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Vishay Semiconductor Opto Division VOL628A-3T
- Part No.:
- VOL628A-3T
- Manufacturer:
- Vishay Semiconductor Opto Division
- Package:
- 4-SMD, Gull Wing
- Datasheet:
-
VOL628A-3T.pdf
- Description:
- OPTOISOLATOR 5KV TRANS LSOP-4
- Quantity:
- Payment:
- Shipping:
Inventory:3,832
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Product details
Overview
VOL628A-3T from Vishay Semiconductors is a dual GaAs infrared LED coupled to a silicon planar phototransistor in a 4-pin LSOP mini-flat package, delivering CTR of 100–200 % at ±1 mA input, VCEO = 80 V, and 5000 VRMS isolation voltage - used for AC line monitoring and isolated feedback in industrial power supplies.
For engineers reviewing the VOL628A-3T datasheet, VOL628A-3T pinout, VOL628A-3T application, or VOL628A-3T equivalent, this optocoupler supports low-input-current signal isolation with high common-mode transient immunity (CMTI), long creepage (>8 mm), and VDE-certified safety compliance under DIN EN 60747-5-5 option 1.
Technical Context
The VOL628A-3T implements an AC-input, phototransistor-output optocoupler architecture with two back-to-back GaAs IR LEDs enabling bidirectional input detection without external polarity conditioning. Its planar phototransistor output provides saturated switching with VCE(sat) ≤ 0.4 V at IC = 0.5 mA and IF = ±1 mA.
Isolation performance meets UL1577 (5000 VRMS/1 min) and DIN EN 60747-5-5 (VIORM = 1050 Vpeak, VIOTM = 8000 Vpeak) with CTI ≥ 275 and pollution degree 2. Creepage and clearance both exceed 8 mm, supporting reinforced insulation in mains-connected equipment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CTR (IF = ±1 mA, VCE = 5 V) | 100–200 % - ensures reliable transistor saturation with low drive current, reducing MCU GPIO load in PLC I/O modules |
| VCEO | 80 V - supports direct interface with 24 V DC control rails and 48 V telecom systems without external clamping |
| Isolation Voltage | 5000 VRMS - certified for reinforced insulation per UL/cUL/BSI/FIMKO/CQC, enabling use across primary-secondary boundaries in AC/DC SMPS |
| VCE(sat) | ≤ 0.4 V at IC = 0.5 mA - minimizes power loss and self-heating in high-duty-cycle feedback paths |
| Switching Speed | ton = 6 μs, toff = 5.5 μs - sufficient for 50/60 Hz AC zero-crossing detection and <100 kHz PWM feedback loops |
| Coupling Capacitance | 0.25 pF - limits noise coupling across isolation barrier, critical for EMI-sensitive motor drives and medical power supplies |
| Ambient Temp Range | −55 °C to +110 °C - qualified for under-hood automotive auxiliary supplies and industrial outdoor enclosures |
Pinout & Package
Package: LSOP-4 (Long Creepage Mini-Flat), surface-mount, 8.20 mm × 10.80 mm footprint, 0.70 mm nominal height, 2.54 mm pin pitch, creepage ≥ 8 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode of LED 1 | Accepts positive half-cycle of AC input; paired with Pin 2 for bidirectional conduction |
| 2 | Cathode of LED 1 / Anode of LED 2 | Common terminal enabling AC operation - connects to AC source midpoint or bridge rectifier output |
| 3 | Emitter | Phototransistor emitter reference; tied to secondary-side ground or pull-down resistor |
| 4 | Collector | Active-low output node; sinks up to 50 mA, compatible with TTL/CMOS logic inputs and microcontroller interrupts |
Key Features
| Feature | Design Value |
|---|---|
| Dual back-to-back GaAs LEDs | Enables true AC input operation without external diode bridge - reduces BOM count and PCB area in AC sensing circuits |
| High CMTI (>15 kV/μs typical) | Suppresses false triggering during fast transients in motor inverters and switch-mode power supply gate drivers |
| Low coupling capacitance (0.25 pF) | Maintains signal integrity across isolation barrier in high-frequency feedback loops (e.g., LLC resonant converters) |
| VDE-certified option (DIN EN 60747-5-5) | Validates reinforced insulation for medical and industrial safety-critical applications requiring certification audit traceability |
| Extended temperature range (−55 °C to +110 °C) | Supports deployment in unheated outdoor cabinets, railway traction converters, and oil-field power electronics |
Applications
