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onsemi SA150A
- Part No.:
- SA150A
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA150A.pdf
- Description:
- TVS DIODE 150VWM 243VC DO15
- Quantity:
- Payment:
- Shipping:
Inventory:2,832
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Product details
Overview
SA150A from Fairchild Semiconductor is a unidirectional 500 W transient voltage suppressor (TVS) diode in DO-15 package, with 150 V reverse stand-off voltage (VRWM), 167–185 V breakdown voltage (VBR), and 243 V clamping voltage (VC) at 20.6 A peak pulse current (IPPM) on 10/1000 μs waveform - used for primary overvoltage protection in DC power rails and industrial I/O interfaces.
For engineers reviewing the SA150A datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, DO-15 terminal mapping, clamping performance under surge conditions, and validated alternative parts for ESD/surge protection design in 150 V systems.
Technical Context
The SA150A operates as a unidirectional avalanche diode, designed to clamp transient overvoltages above its breakdown threshold while maintaining low leakage (<1.0 μA at 150 V) and fast response (<1.0 ps from 0 V to VBR). Its glass-passivated junction ensures stable surge handling and long-term reliability under repetitive stress.
Rated for 500 W peak pulse power (10/1000 μs), it sustains 70 A non-repetitive forward surge current (IFSM) and operates up to +175 °C junction temperature, making it suitable for harsh-environment industrial and automotive power-line protection where thermal margin and clamping consistency are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 μs) | 500 W - supports high-energy transients like lightning-induced surges on 150 V DC lines without failure. |
| Reverse Stand-off Voltage (VRWM) | 150 V - maximum continuous operating voltage before clamping initiates; matches nominal 150 V supply rails. |
| Breakdown Voltage (VBR) | 167–185 V at 1.0 mA - defines precise avalanche onset range; ensures predictable turn-on margin above VRWM. |
| Clamping Voltage (VC) | 243 V at 20.6 A IPPM - limits downstream circuit voltage during surge, protecting 200–250 V-rated components. |
| Peak Pulse Current (IPPM) | 20.6 A on 10/1000 μs waveform - quantifies maximum surge current the device can safely divert. |
| Reverse Leakage (IR) | <1.0 μA at VRWM - negligible standby power loss and minimal interference in high-impedance sensing circuits. |
| Junction Temperature Range | −65 °C to +175 °C - enables deployment in extended-temperature industrial enclosures and under-hood automotive locations. |
Pinout & Package
SA150A is housed in a DO-15 axial-leaded package with cathode indicated by a color band. The device has two terminals: anode and cathode - configured for unidirectional clamping from cathode to anode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Surge return path / low-side reference | Connected to ground or low-potential node; completes clamping loop when cathode sees overvoltage. |
| Cathode | Protected line input / high-side connection | Connected to the 150 V rail being protected; conducts avalanche current to anode during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under humidity and thermal cycling stress. |
| 500 W peak pulse rating (10/1000 μs) | Validated for IEC 61000-4-5 Level 4 surge immunity (4 kV line-to-ground) in properly filtered 150 V systems. |
| Clamping voltage ≤243 V at 20.6 A | Provides ≥60 V safety margin below typical 300 V-rated electrolytic capacitors and MOSFET drain-source ratings. |
| Response time <1.0 ps | Enables sub-nanosecond reaction to fast-rising ESD and switching transients, minimizing voltage overshoot. |
| Low IR <1.0 μA at VRWM | Prevents measurable loading of high-impedance voltage references or precision monitoring circuits. |
Applications
| Industrial PLC I/O Protection | DC Power Supply Input Stage |
|---|---|
Use Scenario: Protecting 150 V DC analog input modules against induced surges from nearby motor drives or relay switching. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between signal line and ground, clamping transients before they reach ADC front-end. Use Value: Maintains signal integrity by limiting overvoltage to 243 V, preventing latch-up or damage to 200 V-rated op-amps and multiplexers. |
Use Scenario: Safeguarding the input stage of a 150 V switched-mode power supply against line surges and load dump events. IC Role / Device Role / Timing Role: Primary surge suppression element across bulk capacitor input, absorbing energy before upstream fuse or filter chokes. Use Value: Withstands 500 W pulses without degradation, preserving system uptime and eliminating need for redundant protection stages. |
| Telecom Remote Power Feeds | Renewable Energy Charge Controllers |
Use Scenario: Protecting 150 V PoE++-derived remote power feeds in outdoor telecom cabinets exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Standoff-rated TVS connected across feed pair to shunt common-mode transients into chassis ground. Use Value: 150 V VRWM aligns precisely with IEEE 802.3bt Class 8 voltage limits, ensuring no false triggering during normal operation. |
Use Scenario: Clamping voltage spikes on battery-side inputs of solar charge controllers interfacing with 150 V nominal PV strings. IC Role / Device Role / Timing Role: Unidirectional suppressor mounted between PV+ and ground to handle reverse-bias transients during rapid cloud-edge transitions. Use Value: 175 °C max junction temperature supports operation in sealed, passive-cooled enclosures near rooftop PV arrays. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ150A | Same DO-214AC package; identical VRWM (150 V), VBR (167–185 V), VC (243 V), and PPPM (400 W, lower than SA150A's 500 W). | 400 W rating requires higher derating in high-duty-cycle surge environments; otherwise functionally interchangeable in low-frequency surge scenarios. | Select SMAJ150A only if board space constraints favor SMD mounting or if 400 W suffices per IEC 61000-4-5 testing requirements. |
| Vishay 1.5KE150A | DO-201AD package; same VRWM/VBR/VC specs; rated for 1500 W peak pulse power but with larger footprint and higher junction capacitance (120 pF vs. SA150A's ~40 pF). | Higher capacitance may degrade high-speed signal integrity; superior energy handling suits infrequent, high-amplitude surges (e.g., utility grid coupling). | Choose 1.5KE150A when surge energy exceeds 500 W capability and layout allows axial DO-201AD placement with adequate creepage. |
Compared with SMAJ150A and 1.5KE150A, SA150A delivers optimal balance of 500 W surge capacity, low capacitance, and DO-15 compatibility - making it preferred for cost-sensitive, thermally constrained 150 V industrial power protection where PCB real estate and thermal management are prioritized.
