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onsemi SA48AG
- Part No.:
- SA48AG
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA48AG.pdf
- Description:
- TVS DIODE 48VWM 77.4VC AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:9,697
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Product details
Overview
SA48AG from onsemi is a unidirectional MiniMOSORB Zener transient voltage suppressor (TVS) designed for clamping high-energy transients in DC power lines and signal paths. It features a 48 V working peak reverse voltage (VRWM), 500 W peak pulse power rating at 1.0 ms, clamping voltage of 77.4 V at 6.5 A peak pulse current, <1.0 ns response time, and UL 497B recognition for isolated loop circuit protection.
For engineers reviewing the SA48AG datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM matching system operating voltage, clamping voltage margin relative to protected IC absolute maximum ratings, surge current capability under IEC 61000-4-5 waveforms, and axial leaded Surmetic package compatibility with through-hole PCB assembly and thermal derating constraints.
Technical Context
The SA48AG operates as a voltage-clamping device that remains high-impedance below VRWM = 48 V and rapidly transitions to low-impedance conduction above its breakdown voltage (VBR = 53.3–56.1 V at IT = 1 mA) to divert transient energy. Its Zener-based structure provides precise, repeatable clamping with low dynamic impedance and minimal leakage (<1 µA @ 48 V).
It is rated for 500 W nonrepetitive peak pulse power per 1.0 ms waveform (Figure 4), with thermal derating to 3.0 W steady-state power at TL ≤ 25°C and junction-to-lead thermal resistance of 33.3°C/W. The device meets Class 3 ESD immunity (>16 kV HBM) and is UL 497B recognized for isolated loop protection - a requirement for telecom and industrial interface circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 48 V - Maximum continuous reverse operating voltage before clamping begins; must exceed system DC bias or peak AC voltage. |
| VBR @ IT = 1 mA | 53.3–56.1 V - Breakdown voltage range defining turn-on threshold; ensures reliable triggering without premature conduction. |
| VC @ IPP = 6.5 A | 77.4 V - Clamping voltage during 1.0 ms transient; determines maximum stress imposed on downstream components. |
| PPK | 500 W @ 1.0 ms - Peak surge energy handling capacity; validates robustness against IEC 61000-4-5 Level 4 surges. |
| Response Time | <1.0 ns - Enables suppression of fast-rising ESD and lightning-induced transients before sensitive circuitry is damaged. |
| Leakage Current | <1 µA @ 48 V - Negligible standby power loss and no measurable loading on 48 V supply rails. |
| UL Recognition | UL 497B (QVGQ2, File #E210057) - Certified for use in isolated loop protection circuits per safety standard. |
Pinout & Package
SA48AG is housed in an axial-leaded Surmetic plastic package (Case 59AA), with cathode identified by a polarity band. Leads are tin-plated copper, solderable at 260°C for 10 seconds at 1/16 inch from case. Mounting position is unrestricted.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; defines clamping reference point for unidirectional operation. |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., 48 V rail or RS-485 bus); conducts surge current to ground when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional Zener clamping | Enables precise overvoltage protection on positive DC rails without affecting reverse-bias integrity. |
| 500 W peak pulse power | Withstands 1.0 ms surges up to 6.5 A - sufficient for IEC 61000-4-5 combination wave (10/700 µs) testing. |
| UL 497B certification | Validates suitability for telecom and industrial isolated interfaces where safety agency approval is mandatory. |
| <1.0 ns response time | Prevents nanosecond-scale ESD events from propagating past the device into microcontrollers or PHYs. |
| Pb-free Surmetic axial package | RoHS-compliant, void-free molded construction with corrosion-resistant leads and proven long-term reliability. |
Applications
| Industrial Power Supply Input Protection | RS-485/422 Data Line Protection |
|---|---|
|
Use Scenario: 48 V DC input stage of programmable logic controller (PLC) power module exposed to load dump and inductive switching transients. IC Role / Device Role / Timing Role: Primary clamping element placed directly across input terminals to limit voltage excursion during 500 W surge events. Use Value: Limits transient voltage to ≤77.4 V, protecting upstream rectifier diodes and downstream DC-DC controllers rated for 80 V max input. |
Use Scenario: Termination point of long-haul RS-485 bus in factory automation, subject to ESD and cable discharge events. IC Role / Device Role / Timing Role: Unidirectional TVS on A/B differential lines referenced to local ground, suppressing common-mode surges. Use Value: Clamps fast transients within 1 ns while adding <1 pF capacitance - preserving signal integrity up to 20 Mbps. |
| Medical Equipment Isolated Interface | Telecom Central Office Line Card |
|
Use Scenario: Signal isolation barrier in patient-monitoring device using optocouplers or digital isolators powered from 48 V backup supply. IC Role / Device Role / Timing Role: UL 497B-certified protector on isolated 48 V side to meet IEC 60601-1 creepage/clearance and surge requirements. Use Value: Provides certified transient immunity without requiring additional isolation barriers or redesign of safety spacing. |
Use Scenario: Tip/ring protection on POTS line cards in central office switches handling multiple subscriber loops. IC Role / Device Role / Timing Role: Primary surge suppressor on each line pair, coordinated with gas discharge tubes for multi-stage protection. Use Value: Handles first-strike energy (500 W) while maintaining low clamping to protect SLIC and codec ICs rated for 85 V absolute max. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ48A | Surface-mount SMA package (vs. axial); same VRWM = 48 V, but lower PPK = 400 W and higher VC = 77.4 V @ 5.1 A. | Requires rework of PCB layout; better suited for space-constrained consumer electronics vs. industrial through-hole designs. | Select SMAJ48A only if board area is constrained and 400 W surge rating suffices for target threat level. |
| P6KE48CA | Bi-directional configuration; identical VRWM = 48 V and PPK = 500 W, but clamps both polarities (VC = 77.4 V @ ±6.5 A). | Applicable where AC-coupled or bidirectional signal lines require symmetrical protection (e.g., Ethernet PHYs). | Choose P6KE48CA only when bidirectional clamping is required; SA48AG is preferred for dedicated +48 V rail protection. |
Compared with SMAJ48A and P6KE48CA, SA48AG offers axial-leaded mechanical robustness for high-vibration environments, full 500 W surge rating in a UL 497B-recognized package, and optimized unidirectional performance for DC power rail protection - making it the default choice for industrial 48 V systems requiring regulatory compliance and field reliability.
