BSR18A_D87Z Equivalent & Substitute Parts

Part Overview

The BSR18A_D87Z is a PNP bipolar junction transistor manufactured by onsemi, designed for surface mount applications in the SOT-23-3 package. This component operates at a maximum collector current of 200 mA with a collector-emitter breakdown voltage of 40 V and a transition frequency of 250 MHz. The part is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements.

Key Parameters

Parameter	Value
Transistor Type	PNP
Current - Collector (Ic) (Max)	200 mA
Voltage - Collector Emitter Breakdown (Max)	40 V
Vce Saturation (Max) @ Ib, Ic	400mV @ 5mA, 50mA
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 10mA, 1V
Power - Max	350 mW
Frequency - Transition	250 MHz
Operating Temperature	-55°C ~ 150°C (TJ)
Package / Case	SOT-23-3 (TO-236-3, SC-59)
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the BSR18A_D87Z is determined by strict equivalence across the following critical parameters:

Direct Equivalents maintain identical electrical specifications:

Transistor Type: PNP
Current - Collector (Ic) (Max): 200 mA
Voltage - Collector Emitter Breakdown (Max): 40 V
Vce Saturation (Max) @ Ib, Ic: 400mV @ 5mA, 50mA
DC Current Gain (hFE) (Min) @ Ic, Vce: 100 @ 10mA, 1V
Frequency - Transition: 250 MHz
Package / Case: SOT-23-3

Similar Alternatives share the same package and operating temperature range but differ in one or more electrical parameters (collector current, breakdown voltage, or transition frequency). These parts are suitable only when the application tolerates the specified parameter variations.

Parameter Comparison

Part Number	Manufacturer	Ic (Max)	Vce(BR)	Vce Sat @ Ib, Ic	hFE (Min)	fT	Power (Max)	Status	Package
BSR18A_D87Z	onsemi	200 mA	40 V	400mV @ 5mA, 50mA	100 @ 10mA, 1V	250 MHz	350 mW	Obsolete	SOT-23-3
MMBT3906LT3G	onsemi	200 mA	40 V	400mV @ 5mA, 50mA	100 @ 10mA, 1V	250 MHz	300 mW	Active	SOT-23-3
SMMBT3906LT3G	onsemi	200 mA	40 V	400mV @ 5mA, 50mA	100 @ 10mA, 1V	250 MHz	300 mW	Active	SOT-23-3
MMBT3906LT1G	onsemi	200 mA	40 V	400mV @ 5mA, 50mA	100 @ 10mA, 1V	250 MHz	300 mW	Active	SOT-23-3
SMMBT3906LT1G	onsemi	200 mA	40 V	400mV @ 5mA, 50mA	100 @ 10mA, 1V	250 MHz	300 mW	Active	SOT-23-3
MMBT3906,215	NXP Semiconductors	200 mA	40 V	400mV @ 5mA, 50mA	100 @ 10mA, 1V	250 MHz	250 mW	Active	SOT-23-3
MMBT3906-7-F	Diodes Incorporated	200 mA	40 V	400mV @ 5mA, 50mA	100 @ 10mA, 1V	250 MHz	300 mW	Active	SOT-23-3
BC807-16LT1G	onsemi	500 mA	45 V	700mV @ 50mA, 500mA	100 @ 100mA, 1V	100 MHz	300 mW	Active	SOT-23-3
BC857BLT1G	onsemi	100 mA	45 V	650mV @ 5mA, 100mA	220 @ 2mA, 5V	100 MHz	300 mW	Active	SOT-23-3
BCW68GLT1G	onsemi	800 mA	45 V	1.5V @ 30mA, 300mA	120 @ 10mA, 1V	100 MHz	225 mW	Active	SOT-23-3
BCW70LT1G	onsemi	100 mA	45 V	300mV @ 500µA, 10mA	215 @ 2mA, 5V	Not specified	225 mW	Active	SOT-23-3

Engineering Selection Recommendations

Direct Equivalents (Recommended for Pin-Compatible Replacement)

The following parts provide direct electrical equivalence to the BSR18A_D87Z and are suitable for immediate substitution:

MMBT3906LT3G (onsemi): Active status, Cut Tape packaging, 300 mW power rating
SMMBT3906LT3G (onsemi): Active status, Tape & Reel packaging, AEC-Q101 automotive qualification, 300 mW power rating
MMBT3906LT1G (onsemi): Active status, Cut Tape packaging, highest inventory availability (608,935 pcs), 300 mW power rating
SMMBT3906LT1G (onsemi): Active status, Tape & Reel packaging, AEC-Q101 automotive qualification, 300 mW power rating
MMBT3906,215 (NXP Semiconductors): Active status, AEC-Q101 automotive qualification, 250 mW power rating
MMBT3906-7-F (Diodes Incorporated): Active status, AEC-Q101 automotive qualification, 300 mW power rating

All direct equivalents maintain identical collector current (200 mA), breakdown voltage (40 V), saturation voltage, DC current gain, and transition frequency (250 MHz) specifications. Selection among these parts depends on packaging preference (Cut Tape vs. Tape & Reel), automotive qualification requirements, and inventory availability.

