My Inquiry
My Account
onsemi P6SMB68CAT3
- Part No.:
- P6SMB68CAT3
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
P6SMB68CAT3.pdf
- Description:
- TVS DIODE 58.1VWM 92VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:2,759
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
P6SMB68CAT3 from ON Semiconductor is a bidirectional 600 W transient voltage suppressor (TVS) diode designed for overvoltage protection in DC power rails and signal lines. It features a 58.1 V working peak reverse voltage (VRWM), 68 V nominal Zener breakdown voltage (VBR) at 1 mA test current, and clamps transients to ≤92 V at 6.5 A peak pulse current - deployed in industrial power supplies, automotive ECUs, and medical equipment surge interfaces.
For engineers reviewing the P6SMB68CAT3 datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM margin vs. operating voltage, clamping voltage under specified IPP, UL 497B certification for isolated loop protection, low leakage (<5 µA @ 58.1 V), and SMB (DO-214AA) surface-mount compatibility with FR-4 PCB thermal design rules.
Technical Context
The P6SMB68CAT3 operates as a bidirectional avalanche diode, symmetrically clamping positive and negative transients above ±68 V breakdown. Its <1 ns response time and low dynamic impedance ensure fast suppression of ESD (Class 3, >16 kV HBM) and lightning-induced surges per IEC 61000-4-2/5.
Thermal design relies on junction-to-lead resistance (RJL = 40 °C/W) and derating curves: full 600 W rating applies only at TL = 25°C with 1 ms pulse; power must be reduced linearly above 75°C lead temperature or 25°C ambient per defined derating slopes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 600 W @ 1 ms non-repetitive pulse - sustains single high-energy surges without failure |
| Working Peak Reverse Voltage | 58.1 V - maximum continuous DC or peak AC voltage the device blocks before clamping |
| Zener Breakdown Voltage | 68 V (min 64.6 V, max 71.4 V) @ 1 mA - precise threshold for bidirectional avalanche conduction |
| Clamping Voltage | ≤92 V @ 6.5 A peak pulse current - limits protected circuit voltage during surge |
| Leakage Current | <5 µA @ 58.1 V - negligible standby power loss and minimal loading on source |
| Junction Capacitance | 155 pF @ 0 V, 1 MHz - impacts high-frequency signal integrity in data line protection |
| UL Recognition | UL 497B certified (File #E210057) - validated for isolated loop circuit protection in safety-critical systems |
Pinout & Package
Package: SMB (DO-214AA), surface-mount plastic case per Case Outline 403A. Dimensions: 4.06–4.60 mm length × 3.30–3.95 mm width × 1.90–2.45 mm height. Polarity band not marked; bidirectional operation eliminates anode/cathode orientation dependency.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked end) | Transient current sink (bidirectional) | Acts as common terminal for both polarities; connects to protected line or ground reference |
| Anode (unmarked end) | Transient current sink (bidirectional) | Functionally identical to cathode due to symmetrical structure; no directional mounting required |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC lines or floating DC buses without polarity constraints |
| 600 W surge rating | Withstands IEC 61000-4-5 Level 4 (4 kV, 2 Ω source) surges with margin |
| UL 497B recognition | Validated for use in telecom and industrial isolated loop protectors per safety standard |
| ESD Class 3 compliance | Survives >16 kV human-body-model discharges - suitable for front-panel and connector interfaces |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes overvoltage stress on downstream ICs compared to higher-ratio TVS devices |
Applications
| Industrial Power Supply Input Protection | Automotive Body Control Module (BCM) CAN Bus Protection |
|---|---|
Use Scenario: 24 V DC input stage of programmable logic controller (PLC) power supply exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed across input terminals to shunt surge energy before upstream converter. Use Value: Clamps 120 V/6.5 A transients to ≤92 V within <1 ns, preventing MOSFET gate oxide rupture and bulk capacitor overvoltage. | Use Scenario: CAN_H/CAN_L differential pair in vehicle BCM subjected to ESD and battery reversal transients. IC Role / Device Role / Timing Role: Bidirectional TVS connected between CAN_H and CAN_L lines to suppress common-mode surges without disrupting differential signaling. Use Value: Symmetric 68 V breakdown ensures equal clamping on both polarities; 155 pF capacitance avoids CAN bit-rate degradation at 500 kbps. |
| Medical Equipment Isolated Sensor Interface | Point-of-Sale Terminal AC Adapter Surge Protection |
Use Scenario: 5 V analog sensor signal path crossing isolation barrier in patient-monitoring device. IC Role / Device Role / Timing Role: Secondary-side TVS on isolated output rail to prevent transient coupling into sensitive ADC front-end. Use Value: UL 497B certification confirms suitability for isolated loop protection; <5 µA leakage avoids sensor offset errors. | Use Scenario: Secondary-side DC output (12 V) of wall adapter powering retail POS terminal. IC Role / Device Role / Timing Role: Final-stage clamp before LDO regulator to absorb residual surges escaping primary-side MOV protection. Use Value: 600 W rating handles repeated 10/1000 µs surges from poor-quality mains; SMB footprint enables compact layout near connector. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ64CA | 64 V VBR, 90.5 V VC @ 6.6 A, same SMB package | Lower clamping voltage but 4 V lower VRWM - less margin against 58 V nominal bus | Select when tighter clamping is prioritized over VRWM headroom |
| 1.5SMC68CA | Same 68 V VBR, but 1500 W rating, larger SMC (DO-214AB) package | Higher surge capacity requires larger PCB area and different thermal pad layout | Select for higher-energy threat environments where 600 W is insufficient |
Compared with SMBJ64CA and 1.5SMC68CA, the P6SMB68CAT3 delivers optimal balance of VRWM margin (58.1 V), clamping performance (92 V), and SMB footprint density - making it preferred for space-constrained 24–48 V industrial and automotive modules requiring UL-certified protection.
