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NXP Semiconductors MC33771BSA2AE
- Part No.:
- MC33771BSA2AE
- Manufacturer:
- NXP Semiconductors
- Category:
- Battery Management
- Package:
- 64-LQFP Exposed Pad
- Datasheet:
-
MC33771BSA2AE.pdf
- Description:
- IC BAT CNTRL LI-ION 7-14C 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,970
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Product details
Overview
MC33771BSA2AE from NXP Semiconductors is a battery cell controller IC for automotive and industrial battery management systems, supporting 7–8 series lithium-ion cells, performing differential cell voltage measurement (±0.7 mV error), coulomb counting, and temperature monitoring via seven GPIO/temperature inputs, with isolated TPL communication at 2.0 Mbps for high-noise EV/ESS environments.
For engineers reviewing the MC33771BSA2AE datasheet, MC33771BSA2AE pinout, MC33771BSA2AE application, or MC33771BSA2AE equivalent, this device delivers ASIL D–compliant cell supervision, passive balancing up to 300 mA per channel, and integrated fault detection for overvoltage, undervoltage, and thermal events in high-voltage battery stacks.
Technical Context
The MC33771BSA2AE implements synchronized 15-bit ADC conversion across all monitored cells and current sense channels, with automatic PGA gain switching (4× to 256×) for precision shunt-based current measurement up to ±150 mV differential input. Its dual-domain architecture separates analog sensing (CT/ISENSE/GPIO) from digital control (TPL/SPI/FAULT), enabling robust operation under transient VPWR conditions from 9.6 V to 63 V.
It supports daisy-chained TPL communication using transformer-coupled differential signaling (RDTX_OUT±/SI/RDTX_IN±), eliminating ground loop issues in multi-module battery packs. The device integrates dedicated hardware comparators for real-time OV/UV/OT/UT detection routed to the FAULT pin, with configurable thresholds and hysteresis, plus sleep-mode monitoring independent of host MCU activity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Cell count support | 7–8 series Li-ion cells - enables compact BMS designs for 48 V mild-hybrid or e-scooter battery packs. |
| Cell voltage accuracy | ±0.7 mV (0.1–4.8 V, −40 °C to +105 °C) - ensures reliable SOC estimation and cell balancing decisions across full operating range. |
| Communication interface | Isolated 2.0 Mbps TPL (Transformer Isolation Protocol) - provides noise-immune, ground-isolated daisy-chain connectivity for multi-tier battery modules. |
| Passive balancing | Onboard 300 mA per channel with diagnostics - eliminates external FETs and current-sense resistors for cost-optimized cell equalization. |
| Supply voltage range | 9.6 V to 63 V VPWR with 75 V transient tolerance - supports direct connection to high-voltage battery stacks without external regulators. |
| Safety certification | Designed to ISO 26262 up to ASIL D - meets functional safety requirements for automotive traction battery control without additional decomposition. |
| Operating temperature | −40 °C to +105 °C ambient - qualified per AEC-Q100 Grade 1 for under-hood and energy storage system deployment. |
Pinout & Package
MC33771BSA2AE uses a 64-pin LQFP-EP package with exposed thermal pad, optimized for thermal dissipation in high-power BMS applications. Pin layout supports daisy-chain TPL interconnect, cell voltage sensing, passive balancing, and multi-channel temperature monitoring.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VPWR1 / VPWR2 | Primary power inputs | Accept 9.6–63 V stack voltage; dual inputs improve current sharing and reduce trace inductance in high-current PCB layouts. |
| CT_1 to CT_8, CT_REF | Differential cell voltage inputs | Measure voltage across up to 8 cells with 15-bit resolution; CT_REF sets reference for bottom cell; all inputs include LPF termination support. |
| CB_1 to CB_8, CB_x:x-1_C | Passive cell balance drivers | Drive external balancing resistors; CB_x:x-1_C pins enable shared resistor configurations between adjacent cells to reduce component count. |
| RDTX_OUT± / SI/RDTX_IN± | Transformer-coupled TPL I/O | Enable galvanically isolated, noise-immune daisy-chain communication between multiple MC33771 devices without optocouplers or isolators. |
| GPIO0–GPIO6 | Configurable analog/digital I/O | Support precision temperature sensing (ratiometric ANx mode), wake-up triggers, fault chaining, or general-purpose digital I/O with 3.3 V logic compatibility. |
| ISENSE+ / ISENSE− | Shunt-based current measurement inputs | Accept ±150 mV differential input; integrated PGA auto-scales gain for optimal dynamic range across charge/discharge currents. |
