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onsemi SA30CA
- Part No.:
- SA30CA
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA30CA.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO15
- Quantity:
- Payment:
- Shipping:
Inventory:2,577
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Product details
Overview
SA30CA from Fairchild Semiconductor is a bidirectional 500 W transient voltage suppressor (TVS) diode in DO-15 package, designed for clamping ESD and surge transients in power and signal lines. It features a 30 V reverse stand-off voltage (VRWM), 33.3–36.8 V breakdown voltage (VBR), 48.4 V clamping voltage at 10.3 A peak pulse current, and operates up to +175 °C junction temperature.
For engineers reviewing the SA30CA datasheet, pinout, applications, or equivalent options, this device is selected for robust overvoltage protection in DC power rails, industrial I/O interfaces, and automotive body electronics where fast response (<5 ns), low leakage (<1 µA at 30 V), and high surge capability are required.
Technical Context
The SA30CA is a bidirectional TVS diode with symmetrical clamping behavior in both polarities, enabling protection of AC-coupled or floating signal paths without polarity constraints. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance.
It delivers 500 W peak pulse power on the standardized 10/1000 µs waveform, with clamping performance validated at 10.3 A IPPM and thermal operation rated to TJ = +175 °C - making it suitable for harsh-environment surge immunity per IEC 61000-4-5 Level 3–4.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (10/1000 µs) | 500 W - sustains single high-energy surges typical of lightning-induced transients or inductive switching events |
| Reverse Stand-off Voltage (VRWM) | 30 V - maximum continuous operating voltage before significant leakage; sets system operating margin |
| Breakdown Voltage (VBR) | 33.3–36.8 V at 1.0 mA - defines onset of avalanche conduction; tight tolerance enables predictable clamping threshold |
| Clamping Voltage (VC) | 48.4 V at 10.3 A IPPM - limits protected circuit voltage during surge; critical for IC-level ESD/surge survivability |
| Peak Pulse Current (IPPM) | 10.3 A - quantifies maximum surge current the device can safely divert without degradation |
| Reverse Leakage (IR) | <1 µA at VRWM = 30 V - ensures minimal standby power loss and no interference with sensitive analog or logic inputs |
| Junction Temperature Range | +175 °C max - supports operation in under-hood automotive, industrial motor drives, and enclosed power supplies |
Pinout & Package
SA30CA is housed in a DO-15 axial-leaded package with no cathode band - consistent with bidirectional construction. Leads are tinned and suitable for wave or hand soldering; 0.375" lead length used for thermal derating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Surge current path (bidirectional) | No polarity marking; either lead may connect to line or ground - simplifies PCB layout for AC or floating nodes |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures long-term stability of VBR and low parameter drift across temperature and life cycles |
| Fast response time | <5 ns turn-on for bidirectional operation - intercepts fast-rising transients before downstream IC damage occurs |
| Low incremental surge resistance | Minimizes VC overshoot during high di/dt events, improving clamping precision under real-world surge conditions |
| 500 W peak pulse rating | Meets IEC 61000-4-5 (10/1000 µs) Level 4 requirements for industrial equipment and automotive subsystems |
| DO-15 mechanical compatibility | Enables drop-in replacement with legacy 1N62xx and P6SMB series devices using standard axial footprint |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of 24 V DC power inputs against load dump and alternator ripple surges. IC Role / Device Role / Timing Role: Primary clamping element placed upstream of DC-DC converters and microcontroller power rails. Use Value: Clamps transients to ≤48.4 V while handling 10.3 A pulses - preventing brownout resets and MOSFET gate oxide failure. |
Use Scenario: Surge suppression on LIN bus and sensor supply lines exposed to battery transients. IC Role / Device Role / Timing Role: Bidirectional shunt protector for floating, non-polarized communication and sensing circuits. Use Value: Symmetrical clamping eliminates need for dual unidirectional devices; <5 ns response prevents data corruption during ISO 7637-2 pulse 5a/b events. |
| AC-DC Adapter Outputs | Programmable Logic Controller I/O |
Use Scenario: Secondary-side overvoltage protection on 12–36 V SMPS outputs feeding external peripherals. IC Role / Device Role / Timing Role: Final-stage transient clamp after output filter, guarding against capacitor discharge or feedback loop faults. Use Value: 30 V VRWM aligns with common adapter output tolerances; 1 µA leakage avoids regulation error in precision feedback networks. |
Use Scenario: Input/output channel protection in modular PLC backplanes subjected to field-wiring ESD and inductive kickback. IC Role / Device Role / Timing Role: Board-level surge absorber mounted at connector interface, before signal conditioning and isolation stages. Use Value: 500 W rating handles repetitive 1 kV/500 A surges per IEC 61000-4-4; DO-15 form factor allows manual repair and high-voltage creepage spacing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ30CA (onsemi) | Same DO-214AC package; 30 V VRWM, 48.4 V VC @ 10.3 A, but rated for 400 W (10/1000 µs) | Limited to lower-energy surges; not certified for IEC 61000-4-5 Level 4 | Select when board space is constrained and 400 W rating suffices; verify thermal margin in high-ambient designs |
| P6SMB33CA (Littelfuse) | DO-214AA package; 33 V VRWM, 53.3 V VC @ 9.4 A, 600 W rating; tighter VBR tolerance (±5%) | Higher clamping voltage increases risk of downstream IC stress; requires PCB rework for SMC footprint | Choose for higher surge margin where 53.3 V clamping is acceptable and SMC layout exists |
Compared with SMAJ30CA and P6SMB33CA, the SA30CA offers optimal balance of 500 W surge capacity, 48.4 V clamping, and DO-15 through-hole reliability - making it preferred for legacy industrial designs requiring proven thermal robustness and serviceability.
