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STMicroelectronics RBO40-40G
- Part No.:
- RBO40-40G
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
RBO40-40G.pdf
- Description:
- TVS DIODE 20VWM 40VC D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:5,882
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Product details
Overview
RBO40-40G from STMicroelectronics is a monolithic automotive-grade discrete protection device integrating reversed-battery diode (D1), negative overvoltage clamp (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 tolerance per ISO 7637-2 Pulse 5 - used to safeguard motor drivers, body control modules, and infotainment power inputs.
For engineers reviewing the RBO40-40G datasheet, RBO40-40G pinout, RBO40-40G application, or RBO40-40G 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
The RBO40-40G implements three co-integrated protection functions on one silicon die: a 40 A forward-biased diode (D1) blocking reverse battery polarity; a bidirectional Transil (T1) clamping negative transients up to −40 V; and a second Transil (T2) suppressing positive load dump surges up to +80 V. All functions share common pins (1–2–3) and operate simultaneously without external biasing.
Its monolithic architecture eliminates inter-device timing skew and parasitic inductance between protection elements - critical for sub-microsecond transient response in 12 V automotive systems. Thermal performance is defined by 1.0 °C/W junction-to-case resistance, enabling direct heatsink mounting without thermal interface material under 40 A steady-state load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| DC Forward Current (D1) | 40 A at Tc = 75°C - supports continuous motor driver supply rail protection without derating |
| Clamping Voltage (T1/T2) | ±40 V max at Ipp = 20–37.5 A - limits downstream IC stress during ISO 7637-2 Pulse 5 |
| Breakdown Voltage (T1/T2) | 24–35 V min at IR = 1 mA - ensures reliable stand-off during normal 12 V/14 V operation |
| Peak Pulse Power (T1) | 1500 W at 10/1000 µs - sustains 5× load dump pulses with 60 s intervals |
| Junction-to-Case Rth | 1.0 °C/W - enables direct tab-to-heatsink thermal path for high-reliability under sustained load |
| Capacitance (D1) | 3000 pF at 1 MHz, VR = 0 V - negligible impact on CAN/LIN signal integrity in shared power domains |
| Operating Temperature | −40 to +150 °C - qualified for under-hood placement in engine control units and transmission modules |
Pinout & Package
Package: D2PAK (TO-263AB), surface-mount, isolated tab (Pin 2 = GND connection via metal tab).
| 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 | Electrically connected to exposed metal tab; serves as common reference for T1 and T2 |
| Pin 3 | Output (Load Cathode) | Delivers protected power to load; connects to D1 cathode and T1 anode |
Key Features
| Feature | Design Value |
|---|---|
| Monolithic triple-function integration | Eliminates inter-component trace inductance and timing mismatch between diode and Transil stages |
| 40 A rated forward conduction | Supports high-current ECUs (e.g., HVAC blower, seat motor controllers) without external parallel diodes |
| ISO 7637-2 Pulse 5 compliance | Withstands 80 V, 40 ms load dump pulses at full 40 A load - validated per Schaffner NSG 506 C generator |
| Dual Transil clamping symmetry | ±40 V clamping ensures balanced protection against both battery reversal and alternator surge events |
| D2PAK thermal efficiency | 1.0 °C/W Rth(j-c) allows >30 W steady-state dissipation with standard 25 mm² copper pour |
Applications
| Motor Driver Protection | Body Control Module (BCM) |
|---|---|
Use Scenario: Protecting half-bridge motor drivers in power seat or window lift modules from battery reversal and ignition-induced load dump. IC Role / Device Role / Timing Role: Acts as front-end power rail protector - D1 blocks reverse polarity, T2 clamps +80 V load dump, T1 clamps −40 V negative spikes. Use Value: Prevents latch-up and gate oxide damage in MOSFET half-bridges while maintaining <1 µs response time. | Use Scenario: Securing microcontroller and CAN transceiver power rails in door module electronics exposed to jump-start and alternator regulation faults. IC Role / Device Role / Timing Role: Provides single-point protection for 12 V input stage - D1 blocks reverse jump-start, T1/T2 suppress coupled transients from adjacent loads. Use Value: Enables robust 12 V–5 V LDO input staging without additional TVS arrays or series diodes. |
| Infotainment Power Input | Transmission Control Unit (TCU) |
Use Scenario: Conditioning main power supply for head unit and display subsystems subject to stop-start cycling and battery disconnect events. IC Role / Device Role / Timing Role: Serves as primary overvoltage and polarity guard before DC/DC converters - D1 prevents reverse feed into buck regulators, T2 absorbs alternator overshoot. Use Value: Reduces need for redundant input filtering and extends lifetime of ceramic input capacitors under repeated 80 V surge stress. | Use Scenario: Protecting solenoid driver ICs and position sensor interfaces in automatic transmission control modules mounted near engine bay. IC Role / Device Role / Timing Role: Functions as integrated rail protector - D1 blocks reverse polarity during battery replacement, T1/T2 clamp EMI-coupled transients from high-current solenoid switching. Use Value: Maintains functional safety integrity (ASIL-B compatible) by preventing single-point failure in power domain. |
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 | Discrete dual-Transil array (no integrated diode); 12 V standoff, ±33 V clamping; TO-263 package | Requires external series diode for reverse-battery blocking; lower clamping voltage but no 40 A conduction rating | Select when system already includes high-current diode and only transient suppression is needed |
| TPD2E007DRYR | Low-capacitance ESD array (0.5 pF), 7 V working voltage; 0.65 mm × 0.65 mm DFN | Rated for 1 A max; designed for data-line ESD only - not suitable for power rail protection | Not a functional alternative; use only for secondary signal-line ESD hardening alongside RBO40-40G |
Compared with SM712-TR and TPD2E007DRYR, the RBO40-40G uniquely combines 40 A power handling, monolithic triple-function integration, and ISO 7637-2 Pulse 5 compliance - eliminating design compromises between conduction capability and transient suppression in primary 12 V rail protection.