| AC Line Monitoring | Industrial PLC Input Modules |
|---|---|
|
Use Scenario: Detecting presence and zero-crossing of 120/230 VAC mains in energy meters and smart breakers. IC Role / Device Role / Timing Role: AC-input optocoupler providing galvanic isolation and level-shifting between live AC lines and low-voltage MCU logic. Use Value: Eliminates need for external bridge rectifier and bias resistors; CTR stability over temperature ensures consistent zero-crossing timing accuracy across −40 °C to +85 °C. |
Use Scenario: Isolating 24 VDC digital inputs from field sensors (limit switches, photoelectric sensors) in factory automation. IC Role / Device Role / Timing Role: Input-stage signal isolator converting field-side voltage presence into clean, noise-immune logic-level signals for FPGA or ARM-based controllers. Use Value: High CMTI and 8 mm creepage prevent misreads during ESD events or relay coil flyback; VCEO = 80 V tolerates 24 V surges without clamping. |
| Isolated Feedback in SMPS | Battery Management System (BMS) Cell Monitoring |
|
Use Scenario: Providing secondary-side error amplifier output to primary-side PWM controller in offline flyback or forward converters. IC Role / Device Role / Timing Role: Linear-mode phototransistor coupler transmitting analog feedback voltage across isolation barrier with minimal phase shift. Use Value: Low VCE(sat) and stable CTR enable precise regulation within ±1 % over line/load/temperature; 0.25 pF coupling capacitance preserves loop stability. |
Use Scenario: Isolating cell voltage measurements from high-voltage battery stacks (e.g., 400–800 V EV packs) to low-voltage monitor ICs. IC Role / Device Role / Timing Role: High-isolation voltage interface for periodic cell sampling, ensuring safe communication between HV domain and MCU domain. Use Value: 5000 VRMS isolation and reinforced insulation rating meet IEC 61000-4-5 surge requirements for BMS; long creepage prevents arcing in humid environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar optocoupler applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLP281-4(GB-TP,F) | Single LED, CTR 50–600 %, no VDE option, 3750 VRMS isolation, SOIC-4 package | Lacks AC-input capability and VDE certification; suitable only for DC-coupled logic isolation | Select when cost sensitivity outweighs AC input need and safety certification is not required |
| PC817XNIP0XK | Single LED, CTR 80–160 %, 5000 VRMS, DIP-4, no VDE option, higher VCE(sat) (0.4 V typ) | Through-hole only; lacks long creepage and AC input; lower CMTI | Choose for legacy through-hole designs where board rework is prohibitive and AC input is not needed |
Compared with TLP281-4 and PC817XNIP0XK, the VOL628A-3T uniquely combines AC-input operation, VDE-certified reinforced insulation, and long creepage in a surface-mount LSOP package - making it the only option among the three qualified for certified AC line monitoring and high-reliability industrial feedback.
Availability
VOL628A-3T is available at Aetrix Electronics and suitable for industrial controls, AC line monitors, and isolated feedback circuits requiring stable component supply, full safety certification traceability, and long-term production continuity.
Supply support for VOL628A-3T 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 Intertechnology is a global semiconductor manufacturer specializing in discrete components, optoelectronics, and passive devices, with emphasis on reliability, precision, and high-voltage performance.
The VOL628A-3T belongs to Vishay's high-isolation AC-input optocoupler product line, engineered specifically for safety-critical signal transmission in industrial power conversion, grid infrastructure, and automated machinery.
FAQ
What is the key functional distinction of VOL628A-3T versus standard DC-input optocouplers?
The VOL628A-3T integrates two anti-parallel GaAs infrared LEDs, enabling direct AC input operation without external bridge rectification. This allows single-component zero-crossing detection and bidirectional signal transmission - unlike DC-input optocouplers such as PC817 or TLP281 that require polarity conditioning. The VOL628A-3T maintains full CTR specification and isolation integrity across both AC half-cycles.
