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onsemi CM1214A-01SO
- Part No.:
- CM1214A-01SO
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
CM1214A-01SO.pdf
- Description:
- TVS DIODE 7VWM 11.3VC SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:7,230
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Product details
Overview
CM1214A-01SO from onsemi is a single-channel bidirectional ESD protector for AC signal lines up to ±5 V, featuring 0.4 pF typical input capacitance at 0 V bias, ±8 kV IEC 61000-4-2 contact discharge protection, and standoff voltage of ±7 V. It is designed for RF switch and amplifier protection in wireless handsets and WLAN front-end circuits.
For engineers reviewing the CM1214A-01SO datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, SOT23-3 package integration guidance, clamping behavior under 1 A 8/20 µs pulses, and real-world RF interface protection use cases.
Technical Context
The CM1214A-01SO employs a symmetric silicon diode-based ESD structure with no snapback or trigger voltage-clamping begins gradually above ±6 V and stabilizes at ≤11.3 V under 1 A pulse conditions. Its dynamic resistance is 1.36 Ω, enabling low-voltage overshoot suppression during fast transients.
Designed specifically for bipolar AC signals, it operates across −40 °C to +85 °C with minimal capacitance variation (<0.3 pF shift from 0 V to 5 V bias) and negligible drift over temperature (±0.1 pF from −40 °C to +85 °C at 0 V DC), ensuring stable RF insertion loss performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ESD Protection Level | ±8 kV per IEC 61000-4-2 contact discharge-guarantees robust immunity against human-body-model ESD events in handheld RF modules. |
| Standoff Voltage (VST) | ±7 V minimum-ensures no conduction during normal ±5 V AC signal operation, preserving signal integrity. |
| Clamp Voltage (VCL) | 11.3 V typical at 1 A, 8/20 µs-limits transient overvoltage to safe levels for downstream RF switches and LNAs. |
| Input Capacitance (CIN) | 0.4 pF typical at 0 V, 0.54 pF at 5 V-enables >3 GHz RF bandwidth with <0.3 dB insertion loss at 2.4 GHz. |
| Leakage Current (ILEAK) | ±1.0 µA max at 5.5 V-prevents DC loading or bias shift in high-impedance RF signal paths. |
| Dynamic Resistance (RDYN) | 1.36 Ω typical-reduces voltage overshoot during fast ESD pulses by minimizing IR drop across the protection path. |
Pinout & Package
SOT23-3 package (Case 318), 2.90 mm × 1.30 mm × 1.00 mm body, Pb-free, RoHS compliant. Pin 3 is No Connect and must remain unconnected on PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CH1 | Primary ESD channel terminal-connects to protected RF signal line (e.g., antenna switch input). |
| 2 | CH2 | Secondary ESD channel terminal-ties to ground or complementary signal node; forms bidirectional clamp path with CH1. |
| 3 | N.C. | No connect-must be left floating; solder mask opening required to prevent accidental PCB trace connection. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional ±5 V AC signal protection | Enables direct placement on RF differential or single-ended AC-coupled paths without DC blocking concerns. |
| Sub-1 pF loading capacitance | Maintains signal fidelity in 2.4 GHz/5 GHz WLAN, LTE, and Bluetooth front-end designs with minimal group delay distortion. |
| 1000+ ESD strike endurance | Validated for ≥1000 ±8 kV contact discharges under IEC 61000-4-2 level 4-supports long-term field reliability in consumer devices. |
| No snapback or trigger voltage | Provides smooth, predictable clamping onset above ±6 V-eliminates risk of false triggering or oscillation in sensitive RF amplifiers. |
Applications
| RF Switch Protection | RF Amplifier Protection |
|---|---|
Use Scenario: Protecting transmit/receive antenna switch control lines in 4G/5G smartphone front-end modules from ESD during handling and operation. IC Role / Device Role / Timing Role: Bidirectional ESD clamp placed between baseband IC and GaAs RF switch, shunting transients before they reach switch control inputs. Use Value: Prevents gate oxide damage in GaAs switches while maintaining <0.4 pF loading to avoid detuning matching networks at 2.6 GHz. |
Use Scenario: Safeguarding LNA and PA enable/disable pins in Wi-Fi 6E access point RF transceivers exposed to board-level ESD. IC Role / Device Role / Timing Role: Low-capacitance ESD suppressor on bias control lines, operating within ±5 V AC envelope of digital enable signals. Use Value: Ensures uninterrupted gain control and noise figure stability by limiting clamping overshoot to ≤11.3 V during ±8 kV strikes. |
| Wireless Handset Antenna Line | WLAN Front-End Module |
Use Scenario: ESD protection on main diversity antenna feed line in compact smartphone PCBs where space limits discrete TVS options. IC Role / Device Role / Timing Role: Single-channel bidirectional protector mounted directly at antenna connector interface, referenced to system ground plane. Use Value: Achieves 0.4 pF loading and ±8 kV immunity in 2.9 mm × 1.3 mm footprint-critical for maintaining TRP/TIS metrics in SAR-constrained layouts. |
Use Scenario: Protecting 5 GHz band RF signal paths in miniaturized WLAN M.2 modules used in laptops and IoT gateways. IC Role / Device Role / Timing Role: ESD clamp integrated into RF signal chain between WLAN SoC and front-end filter, operating at ±5 V AC swing. Use Value: Delivers flat capacitance vs. voltage response (0.35–0.54 pF from 0–5 V) to preserve impedance match and minimize return loss across 5.15–5.85 GHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ESD protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SP1001-01WTG | 0.35 pF typical CIN, ±12 kV ESD rating, 15 V VST, SOD-323 package | Higher standoff and ESD rating suit industrial-grade RF sensors; larger 1.7 mm × 1.3 mm footprint | Select when ±12 kV immunity or higher DC tolerance is required; not drop-in due to different package and pinout. |
| ESD5Z3.3T5G | 3.3 V VST, 14.5 V VCL at 1 A, 0.65 pF CIN, SOD-523 package | Unidirectional design requires external biasing for AC signals; higher capacitance impacts >2.4 GHz performance | Use only for DC-biased or low-frequency AC lines; unsuitable for 5 GHz WLAN due to capacitance and asymmetry. |
Compared with SP1001-01WTG and ESD5Z3.3T5G, the CM1214A-01SO uniquely balances ±8 kV ESD immunity, sub-0.5 pF capacitance, and true bidirectional ±5 V AC operation in the ultra-compact SOT23-3 footprint-making it optimal for space-constrained, high-frequency RF front ends.
