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Diodes Incorporated MMBT5551Q-7
- Part No.:
- MMBT5551Q-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBT5551Q-7.pdf
- Description:
- TRANS NPN 160V 0.6A SOT-23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,984
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Product details
Overview
MMBT5551Q-7 from Diodes Incorporated is an AEC-Q101 qualified 160V NPN small-signal bipolar junction transistor in SOT23 package, rated for 600mA continuous collector current and 300mW power dissipation, with DC current gain (hFE) of 80–250 at 1–50mA and VCE(sat) ≤ 0.20V at 50mA/5mA drive, used in automotive low-power switching and amplification circuits.
For engineers reviewing the MMBT5551Q-7 datasheet, MMBT5551Q-7 pinout, MMBT5551Q-7 application, or MMBT5551Q-7 equivalent, this page delivers verified electrical parameters, automotive qualification status, thermal derating behavior, SOT23 terminal mapping, and direct-fit alternatives for high-reliability signal control designs.
Technical Context
This NPN BJT operates as a linear amplifier or saturated switch in automotive subsystems, supporting VCEO = 160V and VCBO = 180V with ESD robustness (4kV HBM). Its fT = 100–300MHz enables RF-coupled preamplifier use, while hfe = 50–250 at 1mA/10V ensures stable small-signal gain across temperature.
Thermal resistance RθJA = 417°C/W reflects performance on minimal FR4 pad layout; derating begins above 25°C ambient per Fig. 1, and moisture sensitivity level is J-STD-020 Level 1 - suitable for standard reflow without baking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 160V - supports high-side switching in 48V automotive loads and flyback snubber circuits |
| IC (cont.) | 600mA - drives relays, LEDs, or logic-level gate buffers without external heat sinking |
| PD | 300mW - limits usable duty cycle in pulsed switching above 75°C ambient |
| hFE | 80–250 - provides predictable base drive sizing across production lots and temperature range |
| fT | 100–300MHz - enables audio preamp and low-noise IF amplification up to 100MHz |
| ESD HBM | 4,000V - withstands handling in non-ESD-controlled assembly environments |
Pinout & Package
SOT23 plastic package with matte tin-plated leads, UL 94V-0 flammability rating, 0.008g mass, and J-STD-020 Level 1 moisture sensitivity. Dimensions: 2.90 × 1.30 × 0.40 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current sink node | Connected to ground or low-impedance return path; voltage drop < 0.1V at 50mA |
| 2 (Base) | Control input | Requires 1–5mA drive for saturation; VBE(sat) = 1.0V max at 50mA IC |
| 3 (Collector) | Current source node | Handles up to 160V reverse bias; Cobo = 6.0pF at 10V affects high-frequency stability |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive underhood and cabin applications with PPAP documentation support |
| VCEO > 160V | Enables use in 48V battery systems and transient-tolerant load switches |
| Green compound (halogen/antimony-free) | Meets automotive OEM material declarations: Br+Cl < 1500ppm, Sb < 1000ppm |
| Low VCE(sat) | 0.15V typical at 10mA/1mA ensures < 1.5mW conduction loss in always-on bias networks |
Applications
| Automotive Door Module | Industrial Sensor Interface |
|---|---|
Use Scenario: Driving window lift motor enable logic and LED status indicators in door control units. IC Role / Device Role / Timing Role: NPN switch controlling 12V/24V loads with fast turn-off (< 100ns) and low standby current. Use Value: VCEO = 160V prevents breakdown during load dump transients; RθJA = 417°C/W allows operation at 105°C ambient. | Use Scenario: Amplifying millivolt-level thermocouple or bridge sensor outputs in PLC analog input modules. IC Role / Device Role / Timing Role: Low-noise common-emitter preamplifier stage with nf ≤ 8.0dB at 1kHz. Use Value: hFE ≥ 80 at 1mA ensures stable gain over -40°C to +125°C; fT > 100MHz supports anti-alias filtering up to 10MHz. |
| LED Driver for Headlamp Control | Power Supply Feedback Transistor |
