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STMicroelectronics RBO08-40G
- Part No.:
- RBO08-40G
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
RBO08-40G.pdf
- Description:
- TVS DIODE 20VWM 40VC D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:141
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Product details
Overview
RBO08-40G 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, 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 datasheet, RBO08-40G pinout, RBO08-40G application, or RBO08-40G equivalent, key selection criteria include its triple-function integration, 24 V min breakdown voltage, 600 W / 1500 W dual pulse power ratings, thermal resistance of 2.4 °C/W, and automotive-grade transient immunity per ISO 7637.
Technical Context
This device implements three co-integrated protection functions on one silicon die: a series-blocking diode (D1) for reverse polarity prevention, a bidirectional Transil (T1) for negative surge clamping, and a second Transil (T2) for positive surge suppression. Its monolithic structure ensures matched thermal behavior and precise voltage coordination between functions.
Clamping operation follows standard Transil avalanche behavior with temperature coefficients of 9 × 10⁻⁴/°C (T1) and 8.5 × 10⁻⁴/°C (T2); forward conduction of D1 enables low-loss battery feed while T1/T2 conduct during transients to limit voltage excursions to ≤40 V under 15 A (T1) and 37.5 A (T2) 10/1000 µs pulses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| DC Forward Current (D1) | 8 A at Tc = 75°C - supports continuous power rail feeding in automotive modules |
| Clamping Voltage (T1/T2) | ±40 V max at specified Ipp - limits transient overvoltage to safe levels for downstream ICs |
| Breakdown Voltage (T1/T2) | 24 V min at IR = 1 mA - defines minimum threshold before clamping activation |
| Peak Pulse Power (T1) | 600 W (10/1000 µs) - handles ISO 7637 pulse 1 & 3b energy without failure |
| Peak Pulse Power (T2) | 1500 W (10/1000 µs) - withstands high-energy ignition and relay-switching surges |
| Junction-to-Case Thermal Resistance | 2.4 °C/W - enables effective heatsinking via D2PAK tab mounting |
| Operating Temperature Range | −40°C to +150°C - qualified for under-hood automotive environments |
Pinout & Package
Package: D2PAK (TO-263), surface-mount with insulated tab; thermally optimized for PCB copper pour attachment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Input (Battery Side) | Anode of D1; cathode of T2; connects directly to vehicle battery or alternator output |
| Pin 2 | GND / Tab Connection | Common cathode node for T1 and anode for T2; electrically tied to metal tab for thermal and grounding path |
| Pin 3 | Output (Load Side) | Cathode of D1; anode of T1; feeds protected electronics with reverse-polarity immunity |
Key Features
| Feature | Design Value |
|---|---|
| Triple-function monolithic integration | Single-die co-location of D1 diode, T1 negative Transil, and T2 positive Transil eliminates inter-device timing skew and layout parasitics |
| ISO/DTR 7637 compliance | Validated against pulses 1 (load dump), 2 (supply interruption), 3a/3b (inductive switching) - meets OEM ECU requirements |
| Automotive alternator environment rating | Stable operation under sustained 14–16 V supply with load dump transients up to 40 V clamped peak |
| Thermal robustness | 150°C max junction temperature and 2.4 °C/W Rth(j-c) support high-power dissipation in compact layouts |
Applications
| Body Control Module (BCM) | Engine Control Unit (ECU) |
|---|---|
Use Scenario: Protects microcontroller power rails from battery reversal during jump-start or service disconnect. IC Role / Device Role / Timing Role: Series blocking diode (D1) prevents reverse current flow; T1/T2 clamp induced transients from solenoid drivers and CAN bus noise. Use Value: Eliminates need for separate TVS + series diode + fuse, reducing BOM count by 3 components and PCB area by >40 mm². | Use Scenario: Shields engine management ICs from alternator load dump and ignition coil flyback spikes. IC Role / Device Role / Timing Role: T2 clamps positive surges up to 1500 W; D1 conducts normal battery feed; T1 suppresses negative rebounds from inductive loads. Use Value: Maintains <40 V rail excursion during ISO 7637 pulse 1 (100 V, 40 ms), preventing latch-up or gate oxide damage in 5 V/3.3 V logic. |
| Motor Driver Module | Infotainment Power Supply |
Use Scenario: One half of H-bridge driver powered through RBO08-40G to isolate motor back-EMF coupling into MCU domain. IC Role / Device Role / Timing Role: D1 blocks reverse current during motor regenerative braking; T1 clamps negative flyback; T2 limits positive switching spikes. Use Value: Enables clean separation of noisy motor power domain from sensitive control logic, reducing conducted EMI by ≥15 dB in 1–100 MHz range. | Use Scenario: Secures USB-C and display power rails in head unit against battery disconnection transients and hot-swap events. IC Role / Device Role / Timing Role: D1 prevents reverse feed from backup capacitor during main battery loss; T1/T2 clamp both polarities of supply bounce. Use Value: Guarantees uninterrupted operation during 50 ms battery interruption (ISO pulse 2), avoiding system reset or audio dropout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar reversed battery and bidirectional overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SM712-TP | Discrete dual-Transil array (no integrated diode); requires external series diode for reverse battery protection | Lacks monolithic D1 function - needs additional 8 A Schottky and layout space | Select when existing design already includes discrete diode and only surge clamping is needed |
