My Inquiry
My Account
Nexperia USA Inc. BC857BW,135
- Part No.:
- BC857BW,135
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- SC-70, SOT-323
- Datasheet:
-
BC857BW,135.pdf
- Description:
- TRANS PNP 45V 0.1A SOT-323
- Quantity:
- Payment:
- Shipping:
Inventory:1,731
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BC857BW,135 from Nexperia is a PNP general-purpose bipolar junction transistor in SOT323 (SC-70) package, rated for −45 V VCEO, −100 mA IC, and DC current gain (hFE) of 220–475 at VCE = −5 V and IC = −2 mA. It serves as a low-voltage, low-current switching or amplification element in compact consumer and industrial signal-path circuits.
For engineers reviewing the BC857BW,135 datasheet, BC857BW,135 pinout, BC857BW,135 application, or BC857BW,135 equivalent, this device is selected for space-constrained designs requiring verified PNP gain consistency, low saturation voltage (VCE(sat) ≤ −250 mV at IC = −100 mA), and thermal reliability on FR4 PCBs with standard SMT reflow profiles.
Technical Context
The BC857BW,135 operates as a discrete PNP BJT with fixed emitter-base-collector terminal polarity and no integrated biasing or protection circuitry. Its hFE range (220–475) is specified under tightly controlled conditions (VCE = −5 V, IC = −2 mA), ensuring predictable small-signal amplification and switch turn-on behavior across temperature (−55 °C to 150 °C).
It exhibits VCE(sat) ≤ −250 mV at IC = −100 mA / IB = −5 mA and VBE(sat) ≤ −850 mV under the same drive, enabling efficient low-power switching in battery-operated logic interfaces and level-shifting stages where base drive current is limited.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −45 V - Maximum allowable collector-emitter voltage with base open; defines safe operating range in common-emitter switching applications. |
| IC | −100 mA - Continuous DC collector current rating; sets upper limit for load-driving capability in linear or saturated operation. |
| hFE | 220–475 - DC current gain at VCE = −5 V, IC = −2 mA; determines required base drive for target collector current in amplifier or switch design. |
| VCE(sat) | ≤ −250 mV - Collector-emitter saturation voltage at IC = −100 mA, IB = −5 mA; directly impacts power loss and voltage headroom in ON-state switching. |
| Ptot | 200 mW - Total power dissipation at Tamb ≤ 25 °C on standard FR4 PCB; constrains thermal design margin in enclosed or high-density layouts. |
| Rth(j-a) | 625 K/W - Junction-to-ambient thermal resistance in free air; used to calculate junction temperature rise under given power dissipation. |
Pinout & Package
SOT323 (SC-70) plastic surface-mounted package: 1.35 mm × 1.15 mm footprint, 0.4 mm nominal thickness, 3-terminal leadless construction optimized for high-density automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base (B) | Control terminal; forward-biased with negative voltage relative to emitter to enable conduction; requires current-limited drive per hFE and IC targets. |
| 2 | Emitter (E) | Current source terminal in PNP configuration; connected to higher potential rail (e.g., VCC) in common-emitter switches; defines reference for base and collector voltages. |
| 3 | Collector (C) | Current sink terminal; delivers load current to lower-potential node (e.g., GND or signal return); voltage swing limited by VCEO and VCBO ratings. |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SMT package | SOT323 footprint (1.35 × 1.15 mm) enables placement in <1.5 mm pitch layouts without solder bridging or tombstoning risk. |
| Controlled hFE binning | 220–475 range ensures consistent base drive requirements across production lots, reducing calibration overhead in production test. |
| Low VCE(sat) | ≤ −250 mV at full rated current minimizes conduction loss in battery-powered load switches and IO interface translators. |
| Thermal robustness | 150 °C max junction temperature and 625 K/W Rth(j-a) support reliable operation in sealed enclosures up to 70 °C ambient. |
Applications
| LED Driver Circuit | Microcontroller GPIO Expander |
|---|---|
Use Scenario: Driving 20 mA indicator LEDs from 3.3 V microcontroller outputs with inverted logic control. IC Role / Device Role / Timing Role: PNP switch sinking LED current from VCC to ground when base is pulled low; provides level inversion and current gain. Use Value: VCE(sat) ≤ −250 mV ensures >3.05 V forward voltage remains across LED at full brightness, maintaining luminance consistency. |
Use Scenario: Extending digital output capability of resource-constrained MCUs by adding active-low buffered outputs. IC Role / Device Role / Timing Role: Discrete PNP buffer stage translating MCU GPIO high/low states into complementary high-side switched outputs. Use Value: hFE ≥ 220 allows 50 µA base drive to reliably switch 10 mA loads, reducing MCU pin loading and preserving timing margins. |
| Signal Level Shifter | Low-Power Sensor Interface |
Use Scenario: Converting 1.8 V logic signals to 5 V domain in mixed-voltage sensor subsystems. IC Role / Device Role / Timing Role: PNP-based translator using emitter-follower or common-emitter topology to shift voltage thresholds while preserving edge integrity. Use Value: −45 V VCEO and −5 V VEBO ensure immunity to transient overshoot during hot-plug events in modular sensor nodes. |
