functional category.

Key Parameters

Parameter	Value	Unit
Transistor Type	2 PNP - Pre-Biased (Dual)	—
Maximum Collector Current (Ic)	100	mA
Collector-Emitter Breakdown Voltage (Max)	50	V
Base Resistor (R1)	4.7	kOhms
Emitter-Base Resistor (R2)	—	—
DC Current Gain (hFE Min)	100 @ 1mA, 5V	—
Vce Saturation (Max)	300	mV
Transition Frequency	250	MHz
Maximum Power Dissipation	150	mW
Package Type	SOT-563	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the DDA143TH-7 is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Transistor configuration: 2 PNP - Pre-Biased (Dual)
Maximum collector current: 100 mA minimum
Collector-emitter breakdown voltage: 50 V minimum
Package type: SOT-563 surface mount
Base resistor value: 4.7 kOhms (primary configuration)
RoHS3 compliance and MSL 1 rating

Substitution Categories:

Category 1: Direct Electrical Equivalents (NSBA143 Series) Parts with identical base resistor configuration (R1 = 4.7 kOhms) and matching electrical specifications. These provide pin-for-pin compatibility with no circuit modifications required.

Category 2: Alternative Biasing Configurations (NSBA114 Series) Parts with different base resistor values (R1 = 10 kOhms) and emitter-base resistor configurations. These require circuit evaluation but maintain core electrical performance within specified limits.

Category 3: High-Impedance Biasing (NSBA115 Series) Parts with significantly higher base resistor values (R1 = 100 kOhms, R2 = 100 kOhms). These are suitable for applications requiring reduced base current draw.

Category 4: Automotive-Grade Alternative (NSBA144 Series) Parts with AEC-Q101 qualification and automotive-grade specifications. These are suitable for automotive applications with enhanced reliability requirements.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce(br) V	R1 kOhms	R2 kOhms	hFE Min @ Ic, Vce	Vce Sat (Max) mV	Power (Max) mW	Product Status	Package
DDA143TH-7	Diodes Inc.	100	50	4.7	—	100 @ 1mA, 5V	300	150	Active	SOT-563
NSBA143TDXV6T1G	onsemi	100	50	4.7	—	160 @ 5mA, 10V	250	500	Active	SOT-563
NSBA143TDXV6T5G	onsemi	100	50	4.7	—	160 @ 5mA, 10V	250	500	Obsolete	SOT-563
NSBA143ZDXV6T1G	onsemi	100	50	4.7	47	80 @ 5mA, 10V	250	500	Last Time Buy	SOT-563
NSBA114EDXV6T1G	onsemi	100	50	10	10	35 @ 5mA, 10V	250	500	Active	SOT-563
NSBA114TDXV6T1G	onsemi	100	50	10	—	160 @ 5mA, 10V	250	500	Active	SOT-563
NSBA114TDXV6T5G	onsemi	100	50	10	—	160 @ 5mA, 10V	250	500	Obsolete	SOT-563
NSBA114YDXV6T1G	onsemi	100	50	10	47	80 @ 5mA, 10V	250	500	Active	SOT-563
NSBA115EDXV6T1G	onsemi	100	50	100	100	80 @ 5mA, 10V	250	500	Active	SOT-563
NSBA144EDXV6T5G	onsemi	100	50	47	47	80 @ 5mA, 10V	250	357	Obsolete	SOT-563

Engineering Selection Recommendations

Primary Substitute (Direct Replacement): NSBA143TDXV6T1G is the recommended direct substitute. This part maintains identical base resistor configuration (R1 = 4.7 kOhms), matching collector current and breakdown voltage specifications. The part is in active product status with 35,259 units in stock. Power dissipation capability is increased to 500 mW, providing additional design margin. RoHS3 compliance and MSL 1 rating are maintained.

Secondary Substitutes (Circuit Evaluation Required): NSBA114TDXV6T1G and NSBA114YDXV6T1G are suitable alternatives when base resistor value modification is acceptable. These parts feature higher base resistor values (10 kOhms and 10 kOhms/47 kOhms respectively), resulting in reduced base current requirements. Both are in active product status. Circuit analysis is required to confirm compatibility with existing biasing networks.

Alternative for High-Impedance Applications: NSBA115EDXV6T1G provides the highest base resistor values (100 kOhms/100 kOhms) and is suitable for applications requiring minimal base current draw. This part is in active product status with 32,400 units in stock.

Parts to Avoid: NSBA143TDXV6T5G, NSBA114TDXV6T5G, and NSBA144EDXV6T5G are marked as obsolete and should not be selected for new designs. NSBA143ZDXV6T1G is marked as Last Time Buy and has limited availability.

Compliance Verification: All recommended substitutes maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage processes.

Frequently Asked Questions (FAQ)

Q: Can NSBA143TDXV6T1G be used as a direct replacement for DDA143TH-7 without circuit modifications?

A: Yes. NSBA143TDXV6T1G maintains identical base resistor configuration (R1 = 4.7 kOhms), collector current rating (100 mA), and breakdown voltage (50 V). The part is pin-compatible in SOT-563 packaging and requires no circuit modifications.

Q: What is the difference between NSBA143TDXV6T1G and NSBA114TDXV6T1G?

A: The primary difference is the base resistor value. NSBA143TDXV6T1G has R1 = 4.7 kOhms (matching DDA143TH-7), while NSBA114TDXV6T1G has R1 = 10 kOhms. The higher base resistor value in NSBA114TDXV6T1G reduces base current requirements. Both parts maintain identical collector current and breakdown voltage specifications.

Q: Why does NSBA143ZDXV6T1G include an emitter-base resistor (R2 = 47 kOhms) while DDA143TH-7 does not?

A: The addition of R2 provides enhanced biasing stability and temperature compensation in certain circuit topologies. This configuration is suitable for applications where improved thermal stability is required. Circuit evaluation is necessary to confirm compatibility.

Q: Is NSBA115EDXV6T1G suitable for all applications using DDA143TH-7?

A: NSBA115EDXV6T1G is suitable only for applications where the significantly higher base resistor values (100 kOhms/100 kOhms) are compatible with the biasing network. The reduced base current draw may require circuit modifications. Detailed circuit analysis is required before substitution.

Q: What is the significance of the product status field (Active, Obsolete, Last Time Buy)?

A: Active status indicates the part is in current production with ongoing availability. Obsolete status indicates the part is no longer manufactured and should not be selected for new designs. Last Time Buy status indicates limited remaining inventory and imminent discontinuation.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing processes and environmental requirements.

Q: Can NSBA144EDXV6T5G be used in automotive applications?

A: NSBA144EDXV6T5G includes AEC-Q101 automotive qualification. However, this part is marked as obsolete and should not be selected for new designs. For automotive applications, consult onsemi for current automotive-qualified alternatives.

Q: What is the impact of increased power dissipation (500 mW vs. 150 mW) in substitute parts?

A: The increased power dissipation capability in onsemi substitutes provides additional thermal margin and design flexibility. This does not require circuit modifications but allows operation at higher power levels if needed. Thermal management design should remain unchanged unless higher power operation is intended.

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