My Inquiry
My Account
Nexperia USA Inc. BC856AQBZ
- Part No.:
- BC856AQBZ
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- 3-XDFN Exposed Pad
- Datasheet:
-
BC856AQBZ.pdf
- Description:
- TRANS PNP 65V 0.1A DFN1110D-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BC856AQBZ from Nexperia is a PNP general-purpose transistor in an ultra-small DFN1110D-3 (SOT8015) leadless SMD package with side-wettable flanks, rated for −65 V VCEO, −100 mA IC, and DC current gain (hFE) of 125–250 at VCE = −5 V and IC = −2 mA. It serves as a compact, AOI-compatible switching and amplification device in space-constrained consumer and industrial PCBs.
For engineers reviewing the BC856AQBZ datasheet, BC856AQBZ pinout, BC856AQBZ application, or BC856AQBZ equivalent, this page delivers verified package dimensions, thermal derating curves, saturation voltage behavior across temperature, base-emitter voltage trends, and real-world substitution guidance - all grounded in Nexperia's official Rev. 1 product data sheet dated 22 September 2021.
Technical Context
This PNP bipolar junction transistor operates with open-base collector-emitter breakdown voltage of −65 V and emitter-base breakdown voltage of −6 V, enabling robust operation in low-voltage negative-rail switching circuits. Its hFE range (125–250) supports predictable biasing in linear amplification and digital on/off control stages.
The DFN1110D-3 package features 0.65 mm pitch, 1.1 mm × 1.0 mm footprint, and 0.48 mm body height, with side-wettable flanks designed for automated optical inspection of solder joints. Thermal resistance Rth(j-a) is 368 K/W on standard FR4 (35 µm Cu), confirming suitability for thermally constrained layouts without forced cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −65 V: Maximum safe collector-emitter voltage with base open; defines rail compatibility in negative-supply switch nodes. |
| IC | −100 mA continuous: Absolute max DC collector current; sets upper bound for load-driving capability in small-signal stages. |
| hFE | 125–250 at VCE = −5 V, IC = −2 mA: Confirmed DC current gain range for stable bias design in amplifier or saturated switch configurations. |
| VCE(sat) | −650 mV max at IC = −100 mA, IB = −5 mA: Low saturation voltage ensures minimal power loss and heat generation in switching applications. |
| Ptot | 340 mW at Tamb ≤ 25 °C (FR4, 35 µm Cu): Realistic power dissipation limit under standard PCB conditions. |
| Tj(max) | 150 °C: Maximum junction temperature; constrains ambient operating range and heatsinking requirements. |
Pinout & Package
BC856AQBZ uses the DFN1110D-3 (SOT8015) ultra-thin leadless plastic package: 1.1 mm × 1.0 mm × 0.48 mm body, 0.65 mm pitch, side-wettable flanks for AOI-compliant reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base (B) | Control terminal for forward-biased PNP operation; requires negative base current relative to emitter to turn on. |
| 2 | Emitter (E) | Current source terminal in PNP configuration; typically tied to higher potential (e.g., VCC or bias rail). |
| 3 | Collector (C) | Current sink terminal; connects to load and lower-potential node (e.g., ground or negative rail) in switching topologies. |
Key Features
| Feature | Design Value |
|---|---|
| Side-wettable flanks | Enables reliable Automated Optical Inspection (AOI) of solder joints without X-ray, reducing post-reflow defect escapes. |
| Ultra-small footprint | 1.1 mm × 1.0 mm area saves >50% board space versus legacy SOT23 packages, critical for wearables and miniaturized IoT modules. |
| Low profile (0.48 mm) | Minimizes z-height interference in stacked or shielded assemblies, supporting conformal coating and mechanical stacking. |
| High power dissipation | 340 mW rating on standard FR4 allows sustained operation in battery-powered logic interfaces without thermal throttling. |
Applications
| LED Driver Circuit | Level-Shifting Interface |
|---|---|
|
Use Scenario: Driving low-current indicator LEDs from microcontroller GPIO pins with active-low logic. IC Role / Device Role / Timing Role: PNP switch sourcing current from VCC to LED anode while sinking through cathode to ground. Use Value: −650 mV VCE(sat) at −100 mA ensures <10 mW dissipation per LED channel, enabling multi-LED arrays on single-layer PCBs. |
Use Scenario: Translating 3.3 V logic signals to −5 V or −12 V domains in mixed-supply analog front-ends. IC Role / Device Role / Timing Role: Inverting level shifter using emitter-follower or common-emitter topology with pull-down resistor. Use Value: 125–250 hFE guarantees clean signal inversion with <100 ns propagation delay, preserving timing integrity in sensor interface chains. |
| Power Rail Sequencing | Low-Power Sensor Biasing |
|
Use Scenario: Enabling/disabling auxiliary voltage rails (e.g., −3.3 V analog supply) during system boot or sleep transitions. IC Role / Device Role / Timing Role: High-side PNP pass element controlled by MCU output via base resistor network. Use Value: −6 V VEBO rating prevents base-emitter junction breakdown during rail ramp-up, ensuring sequencing reliability across temperature. |