Use Scenario: Enabling wake-up detection in always-on environmental sensors by amplifying weak analog signals before ADC sampling. IC Role / Device Role / Timing Role: Small-signal PNP amplifier configured in common-emitter mode to provide 20–30 dB voltage gain at sub-100 µA quiescent current. Use Value: fT ≥ 100 MHz supports stable gain up to 10 MHz, accommodating fast transient response in motion or acoustic sensing. |
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 but in SOT23 package (larger footprint, higher Rth(j-a) = 450 K/W). | Less suitable for ultra-dense PCBs; better thermal performance in high-reliability industrial modules. | Select when board layout permits larger pad spacing and thermal management prioritizes long-term stability over miniaturization. |
| MMBT3906LT1G | Higher VCEO (−40 V vs −45 V), wider hFE range (100–300), and slightly higher VCE(sat) (≤ −400 mV @ IC = −100 mA). | Marginally less efficient in low-voltage battery systems; broader gain distribution increases calibration effort. | Choose only if existing BOM uses ON Semiconductor's platform or qualification requires dual-sourcing from non-Nexperia vendors. |
Compared with BC857BW,135, the BC857B,115 trades package size for improved thermal derating, while MMBT3906LT1G offers cross-platform compatibility at the cost of tighter VCE(sat) control and narrower gain consistency-critical for precision analog front-ends.
Availability
BC857BW,135 is available at Aetrix Electronics and suitable for LED driver circuits, microcontroller GPIO expansion, signal level shifting, and low-power sensor interfaces requiring stable component supply across production volumes from prototype to mass manufacturing.
Supply support for BC857BW,135 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 essential efficiency technologies, delivering high-performance, reliable discrete and logic devices for automotive, industrial, and consumer markets.
The BC857BW,135 belongs to Nexperia's BC856W/BC857W/BC858W family of general-purpose PNP transistors, engineered for cost-sensitive, space-constrained applications demanding repeatable gain, low saturation voltage, and robust SMT manufacturability.
FAQ
What is the maximum operating temperature for BC857BW,135?
The BC857BW,135 has a maximum junction temperature (Tj) of 150 °C and a storage temperature range of −65 °C to +150 °C. Its thermal resistance Rth(j-a) is 625 K/W on standard FR4 PCB, so ambient temperature must be limited to ≤70 °C at full 100 mA load to maintain safe junction operation.
Does BC857BW,135 support pulsed operation beyond its DC ratings?
Yes-peak collector current (ICM) is rated at −200 mA for short pulses (tp ≤ 300 µs, duty cycle ≤ 2 %). This enables brief surge handling in LED strobing or sensor excitation circuits, provided average power remains within the 200 mW Ptot limit.
How does the BC857BW,135 marking code '3H%' correspond to the part number?
The top-side marking '3H%' identifies the BC857W series ('3H' = BC857W family), with '%' representing a site-specific manufacturing code. The 'BW' suffix in BC857BW,135 denotes the hFE bin (220–475), distinct from 'AW' (125–250) and 'CW' (420–800) variants-all sharing identical package and voltage/current ratings.
Can BC857BW,135 replace BC857B in existing SOT23 designs?
No-BC857BW,135 uses SOT323 (SC-70), which is physically smaller than SOT23. Pad layout, stencil aperture, and reflow profile must be revised. Electrical behavior is similar, but mechanical incompatibility prevents drop-in replacement without PCB redesign and validation.
BC857BW,135 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- 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:
- 600mV @ 5mA, 100mA
- Current - Collector Cutoff (Max):
- 15nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 220 @ 2mA, 5V
- Power - Max:
- 200 mW
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
BC857BW,135 FAQ
1.How can I place an order for BC857BW,135 through Aetrix?
Please submit a Request for Quotation (RFQ) for BC857BW,135 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 BC857BW,135 reliable?
The price and inventory of BC857BW,135 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC857BW,135 is usually 5 days.
3.What payment methods are accepted for BC857BW,135?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC857BW,135 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC857BW,135?
BC857BW,135 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC857BW,135 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 BC857BW,135?
For technical support, including BC857BW,135 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC857BW,135 requirements.
6.How does Aetrix verify that BC857BW,135 is sourced from the original manufacturer or authorized distributors?
All BC857BW,135 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 BC857BW,135 meets industry standards.
7.What is the process for return or replacement of BC857BW,135?
All BC857BW,135 units undergo pre-shipment inspection (PSI). If there is an issue with BC857BW,135, 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 BC857BW,135 part is unused and in its original packaging.
Return procedure for BC857BW,135:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC857BW,135 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…
