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Diodes Incorporated BC857BLP-7
- Part No.:
- BC857BLP-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- 3-UFDFN
- Datasheet:
-
BC857BLP-7.pdf
- Description:
- TRANS PNP 45V 0.1A X1-DFN1006-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,752
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Product details
Overview
BC857BLP-7 from Diodes Incorporated is a 45V PNP small-signal transistor in X1-DFN1006-3 package, rated for −100mA collector current and 400mW power dissipation (on standard PCB), with DC current gain hFE of 220–475 at −2mA/−5V, used in low-power switching and amplification stages of portable power management and signal conditioning circuits.
For engineers reviewing the BC857BLP-7 datasheet, BC857BLP-7 pinout, BC857BLP-7 application, or BC857BLP-7 equivalent, key selection criteria include VCEO = −45V, hFE min = 220, VCE(sat) ≤ −300mV at −10mA/−0.5mA, thermal resistance RθJA = 310°C/W, and JEDEC-compliant AEC-Q qualified variants for automotive use.
Technical Context
This PNP bipolar junction transistor operates in active and saturation regions for linear amplification and digital switching. Its high hFE range (220–475) enables low-base-drive designs, while −45V VCEO rating supports rail-to-rail operation in 3.3V/5V/12V systems with margin against transients.
Thermal performance is defined by two RθJA values: 310°C/W on minimal 1oz copper and 120°C/W with 25mm × 25mm 2oz heatsink pad-directly tied to the exposed collector terminal's solderable NiPdAu finish and DFN footprint optimization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −45 V: Maximum allowable voltage between collector and emitter before breakdown; ensures safe operation in 36V automotive or 24V industrial rails with headroom. |
| hFE | 220–475 @ −2mA/−5V: High DC current gain reduces required base drive current, lowering MCU GPIO loading in discrete switch applications. |
| VCE(sat) | −300 mV max @ −10mA/−0.5mA: Low saturation voltage minimizes conduction loss in load-switching and level-shifting circuits. |
| fT | 100 MHz: Gain-bandwidth product supports audio-frequency amplification and fast digital switching up to ~10MHz edge rates. |
| RθJA | 310 °C/W (min pad): Junction-to-ambient thermal resistance defines maximum power handling on compact PCB layouts without added copper. |
| ESD HBM | 4000 V: Human Body Model rating allows direct handling in non-ESD-controlled assembly environments without additional protection. |
Pinout & Package
Package: X1-DFN1006-3 - ultra-compact 1.0 × 0.6 mm, 0.5 mm height, thermally enhanced with exposed collector pad (pin 1), RoHS-compliant green molding compound, UL 94V-0 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Collector) | Current sink node with exposed thermal pad | Primary heat path to PCB; must be soldered to ≥1 oz copper pour for rated 400mW dissipation. |
| 2 (Emitter) | Current source terminal | Connected to higher potential rail in PNP switch configurations; referenced to base for bias control. |
| 3 (Base) | Control input for minority-carrier injection | Receives negative current to turn on; requires series resistor to limit IB per hFE and VBE(sat). |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small footprint | 0.60 mm² area-13× smaller than SOT-23-enables dense routing in space-constrained wearables and IoT sensors. |
| High reliability qualification | JEDEC-compliant for high-reliability applications; AEC-Q101 variants available for automotive under Q-suffix marking. |
| Low-profile packaging | 0.5 mm max height reduces mechanical interference in stacked-board or shielded assemblies. |
| Green material system | Halogen- and antimony-free (<900 ppm Br/Cl, <1000 ppm Sb); meets RoHS 3 and IEC 61249-2-21 standards. |
Applications
| Portable Power Switching | Level Translation |
|---|---|
Use Scenario: Enabling/disabling 3.3V peripherals (e.g., sensors, RF modules) from a 1.8V GPIO in battery-powered trackers. IC Role / Device Role / Timing Role: PNP load switch controlling VCC rail with inverted logic; base driven via current-limiting resistor. Use Value: VCE(sat) ≤ −300 mV ensures <10 mW conduction loss at 10 mA, extending battery life in sleep-mode duty cycles. |
Use Scenario: Translating 1.2V logic outputs to interface with 5V legacy analog front-ends in mixed-voltage medical monitors. IC Role / Device Role / Timing Role: Single-transistor level shifter operating in common-emitter configuration with pull-up resistor. Use Value: hFE ≥ 220 guarantees full saturation with sub-10 µA base current, minimizing drive burden on low-power MCUs. |
| Automotive Signal Conditioning | Industrial Sensor Interface |
Use Scenario: Amplifying thermistor or potentiometer signals in cabin temperature control modules within AEC-Q101-compliant ECUs. IC Role / Device Role / Timing Role: Linear amplifier in common-emitter topology with emitter degeneration resistor for stable gain. Use Value: fT = 100 MHz provides >10× bandwidth margin over 1 kHz sensor bandwidth, preserving signal fidelity. |
