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Texas Instruments SN75240P
- Part No.:
- SN75240P
- Manufacturer:
- Texas Instruments
- Category:
- Mixed Technology
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
SN75240P.pdf
- Description:
- TVS DEVICE MIXED 7V 8-PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,144
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Product details
Overview
SN75240P from Texas Instruments is a quadruple unidirectional transient voltage suppressor (TVS) designed for ESD protection of USB full-speed and low-speed ports. It features 6.5-V minimum breakdown voltage, 35-pF typical input capacitance, ≤1-µA leakage at 6 V, 15-kV HBM ESD rating, and operates from 0°C to 70°C in an 8-pin PDIP package.
For engineers reviewing the SN75240P datasheet, SN75240P pinout, SN75240P application, or SN75240P equivalent, this page delivers verified electrical parameters, validated pin functions, USB-specific protection context, thermal metrics, and real-world layout guidance for robust I/O port hardening.
Technical Context
The SN75240P integrates four independent unidirectional TVS diodes in a single monolithic IC, each configured as a Zener-clamped bipolar transistor structure with forward diode clamping for negative transients. Its functional mode switches between high-impedance standby (VI < 6.5 V) and low-impedance shunt conduction (VI ≥ VBR) during ESD events.
It is optimized for USB 1.1 signaling (≤12 Mbps), where 35-pF junction capacitance avoids signal integrity degradation while maintaining sufficient clamping speed. The device requires no external power supply and relies solely on local ground return paths for transient energy dissipation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage (VBR) | 6.5 V min at 1 mA - ensures clamping begins above USB 5-V VBUS and transceiver logic rails without false triggering |
| Input Capacitance (CIN) | 35 pF typical - compatible with USB full-speed (12 Mbps) but unsuitable for USB 2.0 high-speed (480 Mbps) |
| Leakage Current (ILKG) | 1 µA max at 6 V - prevents loading of USB data lines during normal operation |
| ESD Rating (HBM) | ±15 kV - exceeds IEC 61000-4-2 Level 4 system-level requirements for USB ports |
| Ambient Temp Range | 0°C to 70°C - qualified for commercial-grade USB host/peripheral applications, not extended industrial or automotive |
| Peak Power Dissipation | 60 W - supports short-duration ESD pulses without thermal failure under proper PCB layout |
Pinout & Package
SN75240P uses an 8-pin plastic dual in-line package (PDIP-P), body size 9.09 mm × 6.35 mm, with two dedicated ground pins (pins 1 and 3) and four analog inputs (A, B, C, D) for bidirectional USB data line protection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A | Analog input | Transient suppressor input for USB D+ line - connects directly to upstream D+ trace near connector |
| B | Analog input | Transient suppressor input for USB D− line - paired with A to protect differential data pair |
| C | Analog input | Transient suppressor input for third I/O line - usable for VBUS or auxiliary signal protection if needed |
| D | Analog input | Transient suppressor input for fourth I/O line - enables multi-line protection beyond standard USB D+/D− |
| GND (pins 1, 3) | Power | Local device ground - both pins must connect to solid ground plane to minimize L(di/dt) during ESD discharge |
Key Features
| Feature | Design Value |
|---|---|
| Quadruple unidirectional TVS | Four independent clamping paths enable simultaneous protection of D+, D−, VBUS, and auxiliary lines without cross-talk |
| Low 35-pF capacitance | Preserves USB 1.1 signal rise/fall times and eye diagram integrity without requiring equalization or retiming |
| 15-kV HBM ESD rating | Meets or exceeds IEC 61000-4-2 Level 4 for system-level USB port immunity in consumer and office environments |
| 6.5-V minimum breakdown | Provides margin above 5.5-V USB transceiver supply while avoiding conduction during normal 5-V operation |
| Zero-power operation | No bias supply required - activates only during overvoltage events, eliminating quiescent current and design complexity |
Applications
| USB Full-Speed Host Port | USB Low-Speed Peripheral |
|---|---|
|
Use Scenario: Desktop PC motherboard USB Type-A ports exposed to frequent hot-plug insertion and human-hand ESD. IC Role / Device Role / Timing Role: Quadruple TVS clamps transients on D+, D−, VBUS, and GND-return path before they reach the USB controller ASIC. Use Value: Prevents latch-up or gate oxide damage in 3-V/5-V CMOS transceivers during ±15-kV contact discharges per IEC 61000-4-2. |
Use Scenario: Keyboard/mouse microcontroller with integrated USB 1.1 PHY connected via short cable to host. IC Role / Device Role / Timing Role: Unidirectional suppression on D+ and D− lines only, leveraging SN75240P's low capacitance to maintain 1.5-Mbps timing margins. Use Value: Enables reliable operation in uncontrolled ESD environments without degrading low-speed USB setup/hold timing. |
| Industrial USB Hub | Embedded USB Device Interface |
|
Use Scenario: Factory-floor USB hub with multiple downstream ports subject to repeated cable mating cycles and static buildup. IC Role / Device Role / Timing Role: Protects upstream D+/D− lines and downstream VBUS distribution using all four channels in parallel configuration. Use Value: Extends mean time between failures (MTBF) by suppressing repetitive 2–4-kV machine-model transients induced by relay switching or motor drives. |
