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onsemi SA8V5A
- Part No.:
- SA8V5A
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA8V5A.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO15
- Quantity:
- Payment:
- Shipping:
Inventory:9,800
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Product details
Overview
SA8V5A from Fairchild Semiconductor is a unidirectional 500 W transient voltage suppressor (TVS) diode in DO-15 package, with 8.5 V reverse stand-off voltage (VRWM), 9.44–10.4 V breakdown voltage (VBR), 14.4 V clamping voltage at peak pulse current, and <10 µA reverse leakage at VRWM. It protects DC power rails and I/O lines in industrial control systems against ESD and lightning-induced surges.
For engineers reviewing the SA8V5A datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, DO-15 terminal mapping, bidirectional variant context (SA8V5CA), clamping performance under 10/1000 µs waveform, and real-world surge protection use cases for embedded power interfaces.
Technical Context
The SA8V5A operates as a unidirectional avalanche diode with glass-passivated junction, optimized for fast response (<1.0 ps from 0 V to BV) and low incremental surge resistance. Its clamping behavior is defined by a 10/1000 µs double-exponential surge waveform per R.E.A., delivering 54.3 A peak pulse current at 14.4 V.
It is rated for 175 °C maximum junction temperature and 1.0 W steady-state power dissipation at 75 °C ambient with 0.375" lead length. Reverse leakage remains below 10 µA above 10 V, supporting low-power standby circuits without excessive quiescent loss.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 µs) | 500 W - sustains single high-energy transients without failure in telecom or automotive load-dump scenarios |
| Reverse Stand-off Voltage (VRWM) | 8.5 V - defines maximum continuous DC operating voltage before significant leakage begins |
| Breakdown Voltage (VBR) | 9.44–10.4 V @ 1.0 mA - ensures reliable avalanche initiation within tight tolerance for predictable clamping onset |
| Clamping Voltage (VC) | 14.4 V @ IPPM - limits downstream IC voltage stress during 54.3 A surge, enabling robust 12 V system protection |
| Reverse Leakage (IR) | <10 µA @ VRWM - minimizes standby power loss in battery-backed or energy-sensitive applications |
| Junction Temperature (TJ) | +175 °C - supports operation in under-hood automotive or industrial enclosures without thermal derating |
| Package | DO-15 - industry-standard axial-leaded package with cathode band marking, compatible with through-hole assembly |
Pinout & Package
SA8V5A uses the DO-15 axial package with two terminals: anode and cathode. The cathode is marked by a color band on the body. No internal pin numbering applies-only polarity identification matters for correct series placement in DC rail protection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction; connected to protected line side | Must be tied to the circuit node requiring overvoltage clamping (e.g., +12 V rail input) |
| Cathode | Current exit point during avalanche clamping; connected to ground or lower-potential reference | Color-banded end; connects to system ground plane to shunt surge energy safely away from ICs |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable, repeatable avalanche characteristics and long-term reliability under repeated surge stress |
| 500 W peak pulse power (10/1000 µs) | Provides immunity to IEC 61000-4-5 Level 4 surges (4 kV line-to-ground) in 12 V systems |
| Fast response time <1.0 ps | Clamps before sensitive logic or analog circuitry experiences damaging overvoltage excursion |
| Low incremental surge resistance | Minimizes voltage overshoot during high di/dt events, improving clamping precision |
| Steady-state power rating: 1.0 W @ 75 °C | Supports continuous operation in thermally constrained environments without heatsinking |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module |
|---|---|
Use Scenario: Protecting 24 V digital input channels in programmable logic controllers from field-wiring induced surges and inductive kickback. IC Role / Device Role: Unidirectional TVS placed between input terminal and ground to clamp transients before reaching optocoupler or MCU GPIO. Use Value: Limits voltage to ≤14.4 V during 500 W surges, preventing damage to 3.3 V or 5 V logic-level interface ICs downstream. |
Use Scenario: Safeguarding LIN bus transceiver power supply pins in door module ECUs exposed to load dump and jump-start conditions. IC Role / Device Role: Primary rail clamp on 12 V supply line upstream of LDO regulator feeding the transceiver. Use Value: Withstands 54.3 A peak pulses while maintaining <10 µA leakage, preserving low-quiescent-current design goals. |
| DC Power Supply Input Stage | POS Terminal Serial Interface |
Use Scenario: Front-end protection for 12 V wall adapter inputs in point-of-sale terminals subjected to AC line transients and EFT bursts. IC Role / Device Role: First-line defense in series with fuse and parallel to bulk capacitor on primary DC input. Use Value: Clamps 10/1000 µs surges to 14.4 V, allowing downstream ceramic capacitors and regulators to operate within safe SOA limits. |
Use Scenario: Shielding RS-232 level-shifter ICs from ESD events during cable hot-plug in retail kiosks. IC Role / Device Role: Unidirectional TVS on VCC line feeding MAX232-type driver, referenced to local ground. Use Value: Fast <1.0 ps response ensures clamping initiates before ESD pulse couples into signal path, reducing bit errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ8.5A | Same DO-214AC package, identical VRWM (8.5 V), but higher VC = 15.0 V and lower IPPM = 49.3 A | Suitable for space-constrained PCBs where surface-mount is preferred; slightly higher clamping voltage reduces margin for 12 V rail protection | Select when board layout mandates SMD and 0.6 V higher clamping is acceptable for downstream IC SOA |
| Vishay SMA6J8.5A | DO-214AC package, VRWM = 8.5 V, VC = 14.4 V (identical), but rated for 600 W peak pulse power and 58.2 A IPPM | Better surge handling for repetitive or high-duty-cycle environments; same clamping performance enables drop-in validation in existing 12 V designs | Choose for enhanced ruggedness in automotive or outdoor equipment where surge repetition rate exceeds 4 pulses/minute |
Compared with SA8V5A, SMAJ8.5A trades clamping precision for SMD compatibility, while SMA6J8.5A extends surge endurance without altering clamping behavior-making it ideal for upgraded reliability in harsh environments.