Does VOL628A-3T support VDE certification, and what does "option 1" mean in its ordering code?
Yes, VOL628A-3T is certified to DIN EN 60747-5-5 (VDE 0884-5) under "option 1", which confirms compliance with reinforced insulation requirements including partial discharge testing (VPR = 2000 Vpeak), transient voltage ratings (VIOTM = 8000 Vpeak), and insulation thickness (DTI ≥ 0.4 mm). The "-3T" suffix indicates CTR bin 100–200 % and tape-and-reel packaging; "X001" in alternate variants denotes VDE option 1 marking.
What is the maximum continuous collector current rating for VOL628A-3T, and how does it relate to thermal derating?
The VOL628A-3T supports IC = 50 mA continuously at Tamb ≤ 25 °C, derating linearly to 0 mA at Tamb = 110 °C per Fig. 1 in the datasheet. At 85 °C ambient, max IC is ~32 mA. This derating applies to the phototransistor output stage only; total device power dissipation must remain ≤ 250 mW. The VOL628A-3T's low VCE(sat) (≤0.4 V) helps minimize self-heating under load.
Can VOL628A-3T be used in linear analog feedback applications, or is it limited to digital switching?
The VOL628A-3T is specified and characterized for both modes: saturated switching (e.g., ON/OFF signaling) and linear analog operation (e.g., error amplifier feedback). Its CTR stability (±20 % over −40 °C to +85 °C) and low nonlinearity (<5 % typical) support analog use, though design must account for CTR variance across production lots. For precision analog, Vishay recommends verifying loop gain margin with worst-case CTR bounds in the VOL628A-3T's 100–200 % bin.
What are the creepage and clearance distances of VOL628A-3T, and why do they matter for safety compliance?
VOL628A-3T guarantees minimum creepage and clearance distances of ≥8 mm, verified per IEC 60664-1 and DIN EN 60747-5-5. These dimensions prevent surface tracking and air breakdown under high-voltage stress, directly enabling reinforced insulation classification. In AC mains-connected equipment, ≥8 mm spacing satisfies basic and reinforced insulation requirements for working voltages up to 300 VRMS, eliminating need for slotting or conformal coating.
VOL628A-3T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Semiconductor Opto Division
- Series:
- -
- Package/Case:
- 4-SMD, Gull Wing
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Channels:
- 1
- Voltage - Isolation:
- 5000Vrms
- Current Transfer Ratio (Min):
- 100% @ 1mA
- Current Transfer Ratio (Max):
- 200% @ 1mA
- Turn On / Turn Off Time (Typ):
- 6µs, 5.5µs
- Rise / Fall Time (Typ):
- 3.5µs, 5µs
- Input Type:
- AC, DC
- Output Type:
- Transistor
- Voltage - Output (Max):
- 80V
- Current - Output / Channel:
- 50mA
- Voltage - Forward (Vf) (Typ):
- 1.16V
- Current - DC Forward (If) (Max):
- 60 mA
- Vce Saturation (Max):
- 400mV
- Grade:
- -
- Qualification:
- -
- Operating Temperature:
- -55°C ~ 110°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 4-SOP
VOL628A-3T FAQ
1.How can I place an order for VOL628A-3T through Aetrix?
Please submit a Request for Quotation (RFQ) for VOL628A-3T 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 VOL628A-3T reliable?
The price and inventory of VOL628A-3T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VOL628A-3T is usually 5 days.
3.What payment methods are accepted for VOL628A-3T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VOL628A-3T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VOL628A-3T?
VOL628A-3T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VOL628A-3T 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 VOL628A-3T?
For technical support, including VOL628A-3T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VOL628A-3T requirements.
6.How does Aetrix verify that VOL628A-3T is sourced from the original manufacturer or authorized distributors?
All VOL628A-3T 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 VOL628A-3T meets industry standards.
7.What is the process for return or replacement of VOL628A-3T?
All VOL628A-3T units undergo pre-shipment inspection (PSI). If there is an issue with VOL628A-3T, 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 VOL628A-3T part is unused and in its original packaging.
Return procedure for VOL628A-3T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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