My Inquiry
My Account
Alpha & Omega Semiconductor Inc. AOZ8320DI-18
- Part No.:
- AOZ8320DI-18
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- 0603 (1608 Metric)
- Datasheet:
-
AOZ8320DI-18.pdf
- Description:
- TVS DIODE 18VWM 39VC 2DFN
- Quantity:
- Payment:
- Shipping:
Inventory:6,129
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AOZ8320DI-18 from Alpha & Omega Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for single-line surge and ESD protection on 18V power rails, featuring 18V reverse working voltage (VRWM), 35A peak pulse current (8/20µs), 1200W peak pulse power, 200pF junction capacitance, and operation across –40°C to +125°C ambient temperature - deployed in USB voltage buses and battery protection circuits.
For engineers reviewing the AOZ8320DI-18 datasheet, pinout, applications, or equivalent options, key selection criteria include clamping voltage under 39V at 35A, dynamic resistance of 0.1Ω, IEC 61000-4-2 ±30kV contact/air ESD rating, and DFN1.6×0.8_2L package compatibility with high-density mobile PCB layouts.
Technical Context
The AOZ8320DI-18 implements a silicon avalanche diode structure optimized for low-clamp, high-power transient suppression on DC power lines. Its unidirectional configuration provides forward conduction only during negative transients, with precise breakdown at 19–24V and clamping as low as 22V at 1A TLP.
It meets IEC 61000-4-5 (8/20µs surge up to 35A), IEC 61000-4-2 (±30kV air/contact), and IEC 61000-4-4 (80A EFT), while maintaining sub-100nA leakage at 18V and 25°C - enabling robust protection without compromising standby power integrity in battery-fed systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Working Voltage (VRWM) | 18V - defines maximum continuous DC operating voltage before leakage rises significantly; sets rail compatibility for 18V systems. |
| Peak Pulse Current (IPP) | 35A (8/20µs) - withstands high-energy surges per IEC 61000-4-5 without failure; supports industrial-grade immunity. |
| Clamping Voltage (VCL) | 35V at IPP = 35A - limits voltage seen by downstream ICs during worst-case surge; protects 20V-tolerant components. |
| Junction Capacitance (CJ) | 200pF at 0V, 1MHz - low enough to avoid signal integrity degradation on 18V power rails with moderate slew rates. |
| Dynamic Resistance (RDNY) | 0.1Ω - ensures rapid voltage stabilization during fast transients; reduces overshoot and energy dissipation time. |
| ESD Rating (IEC 61000-4-2) | ±30kV air & contact - exceeds Level 4 requirement; eliminates need for secondary ESD stages in handheld designs. |
| Operating Temperature | –40°C to +125°C - supports automotive cabin, industrial control, and portable device environments without derating. |
Pinout & Package
AOZ8320DI-18 is housed in a RoHS-compliant, ultra-small DFN1.6×0.8_2L surface-mount package with two terminals: Pin 1 (Anode) and Pin 2 (Cathode), optimized for minimal PCB area and thermal performance in space-constrained applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode) | Input/Power Line Terminal | Connected to protected 18V rail; conducts during negative transients to shunt current to ground. |
| Pin 2 (Cathode) | Ground Reference Terminal | Connected to system ground plane; establishes reference for clamping action and defines unidirectional polarity. |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional TVS architecture | Enables precise overvoltage clamping on positive-rail systems while blocking reverse leakage below 100nA at 18V. |
| IEC 61000-4-5 compliant surge handling | Withstands 35A (8/20µs) surge events without parametric shift - validated per standard test waveform. |
| Ultra-low dynamic resistance | 0.1Ω ensures <1V additional drop per 1A transient current, minimizing voltage overshoot during fast ESD events. |
| Low junction capacitance | 200pF avoids resonant coupling or filtering effects on 18V power distribution networks. |
| Green RoHS-compliant packaging | DFN1.6×0.8_2L meets halogen-free and lead-free requirements for consumer and medical end equipment. |
Applications
| USB Power Bus Protection | Battery Input Protection |
|---|---|
Use Scenario: Protecting 5V/9V/18V USB PD power delivery lines from hot-plug transients and cable-induced surges. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between VBUS and GND to clamp overvoltage before it reaches USB controller or PMIC. Use Value: Prevents latch-up or permanent damage to USB interface ICs during ±30kV ESD events and 35A surge pulses. |
Use Scenario: Safeguarding lithium-ion battery input terminals in portable electronics against charging circuit faults and load dump. IC Role / Device Role / Timing Role: Primary surge suppression element on battery feed line, activated within nanoseconds of overvoltage onset. Use Value: Limits clamped voltage to ≤39V at full 35A surge, preserving battery management ICs rated to 40V absolute maximum. |
| Mobile Device Power Rails | Industrial Display Panel Supplies |
Use Scenario: Securing internal 18V backlight or camera module power rails in smartphones and tablets exposed to handling ESD. IC Role / Device Role / Timing Role: Standalone TVS mounted directly at point-of-load to minimize inductance and maximize clamping speed. Use Value: Delivers <10ns response time and 200pF capacitance - no signal distortion on high-current analog power paths. |
Use Scenario: Hardening 18V logic supply rails in outdoor kiosks and HMI panels subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Frontline protection component on main power entry, coordinated with upstream fuses and filters. Use Value: Sustains 1200W peak pulse power without thermal runaway, verified over 1000-hour HTRB reliability testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A | DO-214AC package (5.3mm × 4.5mm); 400W peak power; 55A IPP; 27.7V clamping at 32.4A. | Larger footprint; higher clamping voltage; suited for board-level rather than ultra-dense mobile layouts. | Select SMAJ18A when board space allows larger packages and higher surge margin is prioritized over capacitance and size. |
| TPD4E001DPYR | Quad-channel 0.5pF ESD array in DFN1.0×0.6_6L; 5.5V VRWM; not rated for 18V rail or IEC 61000-4-5 surge. | Designed for high-speed data lines (USB 2.0, HDMI), not power rail protection; insufficient voltage rating for AOZ8320DI-18 use cases. | Use TPD4E001DPYR only for signal-line ESD; never as direct replacement for AOZ8320DI-18 on 18V power rails. |
Compared with SMAJ18A and TPD4E001DPYR, the AOZ8320DI-18 uniquely balances 18V rail compatibility, 35A surge capability, 200pF capacitance, and 1.6mm × 0.8mm footprint - making it optimal for space-constrained, high-reliability 18V power protection where both ESD and surge immunity are required.
