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Diodes Incorporated MMBTA55-7
- Part No.:
- MMBTA55-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBTA55-7.pdf
- Description:
- TRANS PNP 60V 0.5A SOT-23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,623
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Product details
Overview
MMBTA55-7 from Diodes Incorporated is a 60V PNP medium-power bipolar junction transistor in SOT23 package, rated for −500mA continuous collector current and 310mW power dissipation at TA = +25°C on minimum pad layout. It delivers hFE ≥ 100 at −10mA/−1.0V, VCE(sat) ≤ −0.25V at −100mA/−10mA drive, and fT = 50MHz, used in low-power amplification and switching circuits in industrial control I/O stages.
For engineers reviewing the MMBTA55-7 datasheet, MMBTA55-7 pinout, MMBTA55-7 application, or MMBTA55-7 equivalent, key selection criteria include verified PNP polarity, SOT23 terminal mapping (Emitter–Base–Collector), −60V VCEO rating, thermal derating behavior above 25°C, and complementary pairing with MMBTA05/06 for push-pull designs.
Technical Context
This PNP BJT operates in active or saturation mode for signal amplification and digital switching. Its epitaxial planar die construction ensures stable gain and low leakage, with ICBO ≤ −100nA at −60V VCB and BVEBO = −4.0V minimum.
Thermal performance is defined by RθJA = 403°C/W on minimal FR4 layout and RθJL = 350°C/W to solder point. ESD robustness includes 4kV HBM and 400V MM ratings per JEDEC standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −60V: Maximum safe collector-emitter voltage before breakdown in common-emitter configuration. |
| IC (cont.) | −500mA: Continuous DC collector current limit under specified thermal conditions. |
| hFE | ≥100 at −10mA/−1.0V: Sufficient DC gain for low-current switching and small-signal amplification stages. |
| VCE(sat) | ≤−0.25V at −100mA/−10mA: Low saturation voltage enables efficient switching with minimal conduction loss. |
| fT | 50MHz: Usable for audio-frequency amplification and fast digital switching up to ~10MHz practical bandwidth. |
| RθJA | 403°C/W: Thermal resistance defines maximum allowable power at ambient temperature without heatsinking. |
Pinout & Package
Package: SOT23 - surface-mount plastic package with matte tin-plated leads, UL 94V-0 rated, 0.008g weight, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current exit path for PNP device | Connected to higher potential rail in switching applications; base drive referenced to this node. |
| 2 (Base) | Control electrode for minority-carrier injection | Requires negative bias relative to emitter to turn on; typical drive current −10mA for full saturation. |
| 3 (Collector) | Current entry path and output terminal | Connected to load and lower potential (e.g., ground); handles −500mA continuous current. |
Key Features
| Feature | Design Value |
|---|---|
| Epitaxial planar die construction | Ensures repeatable hFE, low leakage (ICBO ≤ −100nA), and stable high-frequency response (fT = 50MHz). |
| Lead-free & RoHS 3 compliant | Fully compliant with EU Directive 2015/863/EU; no intentionally added lead, bromine & chlorine <900ppm each. |
| SOT23 mechanical compatibility | Standard footprint enables drop-in replacement in legacy designs using JEDEC MO-215 outline. |
| ESD robustness | 4kV HBM and 400V MM ratings reduce risk of handling damage during assembly and field operation. |
Applications
| Industrial Sensor Interface | LED Driver Stage |
|---|---|
Use Scenario: Amplifying low-level analog signals from RTDs or thermocouples before ADC input. IC Role / Device Role / Timing Role: PNP common-emitter amplifier providing inverted gain with low input impedance and rail-to-rail output swing capability. Use Value: hFE ≥ 100 at −10mA ensures adequate signal gain without external biasing complexity; −60V VCEO supports 24V industrial bus operation. | Use Scenario: Switching current through high-brightness LEDs in signage or status indicators. IC Role / Device Role / Timing Role: Low-side switch controlling LED anode connection to supply rail via emitter-follower or common-emitter topology. Use Value: VCE(sat) ≤ −0.25V minimizes power loss at 100–200mA drive currents; SOT23 footprint allows dense PCB layout. |
| Relay Driver Circuit | Complementary Pair Amplifier |
Use Scenario: Driving coil current for 5–12V electromagnetic relays in PLC output modules. IC Role / Device Role / Timing Role: PNP switch sinking relay coil current when base is pulled low; provides isolation between logic and inductive load. Use Value: −500mA IC rating exceeds typical relay coil requirements (70–200mA); RθJA = 403°C/W allows operation without heatsink at ambient ≤ 50°C. | Use Scenario: Constructing Class-B or AB audio preamplifier stages with matched gain and offset. IC Role / Device Role / Timing Role: PNP half of complementary pair with NPN MMBTA05, enabling symmetrical push-pull output stage. Use Value: Complementary marking (K2G) and identical SOT23 footprint simplify layout; matched hFE and fT ensure balanced frequency response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP medium-power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BC807-40,115 (Nexperia) | Same SOT23, −45V VCEO, hFE = 250–600, PD = 300mW | Higher gain but lower voltage rating; less suitable for 24V+ industrial rails | Select when higher hFE is prioritized over voltage margin and system operates ≤ 20V. |
| PN2907A (ON Semiconductor) | TO-92 package, −60V VCEO, hFE = 100–300, PD = 400mW | Through-hole mounting only; higher power dissipation but incompatible with SMT-only lines | Choose for prototyping or low-volume through-hole assemblies requiring same voltage rating and higher thermal headroom. |
Compared with BC807-40 and PN2907A, MMBTA55-7 offers optimal balance of SMT compatibility, −60V rating, and proven reliability in automated industrial production-making it preferred for volume SMT deployments where board space and assembly yield are critical.
