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Diodes Incorporated DFLT22AQ-7
- Part No.:
- DFLT22AQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- POWERDI®123
- Datasheet:
-
DFLT22AQ-7.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PDI
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
DFLT22AQ-7 from Diodes Incorporated is an AEC-Q101 qualified automotive-grade transient voltage suppressor (TVS) diode in PowerDI 123 package, featuring 22 V reverse standoff voltage, 35.5 V max clamping voltage at 6.34 A peak pulse current, and 225 W peak pulse power (10/1000 µs waveform). It protects CAN, LIN, and sensor interfaces in engine control units and body electronics against ESD and load dump transients.
For engineers reviewing the DFLT22AQ-7 datasheet, DFLT22AQ-7 pinout, DFLT22AQ-7 application, or DFLT22AQ-7 equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/5a, thermal resistance (RθJS = 6 °C/W), AEC-Q101 qualification status, and compatibility with 8 mm tape-and-reel handling for SMT assembly.
Technical Context
This unidirectional TVS diode operates in avalanche breakdown mode to clamp transient overvoltages above its 22 V standoff threshold. Its low RθJS (6 °C/W) enables effective heat transfer from junction to PCB cathode pad, supporting sustained surge handling in confined automotive PCB layouts.
Designed for bidirectional protection circuits requiring polarity-specific suppression, it delivers 9.2 µA max reverse leakage at VRWM and exhibits 24.4 pF typical capacitance at 0 V bias - critical for preserving signal integrity in 1 Mbps CAN FD and 20 kbps LIN bus nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Standoff Voltage | 22 V - Maximum continuous DC operating voltage before clamping initiates; sets system-level overvoltage margin for 12 V automotive buses. |
| Breakdown Voltage (Min/Max) | 24.4 V / 26.9 V @ 1 mA - Confirmed avalanche onset range ensures consistent turn-on across temperature and unit variation. |
| Max Clamping Voltage | 35.5 V @ 6.34 A - Limits downstream IC stress during ISO 7637-2 Pulse 5a (load dump); enables use with 36 V tolerant receivers. |
| Peak Pulse Power | 225 W (10/1000 µs) - Supports single-event surge immunity per IEC 61000-4-5 Level 3 (1 kV line-to-ground). |
| Thermal Resistance (Junction-to-Solder) | 6 °C/W - Enables >1 W steady-state dissipation on minimal copper area; reduces need for thermal vias in space-constrained modules. |
| Capacitance @ 0 V | 24.4 pF - Low enough to avoid signal rise-time degradation in 125 kbps–1 Mbps automotive serial buses. |
Pinout & Package
Package: PowerDI 123 - surface-mount, single-anode/single-cathode plastic package with exposed cathode tab for thermal and electrical connection. Dimensions: 1.78 mm × 3.70 mm × 0.98 mm (L × W × H); weight ≈ 0.01 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point during positive surges | Connected to protected line (e.g., CAN_H); must route with low-inductance trace to minimize overshoot. |
| Cathode | Clamped output terminal and thermal path | Mounted directly to PCB copper pour or thermal pad; serves as primary heat sink and return path to ground. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive underhood operation (-55 °C to +150 °C) with PPAP documentation support and IATF 16949 manufacturing. |
| Green compound & RoHS compliance | Halogen-free (<900 ppm Br/Cl, <1000 ppm Sb) and lead-free matte tin finish compatible with Pb-free reflow profiles. |
| Low clamping ratio | VC/VRWM = 1.61 - tighter than typical 1.7–2.0 ratio, reducing voltage stress on downstream 24 V-rated transceivers. |
| Moisture sensitivity level | MSL Level 1 - no dry-pack or bake required prior to assembly, simplifying SMT line logistics. |
Applications
| Engine Control Unit (ECU) | CAN Transceiver Protection |
|---|---|
Use Scenario: Suppresses load dump transients (ISO 7637-2 Pulse 5a) induced by alternator regulation failure in 12 V power distribution networks feeding microcontrollers and analog sensors. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and LDO input to limit voltage excursion to ≤35.5 V during 100 ms surges. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V supply regulators without requiring oversized input capacitors or series impedance. |
Use Scenario: Protects high-speed CAN_H/CAN_L differential pair against ESD (IEC 61000-4-2 ±8 kV contact) and coupled noise in vehicle networking gateways. IC Role / Device Role / Timing Role: One DFLT22AQ-7 per line (CAN_H and CAN_L each), mounted adjacent to connector with short traces to minimize inductance. Use Value: Maintains <25 pF line capacitance to preserve 1 Mbps bit timing while clamping fast transients below receiver absolute maximum ratings. |
| LIN Bus Sensor Node | Body Control Module (BCM) Input Protection |
Use Scenario: Shields LIN slave devices (e.g., door lock actuators, ambient light sensors) from battery reversal and jump-start induced surges in 12 V harnesses. IC Role / Device Role / Timing Role: Placed at connector entry point before LIN transceiver, with cathode tied to local ground plane. Use Value: Enables robust operation at 20 kbps with <10 ns response time and no signal distortion due to sub-30 pF capacitance. |
