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STMicroelectronics RBO08-40G-TR
- Part No.:
- RBO08-40G-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
RBO08-40G-TR.pdf
- Description:
- TVS DIODE 20VWM 40VC D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:5,911
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Product details
Overview
RBO08-40G-TR from STMicroelectronics is a monolithic automotive-grade discrete protection device integrating reversed battery protection (D1 diode), negative overvoltage clamping (T1 Transil), and positive overvoltage clamping (T2 Transil) in a single D2PAK package. It delivers 8 A DC forward current, ±40 V max clamping voltage, 24 V min breakdown voltage, and complies with ISO/DTR 7637 pulses 1, 2, 3a, and 3b for use in alternator-protected vehicle electronics.
For engineers reviewing the RBO08-40G-TR datasheet, RBO08-40G-TR pinout, RBO08-40G-TR application, or RBO08-40G-TR equivalent, key selection criteria include its triple-function integration, 600 W/1500 W dual pulse power rating, junction-to-case thermal resistance of 2.4 °C/W, and validated performance across -40°C to +150°C ambient.
Technical Context
The RBO08-40G-TR implements three co-integrated protection functions on one silicon die: a forward-biased 8 A diode (D1) for reverse polarity blocking, a bidirectional Transil (T1) for negative surge clamping up to 40 V, and a second Transil (T2) for positive surge clamping also up to 40 V. Its monolithic structure eliminates inter-device timing skew and ensures matched thermal behavior.
It operates under automotive transients per ISO/DTR 7637: Pulse 1 (inductive load dump), Pulse 2 (load dump interruption), Pulse 3a/3b (capacitive coupling and supply line noise). The device fails short-circuit under overstress, enabling downstream fuse coordination and predictable fault containment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| DC Forward Current (D1) | 8 A at Tc = 75°C - supports continuous power rail protection in engine control units |
| Clamping Voltage (T1/T2) | ±40 V max at 10/1000 µs - limits transient energy to safe levels for downstream ASICs and MCUs |
| Breakdown Voltage | 24 V min at IR = 1 mA - ensures reliable stand-off during nominal 12 V/24 V battery operation |
| Peak Pulse Power (T1) | 600 W - handles ISO 7637 Pulse 1 surges without degradation |
| Peak Pulse Power (T2) | 1500 W - withstands high-energy ignition and relay-switching transients |
| Junction-to-Case Thermal Resistance | 2.4 °C/W - enables direct heatsinking to PCB copper or chassis for sustained 8 A conduction |
| Operating Temperature Range | -40°C to +150°C - qualified for under-hood automotive environments including alternator proximity |
Pinout & Package
Package: D2PAK (TO-263), surface-mount, thermally enhanced plastic case with exposed tab acting as Pin 2 (GND). Tab is electrically connected to terminal 2 and serves as primary heat path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Input (Battery Side) | Anode of D1 diode; connects to vehicle battery feed before protected load |
| Pin 2 | GND / Tab | Cathode of T1, anode of T2, and thermal reference node; must be soldered to large copper pour |
| Pin 3 | Output (Load Side) | Cathode of D1, cathode of T2, and anode of T1; feeds protected electronic module |
Key Features
| Feature | Design Value |
|---|---|
| Triple integrated protection | Single-die combination of reverse-battery diode + dual Transil clamps eliminates board space and BOM count vs. discrete solutions |
| ISO/DTR 7637 compliance | Validated for Pulses 1, 2, 3a, and 3b - meets OEM ECU immunity requirements without external filtering |
| Monolithic reliability | No wire bonds or interconnects between functions - eliminates failure modes associated with multi-chip assemblies |
| Short-circuit fail-safe mode | Fails closed under overstress, allowing upstream fuse to clear fault and prevent fire hazard in wiring harnesses |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) Supply Protection |
|---|---|
Use Scenario: ECU powered directly from vehicle battery with exposure to load dump, jump-start reversal, and alternator ripple. IC Role / Device Role / Timing Role: Primary front-end protection device handling both polarity reversal and bidirectional transients before LDOs and microcontrollers. Use Value: Eliminates need for separate TVS diodes and series diodes, reducing component count by ≥3 while maintaining <40 V clamping under 37.5 A pulse. | Use Scenario: BCM powering door locks, lighting, and sensors in 12 V architecture with intermittent ground faults and relay-induced spikes. IC Role / Device Role / Timing Role: Standalone protection IC placed at main power entry point, coordinating with system fusing. Use Value: Withstands 1500 W positive surges (Pulse 2a) and 600 W negative surges (Pulse 1), ensuring uninterrupted operation during door actuation cycles. |
| Motor Driver Power Stage | Infotainment Head Unit Power Rail |
