My Inquiry
My Account
STMicroelectronics SMB6F70A
- Part No.:
- SMB6F70A
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-221AA, SMB Flat Leads
- Datasheet:
-
SMB6F70A.pdf
- Description:
- TVS DIODE 70VWM 113VC SMBFLAT
- Quantity:
- Payment:
- Shipping:
Inventory:9,838
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMB6F70A from STMicroelectronics is a unidirectional 600 W transient voltage suppression (TVS) diode in SMB Flat package, designed to protect sensitive electronics against ESD and surge events. It features a stand-off voltage of 70 V, clamping voltage of 113 V at 5.5 A (10/1000 µs), and operates up to 175 °C junction temperature-ideal for automotive power line and industrial I/O interface protection.
For engineers reviewing the SMB6F70A datasheet, SMB6F70A pinout, SMB6F70A application, or SMB6F70A equivalent, key selection criteria include clamping performance under 8/20 µs surges, low leakage (<0.2 µA at 25 °C), thermal robustness at Tj = 175 °C, and compliance with IEC 61000-4-2 level 4 (±30 kV contact/air discharge).
Technical Context
This TVS diode uses planar silicon technology to achieve low dynamic resistance (2.22 Ω at 10/1000 µs) and stable breakdown behavior across temperature. Its unidirectional configuration enables integration into DC-biased lines without reverse conduction during normal operation.
The device meets stringent reliability standards including J-STD-020 MSL Level 1, JEDEC registered SMB Flat outline, and IPC7531 footprint compatibility. It delivers 470 W peak pulse power at Tj = 175 °C-critical for high-temperature automotive and industrial environments where thermal derating must be minimized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 70 V - Maximum continuous reverse operating voltage before clamping begins |
| Breakdown Voltage (VBR) | 77.9–86.1 V at 1 mA - Ensures reliable triggering above nominal rail while avoiding false trips |
| Clamping Voltage (VCL) | 113 V at 5.5 A (10/1000 µs) - Limits downstream voltage stress during surge transients |
| Peak Pulse Power (PPP) | 600 W (10/1000 µs), 146 W (8/20 µs) - Supports IEC 61000-4-4 level 4 (±4 kV) surge immunity |
| Leakage Current (IRM) | 0.2 µA at 25 °C, 1 µA at 85 °C - Minimizes standby power loss in battery-powered systems |
| Junction Temperature Range | −55 to +175 °C - Enables deployment in under-hood automotive and industrial control cabinets |
| Dynamic Resistance (RD) | 2.22 Ω - Low impedance limits voltage overshoot during fast-rising transients |
Pinout & Package
The SMB6F70A is housed in an SMB Flat package (JEDEC MO-213AA), measuring 3.3–3.95 mm × 5.2–5.6 mm × 1.0 mm max height, with matte tin-plated leads compliant with JESD 22-B102 E3 and MIL-STD-750 method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked side) | Surge current sink | Connected to protected line; conducts during overvoltage to clamp energy to ground |
| Anode | Reference / return path | Typically tied to system ground or lowest potential node in unidirectional configuration |
Key Features
| Feature | Design Value |
|---|---|
| High-temperature operation | Rated for continuous use up to Tj = 175 °C-reduces need for thermal derating in compact enclosures |
| Low-leakage planar junction | 0.2 µA IR at 25 °C ensures minimal loading on high-impedance sensor inputs or battery rails |
| Flat, low-profile package | 1.0 mm max height enables routing under connectors and in space-constrained PCB layouts |
| IEC 61000-4-2 level 4 compliance | Withstands ±30 kV air/contact discharge-meets automotive EMC requirements without external shielding |
Applications
| Automotive Power Line Protection | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V supply rails in engine control units (ECUs) and body control modules against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to shunt surge energy away from LDOs and microcontrollers. Use Value: Clamps to 113 V within nanoseconds, preventing damage to 36 V-rated regulators and ensuring ASIL-B functional safety compliance. | Use Scenario: Shielding PLC digital input channels from field-induced surges in factory automation systems. IC Role / Device Role / Timing Role: Standoff protection element on 24 V dry-contact inputs, absorbing repetitive 1 kV/500 A transients per IEC 61000-4-4. Use Value: Maintains <0.2 µA leakage at ambient temperature-preserving signal integrity and reducing false triggering in high-impedance sensing circuits. |
| Telecom Interface Protection | Consumer USB Port ESD Guard |
