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Diodes Incorporated MMBT3906FA-7B
- Part No.:
- MMBT3906FA-7B
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- 3-XFDFN
- Datasheet:
-
MMBT3906FA-7B.pdf
- Description:
- TRANS PNP 40V 0.2A X2-DFN0806-3
- Quantity:
- Payment:
- Shipping:
Inventory:19,432
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Product details
Overview
MMBT3906FA-7B from Diodes Incorporated is a 40V PNP small-signal transistor in X2-DFN0806-3 package, rated for −200mA continuous collector current and 435mW power dissipation. It features −40V VCEO, 300MHz fT, and AEC-Q101 qualification for automotive-grade reliability. Used in compact biasing, switching, and level-shifting circuits where low profile (0.4mm height) and high-density layout are critical.
For engineers reviewing the MMBT3906FA-7B datasheet, MMBT3906FA-7B pinout, MMBT3906FA-7B application, or MMBT3906FA-7B equivalent, key selection criteria include its DFN0806 footprint compatibility, complementary pairing with MMBT3904FA, thermal resistance (RθJA = 287°C/W), and −6.0V VEBO for robust base-emitter protection.
Technical Context
This PNP bipolar junction transistor operates in active, saturation, and cutoff regions with verified DC current gain (hFE) ranging from 60 to 300 across −100µA to −100mA collector currents. Its 300MHz transition frequency and 10pF input capacitance support medium-speed digital switching and analog amplification up to ~100MHz.
The device uses NiPdAu-plated terminals on a green molding compound (UL 94V-0), with moisture sensitivity level 1 and junction-to-lead thermal resistance of 150°C/W-enabling direct thermal coupling via the exposed collector pad. It is not a logic-level or power transistor but optimized for signal-level control in space-constrained PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −40V: Maximum safe collector-emitter voltage before breakdown under open-base conditions. |
| IC (cont.) | −200mA: Continuous collector current rating defining maximum steady-state load drive capability. |
| PD | 435mW: Power dissipation limit on standard 1oz FR4 PCB with full collector pad heatsinking. |
| fT | 300MHz: Transition frequency indicating usable bandwidth for small-signal amplification or fast switching. |
| VCE(sat) | −0.25V @ IC=−10mA/IB=−1mA: Low saturation voltage enabling efficient switching with minimal conduction loss. |
| hFE | 60–300: DC current gain range confirming predictable base drive requirements across operating current. |
| RθJA | 287°C/W: Junction-to-ambient thermal resistance under defined PCB layout-critical for thermal margin calculation. |
Pinout & Package
Package: X2-DFN0806-3 - ultra-compact 0.6mm × 0.8mm footprint, 0.4mm height, with exposed collector pad for thermal management. Molded plastic case meets UL 94V-0; terminals plated with NiPdAu for solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Emitter terminal | Current exit path; marked by bar on top view; connects to ground or low-side reference in PNP switch configurations. |
| 2 (Base) | Control terminal | Current-controlled input; requires negative base current relative to emitter to turn on; drives switching or bias networks. |
| 3 (Collector) | Collector terminal | Current entry path; electrically connected to exposed metal pad on bottom surface for thermal and electrical conduction. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control modules and body electronics requiring high-reliability discrete transistors. |
| 0.48mm² footprint | 16× smaller than SOT-23-enables high-density routing in portable, wearables, and multi-rail PMIC support circuits. |
| Exposed collector pad | Thermal resistance RθJL = 150°C/W enables direct PCB copper pour attachment for improved heat transfer in thermally constrained layouts. |
| Green, halogen-free | Meets <900ppm Br/Cl and <1000ppm Sb; compliant with RoHS 2 and JEDEC J-STD-020 Level 1 moisture sensitivity. |
Applications
| Automotive Body Control Module | Portable Device Power Sequencing |
|---|---|
Use Scenario: Controlling LED status indicators and relay drivers in door modules and lighting control units. IC Role / Device Role / Timing Role: PNP switch providing inverted logic-level interface between MCU GPIO and 12V loads. Use Value: −40V VCEO withstands automotive load-dump transients; AEC-Q101 qualification ensures long-term reliability at 125°C ambient. |
Use Scenario: Enabling/disabling auxiliary rails (e.g., display backlight, sensor bias) during boot-up and sleep states. IC Role / Device Role / Timing Role: Low-leakage PNP pass element used in discrete power-gating circuits. Use Value: −50nA ICEX minimizes standby current; 0.4mm height allows stacking under thin-film shields in smartphones and earbuds. |
| Industrial Sensor Signal Conditioning | USB-C Port Protection Logic |
Use Scenario: Biasing op-amp input stages and level-shifting analog sensor outputs (e.g., thermistor bridges) to ADC inputs. IC Role / Device Role / Timing Role: Active-load or current-source element in precision analog front-ends. Use Value: hFE stability over −55°C to +150°C ensures consistent gain matching; 10pF Cibo avoids signal distortion at kHz-range frequencies. |
Use Scenario: Implementing CC line pull-up/pull-down logic for USB-C port configuration detection and orientation sensing. IC Role / Device Role / Timing Role: Fast-switching PNP driver controlling dual-direction pull resistors per USB-C specification. Use Value: 35ns rise/fall time meets USB-C 2.0 timing budgets; −0.25V VCE(sat) ensures accurate voltage thresholds at 3.3V logic levels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP small-signal transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DMT3906LWQ-7 | Same X2-DFN0806-3 package; higher hFE min (100 vs. 60); lower VCE(sat) (−0.15V @ −10mA). | Preferred in high-gain, low-loss linear biasing; less suitable for high-current switching due to lower ICM (−400mA vs. −500mA). | Select when tighter hFE tolerance and lower saturation loss are prioritized over peak pulse current. |
| PNP2907A-7-F | SOT-23 package (larger footprint); higher VCEO (−60V); higher RθJA (350°C/W); no AEC-Q101 rating. | Used in legacy industrial designs where board space is less constrained and automotive qualification is not required. | Choose only for cost-sensitive, non-automotive applications where thermal performance and footprint size are secondary. |
Compared with DMT3906LWQ-7 and PNP2907A-7-F, MMBT3906FA-7B delivers optimal balance of automotive qualification, thermal efficiency via exposed pad, and proven performance in high-density portable and automotive PCBs-making it the preferred choice where space, reliability, and thermal management intersect.
