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Nexperia USA Inc. BCM857BS/ZLF
- Part No.:
- BCM857BS/ZLF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Bipolar Transistor Arrays
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
BCM857BS/ZLF.pdf
- Description:
- TRANS 2NPN 45V 0.1A 6TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,454
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Product details
Overview
BCM857BS from Nexperia is a PNP/PNP matched double transistor in SOT363-3 (SC-88) 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 high-accuracy current mirroring and differential amplification in automotive sensor signal conditioning.
For engineers reviewing the BCM857BS datasheet, BCM857BS pinout, BCM857BS application, or BCM857BS equivalent, this device is selected for its AEC-Q101 qualification, dual-transistor matching performance, thermal resistance of 416 K/W (per device), and compatibility with reflow/wave soldering footprints defined for TSSOP6.
Technical Context
The BCM857BS integrates two fully isolated PNP transistors on a single die within a 6-pin TSSOP package, supporting matched operation without cross-coupling. Its design enables simultaneous biasing of both transistors under identical thermal and electrical conditions, critical for minimizing offset in current mirrors and differential pairs.
It operates with VCEO = −45 V, VEBO = −5 V, and junction temperature up to 150 °C, meeting automotive-grade reliability requirements. Matching specifications are guaranteed at Tamb = 25 °C with VCE = −5 V and IC = −2 mA - not extrapolated or simulated.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −45 V - maximum safe collector-emitter voltage with open base; defines headroom for high-side current mirror operation |
| IC (max) | −100 mA - continuous collector current per transistor; supports medium-current analog stages |
| hFE (typ) | 290 - DC current gain at −5 V VCE and −2 mA IC; ensures stable biasing in low-power differential amplifiers |
| hFE1/hFE2 | 0.9–1 - ratio of smaller/larger hFE values; guarantees ≤10% gain mismatch between transistors |
| VBE1−VBE2 | ≤2 mV - absolute difference in base-emitter voltage at −5 V VCE and −2 mA IC; minimizes input offset in matched-pair circuits |
| Ptot (device) | 300 mW - total power dissipation at Tamb ≤ 25 °C on FR4 PCB; sets thermal derating boundary for dual-transistor operation |
| fT (typ) | 175 MHz - transition frequency at −5 V VCE and −10 mA IC; supports audio and low-MHz signal processing bandwidths |
Pinout & Package
SOT363-3 (TSSOP6) plastic surface-mounted package: 2.2 mm × 1.35 mm footprint, 0.65 mm pitch, 0.95 mm max height, optimized for automated assembly and thermal performance on FR4 PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | E1 | Emitter of Transistor 1 - connects to current sink node in current mirror or differential pair emitter degeneration |
| 2 | B1 | Base of Transistor 1 - controls conduction of TR1; referenced to matched B2 for symmetry |
| 3 | C2 | Collector of Transistor 2 - output node for TR2 in mirrored current path or differential output stage |
| 4 | E2 | Emitter of Transistor 2 - tied to E1 in current mirror configuration; establishes common-mode reference |
| 5 | B2 | Base of Transistor 2 - biased identically to B1 to enforce matching; enables differential input drive |
| 6 | C1 | Collector of Transistor 1 - primary output node for TR1; used as reference leg in current mirror topology |
Key Features
| Feature | Design Value |
|---|---|
| Current gain matching | hFE1/hFE2 = 0.9–1 ensures ≤10% gain error between transistors, reducing current ratio drift in precision mirrors |
| Base-emitter voltage matching | VBE1−VBE2 ≤ 2 mV at −2 mA IC enables sub-millivolt input offset in differential amplifiers |
| AEC-Q101 qualification | Qualified for automotive applications including engine control modules and ADAS sensor interfaces |
| Thermal resistance (j-a) | 416 K/W per device on FR4 PCB allows stable operation up to 150 °C junction temperature |
Applications
| Current Mirror | Differential Amplifier |
|---|---|
Use Scenario: Precision current replication in sensor front-end biasing circuits where input current must be mirrored with minimal error across temperature. IC Role / Device Role / Timing Role: Dual PNP transistors operate in active region with matched hFE and VBE to enforce IOUT ≈ IIN. Use Value: ≤2 mV VBE mismatch and 0.9–1 hFE ratio limit current error to <1.5% over −40 °C to +125 °C. |
Use Scenario: Input stage of automotive cabin temperature controller amplifier, rejecting common-mode noise from shared supply rails. IC Role / Device Role / Timing Role: Matched PNP pair forms emitter-coupled differential pair with shared emitter resistor. Use Value: Tight VBE matching reduces input offset voltage to <1 mV, improving ADC resolution in 12-bit systems. |
