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NXP Semiconductors SA5211D/01,112
- Part No.:
- SA5211D/01,112
- Manufacturer:
- NXP Semiconductors
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SA5211D/01,112.pdf
- Description:
- IC TRANSIMPEDANCE 1 CIRCUIT 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,183
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Product details
Overview
SA5211D/01,112 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 at 50–400 Mbaud data rates.
For engineers reviewing the SA5211D/01,112 datasheet, SA5211D/01,112 pinout, SA5211D/01,112 application, or SA5211D/01,112 equivalent, this device is selected for low-noise current-to-voltage conversion in photodiode-based systems where wide dynamic range, ECL-compatible differential outputs, and photodiode capacitance desensitization are critical design requirements.
Technical Context
The SA5211D/01,112 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 (up to 65 dB on VCC2) and supports direct interfacing to ECL logic.
Bandwidth is stabilized by dominant-pole design (RIN ≈ 200 Ω, CIN ≈ 4 pF), achieving 180 MHz f3dB while maintaining insensitivity to photodiode capacitance up to 1 pF. Input is current-driven and referenced to GND1; outputs are complementary voltage signals at OUT(+) and OUT(−) with ~17 Ω single-ended output impedance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Differential transresistance | 28 kΩ (typical; enables 2.8 V output swing per 100 µA input current) |
| Bandwidth (−3 dB) | 180 MHz (supports NRZ data rates up to 400 Mbaud with adequate margin) |
| Input noise density | 1.8 pA/√Hz (typical at 10 MHz; sets fundamental sensitivity limit for low-light detection) |
| Supply voltage | 4.5–5.5 V (single 5 V rail; requires local 0.1 µF + 10 µF decoupling per VCC pin) |
| Output configuration | Differential voltage outputs (OUT(+)/OUT(−); 3.3 V quiescent bias with 3.2 VP-P swing capability) |
| Input impedance | 200 Ω (low RIN minimizes noise gain degradation from photodiode capacitance) |
| PSRR (VCC2) | 45–65 dB (DC tested; critical for rejecting supply noise in high-gain optical front-ends) |
Pinout & Package
SA5211D/01,112 is housed in a 14-lead SOIC package (SOT108-1, body width 3.9 mm) with exposed thermal pad not connected internally. Pin functions are validated per Philips Rev. 03 datasheet and bonding diagram (SD00488).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | GND2 | Output-stage ground return; isolated from GND1 to prevent photodiode current coupling into output paths |
| 3, 5 | NC | No-connect pins; must be left unconnected or tied to GND1 only if shielding required (adds input capacitance) |
| 4 | IIN | Current-input node referenced to GND1; connects directly to photodiode cathode |
| 6, 7 | VCC1, VCC2 | Separate supply rails for input and output stages; decouple independently to suppress inter-stage noise coupling |
| 8–11 | GND1 | Photodiode and input-stage ground; requires low-inductance plane connection to minimize noise pickup |
| 12, 14 | OUT(−), OUT(+) | Differential voltage outputs; each has ~17 Ω source impedance; use 33 Ω series resistors for 50 Ω system matching |
Key Features
| Feature | Design Value |
|---|---|
| Photodiode capacitance desensitization | Maintains 180 MHz bandwidth with up to 1 pF external photodiode capacitance due to Miller-effect dominance |
| Differential architecture | Enables >60 dB common-mode rejection and direct interface to ECL receivers without level-shifting circuitry |
| Low input-referred noise | 1.8 pA/√Hz allows detection of sub-nA photocurrents in 200 MHz bandwidth (41 nA RMS integrated noise) |
| High overload threshold | ±60 µA maximum input current before clipping; supports >60 dB electrical dynamic range |
| Stable high-frequency layout | Requires dedicated GND1/GND2 planes and 0.1 µF chip capacitors at each VCC pin to prevent 800 MHz oscillation |
Applications
| Fiber Optic Receiver Front-End | Current-to-Voltage Conversion |
|---|---|
Use Scenario: Recovering analog/digital optical signals from 850 nm LED or laser diode in 50–400 Mbaud links. IC Role / Device Role / Timing Role: Transimpedance preamplifier converting photodiode current to differential voltage with minimal added noise. Use Value: 1.8 pA/√Hz noise and 180 MHz bandwidth enable BER <10⁻⁹ at −31.5 dBm optical input power (850 nm, 200 MHz BW). | Use Scenario: Converting weak sensor currents (e.g., radiation detectors, photomultipliers) into measurable voltage signals. IC Role / Device Role / Timing Role: High-linearity, low-drift current-input amplifier with 2% linearity over ±40 µA input range. Use Value: 28 kΩ transresistance and 200 Ω input resistance provide optimal SNR for picoamp-level current sources with stray capacitance. |
| RF Signal Processing Chain | Single-Ended to Differential Conversion |
Use Scenario: Amplifying and conditioning RF current-mode signals in test equipment or spectrum analyzers. IC Role / Device Role / Timing Role: Wideband gain block with 180 MHz flat response and 23–65 dB PSRR across dual supplies. Use Value: Differential outputs reject supply noise; 180 MHz bandwidth supports IF processing up to L-band frequencies. | Use Scenario: Driving differential ADC inputs or balanced mixers from single-ended current sources. IC Role / Device Role / Timing Role: Current-input, differential-output converter eliminating need for transformer or active balun. Use Value: Inherent common-mode rejection and 3.3 V DC bias simplify interface to 3.3 V logic or RF ICs requiring differential signaling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transimpedance amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA657IDBVR | 1.6 GHz bandwidth, FET input, 4.8 pA/√Hz noise; single-ended output; requires external feedback network | Better for >500 MHz applications but lacks integrated differential output and photodiode-optimized stability | Select OPA657IDBVR when bandwidth >500 MHz is required and board space allows discrete feedback design |
| LMH6629MA/NOPB | 1.5 GHz bandwidth, bipolar input, 2.9 nV/√Hz voltage noise; single-ended output; no built-in transresistance | Suited for voltage-input high-speed amplification; not a drop-in replacement for photodiode current sensing | Choose LMH6629MA/NOPB for ultra-wideband voltage amplification where transimpedance function is implemented externally |
Compared with OPA657IDBVR and LMH6629MA/NOPB, the SA5211D/01,112 delivers purpose-built photodiode interface performance - including integrated 28 kΩ transresistance, differential outputs, and proven stability with 1 pF photodiode capacitance - making it uniquely suited for cost-sensitive, production-ready fiber-optic receiver designs below 400 Mbaud.
