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onsemi 74F1071SCX
- Part No.:
- 74F1071SCX
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74F1071SCX.pdf
- Description:
- TVS DIODE 5VWM 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:6,203
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Product details
Overview
74F1071SCX from Fairchild Semiconductor is an 18-bit undershoot/overshoot clamp and ESD protection device in a 20-lead SOIC package, featuring FAST® bipolar clamping action with ±10 kV HBM ESD rating, 0.5 V undershoot and 7.0 V overshoot clamping thresholds, and 13 pF input capacitance at 5 V bias - deployed to safeguard 5 V CMOS/TTL bus interfaces against transient overstress.
For engineers reviewing the 74F1071SCX datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage accuracy (±0.5 V undershoot / ±0.5 V overshoot tolerance), dual-center-ground layout for low-inductance ESD current path, and compatibility with JEDEC MS-013 SOIC footprint for legacy 5 V system I/O protection.
Technical Context
The 74F1071SCX implements discrete bipolar clamp diodes per channel in an 18-bit array, with two dedicated ground pins (pins 10 and 11) enabling symmetric, low-inductance return paths for both positive and negative ESD transients. Its clamping behavior is defined by forward conduction at –0.9 V (–200 mA) and reverse breakdown at 7.7 V (max, TA = 0°C to +70°C).
It operates within 0°C to +70°C ambient, supports 5.25 V DC reverse bias, and delivers <3% adjacent-input crosstalk - confirming its suitability for high-density parallel bus protection where signal integrity and channel isolation are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Clamping Threshold (Undershoot) | Nominally –0.5 V; limits negative excursions to prevent CMOS gate oxide stress below GND |
| Clamping Threshold (Overshoot) | Nominally +7.0 V; holds positive transients below TTL/CMOS absolute max input voltage |
| ESD Rating (HBM) | ±10 kV - meets MIL-STD-883D method 3015.7 for robust handling in manufacturing and field environments |
| Input Capacitance | 13 pF @ 5 V bias - minimizes signal rise-time degradation on 5 V data buses up to ~100 MHz |
| Package | 20-lead SOIC (JEDEC MS-013, 0.300" wide, M20B) - compatible with standard surface-mount assembly and reflow profiles |
| Thermal Resistance θJA | 100°C/W - enables operation at full rated power (800 mW) in +70°C free-air ambient |
Pinout & Package
74F1071SCX uses a 20-lead Small Outline Integrated Circuit (SOIC) package per JEDEC MS-013, 0.300" wide (M20B), with pin 1 indicator and dual center ground terminals (pins 10 and 11) optimized for low-inductance ESD current routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–9, 12–19 | Input/Output Clamp Channels | 18 bidirectional clamp channels (pins 1–9 and 12–19); each provides independent undershoot/overshoot protection |
| 10, 11 | Ground (GND) | Dual center-ground pins reduce loop inductance for symmetrical ESD current return during ± transient events |
| 20 | VCC (Tie to 5 V) | Not powered; used as reference tie point for internal clamp structure - must be connected to system VCC (5 V) |
Key Features
| Feature | Design Value |
|---|---|
| FAST® Bipolar Clamping | Sub-nanosecond response with precise –0.5 V / +7.0 V thresholds ensures immediate transient suppression without latch-up risk |
| Dual Center Ground Pins | Pins 10 and 11 placed symmetrically minimize ground bounce and improve ESD current distribution across all 18 channels |
| Low Input Capacitance | 13 pF at 5 V bias preserves signal edge integrity on high-speed 5 V parallel buses (e.g., ISA, LPC, legacy memory interfaces) |
| Robust ESD Architecture | ±10 kV HBM, ±6 kV IEC 801-2, and ±2 kV machine model ratings validated per JEDEC standards for production reliability |
Applications
| Industrial Control Backplane | Legacy PC Expansion Interface |
|---|---|
Use Scenario: Protecting FPGA I/O banks connected to multi-drop RS-485 or CAN transceivers on factory-floor backplanes subject to cable discharge events. IC Role / Device Role / Timing Role: Undershoot/overshoot clamp at physical layer interface, operating transparently in-line with signal paths without timing delay. Use Value: Prevents cumulative gate oxide damage from repeated ±1 kV contact discharges while maintaining <13 pF loading on 10 Mbps differential lines. |
Use Scenario: Safeguarding ISA bus data/address lines on industrial motherboards exposed to operator-handling ESD during hot-swap peripheral insertion. IC Role / Device Role / Timing Role: Parallel-port ESD suppressor placed directly at edge connector, clamping transients before they reach chipset buffers. Use Value: Enables compliance with IEC 61000-4-2 Level 4 (±8 kV contact) using single-device coverage for all 18 data/address lines. |
| Automotive Diagnostic Port (OBD-II) | Test Equipment Front-End Interface |
Use Scenario: Securing K-Line and L-Line signals in OBD-II diagnostic connectors against ignition noise and service-tool ESD. IC Role / Device Role / Timing Role: Bidirectional transient voltage suppressor with rail-to-rail clamping, supporting 10.4 kbps K-Line signaling without distortion. Use Value: Maintains signal fidelity under –0.5 V to +7.0 V clamping window while surviving >10,000 contact discharge cycles per pin. |
Use Scenario: Protecting GPIB or parallel port inputs of automated test equipment from accidental probe discharge during lab use. IC Role / Device Role / Timing Role: Passive clamp array placed at PCB edge connector, providing fail-safe protection without active control or power sequencing. Use Value: Eliminates need for discrete diode arrays or TVS discretes - reduces BOM count and layout area by 70% for 18-line interfaces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC1T45DBVR | Single-channel level translator with integrated ESD protection (±8 kV HBM); no undershoot clamping below –0.5 V | Limited to point-to-point logic translation; lacks 18-channel parallel architecture and dual-GND layout | Use only for isolated signal-level shifting where bus-wide protection is unnecessary |
| TPD2E001DRSR | 2-channel ESD protector with 10 pF capacitance and ±8 kV HBM; no dedicated undershoot clamp or 5 V CMOS-optimized threshold | Designed for USB/low-speed serial; not rated for 18-bit parallel bus voltage clamping or 5 V rail alignment | Select when protecting differential pairs or low-pin-count interfaces - not suitable for 74F1071SCX's 18-bit bus role |
Compared with SN74LVC1T45DBVR and TPD2E001DRSR, the 74F1071SCX uniquely delivers simultaneous 18-channel undershoot/overshoot clamping with dual-ground symmetry and 5 V CMOS-specific thresholds - making it irreplaceable for legacy parallel bus ESD hardening where channel density, clamping precision, and layout inductance are design-critical.
