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STMicroelectronics RBO40-40G-TR
- Part No.:
- RBO40-40G-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
RBO40-40G-TR.pdf
- Description:
- TVS DIODE 20VWM 40VC D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:7,538
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Product details
Overview
RBO40-40G-TR from STMicroelectronics is a monolithic automotive-grade discrete protection device integrating reversed-battery diode (D1), negative-surge Transil (T1), and load-dump Transil (T2) in a single D2PAK package. It delivers 40 A DC forward current, ±40 V max clamping voltage, and 80 V peak load dump voltage compliance with ISO/DTR 7637 Pulse 5, used for protecting motor control modules and ECUs against polarity reversal and transient overvoltages.
For engineers reviewing the RBO40-40G-TR datasheet, RBO40-40G-TR pinout, RBO40-40G-TR application, or RBO40-40G-TR equivalent, key selection criteria include verified 40 A continuous conduction capability, dual Transil clamping thresholds (24–35 V breakdown), junction-to-case thermal resistance of 1.0 °C/W, and D2PAK mechanical compatibility with high-power automotive PCB layouts.
Technical Context
This device implements three co-integrated protection functions on one silicon die: a 40 A forward-biased diode (D1) blocking reverse battery connection; a T1 Transil rated for negative transients up to −40 V clamping; and a T2 Transil handling positive load dump surges up to +80 V with 1500 W peak pulse power (10/1000 µs). All functions share common terminals and thermal path.
It operates across −40 °C to +150 °C junction temperature, with leakage currents ≤10 µA at 20 V standoff and capacitance values of 3000 pF (T1) and 8000 pF (T2) at 1 MHz/0 V bias. The monolithic structure eliminates inter-device timing skew and ensures matched thermal response during multi-pulse load dump events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| DC Forward Current (D1) | 40 A at Tc = 75°C - supports continuous motor drive supply rail protection without derating |
| Clamping Voltage (T1/T2) | ±40 V max at Ipp = 37.5 A / 20 A - limits downstream IC stress during ISO 7637-2 Pulse 5 |
| Breakdown Voltage (T1/T2) | 24–35 V min/max at IR = 1 mA - defines safe operating margin below 14 V/28 V automotive nominal rails |
| Peak Pulse Power (T2) | 1500 W (10/1000 µs) - sustains full-load-dump energy without failure |
| Junction-to-Case Thermal Resistance | 1.0 °C/W - enables direct heatsink mounting for sustained 40 A operation |
| Capacitance (T2) | 8000 pF at 1 MHz/0 V - provides low-impedance shunt path for fast transients while avoiding signal integrity issues |
| Storage Temperature Range | −40 to +150 °C - qualified for under-hood deployment in passenger and commercial vehicles |
Pinout & Package
Package: D2PAK (TO-263), surface-mount, isolated tab (Pin 2 = GND / thermal pad).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Input (Battery Anode) | Connects to vehicle battery positive; feeds D1 anode and T2 cathode |
| Pin 2 | GND / Tab | Common cathode for D1, anode for T1, and thermal interface to PCB copper pour |
| Pin 3 | Output (Load) | Supplies protected circuitry; connects to D1 cathode and T1 cathode |
Key Features
| Feature | Design Value |
|---|---|
| Monolithic triple-function integration | Eliminates discrete component matching errors and layout-induced timing mismatches between diode and Transil paths |
| ISO/DTR 7637 Pulse 5 compliance | Validated for 5×80 V load dump pulses at 60 s intervals - meets OEM ECU qualification requirements |
| 1.0 °C/W Rth(j-c) | Enables >40 A DC conduction with <40 °C junction rise above heatsink at 75 °C case temp |
| 8000 pF T2 capacitance | Provides sub-10 ns response to fast transients while maintaining impedance below 20 Ω at 100 kHz |
| −40 °C to +150 °C operation | Supports placement near engine compartments or power inverters without external derating |
Applications
| Engine Control Unit (ECU) Power Input | Electric Power Steering (EPS) Motor Driver |
|---|---|
Use Scenario: Protects MCU, CAN transceivers, and analog sensors from battery reversal and alternator load dump spikes. IC Role / Device Role / Timing Role: Acts as primary front-end clamp and polarity guard before LDOs and DC-DC converters. Use Value: Prevents latch-up or gate oxide rupture in 3.3 V/5 V logic by limiting input rail to ≤40 V during 80 V transients. | Use Scenario: Secures half-bridge gate drivers and current sense amplifiers in 12 V EPS systems. IC Role / Device Role / Timing Role: Supplies isolated, clamped power to high-side driver ICs while sinking load dump energy into chassis ground. Use Value: Enables direct connection of motor phase outputs to battery rail without external TVS cascading or series fusing. |
| Body Control Module (BCM) Power Distribution | Automotive HVAC Blower Motor Controller |
Use Scenario: Guards multiple switched 12 V loads (windows, locks, lighting) against shared bus transients. IC Role / Device Role / Timing Role: Functions as centralized rail protector upstream of individual load switches. Use Value: Reduces BOM count by replacing three discrete TVS+diode combos with one monolithic solution. | Use Scenario: Shields PWM controller ICs and Hall-effect position sensors from commutation spikes and battery reversal during jump-starts. IC Role / Device Role / Timing Role: Serves as bidirectional surge limiter on main motor supply line with integrated reverse polarity blocking. Use Value: Maintains functional safety integrity (ASIL-B capable) by preventing single-point failure modes in blower subsystems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive overvoltage and reverse-battery protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SM712-TR | Separate bipolar TVS (±13.3 V breakdown); no integrated diode; SO-8 package | Limited to low-current signal lines; cannot handle 40 A DC load current | Select only for data-line protection where power rail conduction is handled separately |
| TPD2E001DRYR | Low-capacitance ESD array (12 pF); 5.5 V working voltage; no load dump rating | Designed for USB/CAN ESD only; not rated for ISO 7637 transients or reverse battery | Use exclusively for secondary interface-level protection behind primary RBO stage |
Compared with SM712-TR and TPD2E001DRYR, RBO40-40G-TR uniquely combines high-current conduction, dual-polarity clamping, and load dump immunity in one monolithic device-enabling simplified front-end architecture without cascaded protection stages or thermal management compromises.