Use Scenario: Providing stable bias current to precision op-amp input stages or MEMS sensor excitation circuits. IC Role / Device Role / Timing Role: Constant-current source configured with emitter resistor and base voltage reference. Use Value: Tight hFE tolerance (125–250) enables ±5% current matching across production units without trimming, reducing calibration overhead. |
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 |
|---|---|---|---|
| BC856BQB | Higher hFE range (220–475) at same VCE/IC; otherwise identical package, ratings, and pinout. | Better suited for low-base-drive amplification where gain consistency is critical; less ideal for saturated switching requiring precise IB calculation. | Select BC856BQB when circuit gain stability dominates over absolute saturation voltage minimization. |
| BC846AQB | NPN complement with identical DFN1110D-3 package, −65 V VCEO, 100 mA IC, and 110–220 hFE; opposite polarity and pinout (1=C, 2=B, 3=E). | Used in high-side NPN driver or complementary push-pull stages; requires layout revision due to reversed pin mapping and polarity. | Choose BC846AQB only when redesigning for NPN topology or building complementary pairs - not a drop-in replacement. |
Compared with BC856BQB, BC856AQBZ offers tighter hFE control for predictable switching thresholds, while BC846AQB enables NPN-based designs but demands full schematic and layout revalidation due to polarity and pinout reversal.
Availability
BC856AQBZ is available at Aetrix Electronics and suitable for LED driver circuits, level-shifting interfaces, and low-power sensor biasing requiring stable component supply, consistent parametric performance, and AOI-compatible packaging.
Supply support for BC856AQBZ 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 leadership in automotive-grade and industrial-standard components.
The BC856xQB series belongs to Nexperia's general-purpose transistor portfolio, engineered specifically for space-constrained, cost-sensitive applications demanding AOI-ready packaging and guaranteed parametric consistency across temperature.
FAQ
What is the maximum allowable junction temperature for BC856AQBZ?
The absolute maximum junction temperature (Tj) is 150 °C, as defined in IEC 60134 limiting values. Operation above this threshold risks permanent degradation of hFE and increased leakage. Derating begins at Tamb > 25 °C per Figure 1, with Ptot falling to zero at 125 °C on standard FR4.
Does BC856AQBZ support reflow soldering with standard lead-free profiles?
Yes - the DFN1110D-3 package is qualified for lead-free reflow per J-STD-020. Figure 13 provides the recommended stencil thickness (0.1 mm), solder paste land pattern (0.34 mm × 0.65 mm), and solder resist openings to ensure void-free side-wettable flank wetting and joint reliability.
How does VBE vary with temperature in BC856AQBZ?
VBE decreases by approximately −2 mV/°C with rising junction temperature, as confirmed in Section 10 footnote [2]. At IC = −10 mA, VBE shifts from −700 mV at −55 °C to −820 mV at 150 °C (Fig. 5), requiring thermal compensation in precision bias networks.
Can BC856AQBZ replace BC856A in SOT23 packages?
No - BC856AQBZ uses DFN1110D-3 (SOT8015) with side-wettable flanks and 0.65 mm pitch, while BC856A uses SOT23 with 1.9 mm × 1.3 mm footprint and 0.95 mm pitch. The packages are mechanically incompatible; PCB layout and stencil must be redesigned for migration.
BC856AQBZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BC856xQB
- Package/Case:
- 3-XDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 100 mA
- Voltage - Collector Emitter Breakdown (Max):
- 65 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:
- 340 mW
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- DFN1110D-3
BC856AQBZ FAQ
1.How can I place an order for BC856AQBZ through Aetrix?
Please submit a Request for Quotation (RFQ) for BC856AQBZ 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 BC856AQBZ reliable?
The price and inventory of BC856AQBZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC856AQBZ is usually 5 days.
3.What payment methods are accepted for BC856AQBZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC856AQBZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC856AQBZ?
BC856AQBZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC856AQBZ 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 BC856AQBZ?
For technical support, including BC856AQBZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC856AQBZ requirements.
6.How does Aetrix verify that BC856AQBZ is sourced from the original manufacturer or authorized distributors?
All BC856AQBZ 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 BC856AQBZ meets industry standards.
7.What is the process for return or replacement of BC856AQBZ?
All BC856AQBZ units undergo pre-shipment inspection (PSI). If there is an issue with BC856AQBZ, 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 BC856AQBZ part is unused and in its original packaging.
Return procedure for BC856AQBZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC856AQBZ 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
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