Availability
P6SMB68CAT3 is available at Aetrix Electronics and suitable for industrial power supplies, automotive control units, and medical sensor interfaces requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for P6SMB68CAT3 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 (now onsemi) is a global semiconductor supplier specializing in power management, analog, sensors, and discrete components for automotive, industrial, and cloud power applications.
The P6SMB68CAT3 belongs to the P6SMBxxCAT3 series of 600 W bidirectional TVS diodes engineered specifically for robust, UL-recognized overvoltage protection in harsh-environment power and interface circuits.
FAQ
What is the working peak reverse voltage (VRWM) of the P6SMB68CAT3?
The P6SMB68CAT3 has a working peak reverse voltage (VRWM) of 58.1 V. This value defines the maximum continuous DC or peak AC voltage the device can block without entering avalanche conduction. Engineers must ensure system operating voltage remains below this threshold to avoid premature clamping or leakage increase - for example, it is suitable for 48 V nominal bus systems with appropriate derating margin.
Does the P6SMB68CAT3 require polarity-aware PCB layout?
No, the P6SMB68CAT3 is a bidirectional TVS diode with symmetrical avalanche characteristics, so polarity marking is omitted per datasheet. Both terminals function identically under positive or negative transients - eliminating orientation constraints during placement and enabling simplified layout for AC-coupled or floating DC lines.
What is the clamping voltage of the P6SMB68CAT3 at its rated peak pulse current?
The P6SMB68CAT3 clamps to a maximum of 92 V at its rated peak pulse current of 6.5 A (10/1000 µs waveform). This clamping voltage represents the upper limit imposed on protected circuitry during surge events and must be verified against the absolute maximum ratings of downstream components such as MOSFETs or regulators to ensure safe operation.
Is the P6SMB68CAT3 certified for safety-critical protection applications?
Yes, the P6SMB68CAT3 carries UL 497B recognition (File #E210057) for isolated loop circuit protection. This certification validates performance across multiple safety tests including strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge - confirming suitability for telecom, industrial control, and medical equipment where regulatory compliance is mandatory.
How does thermal derating apply to the P6SMB68CAT3 in real-world PCB layouts?
The P6SMB68CAT3's 600 W rating assumes TL = 25°C with zero-lead-length measurement. In practice, thermal performance depends on copper pad area and ambient conditions: power must be linearly derated above 75°C lead temperature (40 mW/°C) or above 25°C ambient (4.4 mW/°C). Use ON Semiconductor's recommended 1″ square FR-4 pad (Case 403A footprint) to achieve specified RJL = 40 °C/W.
P6SMB68CAT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-214AA, SMB
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 58.1V
- Voltage - Breakdown (Min):
- 64.6V
- Voltage - Clamping (Max) @ Ipp:
- 92V
- Current - Peak Pulse (10/1000µs):
- 6.5A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 155pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
P6SMB68CAT3 FAQ
1.How can I place an order for P6SMB68CAT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for P6SMB68CAT3 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 P6SMB68CAT3 reliable?
The price and inventory of P6SMB68CAT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P6SMB68CAT3 is usually 5 days.
3.What payment methods are accepted for P6SMB68CAT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P6SMB68CAT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P6SMB68CAT3?
P6SMB68CAT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P6SMB68CAT3 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 P6SMB68CAT3?
For technical support, including P6SMB68CAT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P6SMB68CAT3 requirements.
6.How does Aetrix verify that P6SMB68CAT3 is sourced from the original manufacturer or authorized distributors?
All P6SMB68CAT3 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 P6SMB68CAT3 meets industry standards.
7.What is the process for return or replacement of P6SMB68CAT3?
All P6SMB68CAT3 units undergo pre-shipment inspection (PSI). If there is an issue with P6SMB68CAT3, 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 P6SMB68CAT3 part is unused and in its original packaging.
Return procedure for P6SMB68CAT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P6SMB68CAT3 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…
