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onsemi SZCM1214A-01SO
- Part No.:
- SZCM1214A-01SO
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZCM1214A-01SO.pdf
- Description:
- TVS DIODE 7VWM 11.3VC SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,925
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Product details
Overview
SZCM1214A-01SO from onsemi is a single-channel bidirectional ESD protector for bipolar AC signal lines, rated for ±5 V operation and 0.25 W transmit power. It features sub-1 pF channel capacitance (0.35–0.9 pF), ±8 kV IEC 61000-4-2 contact discharge protection, and standoff voltage of ±7 V - optimized for RF switch and amplifier protection in wireless handsets and WLAN front-end circuits.
For engineers reviewing the SZCM1214A-01SO datasheet, pinout, applications, or equivalent options, key selection criteria include low-capacitance signal integrity preservation, verified 1000+ ESD strike endurance per I/O pin, and SOT23-3 footprint compatibility with high-speed RF PCB layouts.
Technical Context
The SZCM1214A-01SO employs a symmetrical silicon diode-based clamping architecture with no snapback or trigger voltage - it begins gradual conduction near ±6 V and clamps above ±7 V under transient stress. Its dynamic resistance is 1.36 Ω at 1 A (8/20 µs pulse), ensuring low-voltage overshoot during ESD events.
Capacitance remains stable across operating conditions: 0.35–0.9 pF at 1 MHz between CH pins, with minimal variation over −40 °C to +85 °C and 0–5 V bias. All N.C. pins must be left floating; only pins 1 (CH1) and 2 (CH2) form the protected signal path.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ESD Protection Level | ±8 kV per IEC 61000-4-2 contact discharge - meets industrial immunity requirements without external filtering. |
| Standoff Voltage (VST) | ±7 V - ensures signal integrity for ±5 V AC interfaces without leakage or false triggering. |
| Channel Clamp Voltage (VCL) | 11.3 V at 1 A (8/20 µs) - limits transient overvoltage to safe levels for downstream RF ICs. |
| Channel Input Capacitance | 0.35–0.9 pF at 1 MHz - preserves bandwidth and insertion loss in GHz-range RF paths. |
| Leakage Current (ILEAK) | ±0.1 to ±1.0 µA at 5.5 V - negligible loading on low-power analog/RF signal chains. |
| Absolute Max DC Voltage | 7 V between CH pins - defines safe continuous operating margin beyond ±5 V signal swing. |
| Package Power Rating | 225 mW - supports short-duration ESD pulses without thermal failure in SOT23-3. |
Pinout & Package
SZCM1214A-01SO is housed in a Pb-free SOT23-3 package (Case 318), measuring 2.90 × 1.30 × 1.00 mm. Pin 3 is internally unconnected and must remain floating on the PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CH1 | Primary ESD channel input - connects to protected signal line (e.g., RF antenna switch output). |
| 2 | CH2 | Secondary ESD channel terminal - tied to system ground to complete clamping path. |
| 3 | N.C. | No internal connection - must be left unconnected on PCB to avoid parasitic coupling or reliability risk. |
Key Features
| Feature | Design Value |
|---|---|
| Sub-1 pF loading capacitance | Maintains >10 GHz signal fidelity in RF front-end paths without degrading insertion loss or group delay. |
| ±8 kV IEC 61000-4-2 protection | Validated for 1000+ contact discharges - enables long-term reliability in handheld device drop-test environments. |
| Symmetrical VI response | No snapback or polarity asymmetry - ensures consistent clamping for both positive and negative ESD transients. |
| Minimal C-V and C-T variation | Capacitance drift <±0.1 pF from −40 °C to +85 °C and 0–5 V bias - simplifies broadband matching network design. |
| SOT23-3 footprint | Enables direct integration into space-constrained RF modules without redesigning layout or thermal relief. |
Applications
| RF Switch Protection | RF Amplifier Protection |
|---|---|
|
Use Scenario: Protecting transmit/receive signal paths in LTE/Wi-Fi front-end modules where antenna switches route signals between PA and LNA. IC Role / Device Role / Timing Role: Bidirectional ESD clamp placed between switch output and antenna port to suppress ±8 kV transients before they reach sensitive GaAs/GaN switch elements. Use Value: Prevents gate oxide damage and parametric shift in RF switches by limiting clamped voltage to ≤11.3 V while adding <0.9 pF parasitic capacitance. |
Use Scenario: Safeguarding power amplifier (PA) output stages in mobile handset transceivers exposed to handling ESD during assembly or field use. IC Role / Device Role / Timing Role: Low-capacitance shunt protector installed at PA output node to divert ESD energy to ground without attenuating 2.4/5 GHz output power. Use Value: Enables PA operation up to ±5 V signal swing with no degradation in gain flatness or ACLR, validated across temperature and voltage. |
| Wireless Handset Antenna Line | WLAN Front-End Module |
|
Use Scenario: ESD protection on main diversity antenna feedlines in smartphones, where compact size and RF transparency are critical. IC Role / Device Role / Timing Role: Single-channel bipolar protector mounted directly at antenna connector interface to absorb human-body-model (HBM) and IEC 61000-4-2 events. Use Value: Achieves <−0.3 dB insertion loss at 2.45 GHz and withstands 1000+ ESD strikes - extends field-life of antenna tuning components. |
Use Scenario: Protecting 5 GHz WLAN front-end modules integrating T/R switch, PA, and LNA in miniaturized M.2 or PCIe form factors. IC Role / Device Role / Timing Role: Signal-line protector placed between WLAN SoC RFIO pins and module edge connectors to meet FCC/CE radiated immunity requirements. Use Value: Maintains EVM <1.5% at 54 Mbps OFDM due to stable sub-1 pF capacitance and <1.36 Ω dynamic resistance during clamping. |
