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STMicroelectronics SMA6F6.5AY
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- Part No.:
- SMA6F6.5AY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-221AC, SMA Flat Leads
- Datasheet:
-
SMA6F6.5AY.pdf
- Description:
- TVS DIODE 6.5VWM 11.2VC SMAFLAT
- Quantity:
- Payment:
- Shipping:
Inventory:9,337
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Product details
Overview
SMA6F6.5AY from STMicroelectronics is an AEC-Q101-qualified unidirectional automotive TVS diode in SMA Flat package, designed to clamp transient overvoltages up to 11.2 V (10/1000 µs) at 56 A peak pulse current while maintaining low leakage (≤0.2 µA at 25 °C) and high junction temperature capability (175 °C). It delivers 600 W peak pulse power (10/1000 µs) and meets ISO 10605 ±30 kV ESD and ISO 7637-2 Pulse 1 (−150 V), 2a (+112 V), 3a (−220 V), and 3b (+150 V) for 12 V automotive battery systems.
For engineers reviewing the SMA6F6.5AY datasheet, SMA6F6.5AY pinout, SMA6F6.5AY application, or SMA6F6.5AY equivalent, this device is selected for robust front-end surge protection in automotive power line interfaces where stand-off voltage (6.5 V), clamping performance (11.2 V @ 56 A), thermal stability (Tj max = 175 °C), and flat 1 mm profile are critical design constraints.
Technical Context
This TVS diode uses planar silicon technology to achieve low dynamic resistance (0.057 Ω) and stable breakdown voltage (7.2–8.0 V) across temperature (αT = 6.1 × 10−4/°C). Its unidirectional configuration enables asymmetric clamping-forward conduction during negative transients (e.g., ISO 7637-2 Pulse 1 and 3a) and reverse avalanche during positive surges (e.g., Pulse 2a and 3b).
The SMA Flat package supports high-power dissipation via optimized thermal path: Rth(j-a) drops to ~120 °C/W with 4 cm² copper area per lead, and Zth(j-a) remains ≤100 °C/W for pulses ≥10 ms. It complies with J-STD-020 MSL Level 1 and IPC7531 footprint standards, enabling automated SMT assembly without moisture sensitivity concerns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 6.5 V - Maximum continuous reverse operating voltage before avalanche onset; sets minimum system operating margin above 5 V logic or sensor supply rails. |
| Breakdown Voltage (VBR) | 7.2–8.0 V @ 10 mA - Tight tolerance ensures predictable turn-on across production lots and temperature (−55 to +175 °C). |
| Clamping Voltage (VCL) | 11.2 V @ 56 A (10/1000 µs) - Limits downstream IC voltage stress during ISO 7637-2 Pulse 1 (−150 V) and Pulse 3a (−220 V) events. |
| Peak Pulse Power | 600 W (10/1000 µs), 4 kW (8/20 µs) - Supports high-energy transients common in automotive load-dump and inductive switching scenarios. |
| Leakage Current | ≤0.2 µA @ 25 °C, ≤1 µA @ 85 °C - Minimizes standby power loss in always-on vehicle modules (e.g., body control units, telematics). |
| Junction Temperature Range | −55 to +175 °C - Enables placement near hot engine compartments or under-hood ECUs without derating. |
| Dynamic Resistance (RD) | 0.057 Ω - Low impedance sustains clamping voltage stability under fast-rising surges (e.g., ESD contact discharge). |
Pinout & Package
SMA6F6.5AY is housed in a surface-mount SMA Flat package (JEDEC DO-214AC), measuring 2.90 mm × 5.35 mm × 1.10 mm with 1 mm profile height and matte tin-plated leads. The package features two terminals: cathode (marked band) and anode, compatible with IPC7531 standard footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked band) | Transient voltage reference node | Connected to protected line (e.g., CAN_H, LIN, 12 V rail); avalanche conduction occurs when line voltage exceeds VBR relative to ground/anode. |
| Anode | Ground return path | Typically tied to chassis or system ground; completes low-inductance surge current loop during clamping events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive under-hood use including temperature cycling, mechanical shock, and humidity testing per JESD22-B102 E3. |
| Flat 1 mm profile | Enables PCB stacking in space-constrained modules (e.g., ADAS camera housings, smart junction boxes) without interference with adjacent components. |
| ISO 10605 ±30 kV ESD immunity | Exceeds automotive ESD requirements for both contact and air discharge, eliminating need for external ESD filters in LIN/CAN physical layers. |
| Low dynamic resistance (0.057 Ω) | Reduces VCL rise under high di/dt transients, preserving voltage margin for 5 V microcontrollers and transceivers during ISO 7637-2 Pulse 2a (+112 V). |
| High Tj max (175 °C) | Supports operation in proximity to power MOSFETs or DC-DC converters without thermal shutdown or parameter drift. |
Applications
| Body Control Module (BCM) Power Input | CAN Transceiver Protection |
|---|---|
|
Use Scenario: 12 V battery feed to BCM microcontroller and peripheral drivers exposed to load dump and alternator ripple. IC Role / Device Role: Primary transient voltage suppressor on main power rail, placed upstream of DC-DC converter input. Use Value: Clamps ISO 7637-2 Pulse 1 (−150 V) to ≤11.2 V, preventing latch-up or gate oxide damage in downstream PMICs and MCU I/O. |
Use Scenario: CAN_H and CAN_L lines in automotive gateway or ECU subject to ESD and coupled transients from nearby high-current circuits. IC Role / Device Role: Unidirectional TVS pair (one per line) referenced to ground, absorbing differential and common-mode surges. Use Value: Limits VCL to 11.2 V during ±30 kV ESD events, ensuring CAN transceiver survives without bus fault or bit error accumulation. |