Availability
RBO40-40G-TR is available at Aetrix Electronics and suitable for automotive engine control units, electric power steering systems, and body control modules requiring stable component supply with full ISO 7637-2 compliance and long-term production continuity.
Supply support for RBO40-40G-TR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power management solutions with vertical manufacturing and AEC-Q100 qualification capabilities.
RBO40-40G-TR belongs to ST's Application Specific Discretes (A.S.D.)™ portfolio, engineered specifically for integrated front-end protection in 12 V/24 V automotive power systems where space, reliability, and transient robustness are critical.
FAQ
What is the maximum continuous current the RBO40-40G-TR can conduct in forward bias?
The device supports 40 A DC forward current at case temperature Tc = 75°C, verified per IF rating in the Absolute Maximum Ratings table. Derating is required above 75°C case temperature per the thermal resistance Rth(j-c) = 1.0 °C/W and junction limit of +150 °C. At Tc = 100°C, maximum sustainable current drops to approximately 25 A.
Does RBO40-40G-TR meet ISO 7637-2 Pulse 5 test requirements?
Yes - the device is explicitly designed and tested to withstand five 80 V load dump pulses (10/1000 µs waveform) with 60 s intervals, as defined in ISO/DTR 7637. Clamping voltage remains ≤40 V during each pulse, and the monolithic structure ensures no parameter drift or failure mode shift across all five cycles.
How is Pin 2 used electrically and thermally?
Pin 2 is the metal tab, internally connected to the cathodes of D1 and T1, and the anode of T2. It serves as the common reference node (GND) and primary thermal path. For optimal performance, it must be soldered to a minimum 200 mm² copper pour with ≥4 thermal vias to internal ground planes to maintain Rth(j-c) ≤1.0 °C/W.
Can RBO40-40G-TR replace discrete diode + TVS combinations in new designs?
Yes - its monolithic integration replicates the electrical behavior of a 40 A Schottky diode plus two bidirectional TVS devices, but with matched thermal response, zero layout-induced delay skew, and guaranteed parameter correlation. ST provides validated reference layouts and SPICE models confirming functional equivalence in load dump and reverse-battery fault conditions.
RBO40-40G-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Series:
- RBO
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 20V
- Voltage - Breakdown (Min):
- 24V
- Voltage - Clamping (Max) @ Ipp:
- 40V
- Current - Peak Pulse (10/1000µs):
- 20A, 37.5A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- D2PAK
RBO40-40G-TR FAQ
1.How can I place an order for RBO40-40G-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for RBO40-40G-TR 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 RBO40-40G-TR reliable?
The price and inventory of RBO40-40G-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RBO40-40G-TR is usually 5 days.
3.What payment methods are accepted for RBO40-40G-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RBO40-40G-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RBO40-40G-TR?
RBO40-40G-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RBO40-40G-TR 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 RBO40-40G-TR?
For technical support, including RBO40-40G-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RBO40-40G-TR requirements.
6.How does Aetrix verify that RBO40-40G-TR is sourced from the original manufacturer or authorized distributors?
All RBO40-40G-TR 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 RBO40-40G-TR meets industry standards.
7.What is the process for return or replacement of RBO40-40G-TR?
All RBO40-40G-TR units undergo pre-shipment inspection (PSI). If there is an issue with RBO40-40G-TR, 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 RBO40-40G-TR part is unused and in its original packaging.
Return procedure for RBO40-40G-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RBO40-40G-TR Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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