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 | 0.3 pF typical capacitance; ±12 kV ESD rating; SOD-323 package (larger footprint than SOT23-3) | Better ESD margin but higher parasitic inductance due to larger package - less suitable for >3 GHz RF paths | Prefer when ±12 kV immunity is mandated and layout space allows SOD-323; verify ground inductance impact on clamping speed. |
| TPD2E001DRYR | 0.85 pF max capacitance; ±8 kV rating; same SOT23-3 footprint; integrated 100 Ω series resistor per channel | Includes current-limiting resistor - adds signal attenuation unsuitable for PA/LNA interfaces requiring minimal loss | Select only for baseband or low-frequency analog lines; avoid in RF signal paths where insertion loss must be minimized. |
Compared with SP1001-01WTG and TPD2E001DRYR, the SZCM1214A-01SO delivers optimal balance of ultra-low capacitance, proven RF transparency, and SOT23-3 compatibility - making it the preferred choice for GHz-range antenna switch and amplifier protection where layout density and signal integrity are non-negotiable.
Availability
SZCM1214A-01SO is available at Aetrix Electronics and suitable for RF switch protection, RF amplifier protection, and wireless handset antenna line applications requiring stable component supply, traceable sourcing, and lifecycle continuity.
Supply support for SZCM1214A-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 technologies for automotive, industrial, cloud, and IoT applications.
The CM1214A family was designed specifically for high-speed bipolar AC signal line protection in RF front-end systems - prioritizing sub-1 pF capacitance, symmetrical clamping, and robust multi-strike ESD endurance.
FAQ
What is the maximum continuous voltage the SZCM1214A-01SO can withstand?
The SZCM1214A-01SO has an absolute maximum DC voltage rating of 7 V between CH pins. This defines the upper limit for continuous operation - it is intended for ±5 V AC signal environments, where peak-to-peak swing remains within the 10 V window and standoff voltage (±7 V) provides margin against false triggering during normal operation.
Can pin 3 of the SZCM1214A-01SO be grounded or tied to VCC?
No - pin 3 of the SZCM1214A-01SO is internally unconnected (N.C.) and must be left floating on the PCB. Connecting it to ground, VCC, or any other net may introduce parasitic coupling, degrade RF performance, or compromise ESD reliability. The official application note explicitly requires this pin to remain unconnected.
How many ESD strikes can the SZCM1214A-01SO survive under IEC 61000-4-2 testing?
The SZCM1214A-01SO is rated for over 1000 ±8 kV contact discharge ESD strikes per I/O pin under standard IEC 61000-4-2 Level 4 test conditions - with 1-second intervals and full 1000-pulse continuity. Post-test verification confirms all electrical parameters remain within specification, validating long-term robustness in handheld device deployments.
Does the SZCM1214A-01SO require external biasing or control signals?
No - the SZCM1214A-01SO is a passive, bidirectional ESD protection device with no power supply, enable pin, or control interface. It operates purely through silicon diode clamping behavior and requires only correct placement across the protected signal line (CH1) and ground (CH2); no external circuitry or configuration is needed.
Is the SZCM1214A-01SO RoHS compliant and lead-free?
Yes - the SZCM1214A-01SO is manufactured as a Pb-free device and fully complies with RoHS Directive 2011/65/EU. The "SO" suffix denotes the SOT23-3 Pb-free package, and the datasheet confirms compliance with JEDEC standards and onsemi's environmental policy.
SZCM1214A-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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
SZCM1214A-01SO FAQ
1.How can I place an order for SZCM1214A-01SO through Aetrix?
Please submit a Request for Quotation (RFQ) for SZCM1214A-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 SZCM1214A-01SO reliable?
The price and inventory of SZCM1214A-01SO are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZCM1214A-01SO is usually 5 days.
3.What payment methods are accepted for SZCM1214A-01SO?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZCM1214A-01SO transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZCM1214A-01SO?
SZCM1214A-01SO orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZCM1214A-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 SZCM1214A-01SO?
For technical support, including SZCM1214A-01SO datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZCM1214A-01SO requirements.
6.How does Aetrix verify that SZCM1214A-01SO is sourced from the original manufacturer or authorized distributors?
All SZCM1214A-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 SZCM1214A-01SO meets industry standards.
7.What is the process for return or replacement of SZCM1214A-01SO?
All SZCM1214A-01SO units undergo pre-shipment inspection (PSI). If there is an issue with SZCM1214A-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 SZCM1214A-01SO part is unused and in its original packaging.
Return procedure for SZCM1214A-01SO:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZCM1214A-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
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D5V0L1B2WS-7
Diodes Incorporated
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