Use Scenario: Safeguarding RS-485 transceivers in outdoor base station backhaul links exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary front-end TVS on differential bus lines, coordinated with secondary GDT or polymer PTC for multi-stage protection. Use Value: Delivers 146 W (8/20 µs) surge handling-enabling single-device compliance with Telcordia GR-1089-CORE level 3 requirements. | Use Scenario: ESD protection for USB 2.0 VBUS and D+/D− lines in portable medical devices requiring IEC 60601-1-2 compliance. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed directly at connector, minimizing trace inductance before IC pins. Use Value: Achieves ±30 kV contact discharge immunity per IEC 61000-4-2-exceeding Class 4 requirements without additional capacitance degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ70A | Same SMB package, but rated for 600 W (10/1000 µs); VBR = 77.8–86 V, VCL = 113 V at 5.5 A-nearly identical electrical specs | Identical pinout and footprint; differs only in manufacturing process (planar vs. epitaxial) and minor leakage variation | Select SMBJ70A if legacy design validation already covers SMBJ series; otherwise SMB6F70A offers improved high-temp stability. |
| 1.5SMC70A | Higher-power SMC package (1500 W), larger footprint (7.11 × 6.22 mm), VCL = 113 V at 13.3 A-same clamping but higher surge capacity | Requires PCB layout change; suited for primary-level AC/DC input protection rather than board-level signal line clamping | Choose 1.5SMC70A only when >600 W surge margin is required and board space permits larger package. |
Compared with SMBJ70A, SMB6F70A provides superior thermal stability at 175 °C and lower leakage at elevated temperatures; versus 1.5SMC70A, it trades surge headroom for compactness and faster response in space-constrained signal paths.
Availability
SMB6F70A is available at Aetrix Electronics and suitable for automotive power line protection, industrial digital I/O hardening, telecom interface safeguarding, and consumer USB port ESD guard requiring stable component supply across production lifecycles.
Supply support for SMB6F70A 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, delivering innovative solutions across automotive, industrial, and power management markets.
The SMB6FxxA series belongs to ST's high-reliability TVS portfolio, engineered specifically for harsh-environment surge protection where low leakage, flat packaging, and extended temperature operation are mandatory.
FAQ
What is the maximum clamping voltage of SMB6F70A under an 8/20 µs surge?
The SMB6F70A clamps to 146 V at 27 A under an 8/20 µs surge waveform, as specified in Table 2 of DS12898 Rev 2. This value reflects worst-case VCL at rated IPP, ensuring predictable voltage limiting during fast-rising transients like lightning-induced surges.
Does SMB6F70A require derating at elevated ambient temperatures?
Yes-its peak pulse power decreases with rising junction temperature. At Tj = 125 °C, PPP drops to ~470 W (10/1000 µs); at 175 °C, it remains rated for 470 W due to its high-Tj design. Derating curves are shown in Figure 3 of the datasheet, and thermal design must account for Rth(j-a) ≈ 120 °C/W on standard FR4.
Can SMB6F70A be used in bidirectional configurations?
No-SMB6F70A is unidirectional only. Its cathode-anode polarity is fixed; reverse connection would cause forward conduction during normal operation. For bidirectional protection, ST offers the SMB6F70CA variant (center-tapped, symmetrical clamping), which is electrically distinct and not interchangeable.
Is SMB6F70A compatible with lead-free reflow soldering processes?
Yes-it is qualified for lead-free reflow per J-STD-020 MSL Level 1, with a peak profile of 240–245 °C for ≤60 seconds. The matte tin plating meets JESD 22-B102 E3 and MIL-STD-750 method 2026, ensuring reliable wetting and intermetallic formation without whisker risk.
SMB6F70A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-221AA, SMB Flat Leads
- Series:
- SMB6FxxA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 70V
- Voltage - Breakdown (Min):
- 77.9V
- Voltage - Clamping (Max) @ Ipp:
- 113V
- Current - Peak Pulse (10/1000µs):
- 5.5A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMBflat
SMB6F70A FAQ
1.How can I place an order for SMB6F70A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB6F70A 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 SMB6F70A reliable?
The price and inventory of SMB6F70A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB6F70A is usually 5 days.
3.What payment methods are accepted for SMB6F70A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB6F70A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB6F70A?
SMB6F70A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB6F70A 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 SMB6F70A?
For technical support, including SMB6F70A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB6F70A requirements.
6.How does Aetrix verify that SMB6F70A is sourced from the original manufacturer or authorized distributors?
All SMB6F70A 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 SMB6F70A meets industry standards.
7.What is the process for return or replacement of SMB6F70A?
All SMB6F70A units undergo pre-shipment inspection (PSI). If there is an issue with SMB6F70A, 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 SMB6F70A part is unused and in its original packaging.
Return procedure for SMB6F70A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB6F70A 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…