Availability
SA30CA is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, AC-DC adapter outputs, and programmable logic controller I/O requiring stable component supply and long-lifecycle support.
Supply support for SA30CA 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 and supported.
The SAxxCA series was engineered specifically for high-reliability transient suppression in automotive, industrial, and telecom infrastructure - emphasizing rugged packaging, repeatable clamping, and extended temperature operation.
FAQ
What is the clamping voltage of the SA30CA at its rated peak pulse current?
The SA30CA has a maximum clamping voltage (VC) of 48.4 V when subjected to its rated peak pulse current (IPPM) of 10.3 A on the 10/1000 µs waveform. This value is measured per JEDEC standards and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream ICs remain within absolute maximum ratings. The SA30CA maintains this clamping performance across its full operating temperature range.
Is the SA30CA unidirectional or bidirectional, and how does that affect its circuit placement?
The SA30CA is a bidirectional TVS diode, indicated by the "CA" suffix, meaning it provides symmetrical clamping in both forward and reverse directions. This eliminates polarity concerns during placement - either lead may connect to line or ground - and makes it ideal for protecting AC-coupled signals, floating sensors, or differential buses like LIN or RS-485. Unlike unidirectional variants (e.g., SA30A), the SA30CA requires no cathode band identification on the DO-15 package.
What is the maximum junction temperature rating for the SA30CA, and why does it matter in thermal design?
The SA30CA is rated for a maximum operating junction temperature (TJ) of +175 °C. This high rating enables reliable operation in thermally demanding environments such as engine compartments, enclosed power supplies, and industrial motor drive cabinets. When designing heatsinking or airflow, engineers must ensure the actual TJ - calculated from ambient temperature, power dissipation, and thermal resistance - stays below this limit to prevent parametric shift or premature failure during repeated surge events.
How does the SA30CA's 500 W peak pulse power compare to similar DO-15 TVS diodes?
The SA30CA's 500 W rating on the 10/1000 µs waveform places it among the highest-rated DO-15 packaged TVS diodes available - exceeding common alternatives like the P4KE33CA (330 W) and matching the capability of legacy 1.5KE33CA devices. This enables compliance with stringent surge immunity standards including IEC 61000-4-5 Level 4 (4 kV/2 Ω), especially when combined with its low clamping voltage and fast response time - all within a cost-effective through-hole package.
Can the SA30CA be used as a direct replacement for older 1N6277A or 1.5KE33A devices?
The SA30CA is a functional and mechanical alternative to 1N6277A (33 V, 500 W, DO-15) and 1.5KE33A (33 V, 1500 W, DO-201), though not identical. It matches the DO-15 footprint and 30 V VRWM closely with 1N6277A, but offers tighter VBR tolerance and lower clamping voltage (48.4 V vs. ~53 V). For 1.5KE33A, the SA30CA provides comparable clamping but at lower peak power - verify system-level surge energy before substitution in high-power applications.
SA30CA 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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 30V
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 48.4V
- Current - Peak Pulse (10/1000µs):
- 10.3A
- 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
SA30CA FAQ
1.How can I place an order for SA30CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SA30CA 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 SA30CA reliable?
The price and inventory of SA30CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA30CA is usually 5 days.
3.What payment methods are accepted for SA30CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA30CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA30CA?
SA30CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA30CA 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 SA30CA?
For technical support, including SA30CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA30CA requirements.
6.How does Aetrix verify that SA30CA is sourced from the original manufacturer or authorized distributors?
All SA30CA 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 SA30CA meets industry standards.
7.What is the process for return or replacement of SA30CA?
All SA30CA units undergo pre-shipment inspection (PSI). If there is an issue with SA30CA, 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 SA30CA part is unused and in its original packaging.
Return procedure for SA30CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA30CA Tags
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ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
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