Availability
AOZ8320DI-18 is available at Aetrix Electronics and suitable for USB voltage bus protection, battery input safeguarding, and mobile device power rail hardening requiring stable component supply, consistent parametric performance, and long-term lifecycle support.
Supply support for AOZ8320DI-18 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
Alpha & Omega Semiconductor (AOS) is a fabless power semiconductor company specializing in high-efficiency MOSFETs, TVS diodes, and power ICs for computing, consumer, and industrial markets.
The AOZ8320DI series was developed specifically for compact, high-power transient suppression on low-voltage DC rails - targeting mobile, USB, and battery-powered systems needing certified ESD/surge resilience in minimal footprint.
FAQ
What is the maximum clamping voltage of AOZ8320DI-18 under full-rated surge current?
The AOZ8320DI-18 clamps to a maximum of 39V at –35A (8/20µs surge), and 35V at +35A, per IEC 61000-4-5 testing conditions. This value is measured across the device terminals with specified test setup and confirms protection of downstream 40V-rated ICs. The AOZ8320DI-18 datasheet specifies these limits on Page 6 under "Clamping Voltage" with IPP = ±35A.
Does AOZ8320DI-18 support bidirectional transient suppression?
No, AOZ8320DI-18 is a unidirectional TVS diode - it clamps only positive transients relative to ground (anode-to-cathode) and conducts during negative excursions on the cathode side. It is not rated for symmetrical ±18V operation. For bidirectional protection, a separate design using two AOZ8320DI-18 devices or a dedicated bidirectional TVS like AOZ8230DI would be required.
What is the recommended PCB land pattern for AOZ8320DI-18?
The manufacturer specifies a DFN1.6×0.8_2L land pattern with 0.5mm pad width, 0.8mm pad length, and 0.6mm center-to-center spacing - detailed in Page 9 of the AOZ8320DI datasheet. Thermal relief and solder mask defined pads are advised to ensure mechanical stability and thermal dissipation. Use of this exact pattern prevents tombstoning and ensures reliable reflow for AOZ8320DI-18.
Is AOZ8320DI-18 compliant with automotive AEC-Q200 stress testing?
No, AOZ8320DI-18 is not AEC-Q200 qualified. Its qualification report (Page 11) covers JESD22-A108 HTRB, JESD22-A113 preconditioning, and JESD22-A110 HAST - confirming industrial-grade reliability - but does not include temperature cycling, vibration, or humidity testing required for AEC-Q200. AOZ8320DI-18 is intended for commercial and industrial applications, not automotive ECUs.
How does AOZ8320DI-18 compare to AOZ8320DI-12 in terms of surge capability?
AOZ8320DI-18 has lower peak pulse current (35A vs. 45A) and lower clamping voltage headroom (39V vs. 30V at full IPP) than AOZ8320DI-12, reflecting its optimization for higher-voltage rails where lower current surges are typical. Both share identical package, temperature range, and ESD ratings, but AOZ8320DI-18's 18V VRWM makes it unsuitable for 12V-only systems due to increased leakage risk below breakdown threshold.
AOZ8320DI-18 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Package/Case:
- 0603 (1608 Metric)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 18V (Max)
- Voltage - Breakdown (Min):
- 19V
- Voltage - Clamping (Max) @ Ipp:
- 39V
- Current - Peak Pulse (10/1000µs):
- 35A (8/20µs)
- Power - Peak Pulse:
- 1200W (1.2kW)
- Power Line Protection:
- No
- Applications:
- USB
- Capacitance @ Frequency:
- 200pF @ 1MHz
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 2-DFN (1.6x.8)
AOZ8320DI-18 FAQ
1.How can I place an order for AOZ8320DI-18 through Aetrix?
Please submit a Request for Quotation (RFQ) for AOZ8320DI-18 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 AOZ8320DI-18 reliable?
The price and inventory of AOZ8320DI-18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AOZ8320DI-18 is usually 5 days.
3.What payment methods are accepted for AOZ8320DI-18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AOZ8320DI-18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AOZ8320DI-18?
AOZ8320DI-18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AOZ8320DI-18 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 AOZ8320DI-18?
For technical support, including AOZ8320DI-18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AOZ8320DI-18 requirements.
6.How does Aetrix verify that AOZ8320DI-18 is sourced from the original manufacturer or authorized distributors?
All AOZ8320DI-18 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 AOZ8320DI-18 meets industry standards.
7.What is the process for return or replacement of AOZ8320DI-18?
All AOZ8320DI-18 units undergo pre-shipment inspection (PSI). If there is an issue with AOZ8320DI-18, 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 AOZ8320DI-18 part is unused and in its original packaging.
Return procedure for AOZ8320DI-18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AOZ8320DI-18 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 and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
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…
