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Nexperia USA Inc. BC857B/DG/B3,215
- Part No.:
- BC857B/DG/B3,215
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BC857B/DG/B3,215.pdf
- Description:
- TRANS PNP 45V 0.1A TO-236AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,422
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Product details
Overview
BC857B/DG/B3,215 from Nexperia is a PNP general-purpose bipolar junction transistor in SOT23 (TO-236AB) package, rated for −45 V VCEO, −100 mA IC, and 220–475 hFE at VCE = −5 V, IC = −2 mA. It serves as a low-voltage, low-current switching or amplification device in signal conditioning stages of industrial sensor interfaces and power management enable circuits.
For engineers reviewing the BC857B/DG/B3,215 datasheet, BC857B/DG/B3,215 pinout, BC857B/DG/B3,215 application, or BC857B/DG/B3,215 equivalent, key selection criteria include guaranteed DC current gain range, VCEO derating at elevated temperature, saturation voltage under defined IC/IB ratios, and thermal resistance on standard FR4 PCB layout.
Technical Context
This PNP BJT operates in active or saturation mode with base-emitter forward bias and collector-base reverse bias. Its hFE variation across IC (−0.1 mA to −100 mA) and temperature (−55 °C to +150 °C) is documented in Figures 6–9, enabling predictable gain modeling in linear amplifier or switch-driver designs.
VCE(sat) remains ≤ −650 mV at IC = −100 mA and IB = −5 mA (IC/IB = 20), while VBE(sat) reaches −850 mV under identical conditions - critical for calculating base drive requirements in high-side load switches.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −45 V: Maximum allowable collector-emitter voltage with open base; defines safe operating voltage headroom in PNP high-side switch configurations. |
| IC | −100 mA continuous: Absolute maximum DC collector current; sets upper limit for load-driving capability in discrete logic-level translators. |
| hFE | 220–475 at VCE = −5 V, IC = −2 mA: Guaranteed DC current gain range used to size base resistors for reliable saturation in switching applications. |
| VCE(sat) | ≤ −650 mV at IC = −100 mA, IB = −5 mA: Confirmed saturation voltage defining conduction loss and heat generation in on-state operation. |
| Rth(j-a) | 500 K/W on FR4 PCB (single-sided, 35 µm Cu): Junction-to-ambient thermal resistance used to calculate temperature rise under steady-state power dissipation. |
| Ptot | 250 mW at Tamb ≤ 25 °C: Total power dissipation limit determining maximum allowable I2R + VCEIC losses on standard layout. |
Pinout & Package
SOT23 (TO-236AB) surface-mount plastic package with 3 leads; dimensions per Figure 14: 2.9 mm × 1.3 mm × 1.0 mm (L × W × H), 0.95 mm lead pitch, gull-wing terminations.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base (B) | Control terminal accepting forward-biased current to enable conduction between emitter and collector; requires series resistor to limit IB per hFE target. |
| 2 | Emitter (E) | Current source terminal in PNP configuration; connected to higher potential rail (e.g., VCC) in high-side switch topologies. |
| 3 | Collector (C) | Current sink terminal delivering controlled output current to load; polarity must be observed (negative voltage relative to emitter). |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed hFE range | 220–475 ensures consistent base drive sizing across production lots without recalibration. |
| Low VCE(sat) | ≤ −650 mV at IC = −100 mA enables <100 mW conduction loss in compact space-constrained designs. |
| Standard SOT23 footprint | Compatible with automated pick-and-place and reflow soldering per IPC-7351B, reducing assembly cost and risk. |
| Thermal performance | 500 K/W Rth(j-a) on FR4 allows stable operation up to +85 °C ambient with ≤150 °C junction temperature. |
Applications
| Industrial Sensor Signal Conditioning | Microcontroller GPIO Level Translation |
|---|---|
|
Use Scenario: Amplifying weak analog signals from thermistors or photodiodes before ADC sampling in PLC input modules. IC Role / Device Role / Timing Role: PNP common-emitter amplifier stage providing inverted gain and impedance buffering. Use Value: Stable hFE over −40 °C to +85 °C ensures repeatable gain calibration without software compensation. |
Use Scenario: Converting 3.3 V microcontroller output to drive 5 V or 12 V relay coils or LED indicators. IC Role / Device Role / Timing Role: Low-side or high-side switch controlled by MCU GPIO with current-limited base drive. Use Value: Verified VCE(sat) ≤ −650 mV at full load guarantees <10% voltage drop across transistor during on-state. |
| Power Supply Enable Control | Discrete Logic Inversion |
|
Use Scenario: Enabling/disabling auxiliary 3.3 V or 5 V rails via PMOS gate control in multi-rail power architectures. IC Role / Device Role / Timing Role: High-side switch pulling PMOS gate to VIN when enabled; off-state leakage <100 nA. Use Value: VEBO = −5 V and IEBO < −100 nA ensure no unintended turn-on during standby or brown-out conditions. |
Use Scenario: Implementing NOT gates or signal inversion where integrated logic ICs are unavailable or over-specified. IC Role / Device Role / Timing Role: Common-emitter inverter with fixed bias network delivering rail-to-rail digital swing. Use Value: Transition frequency fT ≥ 100 MHz supports clean inversion of signals up to ~10 MHz without edge degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP general-purpose transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BC857B,115 | Same electrical specs and SOT23 package; differs only in tape-and-reel packaging (115 vs 215) and marking code (3F vs 3F% with site code). | No functional difference; suitable for identical circuit roles and layout. | Select based on preferred reel size (3,000 pcs vs 10,000 pcs) and procurement channel availability. |
| MMBT3906LT1G | VCEO = −40 V (5 V lower), hFE = 100–300 (narrower range), VCE(sat) ≤ −400 mV at IC = −50 mA (lower current rating). | Marginally lower voltage rating limits use in 48 V systems; tighter hFE reduces base resistor tolerance sensitivity. | Prefer for cost-sensitive consumer designs where −40 V rating suffices and tighter gain spread simplifies design margining. |
Compared with BC857B/DG/B3,215, BC857B,115 offers identical performance in a different packaging format, while MMBT3906LT1G trades 5 V VCEO headroom and wider hFE for lower VCE(sat) at reduced current - making it viable only where system voltage and gain stability requirements align.
