My Inquiry
My Account
Diodes Incorporated QSBT40-7-F
- Part No.:
- QSBT40-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
QSBT40-7-F.pdf
- Description:
- TVS DIODE 30VWM SOT363
- Quantity:
- Payment:
- Shipping:
Inventory:34,017
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
QSBT40-7-F from Diodes Incorporated is a quad Schottky bus terminator diode array in SOT363 package, designed for high-speed data line transient protection and DC termination. It features 30 V reverse voltage rating, 200 mA continuous forward current per diode, 5 ns reverse recovery time, and IEC61000-4-2 ESD protection up to 15 kV (air), used in USB 2.0, LVDS, and parallel bus interfaces.
For engineers reviewing the QSBT40-7-F datasheet, QSBT40-7-F pinout, QSBT40-7-F application, or QSBT40-7-F equivalent, this device delivers verified low-capacitance (6.5–10.0 pF) clamping with sub-450 mV forward voltage at 10 mA, enabling signal integrity preservation in 100+ Mbps digital buses while meeting industrial-grade EFT and lightning surge immunity requirements.
Technical Context
The QSBT40-7-F integrates four independent Schottky diodes in a single SOT363 package, each configured as a cathode-to-data-line/anode-to-VCC or GND clamp. Its PN junction guard ring structure provides robust ESD/Transient immunity without sacrificing switching speed.
Designed for bidirectional data line protection, it supports both pull-up (VCC→DLx) and pull-down (DLx→GND) termination paths. The 5 ns trr and ≤10.0 pF inter-line capacitance ensure minimal signal distortion on high-frequency buses operating up to 200 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 30 V - Maximum reverse blocking voltage per diode; defines safe operating margin against bus overshoot in 3.3 V systems. |
| IFM | 200 mA - Continuous forward current rating per diode; supports sustained DC bias current in active termination networks. |
| VF @ 10 mA | ≤450 mV - Low forward drop ensures minimal voltage offset in logic-level translation and biasing circuits. |
| trr | 5.0 ns - Fast recovery enables clean switching in >100 Mbps serial links without tail current distortion. |
| CT (DL–VCC/GND) | 10.0 pF - Capacitance between data line and supply/ground; critical for maintaining impedance continuity on 50 Ω traces. |
| CT (DL–DL) | 6.5 pF - Inter-channel capacitance; limits crosstalk in tightly spaced multi-line buses like DDR address/control groups. |
| ESD Rating | ±15 kV air / ±8 kV contact - Meets IEC61000-4-2 Level 4; eliminates need for external TVS in Class B industrial interfaces. |
Pinout & Package
SOT363 (SC-88) 6-pin ultra-small surface-mount package: 1.0 mm × 2.1 mm footprint, 0.95 mm height, matte tin-plated Alloy 42 leadframe, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DL2) | Data Line 2 Cathode | Clamps DL2 to VCC when overvoltage occurs; connects to protected signal trace. |
| 2 (DL1) | Data Line 1 Cathode | Clamps DL1 to VCC; independent path for differential pair or separate bus line. |
| 3 (GND) | Ground Reference | Common return for all internal cathode connections; must be low-inductance connection to system ground plane. |
| 4 (VCC) | Supply Rail Anode | Connects to 3.3 V or 5 V termination voltage; supplies clamping current during transients. |
| 5 (DL3) | Data Line 3 Cathode | Third independent clamping path; supports three-wire buses or redundant signal lines. |
| 6 (DL4) | Data Line 4 Cathode | Fourth clamping path; enables full termination of 4-bit parallel buses or dual differential pairs. |
Key Features
| Feature | Design Value |
|---|---|
| Quad Schottky Diode Array | Four independent, matched diodes in one SOT363 package-reduces PCB area by 75% vs. discrete 0603 diodes. |
| Guard Ring Protection | Integrated PN junction guard ring suppresses latch-up and improves ESD robustness beyond standard Schottky structures. |
| Low Inter-Line Capacitance | 6.5 pF between DL pins minimizes crosstalk in high-density routing of USB or MIPI D-PHY lanes. |
| Ultra-Low VF at 10 mA | ≤450 mV forward drop preserves noise margin in 3.3 V LVTTL/LVCMOS interfaces with tight VIH/VIL specs. |
| IEC61000-4-4 Compliance | Withstands 80 A EFT bursts (5/50 ns), eliminating need for secondary filtering in factory automation I/O modules. |
Applications
| USB 2.0 Data Lines | LVDS Bus Termination |
|---|---|
Use Scenario: Protecting D+ and D− lines in embedded host controllers against ESD events during hot-plug insertion. IC Role / Device Role / Timing Role: Bidirectional clamping diode array providing DC termination and transient suppression simultaneously. Use Value: Maintains signal integrity below 480 Mbps with <10 ps jitter contribution due to 6.5 pF inter-line capacitance and 5 ns trr. | Use Scenario: Terminating 100 Ω differential pairs in industrial camera sensor interfaces with stable DC bias. IC Role / Device Role / Timing Role: Dual-path Schottky clamp supplying precise 1.2 V common-mode bias while shunting ESD. Use Value: Enables reliable 600 Mbps LVDS operation with <0.5% duty-cycle distortion from matched VF across DL1/DL2 paths. |
| Parallel Address Bus | Industrial CAN Transceiver Interface |