Availability
SA48AG is available at Aetrix Electronics and suitable for industrial power supplies, RS-485 communication interfaces, and medical isolated power modules requiring stable component supply, long-lifecycle support, and UL-certified surge protection.
Supply support for SA48AG 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and IoT applications.
The SA5.0A Series - including SA48AG - was engineered specifically for high-reliability transient suppression in industrial control, telecom infrastructure, and medical equipment where UL 497B certification, 500 W surge capability, and axial-leaded ruggedness are critical design requirements.
FAQ
What is the working peak reverse voltage (VRWM) of SA48AG?
The SA48AG has a working peak reverse voltage (VRWM) of 48 V. This means it remains non-conductive under normal 48 V DC operation and begins clamping only when transient voltages exceed its breakdown range (53.3–56.1 V). Designers must ensure system operating voltage stays at or below this value to prevent leakage or premature conduction. The VRWM is confirmed in the Electrical Characteristics table on page 3 of the SA5.0A/D datasheet.
Does SA48AG have UL recognition, and for what standard?
Yes, SA48AG carries UL 497B recognition (File #E210057, Category QVGQ2) for isolated loop circuit protection. This certification covers surge endurance, dielectric withstand, and flammability testing - validating its use in telecom and industrial interfaces where safety agency approval is mandatory. UL 497B applies to the full SA5.0A–SA170A series, including SA48AG, as stated on page 5 of the datasheet.
What is the clamping voltage of SA48AG at its rated peak pulse current?
The SA48AG clamps to a maximum of 77.4 V at its rated peak pulse current of 6.5 A (1.0 ms waveform). This value defines the upper voltage limit imposed on protected circuitry during surge events. It is measured per Figure 4's standardized pulse and is critical for ensuring downstream components - such as DC-DC controllers rated for 80 V max input - remain within safe operating limits. This parameter is specified in the Electrical Characteristics table on page 3.
Is SA48AG RoHS compliant and lead-free?
Yes, SA48AG is Pb-free and RoHS compliant. The "G" suffix in the part number explicitly denotes a lead-free Surmetic axial package, as defined in the Ordering Information section on page 1 of the SA5.0A/D datasheet. Lead plating is tin-based, and the device meets JEDEC standards for solderability at 260°C for 10 seconds at 1/16 inch from the case.
How does SA48AG differ from bidirectional TVS diodes like P6KE48CA?
SA48AG is unidirectional and protects only positive-going transients on a DC line referenced to ground, whereas P6KE48CA clamps both polarities. SA48AG offers tighter leakage (<1 µA @ 48 V) and is UL 497B certified for isolated loop use - a distinction not shared by most bidirectional alternatives. Its axial package also provides superior mechanical retention in high-vibration industrial environments compared to DO-15 or DO-201 packages.
SA48AG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- MiniMosorb™
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 48V
- Voltage - Breakdown (Min):
- 53.3V
- Voltage - Clamping (Max) @ Ipp:
- 77.4V
- Current - Peak Pulse (10/1000µs):
- 6.5A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- Axial
SA48AG FAQ
1.How can I place an order for SA48AG through Aetrix?
Please submit a Request for Quotation (RFQ) for SA48AG 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 SA48AG reliable?
The price and inventory of SA48AG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA48AG is usually 5 days.
3.What payment methods are accepted for SA48AG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA48AG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA48AG?
SA48AG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA48AG 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 SA48AG?
For technical support, including SA48AG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA48AG requirements.
6.How does Aetrix verify that SA48AG is sourced from the original manufacturer or authorized distributors?
All SA48AG 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 SA48AG meets industry standards.
7.What is the process for return or replacement of SA48AG?
All SA48AG units undergo pre-shipment inspection (PSI). If there is an issue with SA48AG, 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 SA48AG part is unused and in its original packaging.
Return procedure for SA48AG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA48AG 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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Diodes Incorporated
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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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D5V0L1B2WS-7
Diodes Incorporated
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