DEMD48-7 Equivalent & Substitute Parts

Part Overview

The DEMD48-7 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 for simplified circuit design in switching and amplification applications. The part is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing production and design requirements. Substitute parts must maintain electrical compatibility across collector current, breakdown voltage, saturation characteristics, and internal resistor configurations.

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
Power - Max	300	mW
Resistor - Base (R1)	47kOhms, 2.2kOhms	—
Resistor - Emitter Base (R2)	47kOhms	—
DC Current Gain (hFE) Min @ Ic, Vce	80 @ 5mA, 5V / 100 @ 10mA, 5V	—
Vce Saturation (Max) @ Ib, Ic	150mV @ 500µA, 10mA / 100mV @ 250µA, 5mA	—
Current - Collector Cutoff (Max)	1	µA
Mounting Type	Surface Mount	—
Package / Case	SOT-563, SOT-666	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the DEMD48-7 is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Matching Parameters:

Transistor configuration: 1 NPN, 1 PNP pre-biased dual package
Maximum collector current: 100mA
Collector-emitter breakdown voltage: 50V
Surface mount packaging: SOT-563 or SOT-666
Internal base and emitter-base resistor values

Substitution Logic: Substitute parts are grouped into two categories based on internal resistor configuration and product status:

Direct Electrical Equivalents — Parts with identical or functionally equivalent internal resistor networks (R1 and R2 values) and matching DC current gain specifications at rated conditions. These parts maintain pin-for-pin compatibility and circuit behavior.
Functional Alternatives — Parts with different internal resistor configurations that alter DC current gain characteristics but maintain the same maximum electrical ratings (Ic, Vce, power dissipation). These require circuit validation to confirm suitability for the application.

Active product status parts are prioritized for new designs. Obsolete and Last Time Buy designations indicate limited availability and are suitable only for legacy system support or existing inventory management.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Product Status	Ic (Max) mA	Vce Breakdown (Max) V	Power (Max) mW	R1 (Base) kOhms	R2 (Emitter-Base) kOhms	hFE Min @ 5mA, 10V	Vce Sat (Max) @ 300µA, 10mA mV	Package
DEMD48-7	Diodes Incorporated	Obsolete	100	50	300	47, 2.2	47	80 / 100	150 / 100	SOT-563
PEMD48,115	Nexperia USA Inc.	Not For New Designs	100	50	300	4.7, 22	47	80 / 100	150 / 100	SOT-666
EMD4DXV6T1G	onsemi	Active	100	50	500	47, 10	47	80	250	SOT-563
EMD4DXV6T5G	onsemi	Obsolete	100	50	500	47, 10	47	80	250	SOT-563
EMD5DXV6T5G	onsemi	Obsolete	100	50	500	4.7, 47	10, 47	80 / 20	250	SOT-563
NSBC114EPDXV6T1G	onsemi	Active	100	50	500	10	10	35	250	SOT-563
NSBC114YPDXV6T1G	onsemi	Active	100	50	500	10	47	80	250	SOT-563
NSBC114YPDXV6T5G	onsemi	Obsolete	100	50	500	10	47	80	250	SOT-563
NSBC143EPDXV6T1G	onsemi	Last Time Buy	100	50	500	4.7	4.7	15	250	SOT-563
NSBC143TPDXV6T1G	onsemi	Active	100	50	500	4.7	—	160	250	SOT-563
NSBC143ZPDXV6T1G	onsemi	Active	100	50	500	4.7	47	80	250	SOT-563

Engineering Selection Recommendations

For Active Production and New Designs:

The NSBC143ZPDXV6T1G (onsemi) is the primary recommended substitute. This part maintains active product status, carries ROHS3 compliance and REACH unaffected certification, and provides the closest electrical match to the DEMD48-7 across internal resistor configuration (R1: 4.7kOhms, R2: 47kOhms) and DC current gain (80 @ 5mA, 10V). The increased power rating (500mW vs. 300mW) provides additional thermal margin. Tape & Reel packaging ensures supply chain continuity.