Availability
MMBT3906FA-7B is available at Aetrix Electronics and suitable for automotive body electronics, portable device power sequencing, industrial sensor conditioning, and USB-C port logic requiring stable component supply and long-lifecycle support.
Supply support for MMBT3906FA-7B includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability components for automotive, industrial, and consumer markets.
The MMBT3906FA belongs to Diodes' AEC-Q101-qualified small-signal transistor family, engineered for space-constrained, thermally demanding applications where traditional SOT packages cannot meet density or thermal goals.
FAQ
What is the maximum operating temperature for MMBT3906FA-7B?
The MMBT3906FA-7B has a specified operating junction temperature range of −55°C to +150°C. Its storage temperature matches this range. Derating begins above +25°C ambient per the published power dissipation curve-maximum power drops linearly to zero at +150°C ambient when mounted on the recommended 1oz copper pad layout.
Is MMBT3906FA-7B pin-compatible with standard SOT-23 PNP transistors?
No-MMBT3906FA-7B uses the X2-DFN0806-3 package with three terminals in a 0.6mm × 0.8mm outline and an exposed collector pad, differing fundamentally from SOT-23's 3.0mm × 1.4mm body and leaded construction. PCB layout, thermal design, and reflow profiles must be adapted specifically for DFN0806.
Does MMBT3906FA-7B require special handling for ESD sensitivity?
It is rated to JEDEC Class 3A HBM (4,000V) and Class B MM (200V). While robust for general assembly, handling during manual prototyping or low-volume production should follow standard ESD protocols-grounded workstations, ionized air, and static-dissipative packaging-to prevent latent damage to the base-emitter junction.
Can MMBT3906FA-7B replace MMBT3906 in existing designs?
Only with layout revision: MMBT3906 uses SOT-23, while MMBT3906FA-7B uses DFN0806. Electrical parameters are closely matched (same VCEO, IC, hFE ranges), but thermal performance, footprint, and soldering process differ significantly. Migration requires updated land pattern, stencil design, and validation of thermal margin under real operating conditions.
MMBT3906FA-7B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 3-XFDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 200 mA
- Voltage - Collector Emitter Breakdown (Max):
- 40 V
- Vce Saturation (Max) @ Ib, Ic:
- 400mV @ 5mA, 50mA
- Current - Collector Cutoff (Max):
- 50nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 10mA, 1V
- Power - Max:
- 435 mW
- Frequency - Transition:
- 300MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- X2-DFN0806-3
MMBT3906FA-7B FAQ
1.How can I place an order for MMBT3906FA-7B through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBT3906FA-7B on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MMBT3906FA-7B reliable?
The price and inventory of MMBT3906FA-7B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBT3906FA-7B is usually 5 days.
3.What payment methods are accepted for MMBT3906FA-7B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBT3906FA-7B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBT3906FA-7B?
MMBT3906FA-7B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBT3906FA-7B order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MMBT3906FA-7B?
For technical support, including MMBT3906FA-7B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBT3906FA-7B requirements.
6.How does Aetrix verify that MMBT3906FA-7B is sourced from the original manufacturer or authorized distributors?
All MMBT3906FA-7B products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MMBT3906FA-7B meets industry standards.
7.What is the process for return or replacement of MMBT3906FA-7B?
All MMBT3906FA-7B units undergo pre-shipment inspection (PSI). If there is an issue with MMBT3906FA-7B, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MMBT3906FA-7B part is unused and in its original packaging.
Return procedure for MMBT3906FA-7B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBT3906FA-7B Tags
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MMBT3906LT1G
onsemi
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MMBT3904-7-F
Diodes Incorporated
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MMBT3904LT1G
onsemi
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MMBT3906-7-F
Diodes Incorporated
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MMBT3904-TP
Micro Commercial Co
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MMBT2222A-7-F
Diodes Incorporated
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BC846BLT1G
onsemi
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BC847B,215
Nexperia USA Inc.
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SMMBT3904LT1G
onsemi
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Micro Commercial Co
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MMBTA06LT1G
onsemi
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MMBT2222ALT1G
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