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Vishay General Semiconductor - Diodes Division P6SMB91CA-E3/52
- Part No.:
- P6SMB91CA-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
P6SMB91CA-E3/52.pdf
- Description:
- TVS DIODE 77.8VWM 125VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:439
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Product details
Overview
P6SMB91CA-E3/52 from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on signal and power lines. It features a 77.8 V standoff voltage (VWM), 86.5–95.5 V breakdown voltage (VBR) at 1 mA, 125 V maximum clamping voltage (VC) at 4.8 A peak pulse current, and 600 W peak pulse power rating with 10/1000 μs waveform - used to protect MOSFETs, sensor interfaces, and telecom line drivers against ESD and inductive switching surges.
For engineers reviewing the P6SMB91CA-E3/52 datasheet, P6SMB91CA-E3/52 pinout, P6SMB91CA-E3/52 application, or P6SMB91CA-E3/52 equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VBR ≈ 1.33), RoHS-compliant matte tin terminations, MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, delivering identical clamping performance in forward and reverse directions. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1 μA at VWM), while the low incremental surge resistance enables effective energy diversion during fast transients.
The device is rated for repetitive 10/1000 μs pulses at 0.01% duty cycle and supports peak surge currents up to 4.8 A. Thermal resistance is 100 °C/W (junction-to-ambient, typical) and 20 °C/W (junction-to-lead), enabling reliable operation up to 150 °C junction temperature without heatsinking under defined PCB pad conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 77.8 V - Maximum continuous reverse operating voltage before significant conduction begins; defines safe working margin below clamping threshold. |
| VBR @ IT = 1 mA | 86.5–95.5 V - Breakdown voltage range at test current; determines precise clamping onset and ensures tight tolerance for system-level overvoltage protection. |
| VC @ IPPM = 4.8 A | 125 V - Maximum clamped voltage during 10/1000 μs transient; directly limits stress on downstream ICs such as RS-485 transceivers or microcontroller I/O. |
| PPPM | 600 W - Peak pulse power handling capacity; enables robust suppression of lightning-induced surges and relay coil flyback energy in industrial controls. |
| IPPM | 4.8 A - Peak pulse current supported at VC; correlates with transient energy absorption (≈ 0.24 J for 10/1000 μs waveform). |
| TJ max. | +150 °C - Maximum junction temperature; allows operation in under-hood automotive or high-ambient industrial environments when mounted per recommended pad layout. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 0.220" × 0.130" footprint; compatible with JEDEC-standard reflow profiles and automated pick-and-place equipment. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, UL 94 V-0 flammability rating, and no polarity marking for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional terminal pair | No functional polarity distinction; either terminal serves as anode or cathode depending on transient polarity - enables single-device protection of AC-coupled or differential lines. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Supports IEC 61000-4-5 Level 4 surge immunity (4 kV line-to-ground) in properly designed front-end circuits. |
| Low clamping ratio (VC/VBR ≈ 1.33) | Minimizes voltage overshoot during clamping, reducing risk of latch-up or gate oxide damage in protected MOSFETs and logic devices. |
| MSL Level 1 (260 °C peak reflow) | Enables standard lead-free reflow assembly without pre-baking; eliminates moisture-related popcorning failures during manufacturing. |
| Glass passivated junction | Ensures long-term stability of VBR and leakage current over temperature and lifetime, critical for automotive and industrial field reliability. |
| RoHS-compliant, matte tin terminations | Guarantees solderability per J-STD-002 and JESD 22-B102, with whisker resistance per JESD 201 Class 2 for high-reliability applications. |
Applications
| Industrial Motor Drives | Automotive Sensor Interfaces |
|---|---|
|
Use Scenario: Protection of gate drivers and feedback signal lines against flyback voltage spikes from contactor switching and PWM motor control. IC Role / Device Role / Timing Role: Bidirectional clamping element placed across isolated signal inputs and low-side driver outputs to limit transient excursions to <125 V. Use Value: Prevents false triggering and latch-up in isolated gate drivers (e.g., Si823x) and analog front-ends by maintaining signal integrity during 100 A inductive turn-off events. |
Use Scenario: ESD and load-dump protection for LIN bus transceivers and pressure/temperature sensor signal conditioning circuits in engine control modules. IC Role / Device Role / Timing Role: Primary transient suppressor on bidirectional LIN data line and analog sensor supply rails, operating symmetrically during ±15 kV HBM ESD events. Use Value: Maintains communication continuity during ISO 10605 testing and prevents permanent damage to ASIC sensor interfaces rated for only 30 V absolute maximum input. |
| Telecom Line Cards | Consumer Power Adapters |
|
Use Scenario: Surge protection on RJ-45 Ethernet PHY interface lines exposed to induced lightning surges in outdoor DSLAM installations. IC Role / Device Role / Timing Role: Secondary-level TVS placed after common-mode chokes to clamp differential-mode transients exceeding 100 V on MDI/MDIX pairs. Use Value: Limits clamped voltage to 125 V, ensuring compliance with IEEE 802.3af PoE+ surge requirements while preserving PHY IC integrity (e.g., DP83867IR). |
Use Scenario: Input-stage transient suppression on secondary-side 12 V DC output rails of USB-C PD adapters subject to hot-plug and cable discharge events. IC Role / Device Role / Timing Role: Bidirectional clamp between VOUT and GND to absorb 8 kV contact ESD and 15 kV air-gap discharges per IEC 61000-4-2. Use Value: Eliminates need for separate unidirectional TVS on each rail side, reducing BOM count and PCB area while meeting UL 62368-1 transient immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ90CA | Same SMB package, 90 V nominal breakdown (85.5–94.5 V), 124 V clamping at 4.8 A; slightly tighter VBR tolerance but identical power rating. | Preferred where tighter VBR spec is required for margin-critical 75 V systems; otherwise functionally interchangeable in most designs. | Select SMBJ90CA if VBR center-point alignment with 75 V rail is prioritized over legacy P6SMB-series qualification history. |
| 1.5SMC91CA | Higher-power 1500 W variant in larger SMC (DO-214AB) package; same 77.8 V VWM, 86.5–95.5 V VBR, but 125 V VC at 12 A - not pin-compatible. | Suitable for higher-energy threat environments (e.g., AC mains input stages); requires PCB redesign due to 3.5 mm × 7.0 mm footprint vs. SMB's 3.3 mm × 4.6 mm. | Choose 1.5SMC91CA only when surge energy exceeds 600 W capability and board space permits larger package. |
Compared with SMBJ90CA, P6SMB91CA-E3/52 offers broader VBR tolerance and longer field reliability track record in automotive-grade variants; compared with 1.5SMC91CA, it delivers identical clamping performance in half the footprint - making it optimal for space-constrained DC-fed subsystems requiring certified 600 W surge handling.
