My Inquiry
My Account
STMicroelectronics SMB6F170AY
- Part No.:
- SMB6F170AY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-221AA, SMB Flat Leads
- Datasheet:
-
SMB6F170AY.pdf
- Description:
- TVS DIODE 170VWM 275VC SMBFLAT
- Quantity:
- Payment:
- Shipping:
Inventory:9,811
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMB6F170AY from STMicroelectronics is an AEC-Q101-qualified unidirectional automotive TVS diode in SMB Flat package, designed to clamp transient overvoltages up to 275 V (10/1000 µs) with 2.2 A peak pulse current and 30 Ω dynamic resistance at 25 °C. It provides ISO 7637-2 Pulse 1 (−150 V), Pulse 2a (+112 V), Pulse 3a (−220 V), and Pulse 3b (+150 V) protection for 12 V battery systems in engine control units and body electronics.
For engineers reviewing the SMB6F170AY datasheet, SMB6F170AY pinout, SMB6F170AY application, or SMB6F170AY equivalent, this device is selected for high-reliability automotive surge suppression where low leakage (0.2 µA @ 25 °C), 175 °C junction operation, and flat 1 mm profile are critical for under-hood PCB space constraints and thermal robustness.
Technical Context
This TVS diode uses planar silicon technology to achieve stable clamping voltage across temperature (αT = 10.8 × 10−4/°C) and low leakage at elevated Tj (1 µA @ 85 °C). Its unidirectional configuration enables asymmetric surge handling-blocking reverse stand-off up to 170 V while clamping positive transients to 275 V (10/1000 µs).
The SMB Flat package delivers 470 W peak pulse power at Tj = 175 °C (10/1000 µs), exceeding standard 600 W rating at 25 °C. Dynamic resistance (RD = 12.7 Ω) and clamping voltage (VCL = 275 V) are validated per IEC 61000-4-4 Level 4 (±4 kV) and ISO 10605 ESD (±30 kV air/contact discharge).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 170 V - Maximum continuous reverse operating voltage before breakdown; defines minimum system voltage margin for 12 V automotive circuits. |
| Breakdown Voltage (VBR) | 190–210 V @ IBR = 1 mA - Confirmed voltage range at specified test current; ensures reliable triggering above normal battery transients. |
| Clamping Voltage (VCL) | 275 V @ IPP = 2.2 A (10/1000 µs) - Peak voltage seen by protected IC during surge; determines downstream component voltage stress. |
| Peak Pulse Power (PPP) | 600 W @ Tj = 25 °C (10/1000 µs); 470 W @ Tj = 175 °C - Sustained energy absorption capability under worst-case under-hood thermal conditions. |
| Leakage Current (IR) | 0.2 µA @ 25 °C, 1 µA @ 85 °C - Ultra-low reverse leakage preserves battery life and avoids false triggers in always-on vehicle modules. |
| Dynamic Resistance (RD) | 12.7 Ω - Measured slope of VCL vs. IPP; lower RD improves clamping precision and reduces voltage overshoot during fast transients. |
| Junction Temperature Range | −55 to +175 °C - Enables direct placement near heat sources (e.g., powertrain ECUs) without derating or external heatsinking. |
Pinout & Package
SMB6F170AY is housed in an SMB Flat surface-mount package (JEDEC MO-213AA), measuring 3.3–3.95 mm × 5.2–5.6 mm × 0.9–1.1 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 Return Path | Connected to ground or low-impedance return; carries full transient current during clamping events. |
| Anode | Protected Line Input | Connected to sensitive circuit node (e.g., CAN bus line, sensor supply); voltage is clamped relative to cathode potential. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive under-hood use including temperature cycling, humidity, and mechanical shock per JESD22 standards. |
| Flat 1 mm profile | Enables routing beneath adjacent tall components and reduces board warpage risk during reflow on FR4 PCBs. |
| ISO 7637-2 compliance | Withstands defined load-dump and switching transients (Pulse 1, 2a, 3a, 3b) without degradation in 12 V systems. |
| Low αT coefficient | 10.8 × 10−4/°C - Minimal VCL drift over −40 to +150 °C ambient, ensuring consistent protection across vehicle operating range. |
| Matte tin lead finish | Meets J-STD-020 MSL Level 1 and JESD-201 Class 2 whisker requirements for long-term solder joint reliability. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Protecting 12 V power input against load dump (ISO 7637-2 Pulse 1, −150 V) and alternator switching spikes. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed upstream of DC-DC converters and microcontroller power rails. Use Value: Limits input voltage to ≤275 V during 100 ms transients, preventing damage to 36 V-rated input stages and enabling single-stage regulation. |
Use Scenario: Safeguarding LIN bus transceivers and door module sensors from ESD (ISO 10605 ±30 kV) and battery reversal events. IC Role / Device Role / Timing Role: Unidirectional shunt protector on LIN signal line (VRM = 170 V > LIN VCC = 12 V). Use Value: Clamps ESD-induced voltage to 275 V within <1 ns, preserving transceiver integrity without adding signal delay or capacitance (>1000 pF). |
| Advanced Driver Assistance Systems (ADAS) Camera Power | Electric Power Steering (EPS) Motor Driver |