Use Scenario: H-bridge motor driver supplied via battery rail with inductive kickback from brushed DC motors. IC Role / Device Role / Timing Role: Bidirectional clamp (T1 for negative flyback, T2+D1 for positive flyback) protecting gate drivers and current sense amplifiers. Use Value: Clamps negative transients to ≤40 V at 15 A (T1), preventing latch-up in half-bridge controllers during motor coasting. | Use Scenario: High-reliability infotainment unit requiring immunity to cold-cranking dips and jump-start overvoltages. IC Role / Device Role / Timing Role: First-line defense against battery reversal during service and ISO 7637 Pulse 3b capacitive coupling events. Use Value: Maintains 24 V min breakdown margin above 16 V cold-crank minimum, ensuring no false triggering during cranking. |
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-TP | Bi-directional TVS only (no integrated diode); 12 V standoff, 33 V clamping; SOT-23 package | Lacks reverse-battery blocking function; requires external series diode for polarity protection | Select when board space is critical and reverse-battery risk is mitigated elsewhere in design |
| TPD2E007DRYR | Low-capacitance ESD array (0.5 pF/channel); 7 V working voltage; not rated for ISO 7637 or automotive power rail transients | Designed for data-line ESD only; unsuitable for power rail surge suppression | Not a functional substitute; use only for CAN/LIN bus line protection alongside RBO08-40G-TR |
Compared with SM712-TP and TPD2E007DRYR, the RBO08-40G-TR uniquely integrates reverse-battery diode + dual Transil clamps in one automotive-qualified package, delivering coordinated protection against all major ISO 7637 threats without external components or layout compromises.
Availability
RBO08-40G-TR is available at Aetrix Electronics and suitable for engine control units, body control modules, motor driver power stages, and infotainment head units requiring stable component supply across extended automotive product lifecycles.
Supply support for RBO08-40G-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, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.
The RBO series belongs to ST's Automotive Protection Discretes portfolio, engineered specifically to replace multi-component protection schemes in 12 V/24 V vehicle electronics with monolithic, ISO 7637-compliant solutions.
FAQ
What is the maximum continuous current the RBO08-40G-TR can handle?
The RBO08-40G-TR supports 8 A DC forward current at case temperature (Tc) of 75°C, verified per datasheet absolute maximum ratings. Derating is required above 75°C case temperature; at 100°C Tc, maximum sustainable current drops to approximately 5.6 A based on thermal resistance (2.4 °C/W) and 150°C max junction limit.
Does RBO08-40G-TR require a heatsink?
Yes - the D2PAK package relies on thermal conduction through Pin 2 (tab) to PCB copper. For 8 A continuous operation, a minimum 400 mm² 2-oz copper pad connected to internal ground planes is required. Without adequate copper area, junction temperature exceeds 150°C within seconds under full load.
Can RBO08-40G-TR protect against load dump events?
Yes - it is explicitly rated for ISO/DTR 7637 Pulse 1 (load dump), with 600 W peak pulse power capability for T1 and 1500 W for T2 at 10/1000 µs waveform. Its 40 V clamping voltage limits downstream voltage stress during 12 V system load dumps up to 37.5 A peak current.
How does RBO08-40G-TR behave during battery reversal?
During battery reversal, the integrated D1 diode blocks current flow - no conduction occurs between Pin 1 and Pin 3. Leakage remains below 10 µA at -20 V reverse bias (per datasheet IRM31/IRM32), preventing power loss or damage to downstream circuitry while maintaining zero forward drop in normal operation.
RBO08-40G-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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 2
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 20V
- Voltage - Breakdown (Min):
- 35V
- Voltage - Clamping (Max) @ Ipp:
- 40V
- Current - Peak Pulse (10/1000µs):
- 37.5A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 1000pF @ 1MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- D2PAK
RBO08-40G-TR FAQ
1.How can I place an order for RBO08-40G-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for RBO08-40G-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 RBO08-40G-TR reliable?
The price and inventory of RBO08-40G-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RBO08-40G-TR is usually 5 days.
3.What payment methods are accepted for RBO08-40G-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RBO08-40G-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RBO08-40G-TR?
RBO08-40G-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RBO08-40G-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 RBO08-40G-TR?
For technical support, including RBO08-40G-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RBO08-40G-TR requirements.
6.How does Aetrix verify that RBO08-40G-TR is sourced from the original manufacturer or authorized distributors?
All RBO08-40G-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 RBO08-40G-TR meets industry standards.
7.What is the process for return or replacement of RBO08-40G-TR?
All RBO08-40G-TR units undergo pre-shipment inspection (PSI). If there is an issue with RBO08-40G-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 RBO08-40G-TR part is unused and in its original packaging.
Return procedure for RBO08-40G-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RBO08-40G-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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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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