Use Scenario: Medical sensor module with USB interface mounted inside metal enclosure, requiring minimal board space and no external bias. IC Role / Device Role / Timing Role: Standalone TVS placed adjacent to USB micro-B connector, using pins A/B for data and C/D for shield/VBUS guard traces. Use Value: Achieves Class B EMC compliance with compact PDIP footprint and zero additional BOM components or routing layers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN65240P | Identical pinout and electrical specs, but rated for –40°C to 85°C operating range | Supports extended temperature industrial or outdoor USB deployments where SN75240P's 0°C–70°C range is insufficient | Select SN65240P when ambient temperature may fall below 0°C or exceed 70°C during operation |
| TPD2E001DRSR | 2-channel, 12-pF capacitance, DSBGA-6 package, 5.5-V standoff, ±8-kV HBM | Targeted for space-constrained portable USB ports; lower capacitance enables marginal USB 2.0 compatibility | Choose TPD2E001DRSR only for handheld devices needing ultra-low capacitance and sub-2-mm² footprint - not a drop-in replacement |
Compared with SN75240P, SN65240P offers broader temperature capability without layout changes, while TPD2E001DRSR trades channel count and ruggedness for size and speed - making SN75240P optimal for cost-sensitive, commercial-grade USB host protection where PDIP assembly is acceptable.
Availability
SN75240P is available at Aetrix Electronics and suitable for USB host controllers, peripheral interface modules, and industrial hub designs requiring stable component supply across commercial temperature grades and long-lifecycle production runs.
Supply support for SN75240P 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
Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in interface, protection, and signal chain solutions.
The SN75240P belongs to TI's USB transient suppressor family, engineered specifically to harden legacy and cost-optimized USB 1.1 interfaces against electrostatic discharge in commercial computing and peripheral equipment.
FAQ
What is the maximum data rate supported by SN75240P?
The SN75240P supports USB full-speed (12 Mbps) and low-speed (1.5 Mbps) signaling only. Its 35-pF typical input capacitance introduces excessive signal distortion at USB 2.0 high-speed rates (480 Mbps), so it must not be used in high-speed USB applications. Designers should verify eye diagram compliance per USB-IF specifications when integrating SN75240P into new layouts.
Does SN75240P require an external power supply?
No, SN75240P does not require any external power supply. It is a passive transient suppressor composed of integrated p-n junction structures that activate only during overvoltage events. The device draws zero quiescent current during normal operation and relies entirely on local ground connections for transient energy dissipation.
Can SN75240P be used for USB 2.0 high-speed protection?
No, SN75240P is not suitable for USB 2.0 high-speed (480 Mbps) protection due to its 35-pF typical input capacitance, which degrades signal integrity beyond acceptable limits. The datasheet explicitly states it is intended for USB low- and full-speed ports only. For high-speed applications, consider lower-capacitance alternatives like TPD2E001 or USB-IF-compliant high-speed TVS arrays.
What is the significance of dual GND pins (pins 1 and 3) on SN75240P?
The dual GND pins (1 and 3) on SN75240P reduce overall ground path inductance and resistance, enabling faster transient current diversion during ESD events. Both pins must be connected directly to a solid ground plane using short, wide traces or multiple vias - splitting the return path improves clamping response time and prevents localized heating during multi-kA surge currents.
How does SN75240P differ from SN65240P in terms of temperature rating?
SN75240P is rated for 0°C to 70°C ambient operation, while SN65240P extends to –40°C to 85°C. This makes SN65240P suitable for industrial or outdoor USB applications where temperature extremes occur, whereas SN75240P targets commercial-grade desktop, peripheral, and consumer electronics where ambient conditions remain within room-temperature ranges.
SN75240P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Voltage - Clamping:
- 7V
- Technology:
- Mixed Technology
- Number of Circuits:
- 1
- Applications:
- USB
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
SN75240P FAQ
1.How can I place an order for SN75240P through Aetrix?
Please submit a Request for Quotation (RFQ) for SN75240P 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 SN75240P reliable?
The price and inventory of SN75240P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN75240P is usually 5 days.
3.What payment methods are accepted for SN75240P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN75240P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN75240P?
SN75240P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN75240P 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 SN75240P?
For technical support, including SN75240P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN75240P requirements.
6.How does Aetrix verify that SN75240P is sourced from the original manufacturer or authorized distributors?
All SN75240P 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 SN75240P meets industry standards.
7.What is the process for return or replacement of SN75240P?
All SN75240P units undergo pre-shipment inspection (PSI). If there is an issue with SN75240P, 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 SN75240P part is unused and in its original packaging.
Return procedure for SN75240P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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