| FAULT | Open-drain fault output | Asserts low on internal/external faults (OV/UV/OT/UT/open line/short); supports wired-OR daisy-chain fault propagation across stacked devices. |
Key Features
| Feature | Design Value |
|---|---|
| ASIL D–ready safety architecture | Hardware redundancy, lockstep monitoring, and diagnostic coverage validated for ISO 26262 compliance - reduces BMS functional safety validation effort. |
| Synchronized multi-channel ADC | Simultaneous sampling of all 8 cell voltages and current with <25 µs net conversion time at 16-bit resolution - enables accurate state-of-charge and state-of-health calculation. |
| Integrated VCOM regulator | 5.0 V @ 5.0 mA output with UV/OV protection and 10 µs fault timer - powers external sensors or level shifters without external LDO. |
| Programmable fault routing | User-configurable mapping of OV/UV/OT/UT events to FAULT pin or internal registers - allows flexible fault response strategies per application requirement. |
| Hot-plug capable design | Operates during live insertion into powered battery stacks; no brown-out or latch-up risk during module replacement - improves serviceability in field-deployed ESS. |
Applications
| Automotive 48 V Mild-Hybrid Systems | E-Bikes and E-Scooters |
|---|---|
Use Scenario: Monitoring and balancing of 7–8 series Li-ion cells in 48 V starter-generator or P0/P1 hybrid architectures. IC Role / Device Role / Timing Role: Primary cell supervisor performing real-time voltage, current, and temperature acquisition with ASIL D–compliant fault reporting to vehicle MCU via TPL daisy chain. Use Value: Enables precise SOC estimation and cell-level balancing to extend battery life and ensure safe operation under regenerative braking and high-current load transients. |
Use Scenario: Compact BMS for lightweight two-wheeled EVs requiring high reliability in vibration-prone, thermally constrained enclosures. IC Role / Device Role / Timing Role: Standalone cell controller managing 8-cell pack with integrated balancing, temperature sensing, and fault signaling to vehicle controller over isolated TPL link. Use Value: Reduces bill-of-materials by integrating VCOM regulator, precision ADC, and balancing drivers - critical for cost-sensitive consumer mobility platforms. |
| Energy Storage Systems (ESS) | Uninterruptible Power Supply (UPS) |
Use Scenario: Supervision of modular 48 V battery racks in residential/commercial ESS where thermal management and long-term reliability are paramount. IC Role / Device Role / Timing Role: Distributed cell monitor in multi-tier rack architecture, communicating via transformer-isolated TPL to central BMS controller with minimal EMI coupling. Use Value: Supports >10-year field life with −40 °C to +105 °C operation, sleep-mode monitoring, and diagnostic logging - meeting UL 1973 and IEC 62619 requirements. |
Use Scenario: High-availability UPS systems requiring fail-safe battery health monitoring during grid outages and frequent charge/discharge cycles. IC Role / Device Role / Timing Role: Real-time coulomb counter and cell voltage supervisor with autonomous overvoltage/undervoltage shutdown - maintains backup readiness without host MCU intervention. Use Value: Guarantees uninterrupted runtime through precise end-of-discharge detection and balanced cell aging, minimizing unexpected downtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery cell controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC33771BSA1AE | Supports 7–14 cells; identical TPL interface, accuracy, and safety features - differs only in channel count and internal multiplexer configuration. | Used in higher-cell-count packs (e.g., 60–800 V EV traction batteries); requires different PCB layout for extended CT/CB routing. | Select when scaling from 8- to 14-cell stacks without changing firmware or safety architecture. |
| MC33772BTA2AE | 6-cell variant with SPI-only interface; lacks TPL, VCOM regulator, and GPIO temperature capability - lower integration and ASIL D coverage. | Targeted at cost-sensitive, low-channel-count applications (e.g., power tools) where isolation and extended temperature sensing are not required. | Choose only for non-automotive, non-ESS use cases where TPL isolation and ASIL D are unnecessary and BOM cost is primary driver. |
Compared with MC33771BSA1AE and MC33772BTA2AE, the MC33771BSA2AE uniquely balances 7–8 cells with TPL isolation and ASIL D compliance in a single 64-pin LQFP package - making it optimal for compact, safety-critical 48 V systems where channel count, noise immunity, and functional safety are jointly constrained.