Availability
SA5211D/01,112 is available at Aetrix Electronics and suitable for fiber-optic receivers, medical photodetector systems, and RF instrumentation requiring stable component supply, long-term obsolescence management, and traceable sourcing.
Supply support for SA5211D/01,112 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 company formed from the spin-off of Philips Semiconductors in 2006, specializing in secure connectivity solutions for automotive, industrial, and communication markets.
The SA5211D/01,112 belongs to NXP's legacy high-speed analog amplifier portfolio, originally designed for fiber-optic communication infrastructure - emphasizing low-noise current amplification, photodiode capacitance tolerance, and differential ECL compatibility.
FAQ
What is the maximum input current the SA5211D/01,112 can handle before clipping occurs?
The SA5211D/01,112 exhibits output stage clipping at approximately ±65 µA input current under typical conditions, with guaranteed overload threshold of ±60 µA (Test Circuit 8, Procedure 4). This corresponds to a differential output swing of 3.2 VP-P and supports >60 dB electrical dynamic range in a 200 MHz bandwidth. Exceeding ±65 µA risks distortion and degraded linearity.
Does the SA5211D/01,112 require dual power supplies or can it operate from a single 5 V rail?
The SA5211D/01,112 operates from a single 5 V supply but uses two separate VCC pins - VCC1 (pin 6) for the input stage and VCC2 (pin 7) for the output stage. Both pins must be connected to the same 4.5–5.5 V rail, with independent 0.1 µF ceramic + 10 µF tantalum decoupling to ground. This dual-pin architecture improves PSRR and isolates supply noise between stages.
How does the SA5211D/01,112 maintain bandwidth stability with varying photodiode capacitance?
The SA5211D/01,112 achieves photodiode capacitance desensitization through a shunt-series feedback input stage where the Miller effect dominates over external capacitance. With typical CIN = 4 pF and RIN = 200 Ω, it maintains 180 MHz bandwidth even with +1 pF photodiode capacitance - a ≤20% reduction - unlike conventional TIAs where bandwidth drops quadratically with capacitance.
What is the recommended PCB layout practice to prevent oscillation in the SA5211D/01,112?
To prevent 800 MHz oscillation, the SA5211D/01,112 requires strict separation of GND1 (pins 8–11, photodiode input ground) and GND2 (pins 1–2, output ground) via a low-inductance ground-plane stripe connecting both under the SO14 package. Each VCC pin must have a 0.1 µF chip capacitor placed within 2 mm of the pin, and photodiode traces must be kept <2 mm long and adjacent to GND1.
Is the SA5211D/01,112 pin-compatible with newer NXP transimpedance amplifiers like the SA5214?
No, the SA5211D/01,112 is not pin-compatible with the SA5214 or other members of the SA52xx family. The SA5214 is a post-amplifier with different pinout (e.g., TTL output drivers), while the SA5211D/01,112 is a dedicated transimpedance preamplifier. Their functional roles are complementary - SA5211D/01,112 recovers photodiode current; SA5214 conditions its output - and they are designed for cascade use, not substitution.
SA5211D/01,112 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/01,112 FAQ
1.How can I place an order for SA5211D/01,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA5211D/01,112 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/01,112 reliable?
The price and inventory of SA5211D/01,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA5211D/01,112 is usually 5 days.
3.What payment methods are accepted for SA5211D/01,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA5211D/01,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA5211D/01,112?
SA5211D/01,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA5211D/01,112 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/01,112?
For technical support, including SA5211D/01,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA5211D/01,112 requirements.
6.How does Aetrix verify that SA5211D/01,112 is sourced from the original manufacturer or authorized distributors?
All SA5211D/01,112 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/01,112 meets industry standards.
7.What is the process for return or replacement of SA5211D/01,112?
All SA5211D/01,112 units undergo pre-shipment inspection (PSI). If there is an issue with SA5211D/01,112, 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/01,112 part is unused and in its original packaging.
Return procedure for SA5211D/01,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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