My Inquiry
My Account
onsemi P6SMB9.1AT3
- Part No.:
- P6SMB9.1AT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
P6SMB9.1AT3.pdf
- Description:
- TVS DIODE 7.78VWM 13.4VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:4,093
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
P6SMB9.1AT3 from ON Semiconductor is a unidirectional 600 W transient voltage suppressor (TVS) diode designed for parallel overvoltage protection of DC power rails and signal lines. It features a 7.78 V working peak reverse voltage (VRWM), 9.1 V nominal Zener breakdown voltage (VBR) at 1 mA test current, and clamps transients to ≤13.4 V at 45 A peak pulse current (IPP), making it suitable for protecting automotive ECUs, industrial power supplies, and communication interface circuits.
For engineers reviewing the P6SMB9.1AT3 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM margin above operating voltage, clamping voltage vs. device withstand rating, surge current capability under 1 ms 10/1000 µs waveform, and UL 497B recognition for isolated loop protection.
Technical Context
The P6SMB9.1AT3 operates as a silicon avalanche diode with fast <1 ns response time and low dynamic impedance, enabling effective suppression of ESD and lightning-induced surges. Its unidirectional configuration provides reverse-biased clamping only, requiring correct polarity placement across protected nodes.
Thermal design relies on junction-to-lead resistance of 40 °C/W and 3.0 W DC power dissipation at 75 °C lead temperature, with derating above that point. The device meets Class 3 HBM ESD rating (>16 kV) and is certified to UL 497B for isolated loop circuit protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 600 W @ 1 ms 10/1000 µs waveform - sustains high-energy transients without failure |
| Working Peak Reverse Voltage (VRWM) | 7.78 V - maximum continuous reverse voltage before significant leakage; sets minimum system operating margin |
| Zener Breakdown Voltage (VBR) | 9.1 V @ IT = 1 mA - precise voltage threshold for avalanche conduction onset |
| Clamping Voltage (VC) | 13.4 V @ IPP = 45 A - maximum voltage seen by protected circuit during surge |
| Leakage Current (IR) | 50 µA @ VRWM - ensures minimal standby power loss in always-on systems |
| Response Time | <1 ns - enables suppression before sensitive ICs experience overstress |
| ESD Rating | Class 3 HBM (>16 kV) - qualifies for harsh handling environments without pre-failure |
Pinout & Package
Package: SMB (Case 403A), surface-mount, Pb-free, void-free thermosetting plastic with cathode band polarity marking. Dimensions: 3.56 mm × 4.32 mm × 2.13 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND or return path) in unidirectional clamp configuration |
| Cathode | Avalanche clamping terminal | Marked with band; connected to protected line (e.g., +12 V rail or RS-485 bus) to clamp positive transients |
Key Features
| Feature | Design Value |
|---|---|
| UL 497B Recognition | Qualified for isolated loop circuit protection - meets safety-critical telecom and industrial isolation requirements |
| Low Clamping Ratio | VC/VBR = 1.47 - tight voltage control minimizes stress on downstream components |
| High Surge Robustness | 45 A IPP - handles IEC 61000-4-5 Level 4 surges (4 kV line-earth) with margin |
| Thermal Reliability | RJL = 40 °C/W - enables stable operation with minimal PCB copper area (1″² FR-4 pad) |
| Pb-Free Compliance | RoHS-compliant SURMETIC® package - supports lead-free reflow assembly per J-STD-020 |
Applications
| Automotive Body Control Module | Industrial PLC Digital Input |
|---|---|
Use Scenario: Protecting 12 V supply rail against load dump and ISO 7637-2 pulses in BCM microcontroller power domain. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VCC and GND to clamp positive transients exceeding 13.4 V. Use Value: Prevents MCU brownout or latch-up during 12 V battery disconnection events with 600 W peak absorption. |
Use Scenario: Safeguarding 24 V digital input channels from field-wiring induced surges in factory automation controllers. IC Role / Device Role / Timing Role: Parallel-connected TVS on each optocoupler input node to limit voltage to ≤13.4 V during surge. Use Value: Maintains input logic integrity under IEC 61000-4-4 EFT bursts while supporting UL 497B isolated loop compliance. |
| RS-485 Communication Port | AC-DC Adapter Secondary Side |
Use Scenario: Protecting differential RS-485 transceiver pins (A/B) against ESD and cable discharge events in building management systems. IC Role / Device Role / Timing Role: One P6SMB9.1AT3 per line (A-to-GND, B-to-GND) providing unidirectional clamping to ground. Use Value: Ensures >16 kV HBM ESD immunity without degrading signal integrity due to low 2380 pF junction capacitance at 0 V. |
Use Scenario: Clamping secondary-side rectifier output in offline SMPS to prevent transformer flyback overshoot from damaging output capacitors or regulators. IC Role / Device Role / Timing Role: TVS placed across secondary winding or post-rectifier to absorb energy from leakage inductance spikes. Use Value: Limits peak voltage to 13.4 V during 10/1000 µs transients, avoiding secondary-side MOSFET or capacitor overvoltage failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ9.0A | VRWM = 9.0 V, VBR = 10.0 V min, VC = 14.4 V @ 42 A - slightly higher clamping and lower surge rating | Less margin below 12 V rail; suited for tighter VRWM matching where 7.78 V is excessive | Select when system operating voltage is ≥9.0 V and clamping headroom >14.4 V is acceptable |
| 1.5SMC9.1A | Same VRWM/VBR/VC specs but in larger SMC package (DO-214AB); 1500 W peak power rating | Higher surge capacity but requires more PCB area; not drop-in compatible due to footprint mismatch | Choose for legacy designs needing 1.5 kW surge headroom or where SMB thermal limits are exceeded |
Compared with P6SMB9.1AT3, SMBJ9.0A offers tighter VRWM alignment but reduced surge margin, while 1.5SMC9.1A delivers triple the peak power in a non-compatible footprint - selection depends on layout constraints, surge severity, and voltage margin requirements.
