MMBT3906 Equivalent & Substitute Parts

Part Overview

The MMBT3906 is a PNP bipolar junction transistor manufactured by onsemi, designed for general-purpose switching and amplification applications. This surface mount device operates at 40 V maximum collector-emitter breakdown voltage with a maximum collector current of 200 mA and transition frequency of 250 MHz. The component is classified as obsolete, necessitating identification of equivalent and substitute parts for ongoing production and maintenance applications. Equivalent alternatives maintain identical electrical and mechanical specifications while offering improved availability and active product status.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Current - Collector (Ic) Max	200	mA
Voltage - Collector Emitter Breakdown (Max)	40	V
Vce Saturation (Max) @ Ib, Ic	400 mV @ 5 mA, 50 mA	—
Current - Collector Cutoff (Max)	50	nA
DC Current Gain (hFE) Min @ Ic, Vce	100 @ 10 mA, 1 V	—
Power - Max	350	mW
Frequency - Transition	250	MHz
Operating Temperature	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the MMBT3906 are classified into three categories based on electrical and mechanical compatibility:

Upgrade Substitutes maintain all critical electrical parameters while offering improved product status or enhanced availability. These parts satisfy identical collector current (200 mA), collector-emitter breakdown voltage (40 V), transition frequency (250 MHz), and DC current gain (100 @ 10 mA, 1 V) specifications. Upgrade substitutes may feature reduced maximum power dissipation (330 mW versus 350 mW) or modified saturation voltage characteristics while remaining functionally equivalent for standard applications.

Similar Substitutes provide direct functional equivalence with identical electrical specifications and surface mount packaging. These parts maintain the same transistor type (PNP), current ratings, voltage ratings, frequency response, and gain characteristics. Similar substitutes may feature variations in maximum power dissipation (300 mW), saturation voltage (300 mV versus 400 mV), or collector cutoff current (100 µA versus 50 nA) that do not affect circuit performance in typical switching applications.

Parametric Equivalents deliver complete electrical and mechanical interchangeability with the original MMBT3906. These parts match all specified parameters including maximum power dissipation (350 mW), saturation voltage (400 mV @ 5 mA, 50 mA), and collector cutoff current (50 nA). Parametric equivalents are selected for applications requiring exact specification compliance and are available from multiple manufacturers with active product status.

Substitution eligibility is determined by the following key parameters:

Transistor Type: PNP
Maximum Collector Current: 200 mA
Maximum Collector-Emitter Breakdown Voltage: 40 V
Minimum DC Current Gain: 100 @ 10 mA, 1 V
Transition Frequency: 250 MHz
Surface Mount Package: SOT-23-3 or equivalent
RoHS3 Compliance

Parameter Comparison

Manufacturer Part Number	Manufacturer	Ic (Max) mA	Vce(br) (Max) V	Vce Sat (Max) mV	hFE (Min)	Frequency MHz	Power (Max) mW	Temp Range °C	Product Status	Packaging
MMBT3906	onsemi	200	40	400	100	250	350	-55 to 150	Obsolete	SOT-23-3
SMBT3906E6327HTSA1	Infineon Technologies	200	40	400	100	250	330	-55 to 150	Last Time Buy	PG-SOT23
MMBT3906-HF	Comchip Technology	200	40	300	100	250	300	-55 to 150	Active	SOT-23-3
MMBT3906-TP	Micro Commercial Co	200	40	400	100	250	300	-55 to 150	Active	SOT-23
MMST3906T146	Rohm Semiconductor	200	40	400	100	250	300	-55 to 150	Active	SMT3
MMBT3906-EVL	Venkel	200	40	400	100	250	350	-50 to 150	Active	SOT-23-3
SST3906T116	Rohm Semiconductor	200	40	400	100	250	350	-55 to 150	Active	SST3

Engineering Selection Recommendations

Primary Selection: MMBT3906-TP (Micro Commercial Co)

The MMBT3906-TP is the recommended substitute for new designs and production applications. This part maintains identical electrical specifications to the original MMBT3906, including 200 mA maximum collector current, 40 V collector-emitter breakdown voltage, 400 mV saturation voltage, and 250 MHz transition frequency. The device carries active product status with extensive inventory availability (464,200 pieces), ensuring supply chain continuity. ROHS3 compliance and unlimited moisture sensitivity level (MSL 1) certification align with the original component specifications. The part is supplied in Tape & Reel packaging suitable for automated assembly processes.

Secondary Selection: SST3906T116 (Rohm Semiconductor)

The SST3906T116 provides complete parametric equivalence with the original MMBT3906, matching all electrical specifications including 350 mW maximum power dissipation and 400 mV saturation voltage. This device is manufactured by Rohm Semiconductor with active product status and maintains ROHS3 compliance. The SST3 package variant is mechanically compatible with SOT-23-3 footprints. Inventory availability of 10,087 pieces supports production requirements.

