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Vishay General Semiconductor - Diodes Division SA8.5A-E3/54
- Part No.:
- SA8.5A-E3/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA8.5A-E3/54.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,407
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Product details
Overview
SA8.5A-E3/54 from Vishay General Semiconductor is a unidirectional Transient Voltage Suppressor (TVS) diode in DO-15 package, designed for overvoltage protection of sensitive electronics. It features 8.5 V stand-off voltage (VWM), 9.44–10.4 V breakdown voltage (VBR) at 1 mA, 14.4 V clamping voltage (VC) at 10 A peak pulse current, and 500 W peak pulse power rating with 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor signal lines in industrial and automotive power supply rails.
For engineers reviewing the SA8.5A-E3/54 datasheet, SA8.5A-E3/54 pinout, SA8.5A-E3/54 application, or SA8.5A-E3/54 equivalent, key selection criteria include unidirectional polarity, DO-15 mechanical compatibility, 175 °C max junction temperature, AEC-Q101 qualification status (E3 suffix indicates commercial grade; HE3 required for automotive), and clamping performance under repetitive surge conditions.
Technical Context
The SA8.5A-E3/54 operates as a silicon avalanche diode with glass-passivated junction, delivering fast response (<1 ns) to transient overvoltages. Its unidirectional configuration enables integration into DC power rails where polarity is fixed, and its low incremental surge resistance ensures stable clamping during high-current transients up to 10 A.
It complies with IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and ISO 7637-2 (automotive load dump) immunity standards when applied with appropriate layout practices. The device is rated for 70 A non-repetitive forward surge current (IFSM) and exhibits a +8 mV/°C temperature coefficient of VBR, enabling predictable voltage drift across operating temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - maximum continuous reverse working voltage before clamping begins; sets upper limit for normal DC rail operation. |
| VBR @ IT = 1 mA | 9.44–10.4 V - guaranteed avalanche onset range; defines minimum overvoltage threshold for reliable triggering. |
| VC @ IPPM = 10 A | 14.4 V - clamped voltage during 10 A 10/1000 µs surge; determines maximum stress imposed on protected downstream circuitry. |
| PPPM | 500 W - peak pulse power handling capability; supports robust protection against lightning-induced surges and inductive switching spikes. |
| IFSM | 70 A - single half-sine surge current rating (10 ms); validates suitability for automotive load-dump events per ISO 7637-2. |
| TJ max | 175 °C - maximum junction temperature; enables operation in under-hood or industrial environments without thermal derating below full power. |
| Package | DO-15 (DO-204AC) - axial-leaded through-hole package with 0.130–0.138 inch diameter body; compatible with standard wave-soldering and manual assembly processes. |
Pinout & Package
DO-15 (DO-204AC) package with axial leads: cathode indicated by color band; anode is unmarked lead. Molded epoxy case meets UL 94 V-0 flammability rating; matte tin-plated leads comply with J-STD-002 solderability and JESD 201 Class 1A whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded lead) | Current entry point in forward bias; connected to ground or low-side return path in TVS configuration. | Provides low-impedance path to shunt surge current to reference plane during overvoltage event. |
| Cathode (banded lead) | Current exit point in forward bias; connected to protected line (e.g., VCC, signal line). | Enables unidirectional clamping action - conducts only when protected node exceeds VWM + VF relative to ground. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated chip junction | Ensures stable avalanche characteristics and long-term reliability under repeated surge stress without parameter drift. |
| 500 W peak pulse power (10/1000 µs) | Supports protection against severe transients including ISO 7637-2 Pulse 5a (load dump) in 12 V systems. |
| AEC-Q101 qualified variant available (HE3 suffix) | Confirms suitability for automotive applications requiring validated reliability and process control - E3 version is commercial grade. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage overshoot during clamping, reducing risk of damage to downstream logic-level ICs and MOSFET gate oxides. |
| Solder dip rated 275 °C for 10 s | Enables compatibility with lead-free reflow and selective wave soldering profiles without delamination or junction degradation. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump transients (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and chassis ground to clamp surges above 13.5 V. Use Value: Limits peak voltage seen by downstream DC-DC converters and microcontrollers to ≤14.4 V, preventing latch-up or permanent damage. | Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) from ESD and cable discharge events in factory automation. IC Role / Device Role / Timing Role: TVS mounted at connector interface to divert fast transients before reaching precision ADC or op-amp input stages. Use Value: Clamps 8 kV contact ESD (IEC 61000-4-2) within <1 ns, preserving signal integrity and avoiding offset shifts in measurement circuits. |
| Consumer Power Adapter Input Stage | Telecom DC Feeder Protection |
Use Scenario: Safeguarding AC-DC adapter primary-side rectifier and secondary-side 5 V/3.3 V rails against surge coupling from mains or USB port hot-plug events. IC Role / Device Role / Timing Role: Unidirectional TVS on low-voltage DC output to suppress reverse-polarity misconnection and inductive kickback from connected peripherals. Use Value: Withstands 70 A IFSM, enabling robustness against accidental 12 V reverse connection without fuse blow or diode failure. | Use Scenario: Protecting -48 V telecom power feeds from lightning-induced longitudinal surges entering via outdoor copper pairs. IC Role / Device Role / Timing Role: TVS deployed in series with feed-line choke to clamp common-mode transients while maintaining DC continuity. Use Value: 500 W PPPM rating sustains multiple 10/1000 µs surges up to 10 A without degradation, meeting Telcordia GR-1089-CORE 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 |
|---|---|---|---|
| SMAJ8.5A | Same VWM (8.5 V), identical DO-214AC (SMA) package; slightly higher VC (14.4 V vs. 14.4 V - matched), but lower IPPM rating (10.3 A vs. 10 A). | Surface-mount alternative for space-constrained PCBs; lacks axial lead mechanical robustness for high-vibration environments. | Select SMAJ8.5A when board real estate is limited and automated SMT assembly is preferred; retain SA8.5A-E3/54 for through-hole reliability in harsh environments. |
| 1.5KE8.5A | Higher PPPM (1500 W), larger DO-201AD package; same VWM and VBR range, but significantly higher VC (15.5 V) and lower thermal resistance. | Used where higher surge margin is needed (e.g., outdoor telecom cabinets), but requires larger footprint and higher mounting torque. | Choose 1.5KE8.5A only if system-level testing confirms need for >500 W surge handling; otherwise SA8.5A-E3/54 offers optimal balance of size, cost, and performance. |
Compared with SMAJ8.5A and 1.5KE8.5A, the SA8.5A-E3/54 delivers identical clamping performance in a mechanically rugged DO-15 through-hole package optimized for manual assembly, vibration resistance, and thermal cycling stability - making it preferred for industrial controls and automotive under-hood modules where reliability trumps miniaturization.
