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STMicroelectronics SMB6F188AY
- Part No.:
- SMB6F188AY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-221AA, SMB Flat Leads
- Datasheet:
-
SMB6F188AY.pdf
- Description:
- TVS DIODE 188VWM 328VC SMBFLAT
- Quantity:
- Payment:
- Shipping:
Inventory:7,515
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Product details
Overview
SMB6F188AY from STMicroelectronics is an AEC-Q101-qualified unidirectional automotive TVS diode in SMB Flat package, designed to clamp transient overvoltages up to 328 V (10/1000 µs) with 48.5 A peak pulse current and 2 µA max leakage at 25 °C. It delivers 600 W peak pulse power (10/1000 µs) and 4 kW (8/20 µs), operating up to 175 °C junction temperature for engine control unit (ECU) power rail protection.
For engineers reviewing the SMB6F188AY datasheet, SMB6F188AY pinout, SMB6F188AY application, or SMB6F188AY equivalent, key selection criteria include clamping voltage (328 V @ 48.5 A), stand-off voltage (188 V), low leakage (<1 µA at 85 °C), ISO 7637-2 Pulse 1/2a/3a compliance, and flat 1 mm profile for space-constrained under-hood layouts.
Technical Context
This TVS diode uses planar silicon technology to achieve stable breakdown behavior across -55 °C to +175 °C, with temperature coefficient αT = 10.8 × 10−4/°C for both VBR and VCL. Its dynamic resistance of 15.2 Ω (at 10/1000 µs) enables predictable clamping response during fast transients like ISO 10605 ESD events.
It meets IEC 61000-4-4 Level 4 (±4 kV), exceeds ISO 10605 Level 4 (±30 kV air/contact discharge), and supports ISO 7637-2 Pulse 1 (−150 V), Pulse 2a (+112 V), Pulse 3a (−220 V), and Pulse 3b (+150 V) - all critical for 12 V automotive battery line protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 188 V - maximum continuous reverse working voltage before conduction begins |
| Breakdown Voltage (VBR) | 209–231 V @ IBR = 1 mA - precise avalanche threshold enabling accurate overvoltage detection |
| Clamping Voltage (VCL) | 328 V @ IPP = 48.5 A (10/1000 µs) - limits downstream circuit stress during surge events |
| Peak Pulse Power (PPP) | 600 W (10/1000 µs), 4 kW (8/20 µs) - sustains high-energy transients without failure |
| Leakage Current (IR) | 0.2 µA @ 25 °C, 1 µA @ 85 °C - minimizes standby power loss in always-on vehicle modules |
| Junction Temperature Range | −55 °C to +175 °C - supports operation in under-hood environments near engines or power converters |
| Dynamic Resistance (RD) | 15.2 Ω - defines VCL rise slope under surge current, critical for voltage margining |
Pinout & Package
SMB6F188AY is housed in an SMB Flat package (JEDEC DO-214AA), measuring 3.30–3.95 mm × 5.20–5.60 mm × 0.90–1.10 mm height, with matte tin-plated leads compliant to J-STD-002 and MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Marked Band) | Surge current sink node | Connected to protected line; conducts during positive transients on anode side |
| Anode | Reference/ground return path | Typically tied to chassis or battery ground; completes clamping loop during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness |
| Flat 1 mm profile | Enables PCB stacking and reduces mechanical interference in tight engine bay assemblies |
| Low leakage at elevated Tj | 1 µA @ 85 °C ensures minimal parasitic loading on always-on CAN/LIN bus lines |
| ISO 7637-2 Pulse 3b support | +150 V clamping capability protects against load dump-induced positive spikes on 12 V systems |
| UL94 V0 flammability rating | Meets automotive interior material safety requirements for under-dash applications |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) LIN Bus Line |
|---|---|
|
Use Scenario: Protects 12 V supply input of diesel/gasoline ECU against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamps positive surges above 188 V while blocking reverse leakage. Use Value: Withstands ISO 7637-2 Pulse 3b (+150 V) and maintains <1 µA leakage at 85 °C to preserve microcontroller sleep current budget. |
Use Scenario: Shields LIN transceiver PHY layer from ESD and coupled noise on vehicle body wiring harnesses. IC Role / Device Role / Timing Role: Fast-response TVS suppresses ±30 kV contact discharge per ISO 10605 without signal distortion. Use Value: 328 V clamping voltage provides >100 V margin above LIN's 12 V nominal, preventing transceiver latch-up during ESD events. |
| Advanced Driver Assistance Systems (ADAS) Camera Power | Electric Power Steering (EPS) Motor Driver Supply |
|
Use Scenario: Guards image sensor module power rail against ignition-induced transients in front-end camera systems. IC Role / Device Role / Timing Role: Clamps 8/20 µs lightning-like surges (4 kW) within 1 ns response time to prevent pixel corruption. Use Value: 15.2 Ω dynamic resistance ensures predictable VCL rise, enabling accurate overvoltage margining for 3.3 V/5 V imaging ICs. |