Availability
SA150A is available at Aetrix Electronics and suitable for industrial PLC I/O protection, DC power supply input staging, and renewable energy charge controller designs requiring stable component supply and consistent surge performance across production batches.
Supply support for SA150A 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 power semiconductors and analog ICs, acquired by ON Semiconductor in 2016; its legacy TVS portfolio remains widely deployed in industrial and automotive systems.
The SAxxxA series was engineered specifically for robust, low-cost transient suppression in DC power distribution networks - emphasizing tight VBR tolerance, repeatable clamping, and high-temperature survivability in ruggedized equipment.
FAQ
What is the clamping voltage of SA150A at its rated peak pulse current?
The SA150A exhibits a maximum clamping voltage (VC) of 243 V when subjected to its rated peak pulse current of 20.6 A on the standard 10/1000 μs waveform. This value is measured per JEDEC test conditions and guarantees that downstream circuitry sees no more than 243 V during surge events - a critical parameter for selecting compatible 300 V-rated capacitors and MOSFETs in 150 V systems. The SA150A maintains this clamping performance across its full operating temperature range.
Is SA150A unidirectional or bidirectional, and how is polarity identified?
SA150A is a unidirectional transient voltage suppressor, meaning it clamps only when the cathode is positive relative to the anode. Polarity is marked by a color band on the DO-15 package, which denotes the cathode end - consistent with standard diode marking conventions. This configuration makes SA150A suitable for DC rail protection where reverse-voltage transients are not expected, unlike bidirectional variants (e.g., SA150CA) which lack the band and protect both polarities.
What is the maximum junction temperature rating for SA150A?
The SA150A is rated for a maximum operating junction temperature (TJ) of +175 °C, as specified in Fairchild's official datasheet. This high thermal limit enables reliable operation in enclosed industrial environments, under-hood automotive locations, and passive-cooled renewable energy hardware where ambient temperatures may exceed 85 °C. Derating curves confirm usable power dissipation down to −65 °C storage temperature, supporting wide-deployment use cases.
How does SA150A compare to SA150CA in terms of electrical behavior?
SA150A is unidirectional with cathode-band marking and clamps only for positive transients on the cathode; SA150CA is bidirectional, lacks the band, and clamps symmetrically for both polarities. Their VRWM, VBR, and VC values are identical in magnitude, but SA150CA applies those specs in both directions - making it appropriate for AC-coupled or floating signal lines. SA150A offers lower capacitance and tighter leakage in DC applications, while SA150CA introduces no polarity dependency at the cost of slightly higher IR.
Can SA150A be used in place of SA150CA in a bidirectional protection circuit?
No - SA150A cannot substitute for SA150CA in true bidirectional applications because it only provides clamping for one polarity. Using SA150A in a circuit expecting symmetrical protection (e.g., RS-485 data lines or AC sensor inputs) will leave the reverse-polarity transient path unprotected, risking component failure. SA150A must be paired with a second diode or replaced entirely with SA150CA when bidirectional clamping is required - confirmed by Fairchild's application notes and absolute maximum ratings table.
SA150A 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):
- 150V
- Voltage - Breakdown (Min):
- 167V
- Voltage - Clamping (Max) @ Ipp:
- 243V
- Current - Peak Pulse (10/1000µs):
- 2.1A
- 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
SA150A FAQ
1.How can I place an order for SA150A through Aetrix?
Please submit a Request for Quotation (RFQ) for SA150A 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 SA150A reliable?
The price and inventory of SA150A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA150A is usually 5 days.
3.What payment methods are accepted for SA150A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA150A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA150A?
SA150A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA150A 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 SA150A?
For technical support, including SA150A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA150A requirements.
6.How does Aetrix verify that SA150A is sourced from the original manufacturer or authorized distributors?
All SA150A 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 SA150A meets industry standards.
7.What is the process for return or replacement of SA150A?
All SA150A units undergo pre-shipment inspection (PSI). If there is an issue with SA150A, 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 SA150A part is unused and in its original packaging.
Return procedure for SA150A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA150A Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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onsemi
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Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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Diodes Incorporated
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