Tertiary Selection: MMBT3906-EVL (Venkel)

The MMBT3906-EVL delivers parametric equivalence with identical electrical performance and 350 mW power rating. This part is supplied by Venkel with active product status and extensive inventory (30,825 pieces). The device operates across -50°C to 150°C temperature range, providing coverage for the original -55°C to 150°C specification with a 5°C offset at the lower temperature extreme. ROHS3 compliance and unlimited MSL rating are maintained.

Alternative Selection: MMBT3906-HF (Comchip Technology)

The MMBT3906-HF is suitable for applications where reduced saturation voltage (300 mV) provides performance benefits. This part maintains identical collector current, voltage, and frequency specifications while reducing maximum power dissipation to 300 mW. Active product status and ROHS3 compliance are confirmed. The device is available in Tape & Reel packaging with 3,200 pieces in inventory.

All recommended substitutes are ROHS3 compliant, carry unlimited moisture sensitivity level (MSL 1) ratings, and are classified as REACH Unaffected. Selection among these alternatives depends on specific application requirements regarding power dissipation, saturation voltage characteristics, and packaging format preferences.

Frequently Asked Questions (FAQ)

Q: Can MMBT3906-TP be used as a direct replacement for MMBT3906 in existing designs?

A: Yes. The MMBT3906-TP maintains identical electrical specifications including collector current (200 mA), collector-emitter breakdown voltage (40 V), saturation voltage (400 mV @ 5 mA, 50 mA), DC current gain (100 @ 10 mA, 1 V), and transition frequency (250 MHz). The device is packaged in SOT-23 format compatible with SOT-23-3 footprints. No circuit modifications are required.

Q: What is the difference between MMBT3906-HF and MMBT3906-TP?

A: The primary difference is saturation voltage. MMBT3906-HF specifies 300 mV maximum saturation voltage compared to 400 mV for MMBT3906-TP. Both devices maintain identical collector current (200 mA), voltage ratings (40 V), and frequency response (250 MHz). MMBT3906-HF maximum power dissipation is 300 mW versus 300 mW for MMBT3906-TP. The reduced saturation voltage in MMBT3906-HF may provide improved switching performance in low-voltage applications.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification. The original MMBT3906 is also ROHS3 compliant. All parts are REACH Unaffected and suitable for applications requiring environmental compliance.

Q: What packaging formats are available for MMBT3906 substitutes?

A: Substitute parts are available in multiple surface mount package variants: SOT-23-3 (MMBT3906-TP, MMBT3906-HF, MMBT3906-EVL), PG-SOT23 (SMBT3906E6327HTSA1), SMT3 (MMST3906T146), and SST3 (SST3906T116). All variants are mechanically compatible with standard SOT-23 footprints used in PCB designs. Packaging selection depends on supplier availability and assembly process requirements.

Q: Can MMBT3906-EVL be used in applications requiring -55°C minimum operating temperature?

A: MMBT3906-EVL specifies -50°C to 150°C operating temperature range, which does not extend to the -55°C minimum of the original MMBT3906. For applications requiring -55°C operation, use MMBT3906-TP, MMBT3906-HF, or SST3906T116, which all specify -55°C minimum operating temperature.

Q: What is the difference between MMST3906T146 and MMBT3906-TP?

A: Both devices maintain identical electrical specifications for collector current (200 mA), voltage ratings (40 V), DC current gain (100 @ 10 mA, 1 V), and transition frequency (250 MHz). MMST3906T146 is packaged in SMT3 format while MMBT3906-TP uses SOT-23 format. Both packages are mechanically compatible with standard SOT-23 footprints. MMST3906T146 specifies 150°C maximum operating temperature compared to 150°C for MMBT3906-TP, with no minimum temperature specification provided.

Q: Is SMBT3906E6327HTSA1 suitable for new production designs?

A: SMBT3906E6327HTSA1 carries Last Time Buy product status, indicating the manufacturer is discontinuing production. While the part maintains electrical equivalence with the original MMBT3906 (200 mA, 40 V, 250 MHz), it is not recommended for new designs. Use MMBT3906-TP, SST3906T116, or MMBT3906-EVL for new production applications with active product status.

Q: What is the moisture sensitivity level (MSL) for all substitute parts?

A: All substitute parts carry MSL 1 (Unlimited) rating, identical to the original MMBT3906. This classification indicates unlimited shelf life without moisture bake requirements prior to soldering.

Q: Can substitute parts be mixed in the same production batch?

A: Yes. All substitute parts maintain identical electrical specifications and are ROHS3 compliant. However, different package variants (SOT-23, SMT3, SST3, PG-SOT23) require different PCB footprints. Within a single PCB design, use only one package variant to maintain assembly consistency.

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