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NXP Semiconductors SA5211D,602
- Part No.:
- SA5211D,602
- Manufacturer:
- NXP Semiconductors
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SA5211D,602.pdf
- Description:
- IC TRANSIMPEDANCE 1 CIRCUIT 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,733
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Product details
Overview
SA5211D,602 from NXP Semiconductors (formerly Philips) is a bipolar transimpedance amplifier optimized for fiber-optic receiver front-ends, delivering 28 kΩ differential transresistance, 180 MHz bandwidth, and 1.8 pA/√Hz input-referred noise current - enabling high-sensitivity analog/digital optical signal recovery in 50–500 Mbps systems.
For engineers reviewing the SA5211D,602 datasheet, SA5211D,602 pinout, SA5211D,602 application, or SA5211D,602 equivalent, key selection criteria include differential output swing (3.2 VP-P), low-input-impedance design (200 Ω), dual-supply rail rejection (up to 65 dB on VCC2), and SO14 package thermal resistance (125 °C/W) for stable operation across −40 °C to +85 °C.
Technical Context
The SA5211D,602 employs a shunt-series feedback input stage with a 14.4 kΩ internal feedback resistor, yielding a nominal 28 kΩ differential transresistance. Its fully differential signal path - including A2 gain stage and emitter-follower output buffers - provides high PSRR and ECL-compatible interfacing capability.
Input is current-driven with ground-referenced IIN terminal; outputs are complementary voltage signals at Pins 13 (OUT+) and 14 (OUT−). The architecture desensitizes frequency response to photodiode capacitance variations up to 1 pF, maintaining bandwidth stability without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Transresistance (diff) | 28 kΩ typical - defines output voltage swing per input current (e.g., ±65 µA → 3.2 VP-P) |
| Bandwidth (−3 dB) | 180 MHz at 25 °C - supports NRZ data rates up to 400 Mbaud with adequate margin |
| Noise density | 1.8 pA/√Hz - enables detection of weak photocurrents in low-light fiber links |
| Supply voltage | 4.5–5.5 V - single 5 V rail simplifies power design; VCC1/VCC2 pins allow independent decoupling |
| Input impedance | 200 Ω - low value minimizes gain peaking with photodiode capacitance |
| PSRR (VCC2) | 45–65 dB - suppresses supply noise coupling into differential outputs, critical for SNR integrity |
| Output swing | 3.2 VP-P differential - sufficient headroom for driving 50 Ω transmission lines or ECL inputs |
Pinout & Package
SA5211D,602 is housed in a plastic SO14 (SOT108-1) package, 3.9 mm body width, with exposed thermal pad not present. Pin layout follows standard D-package top view: GND1 (Pins 8–11), GND2 (Pins 1–2, 12), VCC1 (Pin 6), VCC2 (Pin 7), IIN (Pin 4), OUT(+) (Pin 13), OUT(−) (Pin 14); Pins 3 and 5 are NC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IIN (Pin 4) | Current input node | Low-impedance, ground-referenced terminal for photodiode anode or current-source connection |
| OUT(+) (Pin 13) | Differential output positive | Emitter-follower output sourcing/sinking current; requires 33 Ω series termination for 50 Ω system matching |
| OUT(−) (Pin 14) | Differential output negative | Complementary emitter-follower output; used with Pin 13 for balanced signal recovery and common-mode noise rejection |
| VCC1 (Pin 6) | First supply rail | Power for input stage and first gain block; must be decoupled independently with 0.1 µF + 10 µF |
| VCC2 (Pin 7) | Second supply rail | Power for output stage and bias network; higher PSRR (65 dB) makes it preferred for noise-sensitive routing |
| GND1 (Pins 8–11) | Input ground reference | Dedicated low-inductance return path for photodiode and input-stage currents; isolated from GND2 in layout |
| GND2 (Pins 1–2, 12) | Output ground reference | Return path for output-stage and VCC2 currents; separation prevents output-to-input crosstalk |
Key Features
| Feature | Design Value |
|---|---|
| Differential transimpedance | 28 kΩ ensures precise linear conversion of photodiode current to usable voltage swing without external gain-setting resistors |
| Photodiode capacitance desensitization | Stable 180 MHz bandwidth maintained with up to 1 pF source capacitance - eliminates need for manual compensation networks |
| Split ground architecture | GND1/GND2 separation enables clean signal return partitioning, reducing ground bounce-induced oscillation risk near 800 MHz |
| High PSRR on VCC2 | 65 dB rejection at DC allows noisy digital supply rails to power output stage without degrading SNR |
| Single 5 V operation | Eliminates dual-rail complexity while supporting TTL/ECL interface levels via differential output swing |
Applications
| Fiber Optic Receiver Front-End | Current-to-Voltage Conversion |
|---|---|
Use Scenario: Analog/digital 850 nm fiber link receiving 50–500 Mbps NRZ data from PIN photodiode. IC Role / Device Role / Timing Role: Primary transimpedance preamplifier converting photocurrent to differential voltage with minimal added noise. Use Value: 1.8 pA/√Hz noise density and 180 MHz bandwidth enable BER < 10−9 at −30 dBm optical input power. | Use Scenario: Converting output current from radiation sensor or precision current source into measurable voltage. IC Role / Device Role / Timing Role: Low-drift, wideband current-input amplifier with grounded input node for unidirectional or bidirectional current sensing. Use Value: 200 Ω input impedance and 28 kΩ transresistance provide predictable gain scaling without loading the source. |
| RF Signal Processing Chain | Single-Ended to Differential Conversion |
