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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Bipolar Transistor Arrays

Nexperia USA Inc. BCM857BS/ZLX

Name: BCM857BS/ZLX
Brand: Nexperia USA Inc.
SKU: BCM857BS/ZLX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BCM857BS/ZLX

Manufacturer:: Nexperia USA Inc.

Category:: Bipolar Transistor Arrays

Package:: 6-TSSOP, SC-88, SOT-363

Datasheet:: BCM857BS/ZLX.pdf

Description:: TRANS 2NPN 45V 0.1A 6TSSOP

Quantity:: RFQ Add To RFQ list

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Inventory:2,239

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Product details

Overview

BCM857BS from Nexperia is a PNP/PNP matched double transistor in SOT363-3 (SC-88) package, featuring fully isolated transistors with h_FE matching ratio ≥0.9 and V_BE mismatch ≤2 mV at −5 V V_CE, −2 mA I_C, 25 °C - optimized for precision current mirroring and differential amplification in automotive-grade analog circuits.

For engineers reviewing the BCM857BS datasheet, BCM857BS pinout, BCM857BS application, or BCM857BS equivalent, this device supports AEC-Q101-compliant designs requiring matched gain and voltage characteristics across temperature, with validated thermal resistance of 416 K/W (device-level) and total power dissipation up to 300 mW on FR4 PCB.

Technical Context

The BCM857BS integrates two electrically isolated PNP transistors on a single die within a TSSOP6 footprint, enabling precise analog signal conditioning without cross-coupling. Its matching specifications are measured under identical bias conditions (V_CE = −5 V, I_C = −2 mA, T_amb = 25 °C), with h_FE1/h_FE2 defined as the smaller-to-larger ratio and V_BE1−V_BE2 as absolute difference.

It operates across −65 °C to +150 °C ambient range, with junction temperature limited to 150 °C and absolute maximum ratings including −45 V V_CEO, −100 mA I_C, and −5 V V_EBO. Thermal performance is specified for standard FR4 PCB mounting with single-sided copper and tin plating.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−45 V - maximum safe collector-emitter voltage with base open; defines high-side switching headroom in PNP current mirror configurations
I_C	−100 mA - continuous collector current per transistor; supports rail-to-rail analog stage biasing up to 100 mA load
h_FE	200–450 (typ. 290) at −5 V V_CE, −2 mA I_C - ensures stable DC gain in feedback loops and active load applications
h_FE1/h_FE2	≥0.9 - quantifies current gain tracking between transistors; critical for <1% error in mirrored current sources
V_BE1−V_BE2	≤2 mV - base-emitter voltage mismatch directly impacts offset voltage in differential pairs and current mirrors
P_tot (device)	300 mW - total power dissipation limit for both transistors on FR4 PCB; enables compact layout without forced cooling
f_T	100–175 MHz - transition frequency at −5 V V_CE, −10 mA I_C; supports audio and low-MHz signal processing bandwidths

Pinout & Package

SOT363-3 (TSSOP6) plastic surface-mounted package with 0.65 mm lead pitch, 2.2 mm × 1.3 mm body size, and transparent top view marking. Pin 1 indexed by notch or dot; JEDEC-compliant footprint for reflow/wave soldering.

Pin/Terminal	Circuit Role	Design Meaning
1	E1	Emitter of Transistor 1 - connects to reference current path or common emitter node in differential pair
2	B1	Base of Transistor 1 - controls I_C1 in current mirror master or input side of differential amplifier
3	C2	Collector of Transistor 2 - output node for mirrored current or active load in differential stage
4	E2	Emitter of Transistor 2 - tied to same potential as E1 in current mirror; forms common emitter node
5	B2	Base of Transistor 2 - driven by same voltage as B1 in mirror, or biased independently in differential configuration
6	C1	Collector of Transistor 1 - input current source node in mirror; collector of first transistor in differential pair

Key Features

Feature	Design Value
Current gain matching	h_FE1/h_FE2 ≥ 0.9 - reduces gain error in dual-transistor feedback networks and improves CMRR in matched-pair amplifiers
Base-emitter voltage matching	V_BE1−V_BE2 ≤ 2 mV - minimizes input offset voltage in differential stages and current-source mismatch below 0.2%
AEC-Q101 qualification	Qualified for automotive applications - guarantees reliability under temperature cycling, humidity, and mechanical stress per AEC standard
Thermal resistance (device)	R_th(j-a) = 416 K/W - enables operation up to 150 °C junction temperature on standard FR4 PCB without heatsinking

Applications

Current Mirror

Differential Amplifier

Use Scenario: Precision current replication in sensor biasing, LED drivers, and analog front-end reference generation.

IC Role / Device Role / Timing Role: Dual PNP transistors operate as matched master/slave pair with shared emitter node and identical base drive.

Use Value: ≤2 mV V_BE mismatch ensures <0.2% current error over temperature, eliminating need for external trimming resistors.

Use Scenario: High-CMRR input stage in automotive battery monitors, motor control feedback, and industrial signal conditioning.