Secondary Active Alternatives:

NSBC114YPDXV6T1G (onsemi) offers active status with identical DC current gain specification (80 @ 5mA, 10V) but employs lower base resistor values (R1: 10kOhms, R2: 47kOhms). This configuration produces faster switching response and is suitable for applications requiring reduced propagation delay. Circuit validation is required to confirm compatibility with existing designs.

NSBC143TPDXV6T1G (onsemi) provides the highest DC current gain (160 @ 5mA, 10V) among active alternatives, suitable for applications requiring maximum amplification with minimal base drive current. The absence of specified R2 value indicates internal configuration differences requiring application-level verification.

For Legacy System Support:

EMD4DXV6T1G (onsemi, Active) maintains the same internal resistor network as EMD4DXV6T5G and provides continued availability with active product status. Both parts are suitable for sustaining existing designs with established performance validation.

Compliance and Regulatory:

All recommended substitutes maintain ROHS3 compliance, MSL Level 1 (unlimited moisture sensitivity), REACH unaffected status, and EAR99 export classification, matching the regulatory profile of the DEMD48-7.

Frequently Asked Questions (FAQ)

Q: Can NSBC114EPDXV6T1G replace DEMD48-7 directly in existing circuits?

A: NSBC114EPDXV6T1G maintains identical maximum electrical ratings (100mA, 50V, 500mW) and SOT-563 packaging. However, the internal base resistor (10kOhms) differs significantly from DEMD48-7 (47kOhms, 2.2kOhms), resulting in lower DC current gain (35 @ 5mA, 10V vs. 80-100). Direct substitution requires circuit analysis to confirm adequate base drive current availability. This part is suitable only for applications with high base current capability.

Q: What is the difference between NSBC143TPDXV6T1G and NSBC143ZPDXV6T1G?

A: Both parts share the same base resistor value (4.7kOhms) and active product status. NSBC143TPDXV6T1G specifies DC current gain of 160 @ 5mA, 10V with no R2 value listed, indicating a different internal emitter-base resistor configuration. NSBC143ZPDXV6T1G specifies R2 as 47kOhms with DC current gain of 80 @ 5mA, 10V. NSBC143ZPDXV6T1G provides closer electrical equivalence to DEMD48-7 and is the preferred substitute for direct replacement.

Q: Are SOT-563 and SOT-666 packages interchangeable?

A: SOT-563 and SOT-666 are distinct surface mount packages with different footprints and pin configurations. While both are listed as available package options for many substitute parts, PCB layout and assembly equipment compatibility must be verified. DEMD48-7 is supplied in SOT-563; substitutes in SOT-666 require PCB redesign and assembly process validation.

Q: Why do some substitute parts have higher power ratings (500mW vs. 300mW)?

A: Higher power ratings indicate improved thermal performance and greater margin for transient current conditions. Parts rated at 500mW (EMD4DXV6T1G, EMD4DXV6T5G, NSBC series) provide enhanced reliability in applications with variable load conditions or elevated ambient temperatures. The increased rating does not alter electrical switching characteristics and is fully backward compatible with designs specified for 300mW operation.

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

A: Active status indicates ongoing manufacturing and supply availability suitable for new designs. Obsolete status indicates discontinued production; existing inventory may be available but future supply is not guaranteed. Last Time Buy status indicates a defined final purchase opportunity before discontinuation. For production designs, Active status parts (NSBC143ZPDXV6T1G, NSBC143TPDXV6T1G, NSBC114YPDXV6T1G, EMD4DXV6T1G) are required to ensure long-term supply chain continuity.

Q: How do internal resistor values affect circuit behavior?

A: Internal base resistor (R1) and emitter-base resistor (R2) values determine the DC current gain and switching speed of the pre-biased transistor. Lower R1 values increase base current and reduce required external drive current. Lower R2 values increase emitter current and affect saturation voltage. Substitutes with different resistor configurations alter the input impedance and switching threshold, requiring circuit validation to confirm functional equivalence in the target application.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance certification, matching the regulatory requirement of DEMD48-7. Moisture sensitivity level is MSL 1 (Unlimited) for all parts, indicating no special storage or handling requirements.

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