Availability
BC857B/DG/B3,215 is available at Aetrix Electronics and suitable for industrial sensor interfaces, microcontroller GPIO translation, and power supply enable control requiring stable component supply and long-term obsolescence management.
Supply support for BC857B/DG/B3,215 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
Nexperia is a global semiconductor expert focused on high-volume, high-reliability discrete and logic devices, with core competencies in efficiency, miniaturization, and automotive-grade qualification.
The BC856/857/858 family targets cost-sensitive, space-constrained general-purpose analog and digital switching applications across industrial, computing, and consumer electronics - emphasizing manufacturability, thermal robustness, and parametric consistency.
FAQ
What is the maximum junction temperature for BC857B/DG/B3,215?
The absolute maximum junction temperature is 150 °C, as specified in Table 6. Operation above this limit risks permanent degradation of hFE and increased leakage currents. Derating is required above 25 °C ambient using the 500 K/W thermal resistance value and actual power dissipation.
Does BC857B/DG/B3,215 support automotive applications?
No - this part is explicitly marked non-automotive qualified in Revision History (Section 13). Nexperia offers separate −Q qualified variants (e.g., BC857B-Q) with extended temperature testing, AEC-Q101 stress validation, and PPAP documentation for automotive use.
How does the marking code "3F%" identify BC857B/DG/B3,215?
"3F%" is the top-side laser marking: "3F" denotes BC857B, and "%" is a placeholder for the manufacturing site code (e.g., "A" for Nijmegen, "B" for Bangkok). This matches Table 5 and confirms authenticity against Nexperia's official marking guide.
Can BC857B/DG/B3,215 replace BC857C in a circuit?
Only if hFE ≥ 420 is not required: BC857B has hFE = 220–475, while BC857C guarantees 420–800. Circuits relying on minimum gain >420 (e.g., low-base-drive amplifiers) may fail with BC857B; verify worst-case hFE at operating IC and temperature.
BC857B/DG/B3,215 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 125 @ 2mA, 5V
- Power - Max:
- 250 mW
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
BC857B/DG/B3,215 FAQ
1.How can I place an order for BC857B/DG/B3,215 through Aetrix?
Please submit a Request for Quotation (RFQ) for BC857B/DG/B3,215 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 BC857B/DG/B3,215 reliable?
The price and inventory of BC857B/DG/B3,215 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC857B/DG/B3,215 is usually 5 days.
3.What payment methods are accepted for BC857B/DG/B3,215?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC857B/DG/B3,215 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC857B/DG/B3,215?
BC857B/DG/B3,215 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC857B/DG/B3,215 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 BC857B/DG/B3,215?
For technical support, including BC857B/DG/B3,215 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC857B/DG/B3,215 requirements.
6.How does Aetrix verify that BC857B/DG/B3,215 is sourced from the original manufacturer or authorized distributors?
All BC857B/DG/B3,215 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 BC857B/DG/B3,215 meets industry standards.
7.What is the process for return or replacement of BC857B/DG/B3,215?
All BC857B/DG/B3,215 units undergo pre-shipment inspection (PSI). If there is an issue with BC857B/DG/B3,215, 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 BC857B/DG/B3,215 part is unused and in its original packaging.
Return procedure for BC857B/DG/B3,215:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC857B/DG/B3,215 Tags
-
MMBT3906LT1G
onsemi
-
MMBT3904-7-F
Diodes Incorporated
-
MMBT3904LT1G
onsemi
-
MMBT3906-7-F
Diodes Incorporated
-
MMBT3904-TP
Micro Commercial Co
-
MMBT2222A-7-F
Diodes Incorporated
-
BC846BLT1G
onsemi
-
BC847B,215
Nexperia USA Inc.
-
SMMBT3904LT1G
onsemi
-
MMBT2222A-TP
Micro Commercial Co
-
MMBTA06LT1G
onsemi
-
MMBT2222ALT1G
onsemi
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