| LIN Bus Node Protection | Automotive Sensor Interface (e.g., ABS wheel speed) |
|
Use Scenario: LIN slave node (e.g., door module actuator) powered from vehicle battery and communicating over single-wire bus. IC Role / Device Role: Standalone TVS on LIN line and VCC rail, handling ISO 7637-2 Pulse 3b (+150 V) and ESD coupling. Use Value: Maintains <0.2 µA leakage at 25 °C, avoiding false wake-up or excessive quiescent current in sleep mode (<100 µA target). |
Use Scenario: Passive magnetic or Hall-effect wheel speed sensor output connected to ABS controller via long harnesses susceptible to inductive kickback. IC Role / Device Role: Bidirectional clamping (using two devices back-to-back) or unidirectional clamp on signal return path. Use Value: Withstands −220 V ISO 7637-2 Pulse 3a without degradation, preserving signal integrity and preventing comparator saturation in analog front-end. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6F6.0AY | Lower VRM (6.0 V) and VBR (6.7–7.4 V); identical package and power rating. | Better suited for 5 V logic-supplied modules where tighter voltage margin below 6.5 V is required. | Select when system nominal voltage is ≤5.5 V and clamping headroom must be minimized. |
| SMA6F7.0AY | Higher VRM (7.0 V) and VBR (7.7–8.4 V); same 600 W rating and thermal specs. | Preferred for 6.5–7.5 V auxiliary rails (e.g., infotainment USB-C PD negotiation lines) needing higher standoff. | Choose when protecting circuits with 7 V nominal supply to avoid false triggering during brown-out conditions. |
Compared with SMA6F6.0AY and SMA6F7.0AY, SMA6F6.5AY provides optimal balance between standoff margin and clamping headroom for 12 V automotive systems with 5 V or 6.5 V sub-circuits, reducing risk of premature conduction while maintaining robust surge suppression.
Availability
SMA6F6.5AY is available at Aetrix Electronics and suitable for automotive body electronics, powertrain communication interfaces, ADAS sensor nodes, and infotainment power management requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SMA6F6.5AY 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 broad IP portfolio.
SMA6FxxAY belongs to ST's Automotive Transil™ TVS family, engineered specifically for ISO 7637-2 and ISO 10605 compliance in harsh automotive environments-prioritizing reliability, low leakage, and thermal resilience over general-purpose surge suppression.
FAQ
What is the maximum clamping voltage for SMA6F6.5AY under ISO 7637-2 Pulse 1 conditions?
The clamping voltage is not directly specified for Pulse 1 in the datasheet, but based on its 10/1000 µs rating, SMA6F6.5AY limits voltage to ≤11.2 V at 56 A. For Pulse 1 (−150 V, 50 Ω source), actual clamped voltage depends on circuit impedance; typical measured values on recommended footprint fall within 10.5–11.5 V range at peak current.
Can SMA6F6.5AY be used in bidirectional configurations?
No-it is a unidirectional TVS diode. For bidirectional protection, two SMA6F6.5AY devices must be connected anode-to-anode (common-cathode) or cathode-to-cathode (common-anode), or a dedicated bidirectional part like SMA6F6.5A should be selected instead.
Does SMA6F6.5AY require derating at elevated ambient temperatures?
Yes. Peak pulse power decreases with junction temperature: at Tj = 125 °C, PPP drops to ~400 W (10/1000 µs); at 175 °C, it falls further. Derating curves in Figure 3 of DS12477 show linear reduction-designers must ensure thermal layout maintains Tj ≤150 °C for full 600 W capability.
Is the SMA Flat package compatible with standard reflow soldering profiles?
Yes. SMA6F6.5AY follows J-STD-020 MSL Level 1 and is qualified for ST's recommended reflow profile: peak temperature 240–245 °C, ramp rate ≤3 °C/s, time above 210 °C ≤60 s (max 90 s), with minimal convection to prevent component movement.
SMA6F6.5AY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-221AC, SMA Flat Leads
- Series:
- SMA6F
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 6.5V
- Voltage - Breakdown (Min):
- 7.2V
- Voltage - Clamping (Max) @ Ipp:
- 11.2V
- Current - Peak Pulse (10/1000µs):
- 56A
- 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:
- SMAflat
SMA6F6.5AY FAQ
1.How can I place an order for SMA6F6.5AY through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6F6.5AY 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 SMA6F6.5AY reliable?
The price and inventory of SMA6F6.5AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6F6.5AY is usually 5 days.
3.What payment methods are accepted for SMA6F6.5AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6F6.5AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6F6.5AY?
SMA6F6.5AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6F6.5AY 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 SMA6F6.5AY?
For technical support, including SMA6F6.5AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6F6.5AY requirements.
6.How does Aetrix verify that SMA6F6.5AY is sourced from the original manufacturer or authorized distributors?
All SMA6F6.5AY 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 SMA6F6.5AY meets industry standards.
7.What is the process for return or replacement of SMA6F6.5AY?
All SMA6F6.5AY units undergo pre-shipment inspection (PSI). If there is an issue with SMA6F6.5AY, 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 SMA6F6.5AY part is unused and in its original packaging.
Return procedure for SMA6F6.5AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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