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onsemi SD12CT1G
- Part No.:
- SD12CT1G
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
SD12CT1G.pdf
- Description:
- TVS DIODE 12VWM 19VC SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:180,232
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Product details
Overview
SD12CT1G from onsemi is a bi-directional ESD protection diode designed for I/O line protection in portable electronics, featuring 12 V working peak reverse voltage (VRWM), 19 V clamping voltage at 5 A (VC), 15 A peak pulse current (IPP), 64 pF capacitance at 0 V, and compliance with IEC61000-4-2 Level 4 (±30 kV air/contact). It is used in cellular phones, digital cameras, and power supplies where board space and low clamping are critical.
For engineers reviewing the SD12CT1G datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM ≥ system operating voltage, VC < IC absolute maximum rating, low Cj for high-speed interfaces, MSL1 reflow compatibility, and SOD-323 footprint constraints in space-constrained layouts.
Technical Context
This device operates as a transient voltage suppression (TVS) diode with symmetrical bi-directional clamping behavior, enabling protection of AC-coupled or differential signal lines without polarity concerns. Its silicon avalanche structure delivers sub-nanosecond response time and stable breakdown at 13.3 V (typical VBR @ 1 mA).
The SOD-323 package supports automated placement and reflow up to 260°C, with thermal resistance RJA = 635°C/W and junction temperature range −65°C to +150°C - suitable for consumer-grade portable environments but not extended industrial or automotive under-hood use.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 12 V - must be ≥ nominal DC bus or signal swing voltage to avoid leakage-induced signal distortion |
| VBR (min) | 13.3 V - ensures reliable conduction onset above normal operating voltage, preventing false triggering |
| VC @ 5 A | 19 V - limits transient voltage seen by downstream ICs to safe levels during ESD events |
| IPP | 15 A - supports full IEC61000-4-2 Level 4 (±30 kV) surge handling with margin |
| Cj @ 0 V | 64 pF - impacts high-speed signal integrity; acceptable for USB 2.0, audio, and low-Mbps data lines |
| IR @ VRWM | 1.0 μA - negligible standby current draw, critical for battery-powered device quiescent power budget |
| Package | SOD-323 (1.70 × 1.25 × 0.85 mm) - enables ultra-compact layout in smartphones and wearables |
Pinout & Package
SOD-323 surface-mount package with two terminals: cathode marked by polarity band (Pin 1), anode (Pin 2). Void-free thermosetting plastic case meets UL 94 V-0; qualified for MSL 1 and 260°C reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Cathode) | Protected Line Terminal (Bi-directional) | Connected to I/O line; forms symmetrical avalanche path with Pin 2 during ±ESD transients |
| Pin 2 (Anode) | Protected Line Terminal (Bi-directional) | Completes bidirectional clamping path; no ground or supply reference required |
Key Features
| Feature | Design Value |
|---|---|
| IEC61000-4-2 Level 4 compliance | Guarantees robustness against ±30 kV air/±30 kV contact ESD per international immunity standard |
| Ultra-low clamping voltage (19 V @ 5 A) | Protects 3.3 V/5 V logic interfaces without exceeding downstream IC absolute maximum ratings |
| Pb-free and RoHS-compliant construction | Meets global environmental regulations and enables lead-free assembly without process deviation |
| MSL 1 moisture sensitivity rating | Allows indefinite floor life before reflow; eliminates baking requirement and reduces manufacturing overhead |
Applications
| USB 2.0 Data Lines | Digital Camera Interface |
|---|---|
Use Scenario: Protecting D+ and D− pins of USB 2.0 transceivers in smartphones and tablets from ESD during cable insertion/removal. IC Role / Device Role: Bi-directional TVS diode placed directly at connector, shunting transients before they reach PHY IC. Use Value: 64 pF capacitance avoids signal integrity degradation at 480 Mbps; 19 V clamping prevents damage to 3.3 V tolerant PHY inputs. | Use Scenario: Safeguarding MIPI CSI-2 clock and data lanes between image sensor and processor in compact digital cameras. IC Role / Device Role: Low-capacitance ESD clamp on high-speed serial interface traces, mounted adjacent to sensor connector. Use Value: Symmetrical clamping handles bidirectional signal swings; SOD-323 footprint fits tight routing near sensor module edge. |
| Portable Power Supply Inputs | Audio Jack ESD Protection |
Use Scenario: Shielding 12 V input rails of PMICs or LDOs in battery-powered medical monitors and handheld test equipment. IC Role / Device Role: Primary overvoltage clamp on unregulated DC input, absorbing load-dump-like transients and human-body ESD. Use Value: 12 V VRWM matches common adapter voltages; 350 W peak power rating sustains short-duration surges without failure. | Use Scenario: Preventing ESD damage to codec inputs/outputs connected to 3.5 mm headphone jacks in Bluetooth earbuds and portable speakers. IC Role / Device Role: Bidirectional protection element across stereo left/right and ground paths, placed at jack PCB footprint. Use Value: Low leakage (1.0 μA) avoids DC bias shift in analog audio paths; small size allows dual-channel protection in <2 mm² area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ESD5Z3.3T5G | Lower VRWM (3.3 V), higher Cj (100 pF), same SOD-323 package | Better suited for 3.3 V logic rails; less appropriate for 12 V lines due to premature conduction | Select only when protecting sub-5 V interfaces where tighter clamping margin is needed |
| TPD2E001DRYR | 2-channel array, lower Cj (11 pF), 5 V VRWM, X2SON package (1.0 × 0.6 mm) | Enables dual-line protection in smaller area; requires redesign for single-line use | Prefer when protecting differential pairs (e.g., USB, HDMI) and board space is more constrained than cost |
Compared with SD12CT1G, ESD5Z3.3T5G offers tighter clamping for low-voltage logic but risks leakage on 12 V rails, while TPD2E001DRYR saves space for multi-line protection but lacks the 12 V VRWM headroom required for power-supply-side ESD defense.