Availability
P6SMB91CA-E3/52 is available at Aetrix Electronics and suitable for industrial motor drives, automotive sensor interfaces, telecom line cards, and consumer power adapters requiring stable component supply, RoHS compliance, and AEC-Q101-qualified alternatives.
Supply support for P6SMB91CA-E3/52 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The P6SMB Series was developed for cost-effective, high-volume transient protection in space-constrained SMT applications - targeting consumer, industrial, and automotive electronics where standardized SMB packaging and repeatable clamping performance are essential.
FAQ
What is the clamping voltage of P6SMB91CA-E3/52 at its rated peak pulse current?
The P6SMB91CA-E3/52 has a maximum clamping voltage (VC) of 125 V at its rated peak pulse current (IPPM) of 4.8 A, measured using the standard 10/1000 μs double-exponential waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during transient events. The P6SMB91CA-E3/52 maintains this clamping performance bidirectionally, making it suitable for AC-coupled and differential signal paths.
Is P6SMB91CA-E3/52 suitable for automotive applications?
Yes - the base P6SMB91CA-E3/52 is RoHS-compliant and commercial-grade, but Vishay offers AEC-Q101-qualified versions under ordering codes such as P6SMB91CAHE3_B/H. These qualified variants undergo stress testing per automotive reliability standards and are marked with "HE3" or "HM3" suffixes. The P6SMB91CA-E3/52 itself is commonly used in non-safety-critical automotive subsystems like infotainment and body electronics where full AEC-Q101 certification is not mandated.
What does the "CA" suffix indicate in P6SMB91CA-E3/52?
The "CA" suffix in P6SMB91CA-E3/52 denotes a bidirectional configuration - meaning the device provides symmetrical transient suppression in both forward and reverse directions. Unlike unidirectional "A" variants (e.g., P6SMB91A), the CA version has no cathode band marking and functions identically regardless of voltage polarity applied across its terminals. This makes the P6SMB91CA-E3/52 ideal for protecting AC signals, differential buses, and floating grounds.
How does the thermal performance of P6SMB91CA-E3/52 depend on PCB layout?
The P6SMB91CA-E3/52 achieves its specified thermal resistance (RθJA = 100 °C/W) only when mounted on minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. Reducing pad size increases junction temperature rise during surge events and may cause premature failure. For continuous power dissipation >500 mW, additional copper pour or thermal vias are advised. The P6SMB91CA-E3/52's RθJL = 20 °C/W enables efficient heat transfer to PCB traces when lead-to-copper contact is optimized.
Can P6SMB91CA-E3/52 be used in place of a unidirectional TVS like P6SMB91A?
No - the P6SMB91CA-E3/52 is strictly bidirectional and lacks polarity marking, whereas P6SMB91A is unidirectional with a cathode band. Substituting P6SMB91CA-E3/52 for P6SMB91A in DC-biased circuits may allow unintended conduction during normal operation, especially if reverse bias exceeds VWM. However, P6SMB91CA-E3/52 can replace P6SMB91A in AC-coupled or differential applications where symmetry is required - always verify system-level bias conditions before substitution.
P6SMB91CA-E3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- P6SMB, TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 77.8V
- Voltage - Breakdown (Min):
- 86.5V
- Voltage - Clamping (Max) @ Ipp:
- 125V
- Current - Peak Pulse (10/1000µs):
- 4.8A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
P6SMB91CA-E3/52 FAQ
1.How can I place an order for P6SMB91CA-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for P6SMB91CA-E3/52 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 P6SMB91CA-E3/52 reliable?
The price and inventory of P6SMB91CA-E3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P6SMB91CA-E3/52 is usually 5 days.
3.What payment methods are accepted for P6SMB91CA-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P6SMB91CA-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P6SMB91CA-E3/52?
P6SMB91CA-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P6SMB91CA-E3/52 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 P6SMB91CA-E3/52?
For technical support, including P6SMB91CA-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P6SMB91CA-E3/52 requirements.
6.How does Aetrix verify that P6SMB91CA-E3/52 is sourced from the original manufacturer or authorized distributors?
All P6SMB91CA-E3/52 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 P6SMB91CA-E3/52 meets industry standards.
7.What is the process for return or replacement of P6SMB91CA-E3/52?
All P6SMB91CA-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with P6SMB91CA-E3/52, 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 P6SMB91CA-E3/52 part is unused and in its original packaging.
Return procedure for P6SMB91CA-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P6SMB91CA-E3/52 Tags
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