SM91502AL BMS Transformer 4300 VDC Hi-Pot AEC-Q200 Compliant
Bourns SM91502AL Isolation Transformer Module Overview
The Bourns SM91502AL is a single-channel Battery Management System (BMS) isolation transformer module featuring an integrated common mode choke for superior noise suppression. Specifically engineered for the high-safety requirements of Electric Vehicles (EV) and Energy Storage Systems (ESS), the SM91502AL supports serial daisy chain/isoSPI™ communication. With a 1000 VDC working voltage and AEC-Q200 compliance, it ensures robust signal integrity and galvanic isolation in the most demanding environments.
Product Highlights:
The SM91502AL stands out as a practical choice for BMS communication isolation because it combines electrical performance with production-ready reliability. Its specifications make it suitable for systems requiring dependable signal coupling and strong isolation characteristics.
- One channel with choke
- Supports serial daisy chain / IsoSPI
- Holds reference designs with Analog Devices LTC6804-1 / LTC6811
- Supports MC33771 / MC33772 reference designs
- Operating temperature: -40 °C to +125 °C
- Working voltage: 1000 VDC
- Hi-Pot: 4300 VDC
- AEC-Q200 compliant
- RoHS compliant
- Moisture Sensitivity Level: 1
Electrical Specifications of SM91502AL BMS Transformer
| Parameter | Specification |
|---|---|
| Open Circuit Inductance (OCL) | 150 µH min. / 450 µH max. |
| Test Condition for OCL | 100 kHz, 0.1 V, -40 °C to +125 °C |
| Leakage Inductance | 0.5 µH max. |
| Leakage Inductance Test Condition | 100 kHz, 0.1 V |
| DCR - Transformer Side | 0.45 Ω max. |
| DCR - CM Choke Side | 0.85 Ω max. |
| Turns Ratio | 1:1 ±2% |
| Insertion Loss | -0.25 dB max. @ 4 MHz |
| Return Loss (Z out = 100 ohms) | -22 dB min. @ 4 MHz |
| Common Mode Rejection Ratio | -35 dB min. @ 1–100 MHz |
| Common Mode Rejection Ratio | -28 dB min. @ 100–200 MHz |
| Hi-Pot (1 mA, 60 sec.) | 4300 VDC |
| Working Voltage | 1000 VDC |
SM91502AL Datasheet
1. SM91502AL BMS Transformer Datasheet - Electrical Schematic
2. SM91502AL BMS Transformer Datasheet - Recommended PCB Layout
3. SM91502AL BMS Transformer Datasheet - Dimensions
Mechanical and Environmental Specifications
| Parameter | Specification |
|---|---|
| Functional Insulation | Yes |
| Operating Temperature Range | -40 °C to +125 °C |
| Storage Temperature Range | -25 °C to +85 °C |
| Moisture Sensitivity Level | 1 |
| ESD Classification (HBM) | N/A |
| Packaging | Tape & Reel |
| Reel Quantity | 800 pcs. / 13-inch reel |
| Termination | Cu/Ni/Sn |
| Compliance | RoHS compliant |
Typical Applications
The SM91502AL BMS Transformer is well suited for designs that require isolation and stable communication inside battery monitoring networks. Common applications include:
- Battery management systems
- EV battery packs
- Energy storage systems
- High-voltage battery monitoring
- IsoSPI communication networks
- Isolated daisy-chain communication circuits
- Automotive and industrial control electronics
FAQ About SM91502AL BMS Transformer
In a Battery Management System, signal integrity and safety are non-negotiable. The SM91502AL stands out by offering functional insulation and a wide operating temperature range (-40 °C to +125 °C), making it suitable for under-the-hood automotive environments. Its low leakage inductance (0.5 µH max) ensures high-speed data accuracy, while the high CMRR protects your system from common-mode noise generated by high-power inverters.
1. What is the SM91502AL used for?
The SM91502AL is a BMS transformer used in battery management system communication and isolation circuits, especially in IsoSPI and serial daisy chain designs.
2. Is the SM91502AL suitable for automotive applications?
Yes. The SM91502AL is AEC-Q200 compliant, making it suitable for automotive-grade applications.
3. What is the working voltage of the SM91502AL?
The working voltage is 1000 VDC.
4. What is the hi-pot rating of the SM91502AL?
The hi-pot rating is 4300 VDC for 60 seconds at 1 mA.
5. Which reference designs is the SM91502AL compatible with?
It supports reference designs with Analog Devices LTC6804-1 / LTC6811 and MC33771 / MC33772.
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