Use Scenario: Intermediate gain block in 100–200 MHz RF instrumentation signal path before ADC sampling. IC Role / Device Role / Timing Role: Wideband, low-noise gain element with high PSRR to preserve dynamic range in mixed-signal environments. Use Value: 65 dB PSRR on VCC2 rejects switching noise from adjacent digital ICs, preserving ENOB in 12-bit+ ADC systems. | Use Scenario: Driving differential-input ADC or RF mixer from single-ended current-output DAC or sensor. IC Role / Device Role / Timing Role: Active balun converting unbalanced current signal into balanced voltage pair with common-mode rejection. Use Value: Matched differential outputs (±3.2 VP-P) and 17 Ω output impedance simplify interface to 50 Ω transmission lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transimpedance amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMH6629MA/NOPB | Higher bandwidth (1.5 GHz), lower noise (0.94 nV/√Hz voltage noise), but voltage-input architecture - no direct current-input capability | Suitable for post-amplification stages after passive TIA; not drop-in for photodiode direct connection | Select LMH6629 only when interfacing with low-impedance voltage sources, not photodiodes |
| ONET4291PA | Integrated limiting amplifier, 3.3 V supply, 2.5 Gbps data rate support, but fixed 50 Ω input impedance and no adjustable transresistance | Optimized for standardized telecom receivers (SONET/SDH); lacks flexibility for custom analog optical links | Choose ONET4291PA for plug-and-play 2.5G systems; retain SA5211D,602 for design-controlled analog front-ends |
Compared with LMH6629MA/NOPB and ONET4291PA, the SA5211D,602 uniquely combines photodiode-current input compatibility, 28 kΩ programmable-equivalent transresistance, and −40 °C to +85 °C industrial temperature range - making it irreplaceable for cost-sensitive, medium-speed fiber receiver designs requiring analog signal integrity control.
Availability
SA5211D,602 is available at Aetrix Electronics and suitable for fiber-optic communication modules, medical laser detection systems, and RF test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SA5211D,602 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
NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications.
The SA5211D,602 belongs to NXP's legacy high-speed analog amplifier portfolio, originally developed by Philips for fiber-optic receiver front-end applications demanding low-noise, wideband current-to-voltage conversion.
FAQ
What is the maximum input current the SA5211D,602 can handle before clipping occurs?
The SA5211D,602 exhibits output stage clipping at approximately ±65 µA input current under typical conditions, delivering a 3.2 VP-P differential output swing. This corresponds to the overload threshold specified as ±60 µA in Table 4 (IIN MAX), validated by linearity testing per Procedure 4 in the datasheet. Exceeding this level risks distortion and degraded BER in optical links.
Does the SA5211D,602 require external feedback components to set transresistance?
No, the SA5211D,602 integrates its 28 kΩ differential transresistance internally via a 14.4 kΩ feedback resistor in the shunt-series input stage. No external feedback components are needed - the device operates as a self-contained transimpedance amplifier. External resistors are only required for output termination (e.g., 33 Ω per leg for 50 Ω systems) and supply decoupling.
Can the SA5211D,602 operate from a single 3.3 V supply?
No, the SA5211D,602 is specified for 4.5–5.5 V operation only. Attempting 3.3 V operation falls outside recommended conditions (Table 3) and will result in insufficient output swing, degraded PSRR, and potential failure to meet 180 MHz bandwidth or 1.8 pA/√Hz noise specifications. It is not rated for 3.3 V use.
How should the split ground pins (GND1 and GND2) be routed on the PCB for optimal performance?
For optimal performance, GND1 (Pins 8–11) and GND2 (Pins 1–2, 12) must be connected via separate low-inductance paths to a common ground plane - ideally using a dedicated ground stripe beneath the SO14 package. This isolates photodiode input return currents (GND1) from output-stage return currents (GND2), preventing oscillation near 800 MHz and maintaining PSRR integrity.
Is the SA5211D,602 pin-compatible with newer NXP transimpedance amplifiers like the SA5212 or SA5213?
No, the SA5211D,602 is not pin-compatible with SA5212 or SA5213. While all belong to the SA52xx family, SA5212 uses SO8 packaging and SA5213 uses TSSOP8 - differing in pin count, layout, and terminal assignment. The SA5211D,602's SO14 footprint and dual-GND/dual-VCC architecture are unique within the series and require dedicated PCB layout.
SA5211D,602 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- Transimpedance
- Number of Circuits:
- 1
- Output Type:
- Differential
- Slew Rate:
- -
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 180 MHz
- Current - Input Bias:
- -
- Voltage - Input Offset:
- -
- Current - Supply:
- 26mA
- Current - Output / Channel:
- 4 mA
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SO
SA5211D,602 FAQ
1.How can I place an order for SA5211D,602 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA5211D,602 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 SA5211D,602 reliable?
The price and inventory of SA5211D,602 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA5211D,602 is usually 5 days.
3.What payment methods are accepted for SA5211D,602?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA5211D,602 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA5211D,602?
SA5211D,602 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA5211D,602 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 SA5211D,602?
For technical support, including SA5211D,602 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA5211D,602 requirements.
6.How does Aetrix verify that SA5211D,602 is sourced from the original manufacturer or authorized distributors?
All SA5211D,602 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 SA5211D,602 meets industry standards.
7.What is the process for return or replacement of SA5211D,602?
All SA5211D,602 units undergo pre-shipment inspection (PSI). If there is an issue with SA5211D,602, 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 SA5211D,602 part is unused and in its original packaging.
Return procedure for SA5211D,602:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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