Availability
SA8V5A is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control modules, and DC power supply input stages requiring stable component supply and consistent surge immunity performance across production batches.
Supply support for SA8V5A 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
Fairchild Semiconductor was a leading designer of high-performance analog and discrete semiconductors, acquired by ON Semiconductor in 2016; its legacy TVS portfolio remains widely deployed in industrial and automotive systems.
The SA5V0A–SA170A series was engineered specifically for cost-effective, high-energy transient suppression in DC power rails and signal lines, emphasizing fast response, stable clamping, and DO-15 manufacturability for global contract manufacturing.
FAQ
What is the clamping voltage of SA8V5A at its rated peak pulse current?
The SA8V5A has a maximum clamping voltage (VC) of 14.4 V when subjected to its peak pulse current (IPPM) of 54.3 A under the standard 10/1000 µs waveform. This value is measured per JEDEC test conditions and ensures predictable overvoltage limiting for downstream 12 V system components. The SA8V5A maintains this clamping performance across its full operating temperature range up to +175 °C junction temperature.
Is SA8V5A unidirectional or bidirectional, and how is polarity identified?
SA8V5A is a unidirectional transient voltage suppressor, meaning it conducts only in reverse bias during overvoltage events. Polarity is identified by a color band on the DO-15 package body, which marks the cathode terminal. The anode is the unmarked end. This configuration is intended for DC rail protection where surge direction is known and ground-referenced clamping is required. SA8V5A must not be substituted for bidirectional variants like SA8V5CA without circuit review.
What is the maximum steady-state power dissipation for SA8V5A?
The SA8V5A is rated for 1.0 W steady-state power dissipation at an ambient temperature of 75 °C with 0.375" lead length, per JEDEC standards. Derating is required above 75 °C, following the published pulse derating curve. This rating supports continuous operation in thermally managed industrial enclosures but does not reflect surge capability-its 500 W peak pulse rating applies only to short-duration transients.
How does SA8V5A compare to SA8V5CA in terms of electrical behavior?
SA8V5A is unidirectional, while SA8V5CA is its bidirectional counterpart. Both share identical VRWM (8.5 V), VBR (9.44–10.4 V), and VC (14.4 V) ratings, but SA8V5CA clamps symmetrically in both polarities-making it suitable for AC-coupled or floating signal lines like RS-485 or CAN bus. SA8V5A's reverse leakage is specified only in one direction; SA8V5CA's IR applies equally in both directions per datasheet Table 2.
Can SA8V5A be used in automotive 12 V systems subject to ISO 7637-2 pulse 5a (load dump)?
Yes, SA8V5A is suitable for basic load dump protection in 12 V automotive subsystems when used with appropriate series impedance (e.g., 1–5 Ω resistor or ferrite bead). Its 500 W peak pulse rating and 14.4 V clamping voltage provide margin against ISO 7637-2 Pulse 5a (up to 60 V, 400 ms), especially when combined with upstream fusing and downstream LDO regulation. For full compliance, verify system-level testing per vehicle manufacturer requirements.
SA8V5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 8.5V
- Voltage - Breakdown (Min):
- 9.44V
- Voltage - Clamping (Max) @ Ipp:
- 14.4V
- Current - Peak Pulse (10/1000µs):
- 34.7A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-15
SA8V5A FAQ
1.How can I place an order for SA8V5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SA8V5A 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 SA8V5A reliable?
The price and inventory of SA8V5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA8V5A is usually 5 days.
3.What payment methods are accepted for SA8V5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA8V5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA8V5A?
SA8V5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA8V5A 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 SA8V5A?
For technical support, including SA8V5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA8V5A requirements.
6.How does Aetrix verify that SA8V5A is sourced from the original manufacturer or authorized distributors?
All SA8V5A 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 SA8V5A meets industry standards.
7.What is the process for return or replacement of SA8V5A?
All SA8V5A units undergo pre-shipment inspection (PSI). If there is an issue with SA8V5A, 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 SA8V5A part is unused and in its original packaging.
Return procedure for SA8V5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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