Availability
SD12CT1G is available at Aetrix Electronics and suitable for cellular phones, digital cameras, and portable power supplies requiring stable component supply, consistent Pb-free compliance, and MSL1 reflow readiness.
Supply support for SD12CT1G 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 focused on energy-efficient electronics, delivering discrete, analog, and logic solutions for automotive, industrial, cloud, and portable markets.
The SD12CT1G belongs to onsemi's ESD protection diode product line, engineered specifically for space-constrained, battery-operated devices needing certified IEC-level ESD immunity without compromising signal fidelity.
FAQ
What is the maximum working voltage the SD12CT1G can protect?
The SD12CT1G has a working peak reverse voltage (VRWM) of 12 V, meaning it is rated to continuously block up to 12 V DC or peak AC signals without significant leakage. Operating above this voltage risks excessive IR current and potential thermal runaway. The SD12CT1G must be selected only where system nominal voltage ≤ 12 V, such as 9–12 V power inputs or 3.3/5 V data lines with sufficient margin.
Does the SD12CT1G require a ground connection to function?
No, the SD12CT1G is a bi-directional TVS diode with no dedicated ground terminal; it connects across the protected line and return path (e.g., signal-to-ground or differential pair). Its symmetrical structure enables clamping of both positive and negative transients without referencing a system ground plane - ideal for floating or isolated interfaces where ground routing is impractical.
Can the SD12CT1G be used for USB 3.0 or high-speed HDMI protection?
No, the SD12CT1G is not recommended for USB 3.0 (5 Gbps) or HDMI (up to 18 Gbps) due to its 64 pF capacitance at 0 V, which would severely attenuate high-frequency signals and violate eye diagram requirements. It is validated for USB 2.0 (480 Mbps), audio, and low-Mbps digital interfaces. For higher speeds, consider lower-Cj alternatives like NUP4201MR6T1G (12 pF) or ESD7L5.0DT5G (5.5 pF).
What does the "G" suffix in SD12CT1G signify?
The "G" suffix in SD12CT1G indicates a Pb-free and RoHS-compliant version per onsemi's packaging nomenclature. It confirms the device uses lead-free terminations and halogen-free molding compound, meeting EU Directive 2011/65/EU. This designation also aligns with MSL1 reflow qualification and 260°C peak solder temperature capability - critical for modern lead-free assembly processes.
How does the SD12CT1G compare to standard Zener diodes for ESD protection?
Unlike general-purpose Zener diodes, the SD12CT1G is optimized for fast transient suppression: it achieves sub-nanosecond response, guaranteed clamping performance per IEC61000-4-2, and tightly controlled VBR/VC parameters. Standard Zeners lack ESD-specific qualification, exhibit higher leakage at VRWM, and show inconsistent clamping under 8/20 µs pulses - making the SD12CT1G a purpose-built, tested solution for certified ESD immunity in commercial portable designs.
SD12CT1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- SC-76, SOD-323
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 12V (Max)
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19V
- Current - Peak Pulse (10/1000µs):
- 5A (8/20µs)
- Power - Peak Pulse:
- 350W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- 64pF @ 1MHz
- Operating Temperature:
- -65°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
SD12CT1G FAQ
1.How can I place an order for SD12CT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SD12CT1G 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 SD12CT1G reliable?
The price and inventory of SD12CT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SD12CT1G is usually 5 days.
3.What payment methods are accepted for SD12CT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SD12CT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SD12CT1G?
SD12CT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SD12CT1G 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 SD12CT1G?
For technical support, including SD12CT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SD12CT1G requirements.
6.How does Aetrix verify that SD12CT1G is sourced from the original manufacturer or authorized distributors?
All SD12CT1G 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 SD12CT1G meets industry standards.
7.What is the process for return or replacement of SD12CT1G?
All SD12CT1G units undergo pre-shipment inspection (PSI). If there is an issue with SD12CT1G, 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 SD12CT1G part is unused and in its original packaging.
Return procedure for SD12CT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SD12CT1G Tags
-
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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