| TPD2E001DRYR | Low-capacitance ESD array (15 pF); rated only for IEC 61000-4-2, not ISO 7637 | Not suitable for automotive load dump or alternator transients; limited to board-level ESD | Use only for non-automotive consumer interfaces requiring sub-100 V clamping and <1 ns response |
Compared with SM712-TP and TPD2E001DRYR, RBO08-40G uniquely integrates all three protection functions in one automotive-qualified package, eliminating external component dependencies and ensuring coordinated transient response across battery reversal, negative, and positive surges - critical for functional safety-compliant ECUs.
Availability
RBO08-40G is available at Aetrix Electronics and suitable for body control modules, engine control units, motor driver modules, and infotainment power supplies requiring stable component supply across automotive production lifecycles.
Supply support for RBO08-40G 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, power, microcontroller, and automotive-grade components.
RBO08-40G belongs to ST's Application Specific Discretes (A.S.D.)™ portfolio, engineered specifically for integrated overvoltage and reverse-battery protection in harsh automotive electrical environments.
FAQ
What is the maximum continuous current the RBO08-40G can handle in forward conduction?
The RBO08-40G supports 8 A DC forward current at case temperature (Tc) of 75°C, verified per absolute maximum ratings. Derating applies above this temperature: at Tc = 100°C, maximum sustainable current drops to approximately 5.6 A based on thermal resistance (2.4 °C/W) and 150°C junction limit. This rating assumes adequate PCB copper area for heat spreading.
Does RBO08-40G meet ISO 7637-2 for automotive transient immunity?
Yes - RBO08-40G is explicitly designed and tested to comply with ISO/DTR 7637-2 for pulses 1 (load dump), 2 (supply interruption), and 3a/3b (inductive switching). Its ±40 V clamping voltage and 600 W / 1500 W pulse power ratings ensure full immunity to these standardized waveforms without degradation or failure.
Can RBO08-40G replace a discrete diode + TVS combination in new designs?
Yes - RBO08-40G replaces a typical 8 A Schottky diode plus dual TVS (positive/negative) with a single monolithic device. It provides tighter voltage coordination, matched thermal behavior, and reduced parasitic inductance versus discrete solutions. Layout simplification and improved surge response time are confirmed in ST's motor driver and ECU reference designs.
Is the D2PAK tab electrically isolated or connected internally?
The D2PAK metal tab is electrically connected to Pin 2 (GND), serving as the common cathode node for T1 and anode for T2. It is not insulated - PCB mounting must ensure this tab connects to system ground plane. Electrical isolation is not provided; creepage/clearance must be maintained externally per automotive safety standards.
RBO08-40G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Series:
- RBO
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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):
- 15A, 37.5A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- D2PAK
RBO08-40G FAQ
1.How can I place an order for RBO08-40G through Aetrix?
Please submit a Request for Quotation (RFQ) for RBO08-40G 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 reliable?
The price and inventory of RBO08-40G 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 is usually 5 days.
3.What payment methods are accepted for RBO08-40G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RBO08-40G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RBO08-40G?
RBO08-40G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RBO08-40G 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?
For technical support, including RBO08-40G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RBO08-40G requirements.
6.How does Aetrix verify that RBO08-40G is sourced from the original manufacturer or authorized distributors?
All RBO08-40G 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 meets industry standards.
7.What is the process for return or replacement of RBO08-40G?
All RBO08-40G units undergo pre-shipment inspection (PSI). If there is an issue with RBO08-40G, 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 part is unused and in its original packaging.
Return procedure for RBO08-40G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RBO08-40G Tags
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