Availability
MC33771BSA2AE is available at Aetrix Electronics and suitable for automotive 48 V mild-hybrid systems, e-bike battery management, and industrial energy storage systems requiring stable component supply, long lifecycle support, and AEC-Q100–qualified performance.
Supply support for MC33771BSA2AE 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
NXP Semiconductors is a global semiconductor leader specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in functional safety and battery management.
The MC33771BSA2AE belongs to NXP's SMARTMOS battery controller product line, engineered specifically for high-reliability, ASIL D–compliant monitoring of lithium-ion battery stacks in electric vehicles and stationary energy storage.
FAQ
What communication protocol does the MC33771BSA2AE support?
The MC33771BSA2AE supports Transformer Isolation Protocol (TPL) at 2.0 Mbps for daisy-chained, ground-isolated communication. It does not support SPI - the 'S' in the part number denotes SPI-capable variants, but the 'T' suffix in MC33771BTA2AE indicates TPL; however, per Table 2, MC33771BSA2AE is explicitly listed as TPL differential communication protocol. This confirms its exclusive TPL interface, optimized for noise immunity in high-voltage battery systems.
How many battery cells can the MC33771BSA2AE monitor and balance?
The MC33771BSA2AE monitors and balances 7 to 8 series-connected lithium-ion cells, as defined in the part number breakdown (z = 2) and confirmed in Table 2. Its pinout includes CT_1 through CT_8 and corresponding CB_1 through CB_8 terminals, with dedicated CT_REF and CB_x:x-1_C pins enabling precise differential measurement and shared-resistor balancing for this channel count.
Does the MC33771BSA2AE include integrated passive cell balancing?
Yes, the MC33771BSA2AE integrates onboard passive cell balancing drivers rated for 300 mA per channel, with built-in diagnostics for open-load and short-circuit detection. Each CB pin (CB_1 to CB_8) drives an external balancing resistor, and CB_x:x-1_C pins support common-node configurations to reduce component count in 7–8 cell stacks.
What is the operating temperature range and qualification status of the MC33771BSA2AE?
The MC33771BSA2AE operates from −40 °C to +105 °C ambient temperature and is qualified to AEC-Q100 Grade 1. It is designed to meet ISO 26262 up to ASIL D for functional safety, with hardware-level diagnostics, redundant monitoring paths, and fault-tolerant architecture validated for automotive traction battery applications.
Can the MC33771BSA2AE perform current measurement and coulomb counting?
Yes, the MC33771BSA2AE performs high-precision current measurement via dedicated ISENSE+ and ISENSE− inputs, supporting ±150 mV differential range with auto-ranging PGA (4× to 256× gain). It calculates coulomb count in hardware using synchronized ADC conversions, enabling accurate state-of-charge tracking without host MCU computational overhead.
MC33771BSA2AE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 64-LQFP Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Battery Cell Controller
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 7 ~ 14
- Fault Protection:
- Over/Under Voltage
- Interface:
- SPI
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-LQFP (10x10)
MC33771BSA2AE FAQ
1.How can I place an order for MC33771BSA2AE through Aetrix?
Please submit a Request for Quotation (RFQ) for MC33771BSA2AE 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 MC33771BSA2AE reliable?
The price and inventory of MC33771BSA2AE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC33771BSA2AE is usually 5 days.
3.What payment methods are accepted for MC33771BSA2AE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC33771BSA2AE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC33771BSA2AE?
MC33771BSA2AE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC33771BSA2AE 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 MC33771BSA2AE?
For technical support, including MC33771BSA2AE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC33771BSA2AE requirements.
6.How does Aetrix verify that MC33771BSA2AE is sourced from the original manufacturer or authorized distributors?
All MC33771BSA2AE 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 MC33771BSA2AE meets industry standards.
7.What is the process for return or replacement of MC33771BSA2AE?
All MC33771BSA2AE units undergo pre-shipment inspection (PSI). If there is an issue with MC33771BSA2AE, 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 MC33771BSA2AE part is unused and in its original packaging.
Return procedure for MC33771BSA2AE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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