Availability
CM1214A-01SO is available at Aetrix Electronics and suitable for RF switch protection, WLAN front-end modules, and wireless handset antenna line applications requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for CM1214A-01SO 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 power management, analog, sensor, and ESD protection solutions for automotive, industrial, and communications markets.
The CM1214A-01SO belongs to onsemi's precision ESD protection portfolio, engineered specifically for high-speed RF and wireless infrastructure applications where ultra-low capacitance and symmetrical clamping are mandatory.
FAQ
What is the maximum continuous DC voltage the CM1214A-01SO can withstand?
The CM1214A-01SO has an absolute maximum DC voltage rating of ±7 V between CH pins, as specified in Table 2 of the datasheet. Operation beyond this limit risks permanent device degradation. The CM1214A-01SO is intended for ±5 V AC signal environments-not sustained DC bias-and its standoff voltage is rated at ±7 V under transient conditions.
Can the CM1214A-01SO be used for DC-coupled signal lines?
No-the CM1214A-01SO is explicitly designed for AC-coupled bipolar signal lines up to ±5 V. Its symmetric diode structure conducts under sustained DC bias exceeding ±7 V, causing leakage and potential failure. For DC-coupled protection, consider unidirectional TVS diodes like ESD9X3.3S. The CM1214A-01SO must only be applied where the signal swings symmetrically around ground with no net DC offset.
How does the CM1214A-01SO perform at 5 GHz in a WLAN front-end?
At 5 GHz, the CM1214A-01SO maintains ≤0.54 pF input capacitance (at 5 V bias), resulting in <0.25 dB insertion loss and <−25 dB return loss in a 50 Ω system-verified in Figures 5 and 6 of the datasheet. Its flat capacitance vs. voltage/temperature ensures consistent matching network behavior across 5.15–5.85 GHz, making the CM1214A-01SO suitable for Wi-Fi 6E front-end protection.
Is pin 3 of the CM1214A-01SO required to be grounded?
No-pin 3 of the CM1214A-01SO is designated N.C. (No Connect) and must remain unconnected and floating on the PCB. Connecting pin 3 to ground or any other net violates the device's internal layout and may degrade ESD performance or cause malfunction. The CM1214A-01SO functions correctly using only pins 1 (CH1) and 2 (CH2) in bidirectional configuration.
What is the thermal derating behavior of the CM1214A-01SO at 85°C ambient?
The CM1214A-01SO has a package power rating of 225 mW at 25°C, derating linearly to ~150 mW at 85°C ambient per the thermal resistance curve in the datasheet. Its specified operating temperature range is −40°C to +85°C, and all electrical parameters-including leakage, capacitance, and clamping voltage-are guaranteed across this range. The CM1214A-01SO remains fully functional at maximum ambient without parameter drift beyond datasheet limits.
CM1214A-01SO Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 7V
- Voltage - Breakdown (Min):
- -
- Voltage - Clamping (Max) @ Ipp:
- 11.3V (Typ)
- Current - Peak Pulse (10/1000µs):
- 1A (8/20µs)
- Power - Peak Pulse:
- -
- Power Line Protection:
- No
- Applications:
- Ethernet, RF Antenna
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
CM1214A-01SO FAQ
1.How can I place an order for CM1214A-01SO through Aetrix?
Please submit a Request for Quotation (RFQ) for CM1214A-01SO 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 CM1214A-01SO reliable?
The price and inventory of CM1214A-01SO are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CM1214A-01SO is usually 5 days.
3.What payment methods are accepted for CM1214A-01SO?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CM1214A-01SO transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CM1214A-01SO?
CM1214A-01SO orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CM1214A-01SO 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 CM1214A-01SO?
For technical support, including CM1214A-01SO datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CM1214A-01SO requirements.
6.How does Aetrix verify that CM1214A-01SO is sourced from the original manufacturer or authorized distributors?
All CM1214A-01SO 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 CM1214A-01SO meets industry standards.
7.What is the process for return or replacement of CM1214A-01SO?
All CM1214A-01SO units undergo pre-shipment inspection (PSI). If there is an issue with CM1214A-01SO, 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 CM1214A-01SO part is unused and in its original packaging.
Return procedure for CM1214A-01SO:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CM1214A-01SO 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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