Use Scenario: Switching high-brightness LED strings in adaptive front-lighting systems (AFS). IC Role / Device Role / Timing Role: Saturated switch operating at 100–500Hz PWM with < 0.2V dropout. Use Value: VCE(sat) ≤ 0.20V at 50mA reduces thermal load in confined headlamp housings; AEC-Q101 ensures reliability over 15-year vehicle life. | Use Scenario: Isolating optocoupler feedback signals in isolated DC-DC converters for industrial power supplies. IC Role / Device Role / Timing Role: Linear amplifier translating error voltage to optocoupler LED current. Use Value: hFE = 80–250 enables precise current mirroring; Cobo = 6.0pF minimizes phase shift in 500kHz control loops. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN switching and amplification applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBT5551 (non-Q version) | Not AEC-Q101 qualified; same electrical specs but no automotive change control or PPAP support | Restricted to commercial/industrial use; not approved for automotive production BOMs | Select when cost sensitivity outweighs automotive compliance requirements |
| ZTX653 | Higher VCEO = 200V, higher PD = 500mW, TO-92 package (larger footprint) | Used where higher voltage margin or thermal headroom is needed; incompatible with SOT23 board space | Choose for non-automotive 200V switching where PCB real estate permits TO-92 |
Compared with MMBT5551Q-7, the MMBT5551 lacks automotive qualification and traceability, while ZTX653 trades SOT23 compatibility for higher voltage and power - making the Q-7 variant optimal for space-constrained, AEC-compliant automotive signal control.
Availability
MMBT5551Q-7 is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, and LED driver circuits requiring stable component supply, full traceability, and AEC-Q101 compliance.
Supply support for MMBT5551Q-7 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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
The MMBT5551Q belongs to Diodes' automotive-qualified small-signal transistor product line, engineered specifically for high-voltage, high-reliability switching and amplification in harsh-temperature automotive environments.
FAQ
What is the maximum operating temperature for MMBT5551Q-7?
The MMBT5551Q-7 has an operating junction temperature range of –55°C to +150°C, with thermal resistance RθJA = 417°C/W on standard FR4 PCB. Derating begins at 25°C ambient; at 100°C ambient, maximum allowable power drops to ~180mW per Fig. 1.
Is MMBT5551Q-7 pin-compatible with MMBT5401?
No - MMBT5551Q-7 is an NPN transistor with emitter-base-collector pinout (1-E, 2-B, 3-C), while MMBT5401 is its complementary PNP counterpart with reversed polarity and identical SOT23 pin assignment (1-E, 2-B, 3-C), requiring circuit topology changes for substitution.
Does MMBT5551Q-7 require special handling for moisture sensitivity?
No - it is rated J-STD-020 Level 1, meaning it can be stored indefinitely at ≤30°C/60% RH and processed using standard reflow profiles without baking or dry-pack requirements.
Can MMBT5551Q-7 be used in linear amplifier configurations?
Yes - with hfe = 50–250 at 1mA/10V and noise figure ≤ 8.0dB at 1kHz, it is suitable for low-noise preamplifiers in sensor signal chains, provided VCE is biased between 1–10V and collector current remains within 0.1–10mA for optimal linearity.
MMBT5551Q-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 600 mA
- Voltage - Collector Emitter Breakdown (Max):
- 160 V
- Vce Saturation (Max) @ Ib, Ic:
- 200mV @ 5mA, 50mA
- Current - Collector Cutoff (Max):
- 50nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 80 @ 10mA, 5V
- Power - Max:
- 300 mW
- Frequency - Transition:
- 300MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MMBT5551Q-7 FAQ
1.How can I place an order for MMBT5551Q-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBT5551Q-7 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 MMBT5551Q-7 reliable?
The price and inventory of MMBT5551Q-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBT5551Q-7 is usually 5 days.
3.What payment methods are accepted for MMBT5551Q-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBT5551Q-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBT5551Q-7?
MMBT5551Q-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBT5551Q-7 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 MMBT5551Q-7?
For technical support, including MMBT5551Q-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBT5551Q-7 requirements.
6.How does Aetrix verify that MMBT5551Q-7 is sourced from the original manufacturer or authorized distributors?
All MMBT5551Q-7 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 MMBT5551Q-7 meets industry standards.
7.What is the process for return or replacement of MMBT5551Q-7?
All MMBT5551Q-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMBT5551Q-7, 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 MMBT5551Q-7 part is unused and in its original packaging.
Return procedure for MMBT5551Q-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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