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Nexperia USA Inc. BCM857BS-QX
- Part No.:
- BCM857BS-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Bipolar Transistor Arrays
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
BCM857BS-QX.pdf
- Description:
- TRANS 2PNP 45V 100MA 6-TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:6,857
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Product details
Overview
BCM857BS-QX from Nexperia is a PNP/PNP matched double transistor in SOT363-3 (TSSOP6) package, designed for precision analog functions requiring tight current gain (hFE1/hFE2 = 0.9–1) and base-emitter voltage matching (≤2 mV) at −5 V VCE and −2 mA IC. It delivers −45 V VCEO, −100 mA IC per transistor, and 200–450 hFE, enabling stable current mirroring and differential amplification in automotive-grade circuits.
For engineers reviewing the BCM857BS-QX datasheet, BCM857BS-QX pinout, BCM857BS-QX application, or BCM857BS-QX equivalent, this AEC-Q101-qualified matched pair supports high-accuracy biasing, temperature-stable gain tracking, and space-constrained dual-transistor layout in safety-critical analog signal paths.
Technical Context
This device integrates two fully isolated PNP transistors on a single die with matched electrical characteristics-ensuring identical hFE and VBE across both units under identical bias conditions. Its internal isolation prevents crosstalk, while thermal coupling maintains tracking over temperature (−65 °C to +150 °C).
The matched pair operates with VCE = −5 V, IC = −2 mA as reference condition for matching specs; VBE decreases by ~2 mV/K and VBEsat drops ~1.7 mV/K with rising temperature-enabling predictable drift compensation in mirror and amplifier topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −45 V: Maximum safe collector-emitter voltage per transistor with open base-defines headroom in high-side current mirror or active load applications. |
| IC | −100 mA: Continuous collector current per transistor-supports medium-power biasing and small-signal switching up to 100 mA DC. |
| hFE | 200–450 at VCE = −5 V, IC = −2 mA: High and tightly distributed DC current gain-enables precise gain-setting and low-error current replication. |
| hFE1/hFE2 | 0.9–1: Ratio of smaller/larger hFE values-guarantees ≤10% gain mismatch between transistors, critical for balanced differential pairs. |
| VBE1−VBE2 | ≤2 mV at VCE = −5 V, IC = −2 mA: Max base-emitter voltage difference-ensures sub-millivolt offset in current mirrors and emitter-coupled logic. |
| Ptot (device) | 300 mW at Tamb ≤ 25 °C on FR4 PCB: Total power dissipation limit for the dual-transistor unit-dictates thermal derating in compact layouts. |
Pinout & Package
Package: SOT363-3 (TSSOP6), 1.3 mm × 2.2 mm × 0.95 mm, 6-pin surface-mount plastic package with exposed pad not present; rated for −65 °C to +150 °C ambient and junction operation.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | E1 | Emitter of Transistor 1-connects to low-side reference node in current mirror or tail current source in differential pair. |
| 2 | B1 | Base of Transistor 1-controls conduction of TR1; tied to TR2 collector in standard current mirror configuration. |
| 3 | C2 | Collector of Transistor 2-output node in current mirror; provides mirrored current to load or next stage. |
| 4 | E2 | Emitter of Transistor 2-common emitter connection shared with E1 in differential amplifier topology. |
| 5 | B2 | Base of Transistor 2-input node for second leg of differential pair or feedback path in active load configuration. |
| 6 | C1 | Collector of Transistor 1-reference input node in current mirror; sets reference current via external resistor or bias network. |
Key Features
| Feature | Design Value |
|---|---|
| Current gain matching | hFE1/hFE2 ratio 0.9–1 ensures ≤10% gain error between transistors-reducing common-mode error in precision analog blocks. |
| Base-emitter voltage matching | VBE1−VBE2 ≤2 mV enables <100 µA output current error in 1 mA mirror-critical for sensor front-end bias stability. |
| AEC-Q101 qualification | Qualified for automotive applications including engine control, ADAS sensors, and body electronics-validates reliability under thermal cycling, humidity, and vibration stress. |
| Thermal coupling | Monolithic integration ensures matched thermal coefficients-maintains VBE and hFE tracking across −55 °C to +125 °C operating range. |
Applications
| Current Mirror | Differential Amplifier |
|---|---|
|
Use Scenario: Precision current replication in sensor bias networks and DAC output stages. IC Role / Device Role / Timing Role: Dual-transistor active current source/sink providing matched reference and output legs. Use Value: ≤2 mV VBE mismatch ensures <0.2% current error at 1 mA-enabling 12-bit+ linearity in analog signal chains. |
Use Scenario: Input stage of automotive-grade operational amplifiers and instrumentation amplifiers. IC Role / Device Role / Timing Role: Matched PNP pair forming emitter-coupled differential pair with common emitter tail. Use Value: 0.9–1 hFE matching reduces input offset drift by >50% versus discrete transistors-improving DC accuracy over temperature. |
| Active Load | Temperature-Stable Bias Generator |
|
Use Scenario: High-impedance active load in rail-to-rail op-amp output stages. IC Role / Device Role / Timing Role: TR1 acts as current source load for TR2-based gain stage; configured as cascode or diode-connected. Use Value: Monolithic matching ensures identical thermal drift-maintaining constant small-signal resistance (ro) across temperature. |
Use Scenario: Reference current generator for bandgap circuits and voltage regulators in infotainment ECUs. IC Role / Device Role / Timing Role: Paired transistors biased in Wilson or Widlar configurations to produce PTAT/CTAT currents. Use Value: ≤2 mV VBE mismatch minimizes curvature error in PTAT current-achieving <50 ppm/°C reference stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar matched PNP transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BC847BS | PNP/NPN complementary pair-not matched; hFE min 110, no VBE matching spec. | Suitable for general-purpose switching, not precision analog matching. | Select only when matched performance is unnecessary and complementary topology is required. |
| MBT3906DW1T1G | PNP/PNP pair in SOT-363 but no published hFE/VBE matching data; AEC-Q101 qualified. | Lacks guaranteed matching specs-requires board-level trimming for analog use. | Use only in non-critical biasing where post-calibration is acceptable. |
Compared with BC847BS and MBT3906DW1T1G, BCM857BS-QX uniquely guarantees ≤2 mV VBE and 0.9–1 hFE matching-making it the only drop-in solution for production automotive current mirrors without calibration.