IC Role / Device Role / Timing Role: Two matched PNP transistors form emitter-coupled pair with common emitter resistor and independent base inputs.

Use Value: h_FE matching ≥0.9 and tight V_BE tracking improve differential gain stability and reduce input offset drift.

Active Load Circuit

Temperature-Stable Bias Generator

Use Scenario: Replacement for resistive loads in high-gain amplifier stages where dynamic impedance and thermal tracking matter.

IC Role / Device Role / Timing Role: One transistor acts as constant-current sink while the other provides matched thermal response as active load.

Use Value: Matched thermal coefficients and identical packaging ensure correlated drift, maintaining gain flatness across −40 °C to +125 °C.

Use Scenario: Generating stable reference currents in voltage regulators, bandgap circuits, and precision DAC output buffers.

IC Role / Device Role / Timing Role: Transistors configured in Wilson or Widlar topology using internal matching to cancel V_BE and β variations.

Use Value: Integrated matching eliminates inter-die variation, achieving <±1.5% current accuracy over full automotive temperature range.

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; no h_FE or V_BE matching specification	Not suitable for current mirror or differential pair requiring matching	Select only when complementary switching-not matched analog operation-is required
BCM847BS	Same SOT363-3 package but NPN/NPN matched pair; h_FE matching ≥0.9, V_BE mismatch ≤2 mV	Applicable in NPN-based current mirrors and differential amplifiers; incompatible with PNP-only topologies	Choose for NPN-biased systems; not drop-in compatible due to polarity reversal

Compared with BC847BS and BCM847BS, the BCM857BS uniquely delivers PNP/PNP matching essential for high-accuracy PNP-centric analog blocks-its V_BE and h_FE specs enable sub-0.2% current error where BC847BS lacks matching data and BCM847BS requires circuit redesign for polarity.

Availability

BCM857BS is available at Aetrix Electronics and suitable for automotive battery management, industrial sensor signal conditioning, and precision analog power supply design requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for BCM857BS 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-qualified components and advanced packaging.

The BCM857BS belongs to Nexperia's matched transistor product line, engineered specifically for analog signal integrity in safety-critical automotive and industrial systems where parametric consistency across devices is mandatory.

FAQ

What is the maximum junction temperature for BCM857BS?

The absolute maximum junction temperature is 150 °C, as defined in IEC 60134 limiting values. Operation above this threshold risks permanent degradation. Derating is required above 25 °C ambient, with R_th(j-a) = 416 K/W for the full device on standard FR4 PCB - meaning usable power drops linearly to zero at 150 °C junction.

Is BCM857BS pin-compatible with BC857BS?

No - BC857BS is a single PNP transistor in SOT23, while BCM857BS is a dual PNP in SOT363-3 with six pins and internal isolation. Pin count, footprint, and function differ fundamentally; no mechanical or electrical compatibility exists without PCB redesign.

Does BCM857BS require external biasing for current mirror operation?

Yes - it provides matched transistors but no integrated bias circuitry. External base resistors or voltage references are needed to set operating point. Typical use applies identical V_BE to both bases (e.g., diode-connected TR1 driving TR2 base) to exploit matching for low-error current replication.

How is h_FE1/h_FE2 matching verified in production?

Nexperia measures h_FE of both transistors under identical test conditions (V_CE = −5 V, I_C = −2 mA, T_amb = 25 °C) and calculates the ratio using the smaller value as numerator. This screening occurs at wafer and final test; AEC-Q101 qualification includes correlation testing across temperature and life testing to validate matching stability.

BCM857BS/ZLX Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: 6-TSSOP, SC-88, SOT-363

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: -

Current - Collector (Ic) (Max):: -

Voltage - Collector Emitter Breakdown (Max):: -

Vce Saturation (Max) @ Ib, Ic:: -

Current - Collector Cutoff (Max):: -

DC Current Gain (hFE) (Min) @ Ic, Vce:: -

Power - Max:: -

Frequency - Transition:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 6-TSSOP

BCM857BS/ZLX FAQ

1.How can I place an order for BCM857BS/ZLX through Aetrix?

Please submit a Request for Quotation (RFQ) for BCM857BS/ZLX 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/ZLX reliable?

The price and inventory of BCM857BS/ZLX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCM857BS/ZLX is usually 5 days.

3.What payment methods are accepted for BCM857BS/ZLX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCM857BS/ZLX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BCM857BS/ZLX?

BCM857BS/ZLX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BCM857BS/ZLX 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/ZLX?

For technical support, including BCM857BS/ZLX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCM857BS/ZLX requirements.

6.How does Aetrix verify that BCM857BS/ZLX is sourced from the original manufacturer or authorized distributors?

All BCM857BS/ZLX 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/ZLX meets industry standards.

7.What is the process for return or replacement of BCM857BS/ZLX?

All BCM857BS/ZLX units undergo pre-shipment inspection (PSI). If there is an issue with BCM857BS/ZLX, 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/ZLX part is unused and in its original packaging.

Return procedure for BCM857BS/ZLX:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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