Use Scenario: DC termination and ESD protection for 8-bit microcontroller address lines in programmable logic controllers. IC Role / Device Role / Timing Role: Four-diode array providing individual clamping for A0–A3 with shared VCC/GND rails. Use Value: Reduces board space by 4× versus discrete solutions while maintaining <2 ns skew between terminated lines. | Use Scenario: Protecting CAN_H/CAN_L input pins of isolated transceivers in motor drive control units. IC Role / Device Role / Timing Role: Secondary clamping stage after primary TVS, absorbing residual energy from IEC61000-4-5 Class 3 surges. Use Value: Extends system-level surge withstand to 1 kV (1.2/50 μs) without degrading CAN bit timing due to low trr. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad Schottky bus termination applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DMN3026LSD-13 | Single N-channel MOSFET in SOT23; no integrated clamping diodes or ESD guard ring. | Requires external diodes for bus termination; unsuitable for direct replacement in ESD-critical designs. | Select only if designing custom active termination with gate-controlled bias and external TVS. |
| TPD4E004DRYR | Quad ESD array with 0.5 pF capacitance but no DC termination capability; lacks VCC/GND pins for biasing. | Provides only transient suppression-cannot replace QSBT40-7-F in DC-coupled termination schemes. | Choose when signal integrity demands ultra-low capacitance but DC bias is handled elsewhere (e.g., series resistors). |
Compared with DMN3026LSD-13 and TPD4E004DRYR, QSBT40-7-F uniquely combines DC termination, low-VF Schottky clamping, and IEC-compliant ESD protection in one package-enabling simplified layout and guaranteed performance in 3.3 V bus interfaces where both bias stability and surge immunity are required.
Availability
QSBT40-7-F is available at Aetrix Electronics and suitable for USB 2.0 interface design, industrial LVDS camera links, and microcontroller parallel bus termination requiring stable component supply and long-term manufacturability.
Supply support for QSBT40-7-F 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability protection, power management, and signal integrity solutions for industrial and computing markets.
The QSBT40 belongs to Diodes' bus termination and ESD protection product line, engineered specifically for high-speed digital interface reliability-balancing low capacitance, fast recovery, and certified transient immunity in compact packages.
FAQ
What is the maximum recommended trace length for QSBT40-7-F in a 480 Mbps USB 2.0 application?
For optimal signal integrity, keep the distance between QSBT40-7-F's DL pins and the USB connector ≤30 mm on 50 Ω controlled-impedance traces. Longer runs increase stub effects; the device's 6.5 pF inter-line capacitance and 5 ns trr allow stable operation up to 500 Mbps when placed within 15 mm of the connector per Diodes AP02001 layout guidelines.
Can QSBT40-7-F be used with 1.8 V logic systems?
Yes-QSBT40-7-F operates with VCC as low as 1.8 V. At 1.8 V supply, VF remains ≤350 mV at 1 mA, preserving sufficient noise margin for 1.8 V LVCMOS. However, reverse breakdown remains fixed at 30 V, so transient clamping headroom is unchanged; verify system-level ESD test compliance with actual 1.8 V rail decoupling.
Does QSBT40-7-F require external current-limiting resistors on data lines?
No-QSBT40-7-F is designed for direct connection between data lines and VCC/GND without series resistors. Its 200 mA IFM rating and thermal resistance (625 °C/W) support typical bus bias currents (<10 mA). External resistors are unnecessary unless intentional current limiting is needed for fault-current management in fail-safe designs.
How does the guard ring structure improve ESD performance compared to standard Schottky diodes?
The integrated PN junction guard ring surrounds each Schottky anode, diverting ESD current away from the sensitive metal-semiconductor interface. This reduces localized heating and prevents permanent damage during 15 kV air-gap discharges, enabling repeatable performance over 100,000 ESD events-unachievable with non-guarded Schottky devices per IEC61000-4-2 testing.
QSBT40-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- 6-TSSOP, SC-88, SOT-363
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Steering (Rail to Rail)
- Unidirectional Channels:
- 4
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 30V
- Voltage - Breakdown (Min):
- -
- Voltage - Clamping (Max) @ Ipp:
- -
- Current - Peak Pulse (10/1000µs):
- -
- Power - Peak Pulse:
- -
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 10pF @ 1MHz
- Operating Temperature:
- -55°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-363
QSBT40-7-F FAQ
1.How can I place an order for QSBT40-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for QSBT40-7-F 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 QSBT40-7-F reliable?
The price and inventory of QSBT40-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for QSBT40-7-F is usually 5 days.
3.What payment methods are accepted for QSBT40-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for QSBT40-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for QSBT40-7-F?
QSBT40-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your QSBT40-7-F 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 QSBT40-7-F?
For technical support, including QSBT40-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your QSBT40-7-F requirements.
6.How does Aetrix verify that QSBT40-7-F is sourced from the original manufacturer or authorized distributors?
All QSBT40-7-F 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 QSBT40-7-F meets industry standards.
7.What is the process for return or replacement of QSBT40-7-F?
All QSBT40-7-F units undergo pre-shipment inspection (PSI). If there is an issue with QSBT40-7-F, 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 QSBT40-7-F part is unused and in its original packaging.
Return procedure for QSBT40-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
QSBT40-7-F 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…
