My Inquiry
My Account
onsemi 1SMA9.0AT3G
- Part No.:
- 1SMA9.0AT3G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
1SMA9.0AT3G.pdf
- Description:
- TVS DIODE 9VWM 15.4VC 6TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:9,195
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1SMA9.0AT3G from ON Semiconductor is a unidirectional 400 W peak power Zener transient voltage suppressor (TVS) designed for clamping overvoltage transients in DC power rails and signal lines. It features a 9.0 V working peak reverse voltage (VRWM), 15.4 V clamping voltage at 26.0 A peak pulse current, and <1 ns response time. It is used in automotive power supply protection, industrial I/O interface surge hardening, and medical equipment input stage safeguarding.
For engineers reviewing the 1SMA9.0AT3G datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM margin vs. operating voltage, clamping voltage headroom relative to protected IC absolute maximum ratings, surge current capability under 10/1000 µs waveform, and thermal derating behavior at elevated ambient temperatures.
Technical Context
The 1SMA9.0AT3G operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 10.0–11.1 V breakdown range at 1 mA test current. Its low zener impedance and fast <1 ns response enable effective suppression of ESD and lightning-induced transients before downstream components experience overstress.
It is rated for 400 W peak pulse power (10/1000 µs waveform), with thermal resistance of 250 °C/W junction-to-ambient on FR-4 board and 50 °C/W junction-to-lead. The device meets Class 3 HBM ESD rating (>16 kV) and is Pb-free, AEC-Q101 qualified in the SURMETIC® SMA package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 9.0 V - Maximum continuous reverse operating voltage before clamping begins; must exceed circuit's normal DC or peak AC voltage. |
| VBR @ IT=1 mA | 10.0–11.1 V - Breakdown voltage tolerance band; defines minimum and maximum turn-on threshold under standardized test conditions. |
| VC @ IPP=26.0 A | 15.4 V - Clamping voltage during 400 W transient; determines maximum stress imposed on protected load during surge event. |
| IPP | 26.0 A - Peak pulse current at 400 W, 10/1000 µs waveform; quantifies surge energy handling capacity before failure. |
| C Typ. @ 0 V, 1 MHz | 1200 pF - Junction capacitance at zero bias; impacts high-frequency signal integrity in data line protection applications. |
| IR @ VRWM | 2.5 µA - Reverse leakage at rated working voltage; ensures minimal standby power loss and signal distortion in high-impedance circuits. |
| Response Time | <1 ns - Time from transient onset to clamping activation; critical for protecting fast logic and communication interfaces. |
Pinout & Package
The 1SMA9.0AT3G is housed in an SMA (DO-214AC) surface-mount package per CASE 403D, featuring a flat handling surface, low profile, and polarity band indicating the cathode terminal. Mounting position is unrestricted; soldering temperature limit is 260°C for 10 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked by band) | Transient clamp output node | Connected to protected line; conducts avalanche current to ground during overvoltage events. |
| Anode | Reference/return path | Typically tied to system ground or lowest potential rail; completes current path during clamping operation. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 µs) | Enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV line-earth) without derating in compact layouts. |
| Class 3 HBM ESD rating (>16 kV) | Eliminates need for secondary ESD protection in human-accessible ports such as USB, RS-485, or front-panel controls. |
| AEC-Q101 qualified (SZ prefix variant available) | Validated for automotive under-hood and infotainment applications requiring extended temperature (-65°C to +150°C) reliability. |
| Low-profile SURMETIC® package | Reduces board space and improves thermal coupling to copper pour; compatible with standard SMT reflow profiles. |
| Flat handling surface | Ensures consistent pick-and-place accuracy and minimizes tombstoning risk during automated assembly. |
Applications
| Automotive Power Rail Protection | Industrial PLC Digital Input Protection |
|---|---|
|
Use Scenario: Suppresses load dump and alternator ripple transients on 12 V battery-fed ECUs and body control modules. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp spikes up to ±100 V. Use Value: Limits rail voltage to ≤15.4 V during 26 A transients, preventing damage to 16 V-rated LDOs and microcontrollers. |
Use Scenario: Guards 24 V digital input channels in programmable logic controllers against field-wiring induced surges. IC Role / Device Role / Timing Role: Standoff diode connected anode-to-ground, cathode-to-input, clamping negative transients on dry-contact inputs. Use Value: Withstands repeated 400 W surges while maintaining <2.5 µA leakage at 24 V nominal, preserving input threshold accuracy. |
| Medical Equipment Front-End Surge Suppression | Telecom Power Supply Inrush & Transient Control |
|
Use Scenario: Shields isolated DC-DC converter inputs in patient-connected devices from ESD and defibrillator discharge coupling. IC Role / Device Role / Timing Role: Primary overvoltage clamp on secondary-side 5 V/12 V rails, coordinated with upstream fusing. Use Value: Responds in <1 ns to 8 kV contact ESD, limiting stress on optocouplers and isolation barriers to safe levels. |
Use Scenario: Protects AC-DC adapter outputs and PoE injectors against lightning-induced common-mode surges on Ethernet or DC distribution lines. IC Role / Device Role / Timing Role: Unidirectional clamp on positive output rail, sized to absorb 10/1000 µs transients per IEC 61000-4-5. Use Value: Delivers 400 W peak dissipation with 1200 pF capacitance-low enough to avoid signal degradation on 100 Mbps Ethernet power pairs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SZ1SMA9.0AT3G | AEC-Q101 qualified, PPAP-capable, identical electrical specs and package; includes SZ prefix for automotive traceability. | Required for automotive OEM designs needing certified change control and lot-level documentation. | Select SZ1SMA9.0AT3G when automotive qualification, PPAP submission, or site-specific manufacturing control is mandatory. |
| 1.5SMC9.0A | Same VRWM (9.0 V) and VC (15.4 V), but higher 1500 W peak power rating and larger SMC (DO-214AB) package (7.11 × 6.22 mm). | Suitable where higher surge margin is needed and PCB area allows larger footprint; not drop-in due to different pad layout. | Choose 1.5SMC9.0A only if 1500 W surge rating is required and mechanical redesign is acceptable. |
Compared with 1SMA9.0AT3G, SZ1SMA9.0AT3G offers identical protection performance with added automotive compliance overhead, while 1.5SMC9.0A trades compactness for higher surge capacity-making 1SMA9.0AT3G optimal for space-constrained industrial and medical designs requiring proven 400 W robustness.