Similar Alternatives (Application-Dependent Selection)

The following parts share the SOT-23-3 package and operating temperature range but exhibit parameter variations:

BC807-16LT1G: Higher collector current (500 mA) and breakdown voltage (45 V), lower transition frequency (100 MHz)
BC857BLT1G: Lower collector current (100 mA), higher breakdown voltage (45 V), higher DC current gain (220), lower transition frequency (100 MHz)
BCW68GLT1G: Significantly higher collector current (800 mA), higher breakdown voltage (45 V), lower transition frequency (100 MHz), reduced power rating (225 mW)
BCW70LT1G: Lower collector current (100 mA), higher breakdown voltage (45 V), higher DC current gain (215), reduced power rating (225 mW)

Similar alternatives are applicable only when the application circuit tolerates the specified electrical parameter deviations and does not require the 250 MHz transition frequency of the original part.

Frequently Asked Questions (FAQ)

Q: Can MMBT3906LT1G directly replace BSR18A_D87Z?

A: Yes. MMBT3906LT1G is a direct electrical equivalent with identical collector current (200 mA), breakdown voltage (40 V), saturation voltage, DC current gain, and transition frequency (250 MHz). Both use the SOT-23-3 package. The primary difference is product status: BSR18A_D87Z is obsolete while MMBT3906LT1G is active.

Q: What is the difference between MMBT3906LT3G and MMBT3906LT1G?

A: Both parts are electrically identical direct equivalents. The difference lies in packaging: MMBT3906LT3G is supplied in Cut Tape (CT) & Digi-Reel format, while MMBT3906LT1G is also supplied in Cut Tape format but with significantly higher inventory availability (608,935 pcs vs. 1,121 pcs).

Q: Should I use SMMBT3906LT3G or SMMBT3906LT1G for automotive applications?

A: Both SMMBT3906LT3G and SMMBT3906LT1G carry AEC-Q101 automotive qualification and are electrically identical. Selection depends on packaging preference and inventory requirements. SMMBT3906LT1G offers higher inventory availability (95,300 pcs vs. 8,420 pcs).

Q: Can BC857BLT1G replace BSR18A_D87Z?

A: BC857BLT1G is not a direct equivalent. While it shares the SOT-23-3 package and operating temperature range, it differs in collector current (100 mA vs. 200 mA), breakdown voltage (45 V vs. 40 V), DC current gain (220 vs. 100), and transition frequency (100 MHz vs. 250 MHz). Use only if the application circuit tolerates these parameter variations.

Q: What is the significance of the power rating difference between BSR18A_D87Z (350 mW) and MMBT3906LT3G (300 mW)?

A: The BSR18A_D87Z has a 350 mW maximum power dissipation rating, while direct equivalents such as MMBT3906LT3G are rated at 300 mW. For applications operating near the original 350 mW limit, verify that circuit conditions do not exceed 300 mW dissipation with the substitute part.

Q: Are NXP MMBT3906,215 and Diodes MMBT3906-7-F compatible with onsemi MMBT3906LT1G?

A: Yes. All three parts are direct electrical equivalents with identical collector current (200 mA), breakdown voltage (40 V), saturation voltage, DC current gain, and transition frequency (250 MHz). Both NXP and Diodes versions carry AEC-Q101 automotive qualification. Selection depends on supplier availability and procurement requirements.

Q: Why do some substitute parts have lower transition frequencies (100 MHz vs. 250 MHz)?

A: Parts such as BC807-16LT1G, BC857BLT1G, BCW68GLT1G, and BCW70LT1G are designed for different application requirements. The 100 MHz transition frequency is suitable for lower-frequency switching and amplification circuits. Use these parts only if the application does not require the 250 MHz performance of the original BSR18A_D87Z.

Q: What does AEC-Q101 qualification mean for automotive applications?

A: AEC-Q101 is an automotive electronics qualification standard. Parts carrying this qualification (such as SMMBT3906LT3G, SMMBT3906LT1G, MMBT3906,215, and MMBT3906-7-F) have undergone rigorous testing for reliability and performance in automotive environments. Use AEC-Q101 qualified parts for automotive applications requiring this certification.

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