| Automotive Sensor Interface | High-Voltage Analog Front-End |
Use Scenario: Signal conditioning for exhaust gas oxygen (EGO) sensors requiring stable bias current under wide ambient temperature swings. IC Role / Device Role / Timing Role: BCM857BS provides matched current sources for reference and sensing legs in bridge-based sensor excitation. Use Value: AEC-Q101 qualification and −45 V VCEO support operation in 24 V commercial vehicle systems with load dump transients. |
Use Scenario: High-side current sense amplifier input stage in industrial power supplies operating up to 40 V rail. IC Role / Device Role / Timing Role: PNP pair configured as cascoded current mirror to extend output voltage swing and improve PSRR. Use Value: −45 V VCEO and −50 V VCBO allow safe operation with 40 V supply plus 5 V transient margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar matched PNP transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BC857BDW | Same SOT363-3 package but hFE1/hFE2 = 0.85–1 and VBE1−VBE2 ≤ 3 mV; lower matching tolerance | Acceptable for non-automotive consumer-grade current mirrors where <2% error is acceptable | Select when cost sensitivity outweighs need for AEC-Q101 or tighter matching |
| MBT3906DW1T1G | SO-8 package, −40 V VCEO, hFE1/hFE2 = 0.8–1, no AEC-Q101 qualification; larger footprint and lower thermal efficiency | Suitable for prototyping on through-hole or SO-8 boards but not for space-constrained automotive modules | Choose only if legacy board layout requires SO-8 or if AEC-Q101 is not required |
Compared with BC857BDW and MBT3906DW1T1G, the BCM857BS offers superior matching (≤2 mV VBE, 0.9–1 hFE), AEC-Q101 compliance, and optimized thermal resistance (416 K/W), making it the only option qualified for production automotive signal conditioning where offset stability and reliability are mandatory.
Availability
BCM857BS is available at Aetrix Electronics and suitable for automotive sensor interfaces, precision current mirrors, differential amplifiers, and high-voltage analog front-ends requiring stable component supply across extended temperature ranges and long product 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 AEC-Q101-qualified matched transistor family, engineered specifically for precision analog functions in automotive and industrial signal chains where parameter matching and thermal stability are critical.
FAQ
Is BCM857BS pin-compatible with BC857BS?
No - BC857BS is a single PNP transistor in SOT23 package, while BCM857BS is a dual matched PNP in SOT363-3 with six pins and different pinout (E1-B1-C2-E2-B2-C1). They share no pin mapping or functional equivalence.
What is the maximum allowable power dissipation at 85 °C ambient?
At Tamb = 85 °C, the device's total power dissipation must be derated from 300 mW using Rth(j-a) = 416 K/W: Pmax = (150 °C − 85 °C) / 416 K/W = 156 mW. This ensures junction temperature remains ≤150 °C.
Does BCM857BS support wave soldering?
Yes - Nexperia provides dedicated wave soldering footprint (Fig. 15) with 5.3 mm × 2.45 mm pad layout and preferred transport direction. Peak temperature must not exceed 260 °C for ≤5 seconds per IPC-J-STD-020.
Can BCM857BS be used in NPN-based current mirrors?
No - BCM857BS contains only PNP transistors and cannot replace NPN pairs. For NPN matched mirrors, consider alternatives like BCM847BS. Using PNP devices in NPN topologies would require circuit redesign and violates polarity constraints.
BCM857BS/ZLF 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/ZLF FAQ
1.How can I place an order for BCM857BS/ZLF through Aetrix?
Please submit a Request for Quotation (RFQ) for BCM857BS/ZLF 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/ZLF reliable?
The price and inventory of BCM857BS/ZLF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCM857BS/ZLF is usually 5 days.
3.What payment methods are accepted for BCM857BS/ZLF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCM857BS/ZLF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BCM857BS/ZLF?
BCM857BS/ZLF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BCM857BS/ZLF 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/ZLF?
For technical support, including BCM857BS/ZLF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCM857BS/ZLF requirements.
6.How does Aetrix verify that BCM857BS/ZLF is sourced from the original manufacturer or authorized distributors?
All BCM857BS/ZLF 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/ZLF meets industry standards.
7.What is the process for return or replacement of BCM857BS/ZLF?
All BCM857BS/ZLF units undergo pre-shipment inspection (PSI). If there is an issue with BCM857BS/ZLF, 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/ZLF part is unused and in its original packaging.
Return procedure for BCM857BS/ZLF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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