Availability
BCM857BS-QX is available at Aetrix Electronics and suitable for automotive sensor interfaces, precision current sources, and differential amplifier front-ends requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for BCM857BS-QX 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 essential semiconductors-including discretes, logic, and MOSFETs-with manufacturing rooted in process excellence and automotive qualification leadership.
BCM857BS-QX belongs to Nexperia's AEC-Q101-qualified matched transistor family, engineered specifically for zero-drift analog functions in automotive powertrain, chassis, and ADAS systems where parametric consistency is non-negotiable.
FAQ
Is BCM857BS-QX pin-compatible with standard SOT363 dual transistors?
Yes-BCM857BS-QX uses the industry-standard TSSOP6 (SOT363-3) footprint with 0.65 mm pitch and identical pin 1 indexing. Its pinout (E1-B1-C2-E2-B2-C1) matches JEDEC MO-178AC and is mechanically compatible with automated placement and reflow soldering per IPC-7351B.
What is the maximum continuous power dissipation for BCM857BS-QX at 85 °C ambient?
At Tamb = 85 °C, the device's total power dissipation must be derated from 300 mW (at 25 °C) using Rth(j-a) = 416 K/W. This yields Ptot(max) ≈ 175 mW-calculated as (150 °C − 85 °C) / 416 K/W. Exceeding this risks junction temperature exceeding 150 °C.
Does BCM857BS-QX support operation in the linear (active) region for analog amplification?
Yes-its specified hFE (200–450), VCEsat (−200 to −400 mV), and noise figure (3.1 dB at 1 kHz) confirm suitability for linear-region operation. The matched characteristics ensure predictable gm and ro behavior in Class-A amplifier stages and active loads.
How does the AEC-Q101 qualification impact BCM857BS-QX's use in non-automotive applications?
AEC-Q101 qualification certifies robustness against thermal cycling, mechanical shock, and humidity-making BCM857BS-QX highly reliable in industrial, medical, and aerospace applications where long-term parametric stability and field failure avoidance are critical, even outside automotive environments.
BCM857BS-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- 6-TSSOP, SC-88, SOT-363
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Transistor Type:
- 2 PNP (Matched Pair)
- Current - Collector (Ic) (Max):
- 100mA
- Voltage - Collector Emitter Breakdown (Max):
- 45V
- Vce Saturation (Max) @ Ib, Ic:
- 400mV @ 5mA, 100mA
- Current - Collector Cutoff (Max):
- 15nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 200 @ 2mA, 5V
- Power - Max:
- 200mW
- Frequency - Transition:
- 175MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-TSSOP
BCM857BS-QX FAQ
1.How can I place an order for BCM857BS-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BCM857BS-QX 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 BCM857BS-QX reliable?
The price and inventory of BCM857BS-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCM857BS-QX is usually 5 days.
3.What payment methods are accepted for BCM857BS-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCM857BS-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BCM857BS-QX?
BCM857BS-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BCM857BS-QX 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 BCM857BS-QX?
For technical support, including BCM857BS-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCM857BS-QX requirements.
6.How does Aetrix verify that BCM857BS-QX is sourced from the original manufacturer or authorized distributors?
All BCM857BS-QX 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 BCM857BS-QX meets industry standards.
7.What is the process for return or replacement of BCM857BS-QX?
All BCM857BS-QX units undergo pre-shipment inspection (PSI). If there is an issue with BCM857BS-QX, 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 BCM857BS-QX part is unused and in its original packaging.
Return procedure for BCM857BS-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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