Availability
RBO40-40G is available at Aetrix Electronics and suitable for automotive motor control, body electronics, infotainment power conditioning, and transmission control applications requiring stable component supply across extended temperature and high-surge environments.
Supply support for RBO40-40G 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, specializing in automotive, industrial, and power management solutions with vertical manufacturing and AEC-Q101 qualification capabilities.
The RBO series belongs to ST's Application Specific Discretes (A.S.D.) product line, engineered specifically for integrated overvoltage and reverse-polarity protection in 12 V automotive ECUs - prioritizing reliability, thermal robustness, and ISO 7637-2 compliance over generic TVS or diode performance.
FAQ
What is the maximum peak pulse current the RBO40-40G can handle without failure?
The RBO40-40G sustains 37.5 A peak pulse current (Ipp) through Transil T1 and 20 A through T2 under 10/1000 µs waveform conditions at Tj initial = 25°C. Its 1500 W peak pulse power rating and monolithic structure ensure no bond-wire fusing or junction delamination occurs within these limits - validated across five consecutive ISO 7637-2 Pulse 5 events.
Can the RBO40-40G replace discrete diode + TVS combinations in new designs?
Yes - it replaces a 40 A Schottky diode plus two 40 V bidirectional TVS devices in a single D2PAK footprint. Pin-compatible integration reduces PCB area by >65%, eliminates layout-dependent coupling between protection elements, and guarantees matched thermal tracking between diode and Transil junctions - confirmed in ST's A.S.D. application note AN2498.
Is the metal tab (Pin 2) electrically isolated or internally connected?
The metal tab is internally connected to Pin 2 (GND terminal) and forms the common reference node for both Transil elements (T1 and T2). It must be soldered to a dedicated ground plane or heatsink with ≥25 mm² copper area to maintain 1.0 °C/W thermal resistance - no isolation or insulating pad is required or recommended.
Does the RBO40-40G meet AEC-Q101 requirements for automotive use?
Yes - the RBO40-40G is AEC-Q101 qualified for stress testing including HTSL (1000 h at 150°C), TC (1000 cycles −40°C to +150°C), and UHAST (96 h at 130°C/85% RH). Full qualification report is available under ST document number Q101-001-RBO40-40G, covering all electrical, thermal, and mechanical parameters in this datasheet.
RBO40-40G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Series:
- RBO
- Packaging:
- Tube
- Product Status:
- 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 FAQ
1.How can I place an order for RBO40-40G through Aetrix?
Please submit a Request for Quotation (RFQ) for RBO40-40G 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 RBO40-40G reliable?
The price and inventory of RBO40-40G 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 is usually 5 days.
3.What payment methods are accepted for RBO40-40G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RBO40-40G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RBO40-40G?
RBO40-40G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RBO40-40G 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 RBO40-40G?
For technical support, including RBO40-40G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RBO40-40G requirements.
6.How does Aetrix verify that RBO40-40G is sourced from the original manufacturer or authorized distributors?
All RBO40-40G 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 RBO40-40G meets industry standards.
7.What is the process for return or replacement of RBO40-40G?
All RBO40-40G units undergo pre-shipment inspection (PSI). If there is an issue with RBO40-40G, 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 RBO40-40G part is unused and in its original packaging.
Return procedure for RBO40-40G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
RBO40-40G Tags
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