Use Scenario: Isolating 24V field inputs (e.g., proximity switches) from 3.3V PLC controller inputs in factory automation panels. IC Role / Device Role / Timing Role: Input stage in optocoupler-less isolation circuit using base-emitter clamping and collector pull-down. Use Value: VCEO = −45 V withstands 24V supply transients per ISO 7637-2 Pulse 1/2a, eliminating need for external TVS. |
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 |
|---|---|---|---|
| BC857B,115 (Nexperia) | SOT-323 package (2.1 × 1.25 mm); RθJA = 300°C/W; hFE = 200–450; same VCEO/IC ratings. | Larger footprint limits use in ultra-dense layouts; better thermal relief in hand-soldered prototypes. | Select when board rework or manual assembly is required; avoid if space budget is <1.0 mm². |
| DXT5551-7 (Diodes Inc.) | DFN1006-3 package; VCEO = −60 V; hFE = 100–300; higher voltage rating but lower gain consistency. | Preferred in 48V telecom power sequencing where margin beyond −45V is critical. | Choose only if system transient immunity exceeds −45V; trade-off is reduced hFE stability at low IC. |
Compared with BC857B,115, BC857BLP-7 saves >80% board area and improves thermal coupling via exposed collector; versus DXT5551-7, it delivers tighter hFE distribution for precision biasing but sacrifices 15V voltage headroom.
Availability
BC857BLP-7 is available at Aetrix Electronics and suitable for portable power switching, level translation, automotive signal conditioning, and industrial sensor interface applications requiring stable component supply across high-mix, low-volume production runs.
Supply support for BC857BLP-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 centers and manufacturing facilities across Asia and the Americas.
The BC857BLP belongs to Diodes' high-reliability small-signal transistor family, engineered for space-constrained, thermally demanding applications in automotive, industrial, and consumer electronics where miniaturization and JEDEC compliance are mandatory.
FAQ
What is the maximum continuous collector current for BC857BLP-7?
The absolute maximum continuous collector current is −100 mA at TA = +25°C. Derating applies above 25°C per the RθJA value: at 70°C ambient, maximum usable IC drops to approximately −65 mA to maintain junction temperature below 150°C.
Can BC857BLP-7 replace BC857C in existing designs?
Yes, but with verification: BC857BLP-7 has hFE = 220–475 (B-grade), while BC857C specifies 420–800 (C-grade). Circuits relying on minimum hFE > 420 may require base resistor adjustment or layout review to ensure saturation under worst-case conditions.
Is the exposed collector pad electrically isolated from other terminals?
No-the exposed pad is internally connected to the collector (pin 1). It must be soldered to a PCB copper pour designated as the collector net; floating or grounding the pad will short the collector and destroy device functionality.
Does BC857BLP-7 meet AEC-Q101 requirements out of the box?
No-BC857BLP-7 is JEDEC-qualified for high reliability but not AEC-Q101 certified. Automotive-grade equivalents (e.g., BC857BLPQ-7) carry Q-suffix marking, undergo stress testing per AEC-Q101, and are produced in IATF 16949-certified facilities.
BC857BLP-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 3-UFDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 100 mA
- Voltage - Collector Emitter Breakdown (Max):
- 45 V
- Vce Saturation (Max) @ Ib, Ic:
- 650mV @ 5mA, 100mA
- Current - Collector Cutoff (Max):
- 15nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 220 @ 2mA, 5V
- Power - Max:
- 250 mW
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- X1-DFN1006-3
BC857BLP-7 FAQ
1.How can I place an order for BC857BLP-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BC857BLP-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 BC857BLP-7 reliable?
The price and inventory of BC857BLP-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC857BLP-7 is usually 5 days.
3.What payment methods are accepted for BC857BLP-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC857BLP-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC857BLP-7?
BC857BLP-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC857BLP-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 BC857BLP-7?
For technical support, including BC857BLP-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC857BLP-7 requirements.
6.How does Aetrix verify that BC857BLP-7 is sourced from the original manufacturer or authorized distributors?
All BC857BLP-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 BC857BLP-7 meets industry standards.
7.What is the process for return or replacement of BC857BLP-7?
All BC857BLP-7 units undergo pre-shipment inspection (PSI). If there is an issue with BC857BLP-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 BC857BLP-7 part is unused and in its original packaging.
Return procedure for BC857BLP-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC857BLP-7 Tags
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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