Availability
SA8.5A-E3/54 is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and telecom DC feeder surge suppression requiring stable component supply across extended production lifecycles.
Supply support for SA8.5A-E3/54 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 SAxxA series belongs to Vishay's TRANSZORB® TVS family, engineered specifically for robust transient suppression in automotive, industrial, and telecom infrastructure - balancing low clamping voltage, high surge capacity, and AEC-Q101 compliance readiness.
FAQ
What is the maximum clamping voltage of the SA8.5A-E3/54 under a 10 A 10/1000 µs surge?
The SA8.5A-E3/54 has a maximum clamping voltage (VC) of 14.4 V when subjected to a 10 A peak pulse current with a 10/1000 µs waveform. This value is measured per Figure 7 in the Vishay datasheet 88378 and represents the upper limit of voltage imposed on protected circuitry during standardized surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is the SA8.5A-E3/54 AEC-Q101 qualified?
No, the SA8.5A-E3/54 is not AEC-Q101 qualified. The "E3" suffix denotes RoHS-compliant commercial-grade construction. For automotive applications requiring AEC-Q101 qualification, the SA8.5AHE3/54 variant must be selected - it shares identical electrical specifications but undergoes additional stress testing and process controls per AEC-Q101 Rev D.
What is the standoff voltage (VWM) and why is it important for SA8.5A-E3/54 placement?
The SA8.5A-E3/54 has a standoff voltage (VWM) of 8.5 V, meaning it remains non-conductive up to this reverse voltage level. This parameter dictates safe placement on DC rails - for example, it can protect a nominal 5 V or 8 V supply but must not be used on a 12 V rail without series impedance, as continuous operation above VWM causes leakage and thermal runaway.
How does the SA8.5A-E3/54 differ from bidirectional variants like SA8.5CA?
The SA8.5A-E3/54 is unidirectional and features a cathode band for polarity-sensitive placement, whereas SA8.5CA is bidirectional with no polarity marking and symmetric clamping in both directions. SA8.5A-E3/54 is suited for DC power lines with defined ground reference; SA8.5CA is used in AC-coupled or floating signal paths such as RS-485 or audio lines where voltage polarity reverses.
What is the junction temperature range and how does it affect SA8.5A-E3/54 lifetime in high-ambient environments?
The SA8.5A-E3/54 operates from –55 °C to +175 °C junction temperature. At ambient temperatures exceeding 75 °C, derating per Figure 2 applies: power dissipation drops linearly to zero at 175 °C. In high-ambient applications like engine control units, thermal design must ensure junction temperature stays below 150 °C during surge events to maintain clamping consistency and avoid parametric shift over time.
SA8.5A-E3/54 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AC (DO-15)
SA8.5A-E3/54 FAQ
1.How can I place an order for SA8.5A-E3/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA8.5A-E3/54 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 SA8.5A-E3/54 reliable?
The price and inventory of SA8.5A-E3/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA8.5A-E3/54 is usually 5 days.
3.What payment methods are accepted for SA8.5A-E3/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA8.5A-E3/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA8.5A-E3/54?
SA8.5A-E3/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA8.5A-E3/54 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 SA8.5A-E3/54?
For technical support, including SA8.5A-E3/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA8.5A-E3/54 requirements.
6.How does Aetrix verify that SA8.5A-E3/54 is sourced from the original manufacturer or authorized distributors?
All SA8.5A-E3/54 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 SA8.5A-E3/54 meets industry standards.
7.What is the process for return or replacement of SA8.5A-E3/54?
All SA8.5A-E3/54 units undergo pre-shipment inspection (PSI). If there is an issue with SA8.5A-E3/54, 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 SA8.5A-E3/54 part is unused and in its original packaging.
Return procedure for SA8.5A-E3/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA8.5A-E3/54 Tags
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