Use Scenario: Safeguards H-bridge gate driver supply against inductive kickback from EPS motor commutation. IC Role / Device Role / Timing Role: Absorbs repetitive 10/1000 µs pulses up to 600 W without thermal runaway at 175 °C Tj. Use Value: High junction temperature rating allows placement near motor driver ICs, reducing trace inductance and improving surge suppression efficacy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ188A | Same 188 V VRM, but 600 W PPP only at 25 °C; derates to ~300 W at 125 °C; no AEC-Q101 certification | Limited to non-automotive industrial use; lacks ISO 7637-2 Pulse 3a/b validation | Select when cost sensitivity outweighs automotive qualification and high-Tj performance |
| SMCJ188A | Higher 1500 W PPP (10/1000 µs), but larger SMC package (7.11 × 6.22 mm); same VRM/VCL specs | Requires more PCB area; suitable where surge energy exceeds 600 W but layout permits larger footprint | Choose for heavy-duty commercial vehicle applications needing higher single-pulse energy absorption |
Compared with SMBJ188A and SMCJ188A, SMB6F188AY uniquely combines AEC-Q101 qualification, 175 °C operation, flat 1 mm profile, and full ISO 7637-2 compliance - making it optimal for space-constrained, high-reliability automotive electronics where thermal and mechanical constraints dominate.
Availability
SMB6F188AY is available at Aetrix Electronics and suitable for engine control units, ADAS camera modules, body control modules, and electric power steering systems requiring stable component supply across extended automotive lifecycles.
Supply support for SMB6F188AY 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 discrete technologies with vertical manufacturing capabilities.
SMB6FxxAY belongs to ST's automotive-grade TVS diode product line, engineered specifically for robust transient suppression in 12 V and 24 V vehicle electrical architectures per ISO 7637 and ISO 10605 standards.
FAQ
What is the maximum clamping voltage of SMB6F188AY under a 10/1000 µs surge?
The maximum clamping voltage is 328 V at 48.5 A peak pulse current for a 10/1000 µs waveform, measured at Tamb = 25 °C. This value increases with junction temperature at a rate defined by αT = 10.8 × 10−4/°C, reaching approximately 345 V at Tj = 125 °C per datasheet calculation.
Does SMB6F188AY meet ISO 7637-2 Pulse 1 requirements?
Yes - SMB6F188AY is validated for ISO 7637-2 Pulse 1 (−150 V, 50 Ω source impedance, 12 V battery system). Its 188 V stand-off voltage and 328 V clamping voltage provide sufficient margin to suppress this negative-going transient without conduction during normal operation.
Can SMB6F188AY be used in 24 V automotive systems?
No - SMB6F188AY is rated for 188 V stand-off and intended for 12 V battery systems. For 24 V applications, ST recommends higher-VRM variants such as SMB6F250AY (250 V VRM) which maintain equivalent AEC-Q101 qualification and thermal performance.
What is the recommended PCB footprint for SMB6F188AY?
The manufacturer specifies a footprint with 5.84 mm pad length, 3.44 mm pad width, and 2.07 mm center-to-center spacing between pads. Copper area under each lead should be ≥1 cm² to achieve Rth(j-a) ≤ 150 °C/W and sustain 600 W pulse power without exceeding Tj = 175 °C.
SMB6F188AY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-221AA, SMB Flat Leads
- Series:
- SMB6FxxAY
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 188V
- Voltage - Breakdown (Min):
- 209V
- Voltage - Clamping (Max) @ Ipp:
- 328V
- Current - Peak Pulse (10/1000µs):
- 2A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMBflat
SMB6F188AY FAQ
1.How can I place an order for SMB6F188AY through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB6F188AY 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 SMB6F188AY reliable?
The price and inventory of SMB6F188AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB6F188AY is usually 5 days.
3.What payment methods are accepted for SMB6F188AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB6F188AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB6F188AY?
SMB6F188AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB6F188AY 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 SMB6F188AY?
For technical support, including SMB6F188AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB6F188AY requirements.
6.How does Aetrix verify that SMB6F188AY is sourced from the original manufacturer or authorized distributors?
All SMB6F188AY 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 SMB6F188AY meets industry standards.
7.What is the process for return or replacement of SMB6F188AY?
All SMB6F188AY units undergo pre-shipment inspection (PSI). If there is an issue with SMB6F188AY, 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 SMB6F188AY part is unused and in its original packaging.
Return procedure for SMB6F188AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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