Availability
74F1071SCX is available at Aetrix Electronics and suitable for industrial control backplanes, legacy PC expansion interfaces, and automotive OBD-II diagnostic ports requiring stable component supply and long-lifecycle support for mature 5 V systems.
Supply support for 74F1071SCX 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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in analog, power, and interface ICs before its acquisition by ON Semiconductor in 2016; known for FAST®, FACT®, and PowerTrench® technologies.
The 74F1071SCX belongs to Fairchild's legacy FAST® bipolar protection family, engineered specifically for robust, low-capacitance ESD hardening of 5 V CMOS/TTL parallel buses in industrial and computing infrastructure.
FAQ
What is the primary circuit role of the 74F1071SCX?
The 74F1071SCX serves as an 18-bit bidirectional undershoot/overshoot clamp, positioned inline on 5 V parallel bus traces to limit voltage excursions to –0.5 V and +7.0 V while diverting ESD current safely to ground. It functions passively without power or control signals, and its dual-center-ground pins ensure low-inductance transient dissipation - a critical requirement for reliable protection in legacy industrial and computing interfaces.
Does the 74F1071SCX require external power or biasing?
No, the 74F1071SCX operates entirely passively and requires no external power supply. Pin 20 (VCC) must be tied to the system's 5 V rail to establish the clamping reference for the internal bipolar structures, but the device draws zero quiescent current. All 18 channels function autonomously based on input voltage excursion relative to GND and VCC, making the 74F1071SCX ideal for always-on, low-maintenance protection schemes.
Can the 74F1071SCX be used in modern 3.3 V systems?
The 74F1071SCX is specified and optimized for 5 V CMOS/TTL systems, with clamping thresholds centered at –0.5 V and +7.0 V - exceeding the absolute maximum rating of most 3.3 V devices. Using it on 3.3 V buses risks overstressing downstream components during overshoot events. For 3.3 V applications, purpose-built protectors like the NUP4105MR6T1G (with 3.6 V VBR) are recommended instead of the 74F1071SCX.
How does the dual-ground configuration of the 74F1071SCX improve ESD performance?
The dual-center-ground pins (10 and 11) in the 74F1071SCX create symmetrical, low-inductance return paths for both positive and negative ESD transients - reducing ground bounce and ensuring uniform clamping response across all 18 channels. This layout minimizes voltage overshoot at the protected node during fast-rising events (e.g., IEC 61000-4-2 0.7–1 ns rise time), a key advantage over single-ground clamp arrays where inductance skews channel-to-channel clamping consistency.
Is the 74F1071SCX compliant with lead-free assembly standards?
Yes, the 74F1071SCX is lead-free and complies with JEDEC J-STD-020B reflow profile requirements. Its SOIC package (M20B) is qualified for standard Pb-free soldering processes, including peak temperatures up to 260°C. The device also meets RoHS Directive 2011/65/EU and is marked with appropriate packaging identifiers - confirming full compatibility with modern lead-free manufacturing for the 74F1071SCX.
74F1071SCX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 18
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 5V
- Voltage - Breakdown (Min):
- -
- Voltage - Clamping (Max) @ Ipp:
- -
- Current - Peak Pulse (10/1000µs):
- -
- Power - Peak Pulse:
- 800mW
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
74F1071SCX FAQ
1.How can I place an order for 74F1071SCX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74F1071SCX 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 74F1071SCX reliable?
The price and inventory of 74F1071SCX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74F1071SCX is usually 5 days.
3.What payment methods are accepted for 74F1071SCX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74F1071SCX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74F1071SCX?
74F1071SCX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74F1071SCX 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 74F1071SCX?
For technical support, including 74F1071SCX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74F1071SCX requirements.
6.How does Aetrix verify that 74F1071SCX is sourced from the original manufacturer or authorized distributors?
All 74F1071SCX 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 74F1071SCX meets industry standards.
7.What is the process for return or replacement of 74F1071SCX?
All 74F1071SCX units undergo pre-shipment inspection (PSI). If there is an issue with 74F1071SCX, 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 74F1071SCX part is unused and in its original packaging.
Return procedure for 74F1071SCX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74F1071SCX Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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ESD5Z3.3T1G
onsemi
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D5V0H1B2LP-7B
Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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