Availability
MMBTA55-7 is available at Aetrix Electronics and suitable for industrial sensor interfaces, LED driver stages, relay driver circuits, and complementary pair amplifiers requiring stable component supply across production lifecycles.
Supply support for MMBTA55-7 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 and manufacturing operations across Asia and the Americas.
The MMBTA55-7 belongs to Diodes' general-purpose bipolar transistor product line, engineered for cost-sensitive, high-reliability industrial and consumer applications requiring robust SMT-compatible PNP switching and amplification.
FAQ
What is the correct pinout orientation for MMBTA55-7 in SOT23?
The MMBTA55-7 uses standard SOT23 pinout: Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector, confirmed by top-view marking "K2G" and Diodes' official package drawing DS30054 Rev. 14–2. This matches JEDEC MO-215 and is consistent across all MMBTA-series transistors.
Can MMBTA55-7 replace MMBTA56-7 in a circuit?
No-MMBTA55-7 has −60V VCEO and VCB ratings, while MMBTA56-7 is rated for −80V. Substituting MMBTA55-7 in a −70V application risks premature breakdown. Both share identical package, gain, and saturation characteristics, but voltage rating is not interchangeable.
Is MMBTA55-7 qualified for automotive use?
No-MMBTA55-7 is not AEC-Q101 qualified. Diodes offers the automotive-compliant MMBTA55Q variant (separate datasheet) with extended temperature screening, enhanced ESD, and PPAP documentation for vehicle applications.
What is the maximum operating temperature for continuous operation?
The MMBTA55-7 has TJ,TSTG = −55°C to +150°C, but continuous operation at full IC = −500mA requires derating above +25°C. At +100°C ambient, maximum usable power drops to ~120mW per Figure 1 derating curve, limiting practical IC to ~200mA without forced cooling.
MMBTA55-7 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:
- Discontinued at Digi-Key
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 500 mA
- Voltage - Collector Emitter Breakdown (Max):
- 60 V
- Vce Saturation (Max) @ Ib, Ic:
- 250mV @ 10mA, 100mA
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 100mA, 1V
- Power - Max:
- 300 mW
- Frequency - Transition:
- 50MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
MMBTA55-7 FAQ
1.How can I place an order for MMBTA55-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBTA55-7 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 MMBTA55-7 reliable?
The price and inventory of MMBTA55-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBTA55-7 is usually 5 days.
3.What payment methods are accepted for MMBTA55-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBTA55-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBTA55-7?
MMBTA55-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBTA55-7 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 MMBTA55-7?
For technical support, including MMBTA55-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBTA55-7 requirements.
6.How does Aetrix verify that MMBTA55-7 is sourced from the original manufacturer or authorized distributors?
All MMBTA55-7 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 MMBTA55-7 meets industry standards.
7.What is the process for return or replacement of MMBTA55-7?
All MMBTA55-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMBTA55-7, 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 MMBTA55-7 part is unused and in its original packaging.
Return procedure for MMBTA55-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBTA55-7 Tags
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MMBT3906LT1G
onsemi
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MMBT3904-7-F
Diodes Incorporated
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MMBT3904LT1G
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BC846BLT1G
onsemi
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BC847B,215
Nexperia USA Inc.
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MMBTA06LT1G
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