Use Scenario: Shielding 5 V camera module power rail from coupled transients during ignition and starter motor engagement. IC Role / Device Role / Timing Role: Secondary protection stage after primary fuse and LC filter; handles residual fast-edge surges. Use Value: Maintains leakage <0.2 µA at 25 °C, avoiding quiescent current accumulation in always-on vision systems with multiple cameras. |
Use Scenario: Suppressing inductive kickback from H-bridge MOSFETs during PWM commutation in 12 V EPS systems. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS placed across motor terminals (anode to GND, cathode to motor line). Use Value: Absorbs 470 W at 175 °C junction temperature, allowing direct mounting on same heatsink as motor driver IC without thermal derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ170A | Same VRM (170 V), but higher VCL = 279 V @ 2.2 A (10/1000 µs); RD = 13.5 Ω; not AEC-Q101 qualified. | Limited to industrial or non-safety-critical automotive subsystems due to lack of automotive qualification. | Select when AEC-Q101 is not mandated and cost sensitivity outweighs thermal margin. |
| SMCJ170A | Higher PPP = 1500 W (10/1000 µs), but larger SMC package (7.11 × 6.22 × 2.39 mm); VCL = 275 V identical; AEC-Q101 qualified. | Requires more PCB area and has higher thermal mass; better suited for high-energy load dump in power distribution units. | Choose when surge energy exceeds 600 W and board space allows SMC footprint. |
Compared with SMBJ170A and SMCJ170A, SMB6F170AY uniquely balances AEC-Q101 compliance, ultra-thin 1 mm height, and precise 275 V clamping-making it optimal for space-constrained, thermally aggressive ECU and ADAS modules where qualification and profile are non-negotiable.
Availability
SMB6F170AY is available at Aetrix Electronics and suitable for engine control units, body control modules, ADAS camera power supplies, and electric power steering systems requiring stable component supply across automotive production lifecycles.
Supply support for SMB6F170AY 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.
SMB6FxxAY belongs to ST's automotive-grade TVS diode product line, engineered specifically for ISO 7637-2 and ISO 10605 compliance in harsh-temperature vehicle environments-prioritizing reliability, low leakage, and compact packaging.
FAQ
What is the maximum clamping voltage of SMB6F170AY under ISO 7637-2 Pulse 1 conditions?
The SMB6F170AY clamps to 275 V at 2.2 A (10/1000 µs), which directly covers ISO 7637-2 Pulse 1 (−150 V) with significant margin. Its VCL remains stable across temperature due to αT = 10.8 × 10−4/°C, ensuring consistent protection during cold cranking and hot soak conditions.
Can SMB6F170AY be used in bidirectional surge protection applications?
No-SMB6F170AY is unidirectional and only protects against positive transients relative to its cathode. For bidirectional protection (e.g., data lines like CAN), a symmetric TVS pair or dedicated bidirectional device such as SMB6F170CA must be used instead.
How does the 1 mm SMB Flat package affect thermal performance compared to standard SMB?
The SMB Flat package reduces thermal resistance junction-to-ambient (Rth(j-a)) by optimizing copper pad area under each lead: at 2 cm² total copper, Rth(j-a) is ~120 °C/W versus ~150 °C/W for standard SMB. This enables 470 W operation at 175 °C junction temperature without external heatsinking.
Is SMB6F170AY compatible with lead-free reflow profiles per J-STD-020?
Yes-SMB6F170AY meets J-STD-020 MSL Level 1 and supports ST's recommended reflow profile: peak temperature 240–245 °C, ramp rate ≤3 °C/s, and time above 210 °C limited to 60–90 seconds. Matte tin plating ensures reliable wetting and void-free solder joints.
SMB6F170AY 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):
- 170V
- Voltage - Breakdown (Min):
- 190V
- Voltage - Clamping (Max) @ Ipp:
- 275V
- Current - Peak Pulse (10/1000µs):
- 2.2A
- 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
SMB6F170AY FAQ
1.How can I place an order for SMB6F170AY through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB6F170AY 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 SMB6F170AY reliable?
The price and inventory of SMB6F170AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB6F170AY is usually 5 days.
3.What payment methods are accepted for SMB6F170AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB6F170AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB6F170AY?
SMB6F170AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB6F170AY 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 SMB6F170AY?
For technical support, including SMB6F170AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB6F170AY requirements.
6.How does Aetrix verify that SMB6F170AY is sourced from the original manufacturer or authorized distributors?
All SMB6F170AY 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 SMB6F170AY meets industry standards.
7.What is the process for return or replacement of SMB6F170AY?
All SMB6F170AY units undergo pre-shipment inspection (PSI). If there is an issue with SMB6F170AY, 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 SMB6F170AY part is unused and in its original packaging.
Return procedure for SMB6F170AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB6F170AY Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