Availability
1SMA9.0AT3G is available at Aetrix Electronics and suitable for automotive power rail protection, industrial PLC input hardening, and medical equipment front-end surge suppression requiring stable component supply across multi-year production cycles.
Supply support for 1SMA9.0AT3G 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
ON Semiconductor is a global semiconductor manufacturer specializing in power management, analog, sensor, and discrete solutions for automotive, industrial, and communications markets.
The 1SMA9.0AT3G belongs to ON Semiconductor's SMA-series unidirectional TVS family, engineered for cost-effective, high-reliability overvoltage protection in space-constrained surface-mount applications.
FAQ
What is the clamping voltage of the 1SMA9.0AT3G and how is it measured?
The 1SMA9.0AT3G has a maximum clamping voltage (VC) of 15.4 V, measured at a peak pulse current (IPP) of 26.0 A using the standard 10/1000 µs double-exponential surge waveform. This value represents the highest voltage the device allows across its terminals during a 400 W transient event, ensuring downstream components remain within safe operating limits. The 1SMA9.0AT3G achieves this clamping performance consistently across its specified temperature range of −65°C to +150°C.
Is the 1SMA9.0AT3G suitable for bidirectional signal line protection?
No, the 1SMA9.0AT3G is a unidirectional TVS diode and is not suitable for bidirectional signal line protection. It conducts only during negative transients on the cathode side and blocks positive voltage beyond its forward voltage (~3.5 V). For bidirectional applications such as RS-485 or USB data lines, a dedicated bidirectional TVS like the 1SMA9.0AT3 (non-G suffix) or SMAJ9.0A must be selected. The 1SMA9.0AT3G is intended for DC power rail or single-polarity signal protection.
What is the junction capacitance of the 1SMA9.0AT3G and why does it matter?
The 1SMA9.0AT3G exhibits a typical junction capacitance (C) of 1200 pF at 0 V bias and 1 MHz, as measured per the datasheet. This parameter directly affects high-frequency signal integrity: in data line protection, excessive capacitance can attenuate edges or cause timing skew. At 1200 pF, the 1SMA9.0AT3G is appropriate for lower-speed interfaces (e.g., CAN, RS-232) but generally unsuitable for USB 2.0 or HDMI without additional filtering.
How does thermal derating affect the 1SMA9.0AT3G's surge capability at elevated temperatures?
The 1SMA9.0AT3G's peak pulse power remains 400 W up to 25°C ambient, but derates linearly above that point per Figure 3 in the datasheet. At 75°C, its usable peak power drops to ~250 W; at 125°C, it falls to ~120 W. This occurs because junction temperature rise during surge reduces avalanche stability. To maintain full 400 W capability, ensure board layout provides adequate copper pour and airflow, or select a higher-rated device like the 1.5SMC9.0A for high-temperature environments.
Can the 1SMA9.0AT3G replace the 1N6267A in existing designs?
The 1SMA9.0AT3G is not a direct replacement for the through-hole 1N6267A due to differences in package (SMA vs. DO-41), thermal resistance (250 °C/W vs. ~100 °C/W), and mounting method. While both share similar VRWM (9.0 V) and VC (15.4 V), the 1SMA9.0AT3G's surface-mount form factor requires PCB redesign. Its lower thermal mass also demands careful attention to layout copper and surge repetition rate. Use 1SMA9.0AT3G only in new SMT designs or after validating thermal and mechanical performance in the target application.
1SMA9.0AT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-214AC, SMA
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 9V
- Voltage - Breakdown (Min):
- 10V
- Voltage - Clamping (Max) @ Ipp:
- 15.4V
- Current - Peak Pulse (10/1000µs):
- 26A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 1200pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
1SMA9.0AT3G FAQ
1.How can I place an order for 1SMA9.0AT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA9.0AT3G 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 1SMA9.0AT3G reliable?
The price and inventory of 1SMA9.0AT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA9.0AT3G is usually 5 days.
3.What payment methods are accepted for 1SMA9.0AT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA9.0AT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA9.0AT3G?
1SMA9.0AT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA9.0AT3G 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 1SMA9.0AT3G?
For technical support, including 1SMA9.0AT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA9.0AT3G requirements.
6.How does Aetrix verify that 1SMA9.0AT3G is sourced from the original manufacturer or authorized distributors?
All 1SMA9.0AT3G 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 1SMA9.0AT3G meets industry standards.
7.What is the process for return or replacement of 1SMA9.0AT3G?
All 1SMA9.0AT3G units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA9.0AT3G, 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 1SMA9.0AT3G part is unused and in its original packaging.
Return procedure for 1SMA9.0AT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMA9.0AT3G 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
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
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…