Availability
P6SMB9.1AT3 is available at Aetrix Electronics and suitable for automotive electronics, industrial power supplies, and communication interface protection requiring stable component supply and full traceability.
Supply support for P6SMB9.1AT3 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 devices for automotive, industrial, and communications markets.
The P6SMB9.1AT3 belongs to the P6SMBxxAT3 series of 600 W unidirectional TVS diodes engineered for robust overvoltage protection in cost-sensitive, high-reliability applications such as automotive ECUs and industrial controls.
FAQ
What is the maximum clamping voltage of the P6SMB9.1AT3 under surge conditions?
The P6SMB9.1AT3 clamps to a maximum of 13.4 V when subjected to its rated peak pulse current of 45 A (10/1000 µs waveform). This value is measured per ON Semiconductor's standard test conditions and defines the upper voltage limit imposed on protected circuits during transient events. The P6SMB9.1AT3 maintains this clamping performance across its specified operating temperature range.
Is the P6SMB9.1AT3 RoHS compliant and lead-free?
Yes, the "G" suffix in P6SMB9.1AT3 indicates a Pb-free package compliant with RoHS Directive 2011/65/EU. The device uses ON Semiconductor's SURMETIC® molding compound and is qualified for lead-free reflow soldering up to 260°C for 10 seconds. The P6SMB9.1AT3 meets JEDEC J-STD-020 moisture sensitivity level 1 requirements.
Can the P6SMB9.1AT3 be used for bidirectional transient suppression?
No, the P6SMB9.1AT3 is strictly unidirectional and must be oriented with cathode toward the protected line. For bidirectional protection, ON Semiconductor specifies separate parts such as P6SMB9.1CAT3. Using P6SMB9.1AT3 in reverse-biased configurations outside its VRWM rating risks permanent damage. Always verify polarity in schematic and layout for the P6SMB9.1AT3.
What is the leakage current specification for the P6SMB9.1AT3 at its working voltage?
The P6SMB9.1AT3 exhibits a maximum reverse leakage current of 50 µA when biased at its working peak reverse voltage (VRWM) of 7.78 V. This low leakage ensures minimal power loss in always-on systems and avoids false triggering in high-impedance sensing circuits. The P6SMB9.1AT3 maintains this spec across its full −65°C to +150°C operating temperature range.
Does the P6SMB9.1AT3 have UL recognition for safety-critical applications?
Yes, the P6SMB9.1AT3 carries UL 497B recognition (File #E210057, Category QVGQ2) for use in isolated loop circuit protection. This certification covers dielectric withstand, strike voltage breakdown, endurance conditioning, and discharge testing - confirming suitability for telecom, medical, and industrial isolation barriers. The P6SMB9.1AT3 is not rated for surgical or life-support systems.
P6SMB9.1AT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-214AA, SMB
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 7.78V
- Voltage - Breakdown (Min):
- 8.65V
- Voltage - Clamping (Max) @ Ipp:
- 13.4V
- Current - Peak Pulse (10/1000µs):
- 45A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 1835pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
P6SMB9.1AT3 FAQ
1.How can I place an order for P6SMB9.1AT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for P6SMB9.1AT3 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 P6SMB9.1AT3 reliable?
The price and inventory of P6SMB9.1AT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P6SMB9.1AT3 is usually 5 days.
3.What payment methods are accepted for P6SMB9.1AT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P6SMB9.1AT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P6SMB9.1AT3?
P6SMB9.1AT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P6SMB9.1AT3 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 P6SMB9.1AT3?
For technical support, including P6SMB9.1AT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P6SMB9.1AT3 requirements.
6.How does Aetrix verify that P6SMB9.1AT3 is sourced from the original manufacturer or authorized distributors?
All P6SMB9.1AT3 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 P6SMB9.1AT3 meets industry standards.
7.What is the process for return or replacement of P6SMB9.1AT3?
All P6SMB9.1AT3 units undergo pre-shipment inspection (PSI). If there is an issue with P6SMB9.1AT3, 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 P6SMB9.1AT3 part is unused and in its original packaging.
Return procedure for P6SMB9.1AT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P6SMB9.1AT3 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…