Use Scenario: Guards discrete input pins (e.g., ignition sense, hood open switch) in BCMs against inductive kickback from relay coils and motor loads. IC Role / Device Role / Timing Role: Mounted directly at header pin with Kelvin-style ground return to minimize clamping voltage overshoot. Use Value: Withstands 50 A surge current (IFSM) and provides stable 22 V standoff for reliable logic-level detection under noisy 12 V conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22A | Same 22 V standoff but SMA package (RθJA = 50 °C/W vs. 6 °C/W); 400 W peak power (10/1000 µs); higher leakage (5 µA max). | Less suitable for high-density automotive modules due to larger footprint and inferior thermal coupling to PCB. | Select only if legacy SMA footprint compatibility is required and thermal derating margins allow. |
| TPSMD22A | 22 V standoff, 35.5 V clamping, but SOD-123FL package; RθJS = 12 °C/W; AEC-Q101 qualified; 200 W peak power. | Lower thermal performance limits sustained surge duty cycle; not recommended for underhood ECUs with frequent load dump events. | Preferable for cost-sensitive cabin modules where ambient temperature stays <105 °C and surge frequency is low. |
Compared with SMAJ22A and TPSMD22A, DFLT22AQ-7 offers superior thermal management (RθJS = 6 °C/W) and tighter clamping ratio (1.61), making it optimal for space-constrained, thermally demanding automotive control units requiring repeatable surge immunity.
Availability
DFLT22AQ-7 is available at Aetrix Electronics and suitable for engine control units, CAN/LIN bus nodes, and body control module inputs requiring stable component supply with full automotive traceability and AEC-Q101 compliance.
Supply support for DFLT22AQ-7 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 components for automotive, industrial, and computing markets.
The DFLTxxxAQ series targets automotive transient suppression with AEC-Q101 qualification, green packaging, and optimized thermal performance for underhood and chassis-mounted electronics.
FAQ
What is the maximum operating temperature for DFLT22AQ-7?
DFLT22AQ-7 is rated for junction temperatures from –55 °C to +150 °C, with full electrical specifications guaranteed across this range. Its PowerDI 123 package achieves RθJS = 6 °C/W, enabling reliable operation at +150 °C ambient when mounted on ≥1 inch² 2 oz copper with thermal vias.
Does DFLT22AQ-7 meet ISO 7637-2 test requirements?
Yes - DFLT22AQ-7 clamps to 35.5 V at 6.34 A (10/1000 µs), satisfying ISO 7637-2 Pulse 1 (–150 V/2 Ω) and Pulse 5a (75 V/12 Ω) limits for 12 V systems. Its 225 W peak power rating covers the energy profile of standardized load dump waveforms.
How is polarity identified on the DFLT22AQ-7 package?
Polarity is marked by a cathode band on the top surface of the PowerDI 123 case. The cathode terminal connects to the larger exposed metal tab on the bottom side; the anode is the smaller lead on the opposite edge. This matches standard unidirectional TVS orientation for battery-line protection.
Can DFLT22AQ-7 be used in parallel for higher surge current handling?
No - paralleling TVS diodes causes current imbalance due to VBR tolerance (24.4–26.9 V). Even minor mismatch leads to one device absorbing >80% of surge energy, risking premature failure. For >6.34 A peak current, select a higher-rated part like DFLT24AQ-7 or use external current-sharing resistors (not recommended for automotive).
DFLT22AQ-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- POWERDI®123
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 35.5V
- Current - Peak Pulse (10/1000µs):
- 6.34A
- Power - Peak Pulse:
- 225W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PowerDI™ 123
DFLT22AQ-7 FAQ
1.How can I place an order for DFLT22AQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DFLT22AQ-7 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 DFLT22AQ-7 reliable?
The price and inventory of DFLT22AQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DFLT22AQ-7 is usually 5 days.
3.What payment methods are accepted for DFLT22AQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DFLT22AQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DFLT22AQ-7?
DFLT22AQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DFLT22AQ-7 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 DFLT22AQ-7?
For technical support, including DFLT22AQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DFLT22AQ-7 requirements.
6.How does Aetrix verify that DFLT22AQ-7 is sourced from the original manufacturer or authorized distributors?
All DFLT22AQ-7 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 DFLT22AQ-7 meets industry standards.
7.What is the process for return or replacement of DFLT22AQ-7?
All DFLT22AQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with DFLT22AQ-7, 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 DFLT22AQ-7 part is unused and in its original packaging.
Return procedure for DFLT22AQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DFLT22AQ-7 Tags
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Diodes Incorporated
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